IS 1079:2017 specifies hot rolled carbon steel sheets and strips for general engineering purposes. It defines four commercial grades — HR1 through HR4 — based on forming characteristics, covering thicknesses from 1.6mm to 10mm in sheet form and strips up to 600mm wide. It is the foundational standard for the hot rolled coil and sheet supply chain in India.
Technical Overview
IS 1079 covers uncoated hot rolled steel in sheet and strip form intended for general structural and engineering applications where tight dimensional tolerance is not critical. HR1 is the commercial quality grade suitable for bending, punching, and general fabrication. HR2 is drawing quality, suited for moderate press forming. HR3 and HR4 are for more demanding drawing operations. The standard specifies surface finish classes, allowable defects, coil dimensions, and mechanical property ranges. Most Indian HR coils traded under this standard are tested to IS 1079 and IS 2062 simultaneously, and mill test certificates reference both.
Grades & Mechanical Properties
| Grade | Notes |
|---|---|
| HR1 | Commercial quality — general engineering, fabrication, bending |
| HR2 | Drawing quality — moderate press forming, auto parts |
| HR3 | Deep drawing quality — more demanding forming operations |
| HR4 | Extra deep drawing — complex shapes, highest formability |
Values are minimum requirements unless otherwise stated. Always verify with the current edition of the standard and the mill test certificate.
Common Applications
- General fabrication — enclosures, frames, supports
- Automotive body panels and chassis components
- Agricultural equipment and machinery guards
- Furniture and storage racking
- Roofing and cladding substrate (pre-painted)
- Pipe and tube manufacturing (as skelp)
International Equivalents
EN 10111
European equivalent — continuously hot rolled low carbon steel for forming
ASTM A1011
US equivalent for HR sheet and strip, structural and forming grades
JIS G3131 SPHC
Japanese commercial quality HR sheet, widely referenced
Frequently Asked Questions
What is IS 1079 steel?
What is the difference between IS 1079 and IS 2062?
What thickness range does IS 1079 cover?
What is HR1 grade in IS 1079?
Related Standards
IS 2062:2011 — Hot Rolled Medium and High Tensile Structural Steel
IS 2062 is India's primary structural steel standard, specifying hot rolled medium and high tensile steel used in bridges, buildings, industrial structures, and fabricated assemblies. It defines six grades from E250 to E550, covering mild to high tensile performance. Published by the Bureau of Indian Standards (BIS), it is the most referenced steel specification in Indian construction and engineering.
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IS 513:2008 — Cold Rolled Low Carbon Steel Sheets and Strips
IS 513:2008 is the Bureau of Indian Standards specification for cold rolled low carbon steel sheets and strips. It defines five grades (CR1 to CR5) based on formability — from commercial quality for general fabrication to ultra deep drawing quality for complex press-formed components. CR steel is characterised by its smooth surface finish, tighter dimensional tolerance, and superior formability compared to HR equivalents.
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IS 1852:1985 — Rolling and Cutting Tolerances for Hot Rolled Steel Products
IS 1852:1985 is the BIS standard governing rolling and cutting tolerances for all hot rolled steel products — plates, sheets, strips, flats, bars, and structural sections. It specifies the permitted deviation from nominal dimensions for thickness, width, length, flatness, camber, and squareness. IS 1852 is the tolerance reference document used alongside IS 2062 and IS 1079 in purchase orders and inspection protocols — any dimension check at goods receipt references IS 1852.
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IS 10748:2004 — Hot Rolled Steel Strip for Welded Tubes and Pipes
IS 10748:2004 specifies hot rolled steel strip used as the skelp (feedstock) for the manufacture of welded (ERW and HFI) tubes and pipes. It defines three yield-strength-based grades — YSt210, YSt240, and YSt310 — for pipe skelp in thicknesses from 1.6mm to 10mm. It is the foundational material standard for India's substantial ERW pipe manufacturing industry.
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