SIST EN ISO 3506-1:2011
(Main)Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1:2009)
Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1:2009)
This part of ISO 3506 specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures.
This part of ISO 3506 applies to bolts, screws and studs
⎯with nominal thread diameter d u 39 mm,
⎯of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262, and
⎯of any shape.
It does not apply to screws with special properties, such as weldability.
NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause (e.g. d 39 mm), provided that all applicable mechanical and physical requirements of the property classes are met.
This part of ISO 3506 does not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex E. Regarding definitions of corrosion and corrosion resistance, see ISO 8044.
The aim of this part of ISO 3506 is the classification of corrosion-resistant stainless steel fasteners1) into property classes. Some materials can be used at temperatures down to −200 °C, while some can be used at temperatures up to 800 °C in air. Information on the influence of temperature on mechanical properties is found in Annex F.
Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero
temperatures can be agreed on between the user and the manufacturer in each particular case. Annex G shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content.
All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties can be evident (see Annex H).
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 1: Schrauben (ISO 3506-1:2009)
Dieser Teil von ISO 3506 legt die mechanischen Eigenschaften von Schrauben aus austenitischen,
martensitischen und ferritischen nichtrostenden Stählen bei Prüfung in einem Umgebungstemperaturbereich
zwischen 10 °C und 35 °C fest. Die Eigenschaften verändern sich bei höheren oder tieferen Temperaturen.
Dieser Teil von ISO 3506 gilt für Schrauben
⎯ mit Gewindenenndurchmessern d ≤ 39 mm;
⎯ mit metrischen ISO-Gewinden mit Durchmessern und Steigungen nach ISO 68-1, ISO 261 und ISO 262;
⎯ mit beliebiger Form.
Sie gilt nicht für Schrauben mit besonderen Eigenschaften, wie z. B die Schweißbarkeit.
ANMERKUNG Das Bezeichnungssystem in diesem Teil von ISO 3506 darf auch für Nenngrößen außerhalb der in
diesem Abschnitt angegebenen Grenzen (z. B. d > 39 mm) verwendet werden, vorausgesetzt alle der jeweiligen
Festigkeitsklasse zugeordneten mechanischen und physikalischen Anforderungen werden erfüllt.
Dieser Teil von ISO 3506 enthält keine Festlegungen über die Korrosion oder Korrosionsbeständigkeit in
besonderen Umgebungen, jedoch sind einige Angaben über Werkstoffe für bestimmte Umgebungen in
Anhang E enthalten. Für Definitionen zu Korrosion und Korrosionsbeständigkeit siehe ISO 8044.
Zweck dieses Teils von ISO 3506 ist eine Einteilung von Verbindungselementen aus nichtrostenden Stählen
in Festigkeitsklassen. Einige Werkstoffe können bei Temperaturen bis −200 °C, einige an Luft bei
Temperaturen bis +800 °C eingesetzt werden. Angaben über den Einfluss der Temperaturen auf die
mechanischen Eigenschaften sind in Anhang F enthalten.
Anforderungen an die Korrosionsbeständigkeit und die mechanischen Eigenschaften für den Einsatz bei
höheren Temperaturen oder bei Temperaturen unter 0 °C sollten in jedem Einzelfall zwischen Anwender und
Hersteller vereinbart werden. Im Anhang G ist dargestellt, wie die Gefahr einer interkristallinen Korrosion bei
erhöhten Temperaturen vom Kohlenstoffgehalt abhängt.
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion - Partie 1: Vis et goujons (ISO 3506-1:2009)
L'ISO 3506-1:2009 spécifie les caractéristiques mécaniques des vis et goujons constitués d'aciers inoxydables austénitiques, martensitiques et ferritiques résistant à la corrosion et soumis à essai à une température ambiante comprise entre 10 °C et 35 °C. Ces caractéristiques varient selon la valeur plus ou moins élevée de la température.
L'ISO 3506-1:2009 s'applique aux vis et goujons
de diamètre nominal de filetage d ≤ 39 mm,
à filetage métrique ISO triangulaire dont le diamètre et le pas sont conformes à l'ISO 68-1, à l'ISO 261 et à l'ISO 262, et
de forme quelconque.
Elle ne s'applique pas aux vis possédant des caractéristiques spéciales telles que la soudabilité.
Mehanske lastnosti veznih elementov iz nerjavnega jekla - 1. del: Vijaki (ISO 3506-1:2009)
Ta del ISO 3506 določa mehanske lastnosti vijakov, narejenih iz avstenitnih, martenzitnih in feritnih vrst nerjavnega jekla, odpornega proti koroziji, pri preskušanju v območju okoljske temperature med 10 °C in 35 °C. Lastnosti se spreminjajo glede na višje ali nižje temperature.
Ta del ISO 3506 velja za vijake
⎯ z nazivnim premerom navoja d u 39 mm,
⎯ s trikotnimi metrskimi navoji ISO s premeri in nakloni v skladu z ISO 68-1, ISO 261 in ISO 262 ter
⎯ katere koli oblike.
Ne velja za vijake s posebnimi lastnostmi, kot je varivost.
OPOMBA: Sistem označevanja v tem delu ISO 3506 se lahko uporablja za velikosti zunaj omejitev, podanih v tej točki (npr. d .39 mm), pod pogojem, da so izpolnjene veljavne mehanske in fizikalne zahteve lastnostnih razredov.
Ta del ISO 3506 ne opredeljuje odpornosti proti koroziji ali oksidaciji v nekaterih okoljih. Nekateri podatki o materialih za določena okolja so kljub temu navedeni v dodatku E. Za opredelitve korozije in odpornosti proti koroziji glej ISO 8044.
Namen tega dela ISO 3506 je razvrstitev veznih elementov iz nerjavnega jekla, odpornega proti koroziji, v lastnostne razrede. Nekateri materiali se lahko uporabljajo pri temperaturah zraka do najmanj −200 °C, drugi pa se lahko uporabljajo pri temperaturah do največ 800 °C. Podatki o vplivu temperature na mehanske lastnosti so navedeni v dodatku F.
O zmogljivostih, povezanih s korozijo in oksidacijo, in mehanskih lastnostih za uporabo pri povišanih temperaturah ali temperaturah pod nič se lahko dogovorita uporabnik in proizvajalec za vsak posamezen primer. Dodatek G prikazuje, kako je tveganje za interkristalno korozijo pri povišanih temperaturah odvisno od vsebnosti ogljika.
Vsi vezni elementi iz avstenitnega nerjavnega jekla so v nežarjenem stanju običajno nemagnetni; po hladni obdelavi so nekatere magnetne lastnosti očitne (glej dodatek H).
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mehanske lastnosti veznih elementov iz nerjavnega jekla - 1. del: Vijaki (ISO 3506-1:2009)Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 1: Schrauben (ISO 3506-1:2009)Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion - Partie 1: Vis et goujons (ISO 3506-1:2009)Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1:2009)21.060.10Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN ISO 3506-1:2009SIST EN ISO 3506-1:2011en,fr,de01-junij-2011SIST EN ISO 3506-1:2011SLOVENSKI
STANDARDSIST ISO 3506-1:2000SIST EN ISO 3506-1:20011DGRPHãþD
SIST EN ISO 3506-1:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 3506-1
November 2009 ICS 21.060.10 Supersedes EN ISO 3506-1:1997English Version
Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1:2009)
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion - Partie 1: Vis et goujons (ISO 3506-1:2009)
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 1: Schrauben (ISO 3506-1:2009) This European Standard was approved by CEN on 24 October 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3506-1:2009: ESIST EN ISO 3506-1:2011
EN ISO 3506-1:2009 (E) 2 Contents Page Foreword .3 SIST EN ISO 3506-1:2011
EN ISO 3506-1:2009 (E) 3 Foreword This document (EN ISO 3506-1:2009) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in collaboration with Technical Committee CEN/TC 185 “Fasteners”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 3506-1:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3506-1:2009 has been approved by CEN as a EN ISO 3506-1:2009 without any modification.
SIST EN ISO 3506-1:2011
SIST EN ISO 3506-1:2011
Reference numberISO 3506-1:2009(E)© ISO 2009
INTERNATIONAL STANDARD ISO3506-1Second edition2009-11-15Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion — Partie 1: Vis et goujons
SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
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SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved iii Contents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.2 3 Symbols.2 4 Designation, marking and finish.3 4.1 Designation.3 4.2 Marking.4 4.3 Finish.6 5 Chemical composition.6 6 Mechanical properties.7 7 Testing.9 7.1 Test programme.9 7.2 Test methods.10 Annex A (normative)
External thread – Calculation of stress area.14 Annex B (informative)
Description of the groups and grades of stainless steels.15 Annex C (informative)
Stainless steel composition specifications.18 Annex D (informative)
Stainless steels for cold heading and extruding.21 Annex E (informative)
Austenitic stainless steels with particular resistance to chloride induced stress corrosion.23 Annex F (informative)
Mechanical properties at elevated temperatures; application at low temperatures.24 Annex G (informative)
Time-temperature diagram of intergranular corrosion in austenitic stainless steels, grade A2 (18/8 steels).25 Annex H (informative)
Magnetic properties for austenitic stainless steels.26 Bibliography.27
SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) iv © ISO 2009 – All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3506-1 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. This second edition cancels and replaces the first edition (ISO 3506-1:1997), which has been technically revised. ISO 3506 consists of the following parts, under the general title Mechanical properties of corrosion-resistant stainless steel fasteners: ⎯ Part 1: Bolts, screws and studs ⎯ Part 2: Nuts ⎯ Part 3: Set screws and similar fasteners not under tensile stress ⎯ Part 4: Tapping screws SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved v Introduction In the preparation of this part of ISO 3506, special attention has been given to the fundamentally different property characteristics of the stainless steel fastener grades compared with those of carbon steel and low-alloy steel fasteners. Ferritic and austenitic stainless steels are strengthened only by cold working and consequently, the components do not have as homogeneous local material properties as hardened and tempered parts. These special features have been recognized in the elaboration of the property classes and the test procedures for mechanical properties. The latter differ from the carbon steel and low-alloy steel fastener test procedures with regard to the measurement of the stress at 0,2 % permanent strain (yield stress) and ductility (total elongation after fracture).
SIST EN ISO 3506-1:2011
SIST EN ISO 3506-1:2011
INTERNATIONAL STANDARD ISO 3506-1:2009(E) © ISO 2009 – All rights reserved 1 Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs 1 Scope This part of ISO 3506 specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures. This part of ISO 3506 applies to bolts, screws and studs ⎯ with nominal thread diameter d u 39 mm, ⎯ of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262, and ⎯ of any shape. It does not apply to screws with special properties, such as weldability. NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause (e.g. d > 39 mm), provided that all applicable mechanical and physical requirements of the property classes are met. This part of ISO 3506 does not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex E. Regarding definitions of corrosion and corrosion resistance, see ISO 8044. The aim of this part of ISO 3506 is the classification of corrosion-resistant stainless steel fasteners1) into property classes. Some materials can be used at temperatures down to − 200 °C, while some can be used at temperatures up to + 800 °C in air. Information on the influence of temperature on mechanical properties is found in Annex F. Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero temperatures can be agreed on between the user and the manufacturer in each particular case. Annex G shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content. All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties can be evident (see Annex H).
1) The term “fasteners” is used when bolts, screws and studs are considered all together. SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) 2 © ISO 2009 – All rights reserved 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads ISO 261, ISO general purpose metric screw threads — General plan ISO 262, ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread ISO 3651-1, Determination of resistance to intergranular corrosion of stainless steels — Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels — Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing sulfuric acid ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners ISO 16426, Fasteners — Quality assurance system 3 Symbols A elongation after fracture As,nom nominal stress area d nominal thread diameter d1 basic minor diameter of external thread d2 basic pitch diameter of external thread d3 minor diameter of external thread (for stress calculation) H height of the fundamental triangle of the thread L1 total length of fastener L2 total length of fastener after fracture L3 distance between the underside of the head and the threaded adapter l nominal length of the fastener ls plain shank length SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved 3 MB breaking torque P pitch of the thread ReL lower yield stress Rm tensile strength Rp0,2 stress at 0,2 % permanent strain α wedge angle µr permeability value in a magnetic field 4 Designation, marking and finish 4.1 Designation The designation system for stainless steel grades and property classes for bolts, screws and studs is given in Figure 1. The designation of the material consists of two blocks, which are separated by a hyphen. The first block designates the steel grade and the second block, the property class. The designation of the steel grade (first block) consists of one of the letters ⎯ A for austenitic steel, ⎯ C for martensitic steel, or ⎯ F for ferritic steel which indicates the group of steel and a digit, which indicates a range of chemical compositions within this steel group (see Table 1). The designation of the property class (second block) consists of two or three digits representing 1/10 of the tensile strength of the fastener, according to Table 2 or Table 3. EXAMPLE 1 A2-70 indicates: austenitic steel, cold worked, minimum 700 MPa tensile strength. EXAMPLE 2 C4-70 indicates: martensitic steel, hardened and tempered, minimum 700 MPa tensile strength. SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) 4 © ISO 2009 – All rights reserved
a The steel groups and steel grades classified in Figure 1 are described in Annex B and specified by the chemical composition given in Table 1. b Low-carbon austenitic stainless steels with carbon content not exceeding 0,03 % may additionally be marked with an “L”. EXAMPLE
A4L-80 c Fasteners passivated in accordance with ISO 16048 may additionally be marked with a “P”.
EXAMPLE
A4-80P Figure 1 — Designation system for stainless steel grades and property classes for bolts, screws and studs 4.2 Marking 4.2.1 General Fasteners manufactured according to the requirements of this part of ISO 3506 shall be designated in accordance with the designation system described in 4.1 and marked in accordance with 4.2.2 and 4.2.3 or 4.2.4, as applicable. However, the designation system described in 4.1 and the provisions for marking according to 4.2.3 or 4.2.4 shall be used only if all relevant requirements of this part of ISO 3506 are met. Unless otherwise specified in the product standard, the height of embossed markings on the top of the head shall not be included in the head height dimensions. NOTE For marking of left-hand threads, see ISO 898-1. 4.2.2 Manufacturer's identification mark A manufacturer's identification mark shall be included during the manufacturing process on all fasteners which are marked with a property class symbol. Manufacturer's identification marking is also recommended on fasteners which are not marked with a property class symbol. SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved 5 4.2.3 Bolts and screws All hexagon head bolts and screws, and hexagon or hexalobular socket head cap screws of nominal thread diameter d W 5 mm shall be clearly marked in accordance with 4.1, Figure 1, Figure 2 and Figure 3. The marking is mandatory and shall include the steel grade and property class.
Key 1 manufacturer's identification mark 2 steel grade 3 property class Figure 2 — Marking of hexagon head bolts and screws
Figure 3 — Marking of hexagon and hexalobular socket head cap screws — Alternative forms Other types of bolts and screws can be marked in the same way, where it is possible to do so and on the head portion only. Additional marking is allowed, provided it does not cause confusion. Fasteners that do not fulfil the tensile or torsional requirements because of the geometry (see Clause 6) may be marked with the steel grade, but shall not be marked with the property class (see Figure 4).
Figure 4 — Marking of fasteners not fulfilling tensile or torsional requirements because of the geometry SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) 6 © ISO 2009 – All rights reserved 4.2.4 Studs Studs of nominal thread diameter d W 6 mm shall be clearly marked in accordance with 4.1, Figure 1 and Figure 5. The marking shall be on the unthreaded part of the stud and shall contain the steel grade and property class. If marking on the unthreaded portion is not possible, marking of steel grade only on the nut end of the stud is allowed (see Figure 5).
Figure 5 — Marking of studs — Alternative forms 4.2.5 Packages All packages for all types of fasteners of all sizes shall be marked (e.g. through labelling). The marking or labelling shall include the manufacturer's and/or distributor's identification and the marking symbol for the steel grade and property class according to Figure 1 and the manufacturing lot number, as defined in ISO 16426. 4.3 Finish Unless otherwise specified, fasteners in accordance with this part of ISO 3506 shall be supplied clean and bright. For maximum corrosion resistance, passivation is recommended. When passivation is required, it shall be performed in accordance with ISO 16048. Fasteners that are passivated may additionally be marked with the symbol “P” after the symbols for steel grade and property class (see footnote c of Figure 1). For fasteners manufactured to a specific order, the additional marking should be applied to both the fastener and the label. For fasteners delivered from stock, the additional marking should be applied to the label. 5 Chemical composition The chemical compositions of stainless steels suitable for fasteners in accordance with this part of ISO 3506 are given in Table 1. The final choice of the chemical composition within the specified steel grade is at the discretion of the manufacturer, otherwise by prior agreement between the purchaser and the manufacturer. In applications where risk of intergranular corrosion is present, testing in accordance with ISO 3651-1 or ISO 3651-2 is recommended. In such cases, stabilized stainless steels of grades A3 and A5 or stainless steels of grades A2 and A4 with carbon content not exceeding 0,03 % are recommended. SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved 7 Table 1 — Stainless steel grades — Chemical composition Chemical compositiona mass fraction, % Steel group Steel grade C Si Mn P S Cr Mo Ni Cu FootnotesAustenitic A1 0,12 1 6,5 0,2 0,15 to 0,35 16 to 19 0,7 5 to 10 1,75 to 2,25 bcd
A2 0,10 1 2 0,05 0,03 15 to 20 —e 8 to 19 4 fg
A3 0,08 1 2 0,045 0,03 17 to 19 —e 9 to 12 1 h
A4 0,08 1 2 0,045 0,03 16 to 18,52 to 3 10 to 15 4 gi
A5 0,08 1 2 0,045 0,03 16 to 18,52 to 3 10,5 to 14 1 hi Martensitic C1 0,09 to 0,15 1 1 0,05 0,03 11,5 to 14— 1 — i
C3 0,17 to 0,25 1 1 0,04 0,03 16 to 18 — 1,5 to 2,5 — —
C4 0,08 to 0,15 1 1,5 0,06 0,15 to 0,35 12 to 14 0,6 1 — bi Ferritic F1 0,12 1 1 0,04 0,03 15 to 18 —j 1 — kl NOTE 1 A description of the groups and grades of stainless steels also entering into their specific properties and applications is given in Annex B. NOTE 2 Examples of stainless steels standardized in accordance with ISO 683-13 and ISO 4954 are given in Annexes C and D,respectively. NOTE 3 Certain materials for specific application are given in Annex E. a Values are maximum, unless otherwise indicated. b Sulfur may be replaced by selenium. c If the nickel content is below 8 %, the minimum manganese content shall be 5 %. d There is no minimum limit to the copper content, provided that the nickel content is greater than 8 %. e Molybdenum may be present at the discretion of the manufacturer. However, if for some applications limiting of the molybdenum content is essential, this shall be stated at the time of ordering by the purchaser. f If the chromium content is below 17 %, the minimum nickel content should be 12 %. g For austenitic stainless steels having a maximum carbon content of 0,03 %, nitrogen may be present to a maximum of 0,22 %. h This shall contain titanium W 5 × C up to 0,8 % maximum for stabilization and be marked appropriately as specified in this table, or shall contain niobium (columbium) and/or tantalum W 10 × C up to 1,0 % maximum for stabilization and be marked appropriately as specified in this table. i At the discretion of the manufacturer, the carbon content may be higher where required in order to obtain the specified mechanical properties at larger diameters, but shall not exceed 0,12 % for austenitic steels. j Molybdenum may be present at the discretion of the manufacturer. k This may contain titanium W 5 × C up to 0,8 % maximum. l This may contain niobium (columbium) and/or tantalum W 10 × C up to 1 % maximum. 6 Mechanical properties The mechanical properties of bolts, screws and studs in accordance with this part of ISO 3506 shall conform to the values given in Tables 2, 3 and 4. For bolts and screws made of martensitic steel, the strength under wedge loading shall not be below the minimum values for tensile strength shown in Table 3. For acceptance purposes, the mechanical properties specified in this clause apply and shall be tested according to the test programme in Clause 7. Even if the material of the fasteners meets all relevant requirements, it is possible that certain fasteners would not fulfil the tensile or torsional requirements because of the geometry of the head, which reduces the shear SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) 8 © ISO 2009 – All rights reserved area in the head compared to the stress area in the thread such as countersunk, raised countersunk and cheese heads. NOTE Although a great number of property classes are specified in this part of ISO 3506, this does not mean that all classes are appropriate for all fasteners. Further guidance for application of the specific property classes is given in the relevant product standards.
For non-standard fasteners, the choice already made for similar standard fasteners should be followed as closely as possible. Table 2 — Mechanical properties for bolts, screws and studs — Austenitic steel grades Steel group Steel grade Property class Tensile strength Rm a min. MPa Stress at 0,2 % permanent strain Rp0,2a min. MPa Elongation after fracture Ab min. mm Austenitic A1, A2, 50 500 210 0,6d
A3, A4, 70 700 450 0,4d
A5 80 800 600 0,3d a The tensile stress is calculated on the stress area (see Annex A). b This is determined according to 7.2.4, on the actual screw length and not on a prepared test piece.
Table 3 — Mechanical properties for bolts, screws and studs — Martensitic and ferritic steel grades Tensile strength Rma min. Stress at 0,2 % permanent strainRp0,2a min. Elongation after fracture Ab min. Hardness Steel group Steel grade Property class MPa MPa mm HB HRC HV Martensitic 50 500 250 0,2d 147 to 209 — 155 to 220 70 700 410 0,2d 209 to 314 20 to 34 220 to 330 C1 110c 1 100 820 0,2d — 36 to 45 350 to 440 C3 80 800 640 0,2d 228 to 323 21 to 35 240 to 340 50 500 250 0,2d 147 to 209 — 155 to 220 C4 70 700 410 0,2d 209 to 314 20 to 34 220 to 330Ferritic F1d 45 450 250 0,2d 128 to 209 — 135 to 220
60 600 410 0,2d 171 to 271 — 180 to 285a The tensile stress is calculated on the stress area (see Annex A). b This is determined according to 7.2.4, on the actual screw length and not on a prepared test piece. c Hardened and tempered at a minimum tempering temperature of 275 °C. d Nominal thread diameter d u 24 mm.
SIST EN ISO 3506-1:2011
ISO 3506-1:2009(E) © ISO 2009 – All rights reserved 9 Table 4 — Minimum breaking torque, MB,min., for austenitic steel grade bolts and screws M1,6 to M16 (coarse thread) Breaking torque, MB min. Nm Property class Thread 50 70 80 M1,6 0,15 0,2 0,24 M2 0,3 0,4 0,48 M2,5 0,6 0,9 0,96 M3 1,1 1,6 1,8 M4 2,7 3,8 4,3 M5 5,5 7,8 8,8 M6 9,3 13 15 M8 23 32 37 M10 46 65 74 M12 80 110 130 M16 210 290 330
Minimum breaking torque values for martensitic and ferritic steel grade fasteners shall be agreed upon between the manufacturer and the user. 7 Testing 7.1 Test programme The tests that shall be performed, depending on steel grade and bolt, screw or stud length, are given in Table 5. Table 5 — Test programme Steel grade Tensile strengtha Breaking torqueb Stress at 0,2 % permanent strainRp0,2a Elongation after fractureAa Hardness Strength under wedgeloading A1 l W 2,5dc l < 2,5d l W 2,5dc l W 2,5dc — — A2 l W 2,5dc l < 2,5d l W 2,5dc l W 2,5dc — — A3 l W 2,5dc l < 2,5d l W 2,5dc l W 2,5dc — — A4 l W 2,5dc l < 2,5d l W 2,5dc l W 2,5dc — — A5 l W 2,5dc l < 2,5d l W 2,5dc l W 2,5dc — — C1 l W 2,5dcd — l W 2,5dc l W 2,5dc Required ls W 2d C3 l W 2,5dcd — l W 2,5dc l W 2,5dc Required ls W 2d C4 l W 2,5dcd — l W 2,5dc l W 2,5dc Required ls W 2d F1 l W 2,5dcd — l W 2,5dc l W 2,5dc Required — a For all sizes W M5. b For sizes M1,6 u d < M5, the test applies to all lengths. c For studs, the requirement is l W 3,5d. d For l < 2,5d, testing shall be agreed on between the manufacturer and the purchaser. SIST E
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