Circular Steel Tube Chemical Test
(IS 1978 / IS 3601 — Steel Tube Chemical Testing)
Chemical composition testing of circular steel tubes (line pipes, structural tubes, precision tubes) per IS 1978, IS 3601 and IS 9295 — verifying C, Mn, S, P, Si for grade and application compliance.
What is the Chemical Analysis — Circular Steel Tube?
Circular Steel Tube Chemical Analysis verifies the chemical composition of steel tubes used as line pipes (oil, gas, water), structural circular hollow sections (CHS) and precision tubes. Standards IS 1978 (line pipes), IS 3601 (tubes for mechanical and general engineering), IS 9295 (steel tubes for idlers) and IS 1239 (mild steel tubes) each specify composition limits for their respective grades.
At Global Lab, circular steel tube chemical analysis by OES covers all standard grades — confirming C, Mn, S, P, Si compliance and calculating Carbon Equivalent (CE) for weldability. Chemical analysis is especially important for high-pressure line pipes and structural tubes where a wrong grade could lead to catastrophic failure during service.
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Chemical Analysis — Circular Steel Tube — Site Images
How the Chemical Analysis — Circular Steel Tube is Conducted
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1
Surface Preparation
A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris. -
2
Insert Disc Placement
A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface. -
3
Hydraulic Pullout Force Application
A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface. -
4
Failure Load Recording
The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging. -
5
Strength Calculation & Reporting
The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 1978 | Specification for Line Pipe (welded and seamless) | Line Pipe | Indian Standard |
| IS 3601 | Steel Tubes for Mechanical and General Engineering Purposes | Engineering Tubes | Indian Standard |
| IS 1239 | Mild Steel Tubes and Tubulars | MS Tubes | Indian Standard |
| API 5L | Specification for Line Pipe | Line Pipe | API |