ISO 14590:1999
(Main)Cold-reduced steel sheet of high tensile strength and low yield point with improved formability
Cold-reduced steel sheet of high tensile strength and low yield point with improved formability
Tôles en acier laminées à froid à haute résistance à la traction, basse limite inférieure d'écoulement et aptitude au formage accrue
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14590
First edition
1999-02-01
Cold-reduced steel sheet of high tensile
strength and low yield point with improved
formability
Tôles en acier laminées à froid à haute résistance à la traction, basse limite
inférieure d'écoulement et aptitude au formage accrue
A
Reference number
ISO 14590:1999(E)
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ISO 14590:1999(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.
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.
International Standard ISO 14590 was prepared by Technical Committee TC 17, Steels, Subcommittee SC 12,
Continuous mill flat rolled products.
Annex A forms an integral part of this International Standard.
© ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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INTERNATIONAL STANDARD © ISO ISO 14590:1999(E)
Cold-reduced steel sheet of high tensile strength and low
yield point with improved formability
1 Scope
1.1 This International Standard applies to killed, cold-reduced steel sheet of two types that are commercially
available in the world. The first type (see Table 1) represents steels that are produced to mechanical properties only
and the second type (see Table 2) are produced to both mechanical and chemical properties. Bake hardening
steels are included in both types.
Cold-reduced sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.
1.2
1.3 This International Standard does not cover steels designated as commercial quality or drawing qualities
(covered in ISO 3574), steels of structural quality (covered in ISO 4997) or steels of higher strength with improved
formability (covered in ISO 13887).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 6892:1998, Metallic materials – Tensile testing at ambient temperature.
ISO 7438:1985, Metallic materials – Bend test.
3 Definitions
For the purposes of this International Standard, the following 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 material (covered by this International Standard) the purpose being one or more of the
following:
a) minimize the appearance of coil breaks, stretcher strains and fluting;
b) control the shape;
c) obtain required surface finish suitable for ordering decorative painting.
NOTE Some increase in hardness and some loss of ductility will result from skin passing.
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ISO 14590:1999(E)
4 Conditions of manufacture
4.1 Steelmaking
Unless otherwise agreed upon, 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 given in Table 2. No chemical
composition is applicable to Table 1
4.3 Chemical analysis
4.3.1 Heat analysis
A heat analysis of each heat of steel shall be made by the manufacturer to determine compliance with the
requirements of Table 2. When requested, at the time of ordering, this analysis shall be reported to the purchaser or
his representative.
4.3.2 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. The sampling method and deviation limits shall be agreed upon between
the interested parties at the time of ordering.
4.4 Weldability
The product is normally suitable for welding if appropriate welding conditions are selected.
4.5 Application
It is desirable that the specified product be identified for fabrication by name of the part or by intended application.
Proper identification of the part may include visual examination, prints or description, or a combination of these.
4.6 Mechanical properties
At the time that the steel is made available for shipment, the mechanical properties shall be as stated in Table 1 or
Table 2 when they are determined on test pieces obtained in accordance with the requirements of clause 7.
NOTE Prolonged storage of the sheet may cause a change in the mechanical properties (increase in hardness and a
decrease in elongation) leading to an adverse effect on formability.
4.7 Surface condition
The condition of the surface of cold-reduced steel sheet is not required to be the same for unexposed parts as it is
for exposed parts.
Surface condition of sheet for unexposed parts may contain pores, some slight pitting, small markings, light
scratches and a light discoloration. The surface of sheet for exposed parts shall be reasonably free of these
conditions. Unless otherwise agreed, only one side is inspected.
4.8 Surface finish
Cold-reduced steel sheet is normally produced in a matt finish, dull in appearance, which is suitable for ordinary
decorative painting but is not recommended for electroplating.
When cold-reduced steel sheet is deformed during fabrication, localized areas may roughen to some degree and
such affected portions of the part may require hand finishing to prepare the surface for the intended application.
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ISO 14590:1999(E)
4.9 Oiling
As a deterrent to rusting, a coating of oil is usually applied to cold-reduced steel sheet. The oil is not intended as a
drawing or forming lubricant and shall be easily removable with degreasing chemicals. Cold-reduced steel sheet
may be ordered not oiled, if required, in which case, the supplier has limited responsibility if oxidation occurs.
5 Dimensional tolerances
5.1 Dimensional tolerances
See Tables 3 to 10, inclusive.
5.2 Restricted thickness tolerances
See Table 4.
6 Sampling
6.1 Tensile test
One representative sample for the tensile test required in Table 1 or Table 2 shall be taken from each lot of sheet
for shipment. A lot consists of 50 t or less of sheet of the same grade rolled to the same thickness and condition.
6.2 Bend test (when specified)
One representative sample for the bend test shall be taken from each lot of sheet for shipment. A lot consists of all
sheet of the same grade rolled to the same thickness and condition.
7 Mechanical property tests
7.1 Tensile test
The tensile test shall be carried out in accordance with the requirements of ISO 6892. Transverse test pieces shall
be taken midway between the centre and edge of the sheet as rolled.
7.2 Bend test (when specified)
The bend test piece shall withstand being bent as described in Table 1 or Table 2 and Figure 1, without cracking on
the outside of the bent portion. The bend test shall be carried out at ambient temperature in accordance with
ISO 7438.
Key
1 Rolling direction
Figure 1 — Transverse bend test piece (after bending)
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ISO 14590:1999(E)
8 Retests
8.1 General
If a test does not give the specified results, two or more pieces shall be taken at random from the same lot. Both
retests shall conform to the requirements of this International Standard; otherwise the lot may be rejected.
8.2 Machining and flaws
If any test piece shows defective machining or develops flaws, it shall be discarded and another test piece
substituted.
8.3 Additional tests
If a test does not give the specified results, two additional tests shall be carried out at random on the same lot. Both
retests shall conform to the requirements of this International Standard; otherwise, the lot may be rejected.
9 Resubmission
The manufacturer may resubmit for acceptance the products that have been rejected during earlier inspection
because of unsatisfactory properties, after he has subjected them to suitable treatment (selection, heat treatment)
which, on request, will be indicated to the purchaser. In this case, the tests shall be carried out as if they applied to
a new batch.
The manufacturer has the right to present the rejected products to a new examination for compliance with the
requirements for another grade.
10 Workmanship
The surface condition shall be that normally obtained on this product. The material in cut lengths shall be free from
amounts of lamination, surface flaws and other imperfections that are detrimental to the final product or to
subsequent appropriate processing. Processing for shipment in coils does not afford the manufacturer the
opportunity to observe readily or to remove imperfect portions as can be carried out on the cut length product.
11 Inspection and acceptance
While not usually required for products covered by this International Standard, when the purchaser specifies that
inspection and test for acceptance be observed prior to shipment from the manufacturer’s works, the manufacturer
shall afford the purchaser’s inspector all reasonable facilities to determine that the steel is being furnished in
accordance with this International Standard.
Steel that is reported to be defective after arrival at the user’s works, shall be set aside, properly and correctly
identified and adequately protected. The supplier shall be notified in order that he be able to properly investigate.
12 Coil size
When the product is ordered in coils, a minimum or range of acceptable inside diameter (I.D.) shall be specified. In
addition, the maximum outside diameter (O.D.) and the maximum acceptable coil mass shall be specified.
13 Marking
Unless otherwise stated, the following minimum requirements for identifying the steel shall be legibly stencilled on
the top of each lift or shown on a tag attached to each coil or shipping unit.
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ISO 14590:1999(E)
a) manufacturer’s name or identifying brand;
b) reference to this International Standard, i.e., ISO 14590;
c) the quality designation number and grade;
d) the order number;
e) the product dimensions;
f) the lot number;
g) the mass.
14 Information to be supplied by the purchaser
To specify adequately the requirements of this International Standard, inquiries and ord
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