NABL Accredited · Metal Chemical Testing
Chemical Analysis — Square & Rectangular Hollow Sections
(IS 4923 — SHS / RHS Chemical Testing)
Chemical composition testing of square hollow sections (SHS) and rectangular hollow sections (RHS) per IS 4923 — verifying C, Mn, S, P, Si for Grades YST 210, YST 240, YST 310 compliance in structural applications.
IS 4923
Standard
±0.01%
Accuracy
3 Days
Report TAT
NABL
Accredited
NABL Accredited Lab · ISO/IEC 17025:2017
Digital Reports via Autovity QLMS
Pan-India · 7 Lab Locations
Est. 2009 · 20,000+ Projects
Overview
What is the Chemical Analysis — Square & Rectangular Hollow Sections?
Square and Rectangular Hollow Sections (SHS/RHS) per IS 4923 are widely used in structural steel fabrication — building frames, industrial sheds, trusses, bridges and furniture. IS 4923 specifies three yield strength grades: YST 210 (yield ≥210 MPa), YST 240 (≥240 MPa) and YST 310 (≥310 MPa) — each with specific chemical composition limits for C, Mn, S and P.
At Global Lab, SHS/RHS chemical analysis by OES verifies the composition per IS 4923 — Grade YST 210 (C ≤0.20%, Mn ≤1.30%), YST 240 (C ≤0.20%, Mn ≤1.50%) and YST 310 (C ≤0.22%, Mn ≤1.60%). Chemical grade verification is increasingly important as lower-grade hollow sections are misrepresented as YST 310 to meet structural design requirements.
Non-Destructive
Minimal surface preparation. Structure integrity is preserved throughout testing.
Fast Turnaround
On-site results within hours. Digital reports dispatched within 24 hours.
NABL Certified
All test and calibration results are backed by traceable measurements and standardized procedures.
Pan-India Coverage
Site engineers deployed across 7 lab locations and all major project sites.
Digital Reporting
Access reports anytime via Autovity QLMS client dashboard — zero paperwork.
High Accuracy
Results correlated to cube compressive strength with ±2% precision range.
Test in Action
Chemical Analysis — Square & Rectangular Hollow Sections — Site Images
SHS/RHS Wall Section Ground for OES Analysis
Spark Spectrometer — IS 4923 Grade YST 210/240/310
Carbon Equivalent Calculated for Weldability
Test Procedure
How the Chemical Analysis — Square & Rectangular Hollow Sections is Conducted
-
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.
Standards & Specifications
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 4923 | Hollow Steel Sections for Structural Use — Specification | SHS/RHS Standard | Indian Standard |
| IS 2062 | Hot Rolled Medium and High Tensile Structural Steel | Structural Reference | Indian Standard |
| IS 6285 | Methods for Chemical Analysis of Carbon and Low Alloy Steels | Test Method | Indian Standard |
| EN 10219 | Cold Formed Welded Structural Hollow Sections | European Standard | European Standard |
Applications
Where is the Chemical Analysis — Square & Rectangular Hollow Sections Used?
Structural frame fabrication SHS/RHS grade compliance for industrial buildings
Truss and portal frame structural hollow section chemical verification
Pre-engineered building (PEB) hollow section procurement quality control
Furniture and modular shelving hollow section grade verification
Import quality control of hollow sections from overseas suppliers
Forensic investigation of collapsed shed frames — incorrect grade identification
Why Choose Global Lab
Our Advantages
NABL Accredited ReportsLegally valid IS 4923 chemical certificates for structural fabrication projects.
YST Grade Fraud PreventionChemical analysis prevents use of sub-grade sections in structural applications.
CE for WeldingCarbon equivalent ensures safe welded frame fabrication.
Fast 3-Day ReportFull OES analysis and NABL report within 3 working days.
Pan-India CoverageMetal chemical testing at all 7 NABL-accredited lab locations.
Combined SHS/RHS TestingChemical + mechanical (tensile, bend) testing offered together.