Is 1079 - 2009
Is 1079 - 2009
Is 1079 - 2009
Indian Standard
HOT ROLLED CARBON STEEL SHEET AND STRIP -
SPECIFICATION
( Sixth Revision )
ICS 77.140.50
BIS 2009
BUREAU OF I N D I A N STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
FOREWORD
This Indian Standard (Sixth Revision) was adopted by the Bureau of Indian Standards, after the draft
finalized by the Wrought Steel Products Sectional Committee had been approved by the Metallurgical
Engineering Division Council.
This standard was first published in 1958 and subsequently revised in 1962, 1968, 1973, 1988 and
1994. While reviewing this standard, in the light of experience gained during these years, the
Committee decided to revise it to bring in line with the present practices being followed by the Indian
industry and overseas standards of hot rolled carbon steel sheets.
In this revision the following changes have been made:
a) Chemical and mechanical properties have been modified;
b) Clauses 3.2, 3.3, 8, 11 and 16.1 have been modified;
c) New grades HRO and HR5 have been added;
d) Amendments No. 1, 2, 3 and 4 have been incorporated;
e) A new clause on references has been incorporated;
f) International grades designation system has been adopted, simultaneously old designations
have also been given; and
g) Requirements of dimensions and tolerances have been separated from the standard and
adopted in IS/ISO 16160 : 2005 'Continuously hot-rolled steel sheet productsDimensional
and shape tolerances'.
For ail the tests specified in this standard (chemical/physical/others), the method as specified in
relevant ISO Standard may also be followed as an alternate method.
While revising the standard assistance has been derived from ISO 3573 : 1999 'Hot rolled carbon steel
sheet of commercial and drawing qualities'.
The composition of the Committee responsible for the formulation of this standard has been given in
Annex A.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final
value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in
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accordance with IS 2 : 1960 'Rules for rounding off numerical values (revised) . The number of
significant places retained in the rounded off value should be the same as that of the specified value in
this standard.
IS 1079 : 2009
Indian Standard
HOT ROLLED CARBON STEEL SHEET AND STRIP
SPECIFICATION
( Sixth Revision )
1 SCOPE supplied either with mill edges or flattened and
sheared edges.
This standard covers the requirements for hot rolled
low carbon steel sheets and strips intended for 4 GRADES
forming, drawing and general engineering purposes.
There shall be 6 grades of hot rolled carbon steel
2 REFERENCES sheet and strip designated as follows:
The following standards contain provisions, which a) HR0 Ordinary.
through reference in this text, constitute provisions b) HR1 Commercial quality intended for
of this standard. At the time of publication, the general fabrication purposes where sheets or
editions indicated were valid. All standards are strips are used in the flat or for bending,
subject to revision and parties to agreements based moderate forming and welding operations.
on this standard are encouraged to investigate the
possibility of applying the most recent editions of c) HR2 Drawing quality Intended for
the standards indicated below: applications where drawing, severe forming
and welding are involved.
IS No. Title d) HR3 Deep drawing quality.
228 (In- various parts) e) HR4 Extra deep drawing quality.
Method for chemical
analysis of steel f) HR5 Micro alloyed.
1599 : 1985 Method for bend test 5 MANUFACTURE
(second revision)
1608 : 2005 Metallic materials 5.1 Steel shall be manufactured by any process of
Tensile testing at ambient steel making at the discretion of the manufacturer.
temperature (third revision) 5.2 Steel sheets and strips shall be supplied in the
1730 : 1989 Dimensions for steel plates, rimmed, semi-killed or killed condition as agreed to
sheets, strips and flats for between the purchaser and the manufacturer.
general engineering However, HR4 and HR5 grades shall be supplied in
purposes (second revision) killed condition only.
8910 : 1978 General technical delivery 5.3 Steels which are fully aluminium killed shall be
requirements for steel and capable of withstanding a stabilization or ageing test
steel products when cold rolled annealed and skin passed.
10175 (Part 1) : 1993 Mechanical testing of
metalsModified Erichson 6 CHEMICAL COMPOSITION
cupping test sheet and strip: 6.1 Ladle Analysis
Part 1 Thickness up to 2 mm
(first revision) Ladle analysis of the material when carried out either
IS/ISO 16160 : 2005 Continuously hot-rolled by the method specified in the relevant part of IS 228
steel sheet products or any other established instrumental/chemical
Dimensional and shape method, shall be as given in Table 1. In case of
tolerances dispute, the procedure given in the relevant part of
IS 228 shall be the referee method.
3 SUPPLY OF MATERIAL
6.2 Product Analysis
3.1 General requirements relating to the supply of
hot rolled carbon steel sheets and strips shall Permissible variations in case of product analysis
conform to IS 8910. from the limits specified in Table 1 shall be as given
in Table 2.
3.2 Hot rolled carbon steel sheets and strips shall be
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IS 1079 : 2009
Table 1 Chemical Composition
(Clauses 6.1 and 6.2)
NOTES
1 Steels of these grades can be supplied with the addition of micro-alloying elements like Boron, Titanium, Niobium
and Vanadium- The micro-alloying elements shall not exceed 0.008 percent in case of Boron and 0.20 percent in case of
other elements.
2 The Nitrogen content of the steel shall not be more than 0.007 percent. However, for Aluminium killed or
Silicon-Aluminium killed, the Nitrogen content shall not exceed 0.012 percent This has to be ensured by the manufacturer
by occasional check analysis.
3 Grades HR4 and HR5 shall be supplied in fully Aluminium killed condition or Aluminium with stabilizing elements.
4 When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent. When the steel is
silicon killed, the silicon content shall not be less than 0.10 percent When the steel is Aluminium silicon killed, the silicon
content shall not be less than 0.03 percent and total Aluminium content shall not be less than 0.01 percent.
5 When copper bearing steel is required the copper content shall be between 0.20 and 0.35 percent. In case- of product
analysis, the copper content shall be between 0.1? and 0.38 percent.
6 Restricted chemistry may be mutually agreed to between the purchaser and the supplier.
1) Denotes that dual phase steel may also contain Cr and Mo up to 1.0 percent.
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IS 1079 : 2069
Table 3 Tensile Properties
(Clauses 7.3 and 73.1)
NOTES
1 IMPa = 1N/ram2.
2 Tensile testing is not mandatory for HR1, unless agreed to between the purchaser and the manufacturer.
1) Minimum tensile strength for qualities HRl, HR2, HR3 and HR4 would normally be expected to be 270 MPa. Where
minimum tensile strength is required, the value of 270 MPa may be specified. All tensile strength values are determined to
the nearest 10 MPa.
2) The non-proportional test piece with a fixed original gauge length (50 mm), up to 6 mm thick sheet can be used in
conjunction with a conversion table. In case of dispute, however, only die results obtained on a proportional test piece will
be valid for material 3 mm and over in thickness.
3) Where V is thickness of steel sheet, in mm.
* Properties on mutual agreement between the purchaser and the manufacturer.
may be carried out only for sheets and strips of HR2, 12.2 Edges may be mill edges or slit edges as agreed
HR3 and HR4 grades having thickness from 0.5 mm to between the supplier and purchaser. When mill
up to 2 mm, if agreed to between the purchaser and edges are specified, the depth of the defects shall be
the supplier. within 5 mm from the edges of the coils on both
9.2 The cupping test values shall be agreed upon sides.
between the purchaser and the supplier.
13 DIMENSIONS AND TOLERANCES
10 STRAIN AGEING TEST 13.1 Dimensions of steel sheet and strip shall conform
10.1 The test is to be carried out on grades where to the dimensions specified in IS 1730.
steel is supplied with non-ageing properties/ 13.2 Unless otherwise agreed the dimensional
guarantee. This shall be agreed to between the tolerances for hot-rolled steel sheet shall be as given in
purchaser and the supplier.,, IS/ISO 16160.
13.2.1 Unless otherwise agreed the restricted
10.2 Selection of Sample thickness tolerances shall be as given m IS/ISO
The sample shall be selected in such a way that the 16160.
axis of bend is parallel to the direction of final rolling. 14 CALCULATION OF WEIGHT
In case of material too narrow to permit this, the axis
of bend shall be of 90 to the direction of rolling. The mass of the material shall be calculated on the
10.3 Size of test piece shall be as follows: basis that steel weighs 7.85 g/cm2.
Thickness Size
15 DELIVERY
Below 3 mm 75 mm long and 25 mm wide
3 mm and above 75 mm long and 40 mm wide 15.1 The material may be supplied in any one (or,
in combination) of the following conditions subject
For lower width, the maximum obtainable width to mutual agreement between the supplier and the
shall be taken. purchaser:
The edges of the test pieces shall be rounded or a) Hot rolled,
smoothened longitudinally to an approximate
b) Annealed,
semicircle.
c) Normalized, and
10.4 The test piece shall be bent cold through 90
d) Descaled
over a radius equal to one and a half times the
thickness, about an axis at right angles to the length 15.2 Subject to prior agreement between the
of the test piece. Then the piece shall be heated at manufacturer and the purchaser, a suitable
100C for 1 h (or at 325 to 350C for 15 min) and protective treatment may be given to the material.
the sample cooled. The test piece shall be flattened
by hammer and the piece shall not develop crack 16 MARKING
near the bend.
16.1 Sheets shall be supplied in bundles, and strips
11 RETEST either in bundles or coils. Each bundle shall carry a
If a test does not give the specified results, two metal tag bearing the cast number and the,
additional tests shall be carried out at random on the manufacturer's name or trade-mark. Alternatively,
same lot. Both retests shall conform to the me top sheet or strips in each bundle shall be legibly
requirements of this standard, otherwise, the lot shall marked with the cast number, name of the
be rejected. manufacturer or trade-mark.
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IS 1079 : 2009
ANNEX A
(Foreword)
COMMITTEE COMPOSITION
Wrought Steel Products Sectional Committee, MTD 4
Member Secretary
SHRI DEEPAK IAIN
Scientist 'E' (MTD), BIS
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IS 1079 : 2009
Flat Steel Products Subcommittee, MTD 4 : 3
Organization Representative(s)
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MGIPF-253 Daptt. Of BIS/2009--5.8.2009 --300 Books.
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act', 1986 to promote harmonious
development of the activities of standardization, marking and quality certification of goods and attending to
connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without
the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the
standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to
copyright be addressed to the Director (Publications), BIS.
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of
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BIS Catalogue' and 'Standards : Monthly Additions'.
This Indian Standard has been developed from Doc No.: MTD 4 (4730).