Circular Steel Tube for Structural Purpose — Testing(IS 1161:2014)
Mechanical and weld-integrity testing of circular hollow steel tubes per IS 1161:2014 — tensile strength, flattening test and dimensional verification across YSt210 to YSt355 grades.
What is Circular Steel Tube Structural Testing?
Circular hollow steel tubes to IS 1161:2014 are used in tubular trusses, towers, columns, space frames, sheds, handrails and scaffolding. The standard classifies material by mechanical properties across four grades — YSt210, YSt240, YSt310 and YSt355 — each with defined minimum yield strength, tensile strength and elongation, alongside dimensional tolerances on outside diameter, wall thickness and straightness.
Global Lab verifies circular structural tubes against IS 1161:2014 with a tensile test to confirm the grade's yield and ultimate strength requirements, a flattening test on welded tube to verify weld-seam integrity and ductility, and dimensional checks on outside diameter and wall thickness. Chemical composition can be verified alongside where the project specification requires full material certification.
Circular Steel Tube for Structural Purpose — Testing — Site Images
How the Circular Steel Tube for Structural Purpose — Testing is Conducted
- 1
Sample Selection & Dimensional Check
A representative tube length is sampled and checked for outside diameter, wall thickness and straightness against IS 1161:2014 tolerances. - 2
Tensile Coupon Preparation
A tensile test piece is cut from the tube body, excluding the weld seam, per IS 1161:2014 sampling rules. - 3
Tensile Testing
The coupon is loaded in a calibrated UTM to verify yield strength, ultimate tensile strength and elongation against the declared YSt grade. - 4
Flattening Test
A ring specimen including the weld seam is flattened between platens to the specified distance, and the weld is inspected for cracking to verify seam integrity. - 5
Reporting
Tensile, flattening and dimensional results are compiled into a NABL-accredited report confirming compliance with the declared grade, issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 1161:2014 | Steel Tubes for Structural Purposes — Specification | Mechanical Properties (YSt210–YSt355), Weld Integrity | Indian Standard |