ISO 4960:2019
(Main)Steel strip, cold-reduced with a mass fraction of carbon over 0,25 %
Steel strip, cold-reduced with a mass fraction of carbon over 0,25 %
This document specifies the minimum requirements for steel strip of carbon over 0,25 %, in coils and cut lengths. The product is applicable to highly stressed parts of many different types and is characterized by close dimensional tolerances and controlled surface finishes. The steel strip is produced in a number of types and surface finishes to be compatible with differing applications requirements. This document does not apply to alloy steels or stainless steels.
Feuillards en acier au carbone laminés à froid à teneur en carbone supérieure à 0,25 %
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4960
Fourth edition
2019-07
Steel strip, cold-reduced with a mass
fraction of carbon over 0,25 %
Feuillards en acier au carbone laminés à froid à teneur en carbone
supérieure à 0,25 %
Reference number
ISO 4960:2019(E)
©
ISO 2019
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ISO 4960:2019(E)
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© ISO 2019
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Published in Switzerland
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ISO 4960:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Conditions of manufacture . 2
5.1 Steelmaking . 2
5.2 Chemical composition . 3
5.3 Chemical analysis . 3
5.3.1 Heat analysis . . 3
5.3.2 Product analysis . 3
5.4 Ordering conditions . 4
5.5 Mechanical properties . 5
5.5.1 Hardness . 5
5.5.2 Tensile properties . 5
5.6 Application . 5
5.7 Weldability . 5
5.8 Surface finish condition . 5
5.9 Oiling . 5
5.10 Dimensional tolerances . 7
6 Sampling . 8
7 Test methods . 8
7.1 Hardness test . 8
7.2 Tensile test . 8
8 Decarburization . 8
9 Retests . 8
9.1 Machining and flaws. 8
9.2 Additional tests . 8
10 Resubmission .11
11 Workmanship .11
12 Inspection and acceptance .11
13 Coil size .11
14 Marking .11
15 Information to be supplied by the purchaser.12
Bibliography .13
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ISO 4960:2019(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
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URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous
mill flat rolled products.
This fourth edition cancels and replaces the third edition (ISO 4960:2007), which has been technically
revised. The main changes compared to the previous edition are as follows:
— added definitions for surface finishes and "lot";
— revised scope;
— added Clause 4 for “Dimensions”;
— “Specified qualities appropriate to the particular grade” changed to “Ordering conditions”,
renumbered as 5.3;
— 5.5.1 changed from HRB to HRBW;
— previous 5.5 changed to 5.8 using revised surface finish terminology, addition of surface roughness
requirements;
— revised Table 5.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
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INTERNATIONAL STANDARD ISO 4960:2019(E)
Steel strip, cold-reduced with a mass fraction of carbon
over 0,25 %
1 Scope
This document specifies the minimum requirements for steel strip of carbon over 0,25 %, in coils and
cut lengths.
The product is applicable to highly stressed parts of many different types and is characterized by close
dimensional tolerances and controlled surface finishes.
The steel strip is produced in a number of types and surface finishes to be compatible with differing
applications requirements.
This document does not apply to alloy steels or stainless steels.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
cold-reduced carbon steel strip
product produced from a hot-rolled pickled coil which has been given substantial cold reduction
Note 1 to entry: The product is characterized by an improved surface, greater uniformity in thickness and
improved mechanical properties compared to hot-rolled strip. A cold-reduced strip is also characterized by
tighter thickness tolerances than a cold-reduced sheet, as well as by specified edges.
3.2
skin pass
light cold rolling of the product
Note 1 to entry: The purpose of the skin passing is one or more of the following: to minimize the appearance of
coil breaks, stretcher strains and fluting; to control the shape; and to obtain the required surface finish.
Note 2 to entry: Some increase in hardness and some loss in ductility will result from skin passing.
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ISO 4960:2019(E)
3.3
mill edge
normal side edge without any definite contour produced in hot rolling
Note 1 to entry: Mill edges may contain some irregularities, such as cracked or torn edges or thin (feathered) edges.
3.4
sheared edge
material with a burr developed where the material was cut
3.5
matte finish
dull finish
rougher finish obtained by temper passing cold-reduced strip using rolls roughened by mechanical or
chemical means
Note 1 to entry: Surface roughness of the strip is typically Ra 0,5 μm to 2,0 μm, which is beneficial in obtaining
better paint adhesion, and in aiding drawing by reducing surface friction due to better oil adhesion.
3.6
regular bright finish
moderately bright reflective lustre finish obtained by temper passing cold-reduced strip using rolls
with a ground finish
Note 1 to entry: Surface roughness of the strip is typically Ra 0,5 μm, which is suitable for many applications but
not necessarily for bright plating applications.
3.7
plating bright finish
smooth bright finish where a high lustre is not necessary obtained by temper passing cold-reduced
strip using rolls with a fine ground finish
Note 1 to entry: Surface roughness of the strip is typically Ra 0,25 μm max.
3.8
best bright finish
mirror bright finish obtained by temper passing cold-reduced strip using rolls with a polished finish
Note 1 to entry: Surface roughness is of the strip is typically Ra 0,10 μm max., which is suitable for bright plating.
3.9
lot
up to a specified quantity of material of the same designation rolled to the same thickness and surface
condition
4 Dimensions
Cold-reduced steel strip is commonly produced in thicknesses of 6 mm and under, and in widths up to
600 mm, in coils and cut lengths. Strip products may be available in widths greater than 600 mm by
agreement between producer and purchaser; however, such products are typically classified as cold-
rolled sheet.
5 Conditions of manufacture
5.1 Steelmaking
Unless otherwise agreed by the interested parties, the processes used in making the steel and in
manufacturing steel strips are left to the discretion of the manufacturer. On request, the purchaser
shall be informed of the steelmaking process being used.
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ISO 4960:2019(E)
5.2 Chemical composition
The chemical composition (heat analysis) shall conform to the requirements given in Tables 1 and 2.
5.3 Chemical analysis
5.3.1 Heat analysis
An analysis of each heat shall be made by the manufacturer in order to determine conformity with
the requirements given in Tables 1 and 2. On request, a report of the heat analysis shall be made
available to the purchaser or the purchaser’s representative. Each of the elements listed in Tables 1 and
2 shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium or
molybdenum present is less than 0,02 %, the analysis may be reported as “<0,02 %”.
5.3.2 Product analysis
A product analysis may be made by the purchaser in order to verify the specified analysis of the product
and shall take into consideration any normal heterogeneity. The product analysis shall be in accordance
with Tables 2 and 3.
Table 1 — Chemical composition (heat analysis)
Mass fractions in percent
a b b c
Grade C Mn P S Si
max. max. max.
CS30 0,28 to 0,34 0,60 to 0,90 0,035 0,03 0,35
CS35 0,32 to 0,38 0,60 to 0,90 0,035 0,03 0,35
CS40 0,37 to 0,44 0,60 to 0,90 0,035 0,03 0,35
CS45 0,43 to 0,50 0,60 to 0,90 0,035 0,03 0,35
CS50 0,48 to 055 0,60 to 0,90 0,035 0,03 0,35
CS55 0,50 to 0,60 0,60 to 0,90 0,035 0,03 0,35
CS60 0,55 to 0,65 0,60 to 0,90 0,035 0,03 0,35
CS65 0,60 to 0,70 0,60 to 0,90 0,035 0,03 0,35
CS70 0,65 to 0,75 0,60 to 0,90 0,035 0,03 0,35
CS75 0,70 to 0,80 0,40 to 0,70 0,035 0,03 0,35
CS85 0,80 to 0,93 0,70 to 1,00 0,035 0,03 0,35
CS95 0,90 to 1,03 0,30 to 0,50 0,035 0,03 0,35
a
Other manganese values can be specified upon agreement at the time of ordering, provided a range of 0,30 % is
maintained.
b
When specified, phosphorus and sulfur may be ordered to 0,020 % maximum by heat analysis.
c
Silicon can be specified as a restricted range upon agreement at the time of ordering.
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ISO 4960:2019(E)
Table 2 — Limits on additional chemical elements
Mass fractions in percent
Grade
...
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