ISO 6932:2001

Cold-reduced carbon steel strip with a maximum carbon content of 0,25 %

Feuillards en acier au carbone laminés à froid avec teneur maximale en carbone égale à 0,25 %

General Information

• Status: Withdrawn
• Publication Date: 21-Nov-2001
• Withdrawal Date: 21-Nov-2001
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Drafting Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 11-Aug-2008

Relations

• Revised: ISO 6932:2008 - Cold-reduced carbon steel strip with a maximum carbon content of 0,25 %
• Effective Date: 15-Apr-2008
• Revises: ISO 6932:1986 - Cold-reduced carbon steel strip with a maximum carbon content of 0,25 %
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6932
Second edition
2001-11-15

Cold-reduced carbon steel strip with a
maximum carbon content of 0,25 %
Feuillards en acier au carbone laminés à froid avec teneur maximale en
carbone égale à 0,25 %




Reference number
ISO 6932:2001(E)
©
ISO 2001

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ISO 6932:2001(E)
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ii © ISO 2001 – All rights reserved

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ISO 6932:2001(E)
Contents Page
Foreword.iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Conditions of manufacture.3
5 Dimensional tolerances.9
6 Sampling.12
7 Mechanical property tests .12
8 Retests.12
9 Resubmission.12
10 Workmanship.14
11 Inspection and acceptance.14
12 Coil size.14
13 Marking.14
14 Information to be supplied by the purchaser .14
Bibliography.16


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ISO 6932:2001(E)
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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 6932 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12,
Continuous mill flat rolled products.
This second edition cancels and replaces the first edition (ISO 6932:1986), which has been technically revised.

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INTERNATIONAL STANDARD ISO 6932:2001(E)

Cold-reduced carbon steel strip with a maximum carbon content
of 0,25 %
1 Scope
1.1 This International Standard applies to cold-reduced carbon steel strip with a maximum carbon content of
0,25 %, furnished to two levels of closer tolerances than cold-reduced carbon steel sheet, with specific quality,
specific hardness requirements or mechanical properties, specific edge and specific finish.
NOTE This International Standard does not apply to the product in narrow widths known as cold-reduced carbon steel
sheet slit from wider widths (ISO 3574), nor does it include cold-reduced carbon steel strip with a carbon content over 0,25 %
(ISO 4960).
1.2 Cold-reduced carbon steel strip is produced with a maximum of the specified carbon not exceeding:
 0,15 % for material specified to mechanical properties;
 0,25 % for material specified to temper (hardness) requirements.
1.3 This product is commonly produced in thicknesses of 6 mm and under, and in widths up to 600 mm, in coils
and cut lengths.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 6507-1:1997, Metallic materials — Vickers hardness test — Part 1: Test Method
ISO 6508-1:1999, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G,
H, K, N, T)
ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature
ISO 7438:1985, Metallic materials — Bend test
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ISO 6932:2001(E)
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
cold-reduced carbon steel strip
product manufactured from hot-rolled, descaled coils by cold reducing to the desired thickness on a single-stand
mill or on a tandem mill consisting of several single stands in series
3.2
cold reduction
process of reducing the thickness of the strip at room temperature whereby the amount of reduction is greater than
that used for a skin pass (see 3.9)
3.3
aluminum killed
steel which has been deoxidized with aluminum sufficient to prevent the evolution of gas during solidification
3.4
annealing
process of heating to and holding at a suitable temperature and then cooling at a suitable rate, for such purposes
as lowering hardness, facilitating cold working, producing a desired microstructure or obtaining desired mechanical,
physical or other properties
3.4.1
box annealing
annealing in a sealed container under conditions that minimize oxidation
NOTE The strip is usually heated slowly to a temperature below the transformation range, but sometimes above or within
it, and is then cooled slowly.
3.4.2
continuous annealing
annealing the strip in continuous strands through a furnace having a controlled atmosphere, followed by controlled
cooling
3.5
normalizing
heating to a suitable temperature above the transformation range and then cooling in air to a temperature
substantially below the transformation range
NOTE In bright normalizing the furnace atmosphere is controlled to prevent oxidation of the strip surface.
3.6
temper
designation by number or term to indicate the hardness as a minimum, as a maximum or as a range
NOTE The tempers are obtained by the selection and control of chemical composition, by amounts of cold reduction, by
thermal treatment and by a skin pass.
3.7
dead soft
condition describing annealed strip produced without definite control of stretcher-straining or fluting
NOTE It is suitable for drawing and other applications where such surface characteristics are not objectionable.
3.8
surface finish
degree of smoothness or lustre of the strip
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ISO 6932:2001(E)
3.9
skin pass
light cold rolling of the product resulting in an increase in hardness and some loss in ductility
NOTE The purpose of skin passing is to minimize the appearance of coil breaks, stretcher strains and fluting, or to control
shape, or to obtain the required surface finish.
4 Conditions of manufacture
4.1 Physical properties
Temper requirements according to Table 1 or mechanical properties according to Table 2 may be specified as
included in this International Standard, but not both since there is no direct correlation.
4.1.1 Cold-reduced carbon steel strip specified to mechanical properties is produced to the following commercial
and drawing quality designations:
 CR21: commercial quality
 CR22: drawing quality
 CR23: deep drawing quality
 CR24: deep drawing quality aluminum killed
4.1.2 Cold-reduced carbon steel strip specified to temper requirements is produced to the following temper
designations:
 No. 1: (hard)
 No. 2: (half hard)
 No. 3: (quarter hard)
 No. 4: (skin-passed)
 No. 5: (dead soft)
4.2 Steelmaking
The processes used in making the steel and in manufacturing cold-reduced carbon strip are left to the discretion of
the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used.
Except for grade CR24, the deoxidation practice shall be at the discretion of the manufacturer unless otherwise
agreed at the time of ordering.
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ISO 6932:2001(E)
Table 1 — Temper and hardness requirements for cold-reduced carbon steel strip
Temper Thickness, e Hardness
mm Rockwell B Rockwell Rockwell 15T Vickers
scale R30T scale scale
 HRB HR30T HR15T HV
e u 0,36
No. 1 — — 90 min. 185 min.
(hard)
0,36 < e u 1,0 — 76 min. — 185 min.
e > 1,0
84 min. — — 162 min.
a
e u 0,36
No. 2 — — 83,5 to 88,5 125 to 165
(half-hard)
0,36 < e u 1,0 — 63,5 to 73,5 — 125 to 165
e > 1,0 70 to 80 — — 125 to 165
a
e u 0,36
No. 3 — — 80 to 85 107 to 137
(quarter-hard)
0,36 < e u 1,0
— 56,5 to 66,5 — 107 to 137
e > 1,0 60 to 75 — — 107 to 137
a,b
e u 0,36
No. 4 — — 82 max. 116 max.
(skin-passed)
0,36 < e u 1,0
— 60 max. — 116 max.
e > 1,0 65 max. — — 116 max.
a,b
No. 5 e u 0,36 — — 78,5 max. 100 max.
(dead-soft)
0,36 < e u 1,0 — 53 max. — 100 max.
e > 1,0
55 max. — — 100 max.
a
Rockwell and Vickers hardness values apply to aluminum-killed steels. For non-killed steel (rimmed or capped) or semi-killed steels, the
values apply only at the time of shipment.
b
Nos. 4 and 5 temper may be ordered with a carbon range of 0,15 % to 0,25 %. In each instance, the maximum hardness requirement is
established by agreement.

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ISO 6932:2001(E)
a
Table 2 — Mechanical property requirements for cold-reduced carbon steel strip
c d
Quality designation Condition of A min
R max R

e m
b
%
delivery
2 2 e
L = 50 mm
 N/mm N/mm L = 80 mm
o
o
f
CR21 — — — —
HK
—
410 max. 28 32
TC
— 410 max. 28 32
HK270
—
290 to 430 18 24
HK290
— 390 to 540 — —
HK390
— — —
490 to 640
HK490
— 590 to 740 — —
HK590
— — —
690 min.
HK690
—
CR22 TC 370 max. 32 35
HK270 250 370 max. 32 35
HK290 355 290 to 410 21 25
HK390 — 390 to 510 5 13
HK490 — 490 to 620 — —
HK590 — 590 min. — —
CR23 TC — 350 max. 36 38
g
HK270 225 350 max. 36 38
HK290 325 290 to 390 23 27
HK390 — 390 to 490 6 14
— — —
HK490 490 to 600
HK590 — 590 min. — —
CR24 TC — 350 max 36 38
g
HK270 350 max 36 38
225
HK290 290 to 390 23 27
325
HK390 — 390 to 490 6 14
HK490 490 to 590 — —
—
— —
HK590 — 590 to 690
a
Longitudinal test pieces:
R yield strength
e
R tensile strength
m
A percentage elongation after fracture
L gauge length on test piece
o
S original cross-sectional area of gauge length
o
2
1N/mm = 1 MPa
b
Conditions of delivery: HK, cold-reduced; TC, annealed; HK270, skin-passed; HK290 to HK690, cold-reduced various amounts.
2
c
For thickness 0,7 mm and less the specified maximum yield strength values are increased by 20 N/mm .
2
d
Minimum tensile strength values for condition of delivery HK, TC and HK270 would normally be expected to be 270 N/mm .
e
Minimum elongation values are reduced by 2 % for thicknesses 0,5 mm to 0,7 mm inclusive and by 4 % for thicknesses less than
0,5 mm.
f
There are no mechanical property requirements for this condition.
g 2
For thicknesses 1,5 mm and greater the yield strength is 235 N/mm maximum.
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ISO 6932:2001(E)
4.3 Chemical Composition
4.3.1 General
The chemical composition (heat analysis) shall not exceed the values given in Tables 3 and 4.
4.3.2 Heat analysis
A heat analysis of each heat of steel shall be made by the manufacturer to determine compliance with the
requirements of Tables 3 and 4. When requested, at the time of ordering, this analysis shall be reported to the
purchaser or his representative.
4.3.3 Product analysis
A product analysis may be made by the purchaser to verify the specified analysis of the product and shall take into
consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped) are not technologically
suited to product analysis. For killed steels, the sampling method and deviation limits shall be agreed upon
between the interested parties at the time of ordering.
Table 3 — Chemical composition (heat analysis)
Values as percentages by mass
Temper or quality Carbon (C) Manganese (Mn) Phosphorus (P) Sulfur (S)
designation max. max. max. max.
Temper Nos. 1,2,3 0,25 0,60 0,035 0,04
Temper Nos. 4,5 0,15 0,60 0,035 0,04
CR21 0,15 0,60 0,05 0,05
CR22 0,12 0,50 0,04 0,04
CR23 0,10 0,45 0,03 0,03
CR24 0,08 0,45 0,03 0,03
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ISO 6932:2001(E)

a
Table 4 — Limits on additional chemi
...