ISO 4997:2007
(Main)Cold-reduced carbon steel sheet of structural quality
Cold-reduced carbon steel sheet of structural quality
ISO 4997:2007 applies to cold-reduced steel sheet of structural quality in grades CR220, CR250, CR320 and CH550, usually without the use of microalloying elements. The product is intended for structures that may include bolting, riveting and welding. It is generally used in the delivered condition for fabricating purposes, such as bending, forming or welding. ISO 4997:2007 does not cover steels designated as commercial quality or drawing qualities (covered in ISO 3574:1999), cold-reduced carbon steel sheet according to hardness requirements (covered in ISO 5954:1998), cold-reduced steel sheet of higher strength with improved formability (covered in ISO 13887:2004), or cold-reduced steel sheet of high tensile strength and low yield point with improved formability (covered in ISO 14590:2005).
Tôles en acier au carbone laminées à froid, de qualité destinée à la construction
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4997
Fourth edition
2007-03-15
Cold-reduced carbon steel sheet of
structural quality
Tôles en acier au carbone laminées à froid, de qualité destinée à la
construction
Reference number
ISO 4997:2007(E)
©
ISO 2007
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ISO 4997:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 4997:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Conditions of manufacture . 2
5 Dimensional tolerances . 5
6 Tensile-test sampling . 5
7 Tensile test . 6
8 Retests . 6
9 Resubmission . 6
10 Workmanship . 6
11 Inspection and acceptance. 6
12 Coil size . 7
13 Marking . 7
14 Information to be supplied by the purchaser . 7
Bibliography . 8
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ISO 4997:2007(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 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 4997 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 4997:1999), which has been technically revised.
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INTERNATIONAL STANDARD ISO 4997:2007(E)
Cold-reduced carbon steel sheet of structural quality
1 Scope
This International Standard applies to cold-reduced steel sheet of structural quality in grades CR220, CR250,
CR320 and CH550, usually without the use of microalloying elements. The product is intended for structures
that may include bolting, riveting and welding. It is generally used in the delivered condition for fabricating
purposes, such as bending, forming or welding.
This product is commonly produced in thicknesses from 0,36 mm up to 3 mm and in widths of 600 mm and
over, in coils and cut lengths.
Cold-reduced sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.
This International Standard does not cover steels designated as commercial quality or drawing qualities
(covered in ISO 3574), cold-reduced carbon steel sheet according to hardness requirements (covered in
ISO 5954), cold-reduced steel sheet of higher strength with improved formability (covered in ISO 13887), or
cold-reduced steel sheet of high tensile strength and low yield point with improved formability (covered in
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, Metallic materials — Tensile testing at ambient 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
microalloying elements
elements such as niobium, vanadium, titanium, etc, added singly or in combination to obtain higher strength
levels combined with better formability, weldability and toughness compared to non-alloyed steels produced to
equivalent strength levels
3.2
cold-reduced steel sheet (grades CR220, CR250 and CR320)
product obtained from hot-rolled descaled steel sheet by cold reducing to the required sheet thickness
followed by annealing to recrystallize the grain structure
NOTE 1 This annealed product is normally supplied skin-passed (see 3.3) but may be supplied annealed-last
(i.e. without a skin pass), if specified by the purchaser on his order.
NOTE 2 CH550 is a product which has not been annealed after reduction to the specified thickness.
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ISO 4997:2007(E)
3.3
skin pass (except grade CH550)
light cold rolling of the product
NOTE 1 The purpose of 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 the required surface finish.
NOTE 2 Some increase in hardness and some loss in ductility will result from skin passing.
4 Conditions of manufacture
4.1 Steelmaking
The processes used in making the steel and in manufacturing cold-reduced 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
Table 1 — Chemical composition (heat analysis), %
Contents in percent
Method of C Mn P S
Grade Class
deoxidation
max. max. max. max.
B E or NE 0,15 Not applicable 0,035 0,035
CR220
D CS 0,15 Not applicable 0,035 0,035
B E or NE 0,20 Not applicable 0,035 0,035
CR250
D CS 0,20 Not applicable 0,035 0,035
B E or NE 0,20 1,50 0,035 0,035
CR320
D CS 0,20 1,50 0,035 0,035
CH550 Not applicable Not applicable 0,20 1,50 0,035 0,035
E = Rimming
NE = Non-rimming
CS = Aluminum killed
NOTE 1 The nitrogen content is controlled; normally it should not exceed 0,009 % for E or NE steel or 0,015 % for CS steel.
NOTE 2 Class B steels are intended for use in welded structures or structural parts, subjected to normal loading conditions.
NOTE 3 Class D steels are to be used for structures or structural parts where, owing to loading conditions and the general design
of the structure, a high resistance to brittle fracture is necessary.
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ISO 4997:2007(E)
Table 2 — Limits on additional chemical elements
Contents in percent
Heat analysis Product analysis
Elements
max. max.
a
Cu 0,20 0,23
a
Ni 0,20 0,23
a, b
Cr 0,15 0,19
a, b
Mo 0,06 0,07
c
Nb 0,008 0,018
c
V 0,008 0,018
c
Ti 0,008 0,018
a
The sum of copper, nickel, chromium, and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these
elements is specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.
b
The sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are
specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply.
c
Analysis greater than 0,008 may be supplied after agreement between the producer and consumer.
4.3 Chemical analysis
4.3.1 Heat analysis
An analysis of each heat of steel shall be made by the manufacturer to determine compliance with the
requirements given in Tables 1 and 2. When requested, the heat analysis shall be reported to the purchaser
or his representative.
Each of the elements listed in Table 2 shall be included in the report of the heat analysis. When the amount of
copper, nickel, chromium or molybdenum present is less that 0,02 %, the analysis may be reported at
“< 0,02 %”.
4.3.2 Product analysis
A product analysis may be made by the purchaser to verify the specified analysis of the semi-fi
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