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 %

General Information

Status
Published
Publication Date
22-Jul-2019
Current Stage
6060 - International Standard published
Start Date
05-Jun-2019
Completion Date
23-Jul-2019
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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)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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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

© ISO 2019 – All rights reserved iii
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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

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

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.
iv © ISO 2019 – All rights reserved
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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.

© ISO 2019 – All rights reserved 1
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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.
2 © ISO 2019 – All rights reserved
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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

Other manganese values can be specified upon agreement at the time of ordering, provided a range of 0,30 % is

maintained.

When specified, phosphorus and sulfur may be ordered to 0,020 % maximum by heat analysis.

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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