SIST ISO 3506:1996
(Main)Corrosion-resistant stainless steel fasteners -- Specifications
Corrosion-resistant stainless steel fasteners -- Specifications
Éléments de fixation en acier inoxydable résistant à la corrosion -- Spécifications
Mehanske lastnosti veznih elementov iz nerjavnih jekel in jekel, odpornih proti kislinam
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International Standard 3506
~
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEKYHAPO~HAR OPTAHil3AUMR no CTAHAAPTH3AUMM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Corrosion-resistant stainless steel fasteners -
Specifications
Eléments de fixation en acier inoxydable résistant à la corrosion - Spécifications
First edition - 1979-05-15
UDC 621.882 : 669.14.018.8 Ref. No. IS0 3506-1979 (E)
Descriptors : fasteners, bolts, screws, studs, nuts (fasteners), specifications, designation, steel products, corrosion resistant steels, stainless
steels, austenitic steels, ferritic steels, martensitic steels, chemical composition, marking, mechanical properties, tests, mechanical tests, tension
tests, torsion tests, test equipment, elongation at rupture.
Price based on 14 pages
---------------------- Page: 1 ----------------------
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up has the right to be represented on that committee. International organizatirms,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 3506 was developed by Technical Committee
2, Fasteners, and was circulated to the member bodies in June 1978.
lSO/TC
It has been approved by the member bodies of the following countries :
Australia Germany, F.R. Poland
Austria Hungary Romania
Belgium India South Africa, Rep. of
Bulgaria Ireland Sweden
Canada Italy Switzerland
Chile Japan
Turkey
Denmark Korea, Rep. of United Kingdom
Mexico
Egypt, Arab Rep. of USA
Finland Netherlands USSR
France Norway
The member body of the following country expressed disapproval of the document
on technical grounds :
New Zealand
Q International Organization for Standardization, 1979 O
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
CONTENTS Page
O Introduction . 1
1 Scope and field of application . 1
2 References . 1
3 Designation. marking. finish and magnetic properties . 2
4 Chemical composition . 5
5 Mechanical properties . 5
6 Methodsoftest . 6
Annexes
A Stainless steel composition specifications
(Extract from IS0 683/Xlll) . 11
r B Stainless steel composition specifications
(Extract from IS0 4954) . 12
C Screw thread . Tensile stress areas . 13
D Total extension at fracture (AL) . 14
...
III
---------------------- Page: 3 ----------------------
*
e
---------------------- Page: 4 ----------------------
IS0 3506-1979 (E)
INTERNATIONAL STANDARD
Corrosion-resistant stainless steel fasteners -
Specifications
O INTRODUCTION - effective thread engagement is at least 0,6 times
nominal diameter.
In the preparation of this International Standard, special
This International Standard does not define corrosion or
attention has been given to the fundamentally different
oxidation resistance in particular environments. It does
property characteristics of the stainless steel fastener grades
specify grades for fasteners made from corrosion-resistant
compared with carbon and low-alloy steel fasteners of
stainless steels. Some have mechanictl properties allowing
similar dimensions. The ferritic and austenitic stainless
use at temperatures down to -200 C in air. Some have
steels are strengthened only by cold working, and conse-
oxidation resistance allowing use at temperatures up to
quently the components do not have as homogeneous a
+ 800 OC in air.
condition as a hardened and tempered part. These special
features have been recognized in the preparation of the
Acceptable corrosion and oxidation performances and
clauses applicable to property classes and the mechanical
mechanical property values allowing use at elevated or sub-
test procedures, which differ from the carbon and low alloy
zero temperatures must be the subject of agreement between
steel fastener test procedures with regard to the measure-
user and manufacturer wherever appropriate to the proposed
ment of yield point (stress at 0,2 % permanent strain) and
sew ice environment.
ductility (total extension at fracture) on the finished
component.
2 REFERENCES
tS0 68, IS0 general purpose screw threads - Basic profile.
ISOIR 79, Brinell hardness test for steel.
1 SCOPE AND FIELD OF APPLICATION
ISOIR 80, Rockwell hardness test (B and Cscales) for steel.
This International Standard gives specifications for bolts,
screws, studs and nuts made from austenitic, ferritic and
ISOIR 8 1, Vickers hardness test for steel.
martensitic grades of corrosion-resistant stainless steels.
IS0 82, Steel - Tensile testing.
It is applicable only to fastener components after com-
ISO262, IS0 general purpose metric screw threads -
pletion of manufacture,
Selected sizes for screws, bolts and nuts.
- with nominal thread diameters from 1,6 up to and
IS0 6831x11 I, Heat-treated steels, alloy steels and free-
including 39 mm,
cutting steels - Part XII1 : Wrought stainless steels.
- of any triangular IS0 metric threads according to
IS0 89811, Mechanical properties of fasteners - Part I :
IS068 and with diameters and pitches according to
Bolts, screws and studs.
IS0 262,
IS0 8981 I I, Mechanical properties of fasteners - Part II :
- of any shape;
Nuts with specified proof load values.
and additionally for nuts of any shape provided that
IS0 3651, Austenitic stainless steels - Determination of
resistance to intergranular corrosion.
- width across flats or outside diameters is not less
than 1,45 times nominal diameter, and IS0 4954, Steels for cold heading and extruding.)
1) At present at the stage of draft. (Revision of ISO/R 898/11-1969 and IS0 898/1\1-1972.)
2) At present at the stage of draft.
1
---------------------- Page: 5 ----------------------
IS0 3506-1979 (E)
of the manufacturer or at the specific request of the pur-
3 DESIGNATION, MARKING, FINISH AND MAGNETIC
chaser. This additional marking should not be liable to
PROPERTIES
cause confusion with any other standardized marking or
identification.
3.1 Designation
The designation of fasteners is given in table 1. The steel
ds and other fasteners
grades and property classes are designated by a fourçharac-
ter identifier consisting of a letter followed by three digits.
Marking of studs and other fasteners shall be agreed between
The letter indicates the general composition groups of steels
user and manufacturer.
as follows :
A for austenitic steels;
3.2.3 Nuts
C for martensitic steels;
Nuts shall be marked with the steel grade and property
F for ferritic steels.
class, if necessary, and with the manufacturer's identi-
fication mark in the case of nuts of M5 nom
The first digit following the letter indicates the type of
diameter and greater (see figure 21, where this is
alloying elements present for the particular group A, C or
possible for the manufacturer. Marking of one nut face is
F. The last two digits indicate the property class (metallur-
acceptable and shall be by indentation only when applied
e
gical condition); for example :
to the bearing surface of the nuts. Alternatively, marking
on the side of the s is permissible. Property class
1) A2-70 indicates :
marking and designati f nuts is necessary where the nuts
austenitic steel, cold-worked, minimum 700 N/mm2*
do not meet the minimum proof load stress of the highest
tensile strength.
property class for the steel grade.
2) C4-70 indicates :
martensitic 12 % Cr steel, hardened and tempered,
3.2.4 Packages and containers
minimum 700 N/mm2 tensile strength.
Marking of the designation is mandatory on all packages
3.2 Marking
or containers of all sizes.
3.2.1 Bolts and screws
3.3 Finish
All hexagon head screws and bolts and socket cap screws
steel fasteners shall be
Unless otherwise specified, stainless
of M5 thread diameter and greater shall be clearly marked
in accordance with the designation system given in 3.1. This
marking can be applied to other types of bolts and screws
where it is technically possible to do so on the head portion
3.4 Magnetic properties
only.
AII austenitic stainless steel fasteners are normally non-
The marking shall include the steel grade and property class
'magnetic; after cold working, some magnetic properties
and also the manufacturer's identification mark (see
may be evident.
figure 1). Additional marking can be applied at the option
* 1 Nlmrn2 = 1 MPa
2
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD IS0 3506-1979 (E)
Corrosion-resistant stainless steel fasteners -
Specifications
O INTRODUCTION - effective thread engagement is at least 0,6 times
nominal diameter.
In the preparation of this International Standard, special
This International Standard does not define corrosion or
attention has been given to the fundamentally different
oxidation resistance in particular environments. It does
property characteristics of the stainless steel fastener grades
specify grades for fasteners made from corrosion-resistant
compared with carbon and low-alloy steel fasteners of
stainless steels. Some have mechanical properties allowing
similar dimensions. The ferritic and austenitic stainless
3, use at temperatures down to -2OOOC in air. Some have
steels are strengthened only by cold working, and conse-
oxidation resistance allowing use at temperatures up to
quently the components do not have as homogeneous a
+ 800 OC in air.
condition as a hardened and tempered part. These special
features have been recognized in the preparation of the
Acceptable corrosion and oxidation performances and
clauses applicable to property classes and the mechanical
mechanical property values allowing use at elevated or sub-
test procedures, which differ from the carbon and low alloy
zero temperatures must be the subject of agreement between
steel fastener test procedures with regard to the measure-
user and manufacturer wherever appropriate to the proposed
ment of yield point (stress at 0,2 % permanent strain) and
service environment.
ductility (total extension at fracture) on the finished
component.
2 REFERENCES
IS0 68, IS0 general purpose screw threads - Basic profile.
ISOIR 79, Brinell hardness test for steel.
1 SCOPE AND FIELD OF APPLICATION
ISOIR 80, Rockwell hardness test (Band Cscales) for steel.
This International Standard gives specifications for bolts,
screws, studs and nuts made from austenitic, ferritic and
ISOIR 81, Vickers hardness test for steel.
martensitic grades of corrosion-resistant stainless steels.
IS0 82. Steel - Tensile testing.
It is applicable only to fastener components after com-
ISO262, IS0 general purpose metric screw threads -
pletion of manufacture,
Selected sizes for screws, bolts and nuts.
1)
- with nominal thread diameters from 1,6 up to and
IS0 6831x11 I, Heat-treated steels, alloy steels and free-
including 39 mm,
cutting steels - Part Xlll : Wrought stainless steels.
- of any triangular IS0 metric threads according to
IS0 89811, Mechanical properties of fasteners - Part I :
IS068 and with diameters and pitches according to
Bolts, screws and studs.
IS0 262,
IS0 89811 I, Mechanical properties of fasteners - Part II :
- of any shape;
Nuts with specified proof load values.’ ’
and additionally for nuts of any shape provided that IS0 3651, Austenitic stainless steels - Determination of
resistance to intergranular corrosion.
- width across flats or outside diameters is not less
than 1,45 times nominal diameter, and IS0 4954, Steels for cold heading and extruding. 2,
1) At present at the stage of draft. (Revision of ISO/R 898/11-1969 and IS0 898/1\1-1972.)
2) At present at the stage of draft.
1
---------------------- Page: 7 ----------------------
IS0 3506-1979 (E)
of the manufacturer or at the specific request of the pur-
3 DESIGNATION, MARKING, FINISH AND MAGNETIC
chaser. This additional marking should not be liable to
PROPERTIES
cause confusion with any other standardized marking or
identification.
3.1 Designation
The designation of fasteners is given in table 1. The steel
grades and property classes are designated by a four-charac- 3.2.2 Studs and other fasteners
ter identifier consisting of a letter followed by three digits.
Marking of studs and other fasteners shall beagreed betwedn
The letter indicates the general composition groups of steels
user and manufacturer.
as follows :
A for austenitic steels;
3.2.3 Nuts
C for martensitic steels;
Nuts shall be marked with the steel grade and property
F for ferritic steels.
class, if necessary, and with the manufacturer's identi-
fication mark in the case of nuts of M5 nominal thread
The first digit following the letter indicates the type of
diameter and greater (see figure 21, where this is technically
alloying elements present for the particular group A, C or
possible for the manufacturer. Marking of one nut face is
F. The last two digits indicate the property class (metallur-
acceptable and shall be by indentation only when applied
gical condition); for example :
to the bearing surface of the nuts. Alternatively, marking
on the side of the nuts is permissible. Property class
1 ) A2-70 indicates :
marking and designation of nuts is necessary where the nuts
austenitic steel, cold-worked, minimum 700 N/mm2*
do not meet the minimum proof load stress of the highest
tensile strength.
property class for the steel grade.
2) C4-70 indicates :
martensitic 12 % Cr steel, hardened and tempered,
3.2.4 Packages and containers
minimum 700 N/mm2 tensile strength.
Marking of the designation is mandatory on all packages
3.2 Marking
or containers of all sizes.
3.2.1 Bolts and screws
3.3 Finish
All hexagon head screws and bolts and socket cap screws
Unless otherwise specified, stainless steel fasteners shall be
of M5 thread diameter and greater shall be clearly marked
supplied clean and bright.
in accordance with the designation system given in 3.1. This
marking can be applied to other types of bolts and screws
where it is technically possible to do so on the head portion
only. 3.4 Magnetic properties
The marking shall include the steel grade and property class All austenitic stainless steel fasteners are normally non-
0
and also the manufacturer's identification mark (see magnetic; after cold working, some magnetic properties
figure 1). Additional marking can be applied at the option may be evident.
* 1 Nlmm2 = 1 MPa
2
---------------------- Page: 8 ----------------------
IS0 3506-1979 (E)
TABLE 1 - IS0 designation system for stainless steel fasteners
Ferritic Martensitic
Composition groups' ) Austenitic
7
I
l I
F1 c1 c4 c3
A x
80
45 60 50
I I I I I
Soft Cold-worked Soft Hardened Hardened
Soft Cold-worked High-strength
and
and
tempered tempered
See table 2 for composition ranges.
2) For IS0 steels, see IS0 683/Xlll, annex A, IS0 4954 and annex B.
3
---------------------- Page: 9 ----------------------
IS0 3506-1979 (E)
Manufacturer
XYZ
[-m-]
c3
-@ A2-50
m
Property class only
for lower strength grades
(see 3.2.3)
Alternative
groove marking
for A2 and A4
steel grades only
A2 A4
s =width across flats
FIGURE 2 - Marking of nuts - Examples of alternative marking practice
NOTE - For marking of left-hand thread, see IS0 898/1 and IS0 898/1i.
4
---------------------- Page: 10 ----------------------
IS0 3506-1979 (E)
5 MECHANICAL PROPERTIES
4 CHEMICAL COMPOSITION
The composition ranges of steels suitable for the different
5.1 Tests for acceptability
steel grades for fasteners are given in table 2.
5.1.1 Bolts, screws and studs of M5 nominal thread
At the discretion of the manufacturer, fasteners may be
diameter and smaller
manufactured from all steels corresponding to the grade
required, except where the user specifies steels covered by
Testing shall be carried out by one of the following
particular IS0 or national specifications. Alternative steels
acceptance tests :
may be used provided that they give the physical and
mechanical properties to the required steel grade and
- tensile strength, minimum (see 6.2);
property class and have equivalent corrosion resistance.
- breaking torque, minimum (see 6.5).
When alternative compositions are used, consultation
between the manufacturer and the user may be necessary
(Torque test values are valid only for austenitic steel
in order to ensure suitability for the intended application.
grades.)
Only when all these conditions are met shall parts be
marked and/or described according to the designation
5.1.2 Bolts, screw and studs above M5 nominal thread
system described in clause 3.
diameter
steel fasteners of grades A2 and A4 shall not
0 Austenitic
- tensile strength, minimum (see 6.2);
show any grain-boundary carbide network and shall be
resistant to inter-crystalline corrosion tests as defined in
- stress at 0,2 % permanent strain, minimum (yield
IS0 3651.
strength) (see 6.3);
Grade Al fasteners can also be supplied r
...
SLOVENSKI STANDARD
SIST ISO 3506:1996
01-april-1996
Mehanske lastnosti veznih elementov iz nerjavnih jekel in jekel, odpornih proti
kislinam
Corrosion-resistant stainless steel fasteners -- Specifications
Éléments de fixation en acier inoxydable résistant à la corrosion -- Spécifications
Ta slovenski standard je istoveten z: ISO 3506:1979
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
SIST ISO 3506:1996 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 3506:1996
---------------------- Page: 2 ----------------------
SIST ISO 3506:1996
International Standard 3506
~
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEKYHAPO~HAR OPTAHil3AUMR no CTAHAAPTH3AUMM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Corrosion-resistant stainless steel fasteners -
Specifications
Eléments de fixation en acier inoxydable résistant à la corrosion - Spécifications
First edition - 1979-05-15
UDC 621.882 : 669.14.018.8 Ref. No. IS0 3506-1979 (E)
Descriptors : fasteners, bolts, screws, studs, nuts (fasteners), specifications, designation, steel products, corrosion resistant steels, stainless
steels, austenitic steels, ferritic steels, martensitic steels, chemical composition, marking, mechanical properties, tests, mechanical tests, tension
tests, torsion tests, test equipment, elongation at rupture.
Price based on 14 pages
---------------------- Page: 3 ----------------------
SIST ISO 3506:1996
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up has the right to be represented on that committee. International organizatirms,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 3506 was developed by Technical Committee
2, Fasteners, and was circulated to the member bodies in June 1978.
lSO/TC
It has been approved by the member bodies of the following countries :
Australia Germany, F.R. Poland
Austria Hungary Romania
Belgium India South Africa, Rep. of
Bulgaria Ireland Sweden
Canada Italy Switzerland
Chile Japan
Turkey
Denmark Korea, Rep. of United Kingdom
Mexico
Egypt, Arab Rep. of USA
Finland Netherlands USSR
France Norway
The member body of the following country expressed disapproval of the document
on technical grounds :
New Zealand
Q International Organization for Standardization, 1979 O
Printed in Switzerland
ii
---------------------- Page: 4 ----------------------
SIST ISO 3506:1996
CONTENTS Page
O Introduction . 1
1 Scope and field of application . 1
2 References . 1
3 Designation. marking. finish and magnetic properties . 2
4 Chemical composition . 5
5 Mechanical properties . 5
6 Methodsoftest . 6
Annexes
A Stainless steel composition specifications
(Extract from IS0 683/Xlll) . 11
r B Stainless steel composition specifications
(Extract from IS0 4954) . 12
C Screw thread . Tensile stress areas . 13
D Total extension at fracture (AL) . 14
...
III
---------------------- Page: 5 ----------------------
SIST ISO 3506:1996
*
e
---------------------- Page: 6 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
INTERNATIONAL STANDARD
Corrosion-resistant stainless steel fasteners -
Specifications
O INTRODUCTION - effective thread engagement is at least 0,6 times
nominal diameter.
In the preparation of this International Standard, special
This International Standard does not define corrosion or
attention has been given to the fundamentally different
oxidation resistance in particular environments. It does
property characteristics of the stainless steel fastener grades
specify grades for fasteners made from corrosion-resistant
compared with carbon and low-alloy steel fasteners of
stainless steels. Some have mechanictl properties allowing
similar dimensions. The ferritic and austenitic stainless
use at temperatures down to -200 C in air. Some have
steels are strengthened only by cold working, and conse-
oxidation resistance allowing use at temperatures up to
quently the components do not have as homogeneous a
+ 800 OC in air.
condition as a hardened and tempered part. These special
features have been recognized in the preparation of the
Acceptable corrosion and oxidation performances and
clauses applicable to property classes and the mechanical
mechanical property values allowing use at elevated or sub-
test procedures, which differ from the carbon and low alloy
zero temperatures must be the subject of agreement between
steel fastener test procedures with regard to the measure-
user and manufacturer wherever appropriate to the proposed
ment of yield point (stress at 0,2 % permanent strain) and
sew ice environment.
ductility (total extension at fracture) on the finished
component.
2 REFERENCES
tS0 68, IS0 general purpose screw threads - Basic profile.
ISOIR 79, Brinell hardness test for steel.
1 SCOPE AND FIELD OF APPLICATION
ISOIR 80, Rockwell hardness test (B and Cscales) for steel.
This International Standard gives specifications for bolts,
screws, studs and nuts made from austenitic, ferritic and
ISOIR 8 1, Vickers hardness test for steel.
martensitic grades of corrosion-resistant stainless steels.
IS0 82, Steel - Tensile testing.
It is applicable only to fastener components after com-
ISO262, IS0 general purpose metric screw threads -
pletion of manufacture,
Selected sizes for screws, bolts and nuts.
- with nominal thread diameters from 1,6 up to and
IS0 6831x11 I, Heat-treated steels, alloy steels and free-
including 39 mm,
cutting steels - Part XII1 : Wrought stainless steels.
- of any triangular IS0 metric threads according to
IS0 89811, Mechanical properties of fasteners - Part I :
IS068 and with diameters and pitches according to
Bolts, screws and studs.
IS0 262,
IS0 8981 I I, Mechanical properties of fasteners - Part II :
- of any shape;
Nuts with specified proof load values.
and additionally for nuts of any shape provided that
IS0 3651, Austenitic stainless steels - Determination of
resistance to intergranular corrosion.
- width across flats or outside diameters is not less
than 1,45 times nominal diameter, and IS0 4954, Steels for cold heading and extruding.)
1) At present at the stage of draft. (Revision of ISO/R 898/11-1969 and IS0 898/1\1-1972.)
2) At present at the stage of draft.
1
---------------------- Page: 7 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
of the manufacturer or at the specific request of the pur-
3 DESIGNATION, MARKING, FINISH AND MAGNETIC
chaser. This additional marking should not be liable to
PROPERTIES
cause confusion with any other standardized marking or
identification.
3.1 Designation
The designation of fasteners is given in table 1. The steel
ds and other fasteners
grades and property classes are designated by a fourçharac-
ter identifier consisting of a letter followed by three digits.
Marking of studs and other fasteners shall be agreed between
The letter indicates the general composition groups of steels
user and manufacturer.
as follows :
A for austenitic steels;
3.2.3 Nuts
C for martensitic steels;
Nuts shall be marked with the steel grade and property
F for ferritic steels.
class, if necessary, and with the manufacturer's identi-
fication mark in the case of nuts of M5 nom
The first digit following the letter indicates the type of
diameter and greater (see figure 21, where this is
alloying elements present for the particular group A, C or
possible for the manufacturer. Marking of one nut face is
F. The last two digits indicate the property class (metallur-
acceptable and shall be by indentation only when applied
e
gical condition); for example :
to the bearing surface of the nuts. Alternatively, marking
on the side of the s is permissible. Property class
1) A2-70 indicates :
marking and designati f nuts is necessary where the nuts
austenitic steel, cold-worked, minimum 700 N/mm2*
do not meet the minimum proof load stress of the highest
tensile strength.
property class for the steel grade.
2) C4-70 indicates :
martensitic 12 % Cr steel, hardened and tempered,
3.2.4 Packages and containers
minimum 700 N/mm2 tensile strength.
Marking of the designation is mandatory on all packages
3.2 Marking
or containers of all sizes.
3.2.1 Bolts and screws
3.3 Finish
All hexagon head screws and bolts and socket cap screws
steel fasteners shall be
Unless otherwise specified, stainless
of M5 thread diameter and greater shall be clearly marked
in accordance with the designation system given in 3.1. This
marking can be applied to other types of bolts and screws
where it is technically possible to do so on the head portion
3.4 Magnetic properties
only.
AII austenitic stainless steel fasteners are normally non-
The marking shall include the steel grade and property class
'magnetic; after cold working, some magnetic properties
and also the manufacturer's identification mark (see
may be evident.
figure 1). Additional marking can be applied at the option
* 1 Nlmrn2 = 1 MPa
2
---------------------- Page: 8 ----------------------
SIST ISO 3506:1996
INTERNATIONAL STANDARD IS0 3506-1979 (E)
Corrosion-resistant stainless steel fasteners -
Specifications
O INTRODUCTION - effective thread engagement is at least 0,6 times
nominal diameter.
In the preparation of this International Standard, special
This International Standard does not define corrosion or
attention has been given to the fundamentally different
oxidation resistance in particular environments. It does
property characteristics of the stainless steel fastener grades
specify grades for fasteners made from corrosion-resistant
compared with carbon and low-alloy steel fasteners of
stainless steels. Some have mechanical properties allowing
similar dimensions. The ferritic and austenitic stainless
3, use at temperatures down to -2OOOC in air. Some have
steels are strengthened only by cold working, and conse-
oxidation resistance allowing use at temperatures up to
quently the components do not have as homogeneous a
+ 800 OC in air.
condition as a hardened and tempered part. These special
features have been recognized in the preparation of the
Acceptable corrosion and oxidation performances and
clauses applicable to property classes and the mechanical
mechanical property values allowing use at elevated or sub-
test procedures, which differ from the carbon and low alloy
zero temperatures must be the subject of agreement between
steel fastener test procedures with regard to the measure-
user and manufacturer wherever appropriate to the proposed
ment of yield point (stress at 0,2 % permanent strain) and
service environment.
ductility (total extension at fracture) on the finished
component.
2 REFERENCES
IS0 68, IS0 general purpose screw threads - Basic profile.
ISOIR 79, Brinell hardness test for steel.
1 SCOPE AND FIELD OF APPLICATION
ISOIR 80, Rockwell hardness test (Band Cscales) for steel.
This International Standard gives specifications for bolts,
screws, studs and nuts made from austenitic, ferritic and
ISOIR 81, Vickers hardness test for steel.
martensitic grades of corrosion-resistant stainless steels.
IS0 82. Steel - Tensile testing.
It is applicable only to fastener components after com-
ISO262, IS0 general purpose metric screw threads -
pletion of manufacture,
Selected sizes for screws, bolts and nuts.
1)
- with nominal thread diameters from 1,6 up to and
IS0 6831x11 I, Heat-treated steels, alloy steels and free-
including 39 mm,
cutting steels - Part Xlll : Wrought stainless steels.
- of any triangular IS0 metric threads according to
IS0 89811, Mechanical properties of fasteners - Part I :
IS068 and with diameters and pitches according to
Bolts, screws and studs.
IS0 262,
IS0 89811 I, Mechanical properties of fasteners - Part II :
- of any shape;
Nuts with specified proof load values.’ ’
and additionally for nuts of any shape provided that IS0 3651, Austenitic stainless steels - Determination of
resistance to intergranular corrosion.
- width across flats or outside diameters is not less
than 1,45 times nominal diameter, and IS0 4954, Steels for cold heading and extruding. 2,
1) At present at the stage of draft. (Revision of ISO/R 898/11-1969 and IS0 898/1\1-1972.)
2) At present at the stage of draft.
1
---------------------- Page: 9 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
of the manufacturer or at the specific request of the pur-
3 DESIGNATION, MARKING, FINISH AND MAGNETIC
chaser. This additional marking should not be liable to
PROPERTIES
cause confusion with any other standardized marking or
identification.
3.1 Designation
The designation of fasteners is given in table 1. The steel
grades and property classes are designated by a four-charac- 3.2.2 Studs and other fasteners
ter identifier consisting of a letter followed by three digits.
Marking of studs and other fasteners shall beagreed betwedn
The letter indicates the general composition groups of steels
user and manufacturer.
as follows :
A for austenitic steels;
3.2.3 Nuts
C for martensitic steels;
Nuts shall be marked with the steel grade and property
F for ferritic steels.
class, if necessary, and with the manufacturer's identi-
fication mark in the case of nuts of M5 nominal thread
The first digit following the letter indicates the type of
diameter and greater (see figure 21, where this is technically
alloying elements present for the particular group A, C or
possible for the manufacturer. Marking of one nut face is
F. The last two digits indicate the property class (metallur-
acceptable and shall be by indentation only when applied
gical condition); for example :
to the bearing surface of the nuts. Alternatively, marking
on the side of the nuts is permissible. Property class
1 ) A2-70 indicates :
marking and designation of nuts is necessary where the nuts
austenitic steel, cold-worked, minimum 700 N/mm2*
do not meet the minimum proof load stress of the highest
tensile strength.
property class for the steel grade.
2) C4-70 indicates :
martensitic 12 % Cr steel, hardened and tempered,
3.2.4 Packages and containers
minimum 700 N/mm2 tensile strength.
Marking of the designation is mandatory on all packages
3.2 Marking
or containers of all sizes.
3.2.1 Bolts and screws
3.3 Finish
All hexagon head screws and bolts and socket cap screws
Unless otherwise specified, stainless steel fasteners shall be
of M5 thread diameter and greater shall be clearly marked
supplied clean and bright.
in accordance with the designation system given in 3.1. This
marking can be applied to other types of bolts and screws
where it is technically possible to do so on the head portion
only. 3.4 Magnetic properties
The marking shall include the steel grade and property class All austenitic stainless steel fasteners are normally non-
0
and also the manufacturer's identification mark (see magnetic; after cold working, some magnetic properties
figure 1). Additional marking can be applied at the option may be evident.
* 1 Nlmm2 = 1 MPa
2
---------------------- Page: 10 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
TABLE 1 - IS0 designation system for stainless steel fasteners
Ferritic Martensitic
Composition groups' ) Austenitic
7
I
l I
F1 c1 c4 c3
A x
80
45 60 50
I I I I I
Soft Cold-worked Soft Hardened Hardened
Soft Cold-worked High-strength
and
and
tempered tempered
See table 2 for composition ranges.
2) For IS0 steels, see IS0 683/Xlll, annex A, IS0 4954 and annex B.
3
---------------------- Page: 11 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
Manufacturer
XYZ
[-m-]
c3
-@ A2-50
m
Property class only
for lower strength grades
(see 3.2.3)
Alternative
groove marking
for A2 and A4
steel grades only
A2 A4
s =width across flats
FIGURE 2 - Marking of nuts - Examples of alternative marking practice
NOTE - For marking of left-hand thread, see IS0 898/1 and IS0 898/1i.
4
---------------------- Page: 12 ----------------------
SIST ISO 3506:1996
IS0 3506-1979 (E)
5 MECHANICAL PROPERTIES
4 CHEMICAL COMPOSITION
The composition ranges of steels suitable for the different
5.1 Tests for acceptability
steel grades for fasteners are given in table 2.
5.1.1 Bolts, screws and studs of M5 nominal thread
At the discretion of the manufacturer, fasteners may be
diameter and smaller
manufactured from all steels corresponding to the grade
required, except where the user specifies steels covered by
Testing shall be carried out by one of the following
particular IS0 or national specifications. Alternative steels
acceptance tests :
may be used provided that they give the physical and
mechanical properties to the required steel grade and
- tensile strength, minimum (see 6.2);
property class and have equivalent corrosion resistance.
- breaking torque, minimum (see 6.5).
When alternative compositions are used, consultation
between the manufacturer and the user may be necessary
(Torque test values are valid only for austenitic steel
in order to ensure suitability for the intended application.
grades.)
Only when all these conditions are met shall parts be
marked and/or described according to the designation
5.1.2 Bolts, screw and studs above M5 nominal thread
system described in clause 3.
diameter
steel fa
...
Norme internationale 3506
~~~~~ ~
INTERNATIONAL ORGANIZATION FOR STANDARDÏZATlON.ME~YHAPOnHAR OPrAHH3AUHR no CTAH~fTH3A~HHWRGANlSATlON INTERNATIONALE DE NORMALISATION
Éléments de fixation en acier inoxydable résistant à la
%6
corrosion - Spécifications
Corrosion-resistant stainless steel fasteners - Specifications
Première édition - 1979-05-15
e
I
l
CDU 621.882: 669.14.018.8 Réf. no : IS0 3506-1979 (FI
-
Q)
Descripteurs : élément de fixation, boulon, vis, goujon, écrou, spécification, désignation, produit en acier, acier résistant à la corrosion, acier
E
inoxydable, acier austénitique, acier ferritique, acier martensitique, composition chimique, marquage, propriété mécanique, essai, essai
mécanique, essai de traction, essai de torsion, matériel d’essai, allongement à la rupture.
8
O
5 Prix basé sur 14 pages
---------------------- Page: 1 ----------------------
AVANT-PROPOS
L'ISO (Organisation internationale de normalisation) est une fédération mondiale
d'organismes nationaux de normalisation (comités membresde I'ISO). L'élaboration
des Normes internationales est confiée aux comités techniques de I'ISO. Chaque
comité membre intéressé par une étude a le droit de faire partiedu comitétechnique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I'ISO, participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont
soumis aux comités membres pour approbation, avant leur acceptation comme
Normes internationales par le Conseil de I'ISO.
La Norme, internationale IS0 3506 a été élaborée par le comité technique
ISO/TC 2, Eléments de fixation, et a été soumise aux comités membresen juin 1978.
Les comités membres des pays suivants l'ont approuvée :
Afrique du Sud, Rép. d' Égypte, Rép. arabe d' Pays-Bas
Allemagne, R.F. Finlande Pologne
Australie France Roumanie
Autriche Hongrie Royaume-Uni
Belgique Inde Suède
Bulgarie Irlande Suisse
Canada I tal ie Turquie
Chili Japon URSS
Corée, Rép. de Mexique USA
Danemark Norvège
l'a désapprouvée pour des raisons techniques :
Le comité membre du pays suivant
Nouvelle-Zélande
O Organisation internationale de normalisation, 1979
Imprimé en Suisse
II
---------------------- Page: 2 ----------------------
SOMMAIRE Page
O Introduction . 1
1 Objet et domaine d'application . 1
2 Références . 1
3 Désignation. marquage. finition et propriétés magnétiques . 2
4 Composition chimique . 5
5 Caractéristiques mécaniques . 5
6 Méthodesd'essai . 6
Annexes
A Spécification de la composition des aciers inoxydables
(Extrait de I'ISO 683/Xlll) . 11
B Spécification de la composition des aciers inoxydables
(Extrait de I'ISO 4954) . 12
C Filetages de vis - Section résistante . 13
D Allongement total à la rupture (AL ) . 14
iii
---------------------- Page: 3 ----------------------
NORME INTERNATIONALE IS0 3506-1979 (F)
Éléments de fixation en acier inoxydable résistant à la
corrosion - Spécifications
O INTRODUCTION
La présente Norme internationale ne précise pas la résistance
à la corrosion ou à l'oxydation dans des ambiances particu-
Dans la préparation de la présente Norme internationale,
lières. Les classes qu'elle spécifie s'appliquent aux éléments
il a été apporté une attention toute particulière à la dif-
de fixation en acier inoxydable résistant à la corrosion.
les caractéristiques des
férence fondamentale existant entre
Certaines ont des caractéristiques mécaniques valables pour
classes d'aciers inoxydables utilisés pour les éléments de
des emplois jusqu'à -200°C dans l'air; d'autres ont une
fixation et celles des aciers au carbone ou faiblement alliés
résistance à l'oxydation qui autorise leur emploi jusqu'à
destinés au même emploi et de dimensions comparables.
1.
+ 800 OC dans l'air.
Les aciers inoxydables ferritiques et austénitiques durcis-
La résistance à la corrosion et à l'oxydation, ainsi que les
sent uniquement par écrouissage. De ce fait, ils ne présen-
caractéristiques mécaniques à température élevée ou à
tent pas une structure aussi homogène que les aciers trempés
température au-dessous de zéro, doivent faire l'objet d'un
et revenus. II a été tenu compte de ces particularités dans
accord entre fournisseur et utilisateur en fonction des
l'étude des clauses relatives aux classes de propriétés et pour
conditions de service.
les conditions d'essai mécaniques, qui diffèrent des éléments
en acier au carbone ou faiblement allié en ce qui concerne
2 RÉFÉRENCES
la détermination de la limite élastique (allongement égal à
2 % de la longueur initiale) et de la ductilité (allongement
I SO 68, Filetages IS0 pour usages généraux - Profil de base.
total lors de la rupture) sur le produit fini.
ISOIR 79, Essai de dureté Brinell pour racier et la fonte.
ISOIR 80, Essai de dureté Rockwell (échelle B et échelle C)
pour racier.
1 OBJET ET DOMAINE D'APPLICATION
ISO/R 81, Essai de dureté Vickers pour racier (charges de 5
à 100 kgf).
La présente Norme internationale donne les spécifications
pour les boulons, vis, goujons et écrous en acier inoxydable
IS0 82, Acier - Essai de traction.
austénitique, ferritique et martensitique des nuances
résistant à la corrosion.
IS0 262, Filetages métriques IS0 pour usages généraux -
Sélection de dimensions pour la boulonnerie.
Elle est applicable uniquement aux éléments de fixation
0
terminés de fabrication,
IS0 6831x1 I I, Aciers pour traitement thermique, aciers
alliés et aciers pour décolletage - Treizième partie : Aciers
- de diamètre nominal compris entre 1,6 et 39 mm,
corroyés inoxydables.
- de filetage triangulaire métrique IS0 conforme à
IS0 89811, Caractéristiques mécaniques des éléments de
I'ISO 68, avec diamètres et pas conformes à I'ISO 262,
fixation - Partie I : Boulons, vis et goujons.
- de forme quelconque;
IS0 89811 I, Caractéristjques mécaniques des éléments de
fixation - Partie II : Ecrous pour lesquels des valeurs de
et, en complément pour les écrous de forme quelconque,
charge d'épreuve sont spécifiées.' )
- dont le surplat ou le diamètre extérieur sont supé-
rieurs ou égaux à 1,45 fois le diamètre nominal, et IS0 3651, Aciers inoxydables austénitiques - Détermi-
nation de la résistance à la corrosion intergranulaire.
- la longueur de filetage en prise est au moins égale à
0,6 fois le diamètre nominal. IS0 4954, Aciers pour refoulement à froid et extrusion.2)
1) Actuellement au stade de projet. (Révision de I'ISO/R 898/11-1969 et de I'ISO/R 898-IV-1972.)
2) Actuellement au stade de projet.
1
---------------------- Page: 4 ----------------------
I IS0 3506-1979 (FI
3 DÉSIGNATION, MARQUAGE, FINITION ET être appliqué au choix du fabricant ou sur demande spéciale
PROPR I ETES MAGNETIQUES du client. Ce marquage complémentaire ne doit pas créer
de confusion avec tout autre marquage normalisé ou d'iden-
tification.
3.1 Désignation
tableau 1. Les nuances d'acier et classes
3.2.2 Goujons et autres éléments de fixation
Le marquage des goujons et autres éléments de fixation est
soumis à un accord entre l'utilisateur et le fabricant.
A pour les aciers austénitiques;
3.2.3 Écrous
C pour les aciers martensitiques;
Les écrous doivent être marqués avec la nuance d'acier et,
F pour les aciers ferritiques.
si nécessaire, la classe de propriétés, et porter la marque
d'identification du fabricant dans le cas des écrous de dia-
mètre de filetage égal ou supérieur à M5 (voir figure 21, à
éléments d'alliage présents dans le groupe A, C ou
l'endroit le plus commode pour le fabricant. Le marquage
sur une seule face est admis et, s'il est fait sur la face
d'appui, il doit être uniquement en creux. En variante, le
(état métallurgique); par exemple :
marquage sur le côté des écrous est autorisé. Le marquage
I
1) A2-70 indique :
de la classe de propriétés et la désignation des écrous est
nécessaire lorsque les écrous ne présentent pas la résistance
minimale à la charge d'épreuve caractérisant la classe de
qualité la plus élevée dans cette catégorie d'acier.
2) C3-70 indique :
3.2.4 Emballage
Le marquage de la désignation est obligatoire sur tous les
3.2 Marquage
emballages de toutes tailles.
3.2.1 Boulons et vis
I
3.3 Finition
Les vis et boulons à tête hexagonale et les v
creux de diamètre de filetage supérieur ou égal
Sauf spécification contraire, les éléments de fixation en
être clairement marqués conformément au
acier inoxydable doivent être livrés propres et brillants.
techniquement possible de le faire sur la tête.
3.4 Propriétés magnétiques
Tous les éléments de fixation en acier inoxydable austé- i.
nitique sont normalement non magnétiques. Après écrouis-
sage, quelques propriétés magnétiques peuvent apparaître.
* 1 N/rnrn* = 1 MPa
---------------------- Page: 5 ----------------------
IS0 3506-1979 (F)
TABLEAU 1 - Système de désignation IS0 pour les éléments de fixation en acier inoxydable
Groupes de
Martensitique
composition1 )
iJ
r-l
e I
+l il
Identification
F1 c1 c4 c3
des nuances d'aciers)
x
Classes de
50 45 60 50 70 80
propriétés
l I Il
I
trempé et
doux écroui résistance doux écroui doux trempé et
élevée revenu
revenu
1) Voir tableau 2 pour les fourchettes de composition.
2) Pour les aciers ISO, voir IS0 683/Xlll, annexe A, IS0 4954 et annexe B.
3
---------------------- Page: 6 ----------------------
IS0 3506-1979 (F)
I Variantes
I \
pour vis
à six pans
LClasse de
Nuance d'acier f
propriétés
FIGURE 1 -Marquage des boulons et des vis - Exemples
Classe de propriétés.
uniquement pour les
nuances de faible
résistance (voir 3.2.3)
Variante de
marquage par
saignée uniquement
pour les nuances
d'acier A2 et A4
A2 A4
s = largeur sur plats
FIGURE 2 - Marquage des écrous - Exemples de variantes pratiques de marquage
NOTE - Pour le marquage du filetage à gauche, voir IS0 898/1 et IS0 898/11.
4
---------------------- Page: 7 ----------------------
IS0 3506-1979 (F)
4 COMPOSITION CHIMIQUE 5 CARACTÉRISTIQUES MÉCANIQUES
La composition des aciers correspondant aux différentes
5.1 Essais pour l'acceptabilité
nuances d'acier pour éléments de fixation est donnée dans
le tableau 2.
5.1.1 Boulons, vis et goujons de diamètre nominal de
Les éléments de fixation peuvent, à l'initiative du fabricant,
filetage inférieur ou égal à M5
à partir de tous les aciers correspondant à la
être fabriqués
L'acceptabilité doit être déterminée selon l'un des essais
si l'utilisateur spécifie un acier parti-
nuance exigée, sauf
suivants :
à des spécifications IS0 ou nationales.
culier correspondant
D'autres aciers peuvent être employés, à condition qu'ils
- résistance à la traction, minimum (voir 6.2);
aient des propriétés physiques et mécaniques correspondant
- couple de rupture, minimum (voir 6.5).
à la nuance d'acier et à la classe de propriétés exigées et, de
plus, une égale résistance à la corrosion. Si d'autres compo-
(Les valeurs d'essai de torsion ne sont valables que pour
sitions sont utilisées, une consultation entre le fabricant et
les nuances d'acier austénitique.)
l'utilisateur peut être nécessaire en vue d'assurer l'aptitude
à l'emploi prévu. Ce n'est que lorsque toutes ces conditions
sont remplies que les éléments doivent être marqués et/ou
5.1.2 Boulons, vis et goujons de diamètre nominal de
définis conformément au système de désignation décrit
filetage supérieur à M5
au chapitre 3.
- résistance à la traction, minimum (voir 6.2);
Les éléments de fixation en acier austénitique des nuances
A2 et A4 ne doivent pas présenter de liserés de carbure en
- limite d'élasticité à 0,2 %, minimum (résistance
réseau le long des joints de grains et doivent résister aux
élastique) (voir 6.3);
essais de corrosion intergranulaire définis dans I'ISO 3651.
- allongement à la rupture, minimum (voir 6.4);
Les éléments de fixation de nuance AI résistant à la corro-
sion intergranulaire peuvent être également fournis sous - essai de dureté, applicable uniquement aux nuances
réserve d'un accord préalable avec le fabricant.
CI, C3 et C4 à l'état trempé et revenu (voir 6.7).
TABLEAU 2 - Éléments de fixation en acier inoxydable - Composition des nuances
4
Composition chimique, % (m/m)')
Compositioi .
Groupe Groupe Nuance Nuance 1 Notes Notes 1
C C Si Si Mn Mn P P S S Cr Cr I Mo8) Mo8) I Ni Ni
8.0 à 10.0 2) 3)
Al 0.1 2 1.0 2.0 0.20 0,15à0,35 17,Oà 19.0 0.6
Austénitique A2 0.08 1,0 2,O 0.05 0.03 17,O à 20.0 8.0 à 13.0 3, 4, 5, 7,
A4 0,08
1.0 2,O 0.05 0,03 16.0 à 18.5 2.0 à 3.0 10.0 à 14.0 3, 4, 5,
6)
Cl 0,09 à 0.15 1,0 1,0 0,05 0,03 11.5 à 14,O 1 .O
Martensctique c3 0.17 à 0,25 1.0 1.0 0.04 0,03 16,O à 18.0 1.5 à 2.5
2) 6)
1,0 1.5 0,06 0.15à 0.35
c4 0,08à0,15 12,Oà 14.0 0.6 1 .O
3) 4) 7)
Ferritique F1 0,12 1.0 1.0 0.04 0.03 15.5 à 18.0
0.5
2) Le soufre peut être remplacé par du sélénium.
3) Peut contenir du titane en teneur > 5 XC jusqu'à 0,8 % maximum.
4) Peut contenir du niobium (columbium) et/ou du tantale en teneur > 10 XC jusqu'à 1,0 % maximum.
5) Peut contenir du cuivre jusqu'à 4.0 % maximum.
6) Le fabricant peut, si nécessaire, augmenter la teneur en carbone pour obtenir les caractéristiques mécaniques requises pour les grands
diamètres.
7) II peut y avoir également du molybdène, à l'initiative du fabricant.
8) Si, pour quelques applications, une teneur maximale en molybdène est essentielle, cela doit être spécifié au moment de la commande par
le client.
5
---------------------- Page: 8 ----------------------
IS0 3506-1979 (F)
70 et 80. Pour les éléments de fixation de grande longueur,
5.1.3 Écrous de tous diamètres nominaux de filetage
durcis par écrouissage, les valeurs de caractéristiques doivent
- charge d'épreuve égale à la résistance à la traction du
fair
...
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