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.
Technical Overview
Tube-making strip must meet strict dimensional requirements — thickness tolerance, width tolerance, and edge condition — since variations directly affect weld quality in the ERW forming process. IS 10748 specifies tighter tolerances than general HR strip standards. The material must have uniform mechanical properties along the coil length to ensure consistent forming in the tube mill. Surface quality requirements limit the depth of seams, laps, and scale pits that could cause weld defects. Chemical limits control carbon and sulphur for weldability and ductility.
Grades & Mechanical Properties
| Grade | Yield Strength (MPa) | Notes |
|---|---|---|
| YSt210 | ≥ 210 MPa | Light structural tubes, furniture, general sections |
| YSt240 | ≥ 240 MPa | Medium-strength ERW pipes — structural and mechanical tubing |
| YSt310 | ≥ 310 MPa | High-strength tubing — fluid transmission, structural hollow sections |
Values are minimum requirements unless otherwise stated. Always verify with the current edition of the standard and the mill test certificate.
Common Applications
- ERW pipes for water and gas distribution
- Structural hollow sections (SHS, RHS, CHS)
- Furniture tubing and scaffolding
- Mechanical tubing for agricultural equipment
- Irrigation pipes and sprinkler systems
International Equivalents
IS 1079
General purpose HR strip — IS 10748 is the tube-specific subset with tighter tolerances
EN 10016
European standard for rod for drawing — adjacent specification for drawn tube feedstock
Frequently Asked Questions
What is IS 10748 steel?
What is the difference between IS 10748 and IS 1079?
Related Standards
IS 1079:2017 — Hot Rolled Carbon Steel Sheet and Strip
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IS 2062:2011 — Hot Rolled Medium and High Tensile Structural Steel
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IS 1852:1985 — Rolling and Cutting Tolerances for Hot Rolled Steel Products
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