ASTM A36 Structural Carbon Steel Square Tube

ASTM A36 structural carbon steel square tube (SHS Square Hollow Section) is manufactured in full compliance with ASTM A36/A36M specification for carbon structural steel. Both ERW cold‑formed welded and seamless extruded versions are available. Featuring neat square cross‑sections and well‑controlled dimensional tolerances, it ranks as a widely‑adopted hollow structural profile for overseas infrastructure, steel construction and mechanical fabrication projects. No heat treatment is required to achieve stable mechanical performance. It fits bolting, riveting and all common welding procedures. Multiple surface finishes are offered including black hot‑rolled, oiled, hot‑dip galvanized and painted. Mill test certificate EN10204‑3.1 is supplied to meet project acceptance requirements across North America and worldwide markets.

Balanced structural mechanical performance

Minimum yield strength ≥250 MPa (36 ksi), tensile strength ranging from 400‑550 MPa, minimum elongation ≥20%. Balanced stiffness and ductility resist load, impact and deformation without brittle fracture, ideal for static and moderate dynamic‑load conditions to avoid unexpected structural distortion.

Excellent on‑site fabrication performance

Low‑carbon chemistry delivers low carbon equivalent and consistent weld quality. The material supports cutting, hole‑punching, bending and grinding with minimal cracking risk, shortening pre‑fabrication and site‑erection time for mass component production.

High section efficiency & cost competitiveness

Hollow square geometry delivers strong bending and torsion resistance at lower self‑weight compared with solid steel sections, reducing material consumption and transportation cost. Proven mass‑production technology and comprehensive size portfolio bring stable budgeting for your projects.

Flexible custom supply 

Standard lengths 6 m /12 m or custom cut‑to‑length. Pipe ends can be plain or beveled. Special tolerances, additional inspection items and custom anti‑corrosion finishes are available against project specifications.

Steel building frames, factory columns & beams, outdoor structural supports, bridge secondary components, machinery bases & frames, storage racking, greenhouse steel structures, guardrail posts, auxiliary container structures and general‑purpose industrial support frameworks.

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