What are the common steel grades defined in this standard?

YSt 210, YSt 240, and YSt 310, which denote minimum yield stress in MPa.

Are circular hollow sections (CHS) covered under IS 4923?

No, IS 4923 only covers square and rectangular sections. CHS are covered by IS 1161.

IS 4923

: 1997

Hollow Steel Sections for Structural Use - Specification

CurrentFrequently UsedSpecificationBIMStructural Engineering · Steel and Reinforcement

Specifies the dimensions, mass, tolerances, mechanical properties, and chemical composition for square and rectangular hollow steel sections (SHS and RHS) used in structural applications.

Specifies requirements for cold formed and hot finished hollow steel sections for structural use.

Quick Reference Values

Yield Stress (YSt 210)210 MPa

Yield Stress (YSt 240)240 MPa

Yield Stress (YSt 310)310 MPa

Mass tolerance (individual length)+10%, -8%

Mass tolerance (10-tonne lot)± 7.5%

Squareness tolerance of corners90° ± 2°

Thickness tolerance (all sizes)± 10%

Practical Notes

Ensure the correct grade (YSt 210, 240, 310) is specified based on the structural design requirements.

Circular hollow sections are not covered by this standard; refer to IS 1161 for them.

When designing compression members using these sections, account for appropriate buckling curves in IS 800 due to cold-forming residual stresses.