ISO 13887:2011

INTERNATIONAL ISO
STANDARD 13887
Third edition
2011-11-15
Cold-reduced steel sheet of higher yield
strength with improved formability
Tôles laminées à froid en acier à limite d’élasticité et aptitude au
formage accrues
Reference number
©
ISO 2011
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ii © ISO 2011 – All rights reserved

Contents Page
Foreword .Lv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Conditions of manufacture . 1
4.1 Steelmaking . 1
4.2 Chemical composition . 2
4.3 Chemical analysis . 2
4.4 Weldability . 3
4.5 Application . 3
4.6 Mechanical properties . 3
4.7 Surface condition . 4
4.8 Surface finish . 4
4.9 Oiling . 4
5 Dimensional and shape tolerances . 4
6 Sampling . 4
6.1 Chemical composition . 4
6.2 Tensile test . 4
7 Mechanical property tests — Tensile test . 4
8 Retests . 4
8.1 Machining and flaws . 4
8.2 Additional tests . 5
9 Resubmission . 5
10 Workmanship . 5
11 Inspection and acceptance . 5
12 Coil size . 5
13 Marking . 5
14 Information to be supplied by the purchaser . 6
Bibliography . 7
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 13887 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat
rolled products.
This third edition cancels and replaces the second edition (ISO 13887:2004), which has been technically
revised.
iv © ISO 2011 – All rights reserved

Introduction
With the combination of higher strength and improved formability derived from the tests outlined in this
International Standard, it is possible to obtain savings in mass along with better weldability.
The last two standards listed in the Bibliography may be reviewed for comparison with this International
Standard. The relationship between the standards might only be approximate; therefore, the respective
standards should be consulted for actual requirements. Those who use these documents will need to determine
which specifications address their needs.
INTERNATIONAL STANDARD ISO 13887:2011(E)
Cold-reduced steel sheet of higher yield strength with improved
formability
1 Scope
This International Standard applies to all grades of cold-rolled steel sheet of higher yield strength with improved
formability. The steel is made according to fine-grain practice and has a suitable chemical composition,
including microalloying elements, to provide improved formability. The product is intended for the fabrication of
parts requiring better formability. It is generally used in the delivered condition.
This International Standard is not applicable to steels designated as commercial quality or drawing quality (see
ISO 3574), steels of structural quality (see ISO 4997) or steels of high tensile strength and low yield point with
improved formability (see ISO 14590).
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 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 16162, Continuously cold-rolled steel sheet products — Dimensional and shape tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cold-reduced steel sheet
product obtained from hot-rolled descaled steel sheet by cold-reducing to the required sheet thickness followed
by annealing to recrystallize the grain structure
3.2
skin pass
light cold-rolling of the product
NOTE The purpose of the skin passing is one or more of the following:
a) to minimize the appearance of coil breaks, stretcher strains and fluting;
b) to control the shape;
c) to obtain a required surface finish suitable for ordering decorative painting.
Some increase in hardness and some loss of ductility will result from skin passing.
4 Conditions of manufacture
4.1 Steelmaking
Unless otherwise agreed, the processes used in making the steel and in manufacturing cold-reduced steel sheet
are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking
process being used.
4.2 Chemical composition
The chemical composition (heat analysis) shall conform to the requirements in Tables 1 and 2.
Table 1 — Chemical analysis (heat analysis)
Values expressed as a mass fraction
C Mn S Si
Grade
% max. % max. % max. % max.
260Y 0,08 0,60 0,025 0,50
300Y 0,10 0,90 0,025 0,50
340Y 0,11 1,20 0,025 0,50
380Y 0,11 1,20 0,025 0,50
420Y 0,11 1,40 0,025 0,50
490Y 0,16 1,65 0,025 0,60
550Y 0,16 1,65 0,025 0,60
NOTE These steels may contain one or more m
...