ISO 13976:2005

INTERNATIONAL ISO
STANDARD 13976
Second edition
2005-02-15

Hot-rolled steel sheet in coils of
structural quality and heavy thickness
Tôles fortes en acier de construction laminées à chaud en bobines




Reference number
ISO 13976:2005(E)
©
ISO 2005

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ISO 13976:2005(E)
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ISO 13976:2005(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 13976 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill
flat rolled products.
This second edition cancels and replaces the first edition (ISO 13976:1998), which has been technically
revised.

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INTERNATIONAL STANDARD ISO 13976:2005(E)

Hot-rolled steel sheet in coils of structural quality and heavy
thickness
1 Scope
1.1 This International Standard applies to hot-rolled carbon/manganese steel sheet of structural quality in
the grades listed in Tables 1 and 3, without the use of microalloying elements. The product is intended for
structural purposes where particular mechanical properties are required. It is generally used in the delivered
condition and is intended for bolted, riveted or welded structures. The product is produced on a wide strip mill.
1.2 This product is commonly produced in the range of thicknesses greater than 6 mm to 25 mm, and
widths of 600 mm and over, in coils.
1.3 This International Standard does not cover steels intended for boilers or pressure vessels, or steels
designated as commercial quality or drawing qualities, or steels rolled to cold-reduced products, or steels
designated as weathering steels, having increased atmospheric corrosion resistance, or those products rolled
on a plate mill.
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 148:1983, Steel — Charpy impact test (V-notch)
ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature
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 as compared with non-alloyed steel
produced to equivalent strength levels
3.2
hot-rolled steel sheet in coils
product obtained by rolling heated steel (billet or slab) through a continuous-type mill to the required strip
thickness and tolerances
NOTE The product has a surface covered with oxide or scale resulting from the hot-rolling operation.
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ISO 13976:2005(E)
3.3
hot-rolled descaled steel sheet in coils
hot-rolled steel sheet from the surface of which oxide or scale has been removed, commonly by pickling in an
acid solution
NOTE Descaling may also be performed by mechanical means such as grit blasting. Some increase in hardness and
some loss of ductility may result from descaling.
3.4
mill edge
a normal edge produced without any definite contour produced in hot-rolling
3.5
sheared edge
a normal edge obtained by shearing, slitting or trimming a mill edge product
NOTE Normal processing does not necessarily provide a definite positioning of the slitting burr.
4 Conditions of manufacture
4.1 Steelmaking
Unless otherwise agreed upon by the interested parties, the processes used in making the steel and in
manufacturing hot-rolled 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 Tables 1 and 2.
Table 1 — Chemical composition (heat analysis)
C Mn P S Si N
Grade
max. max. max. max. max. max.
% % % % % %
HR185 0,16 1,5 0,030 0,035 0,40 0,015
HR235 0,18 1,5 0,030 0,035 0,40 0,015
HR275 0,18 1,5 0,030 0,035 0,40 0,015
HR295 0,21 1,5 0,030 0,035 0,55 0,015
HR325 0,18 1,6 0,030 0,035 0,55 0,015
HR355 0,22 1,5 0,030 0,035 0,55 0,015


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ISO 13976:2005(E)
Table 2 — Limits on additional chemical elements


a a a,b a,b c
Cu Ni Cr Mo Nb V Ti
Element max. max.
max. max. max. max. max.
% % % % % % %
c
Heat analysis 0,20 0,20 0,15 0,06 0,008 0,008 0,008
Product analysis 0,23 0,23 0,19 0,07 0,018 0,018 0,018
NOTE Each of the elements listed in this table 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 %.
a
The sum of copper, nickel, chromium and molybdenum shall not exceed 0,50 % on the 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 is
specified, the sum does not apply, in which case, only the individual limits on the remaining elements will apply.
c
Where residual V levels greater than 0,008 % occur due to high levels of V in natural ores, such material may be supplied after
agreement between the producer and consumer.

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 Tables 1 and 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. Non-killed steels (such as rimmed or capped) are not
technologically suited to product analysis. For killed steels, the sampling method shall be agreed upon
between the interested parties at the time of ordering. The product analysis tolerances shall be in accordance
with Table 3.
Table 3 — Product analysis tolerances
Element Maximum of specified element, % Tolerance over maximum specified, %
Carbon 0,04
> 0,15 to u 0,40
Manganese 0,05
> 1,15 to u 1,65
Phosphorus u 0,04 0,010
Sulfur u 0,06 0,010
Silicon > 0,30 to u 0,60 0,05
Nitrogen u 0,030 0,005
NOTE The above maximum tolerance is the allowable excess over the specified requirement and not the heat analysis. For
example: for Grade HR295, the following product analysis values are within these tolerances: C 0,25 %, Mn 1,55 %, P 0,040 %,
S 0,045 %, Si 0,60 %, 0,020 %.

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ISO 13976:2005(E)
4.4 Weldability
This product is suitable for welding if appropriate welding conditions are selected. For undescaled steel, it may
be necessary to remove the scale or oxide, depending upon the welding method. When the carbon content
rises above 0,15 %, welding becomes increasingly difficult.
4.5 Application
It is desirable that the specified product be identified for fabrication by the name of the part or by intended
appli
...