Conforming to IS 4923:2017 Grade YST 310, the AST PIPES MS SHS AST YST 310 MS SHS - (135 x 135 x 4.5 mm) - 6 mtr Length is a precision cold-formed square hollow section featuring 135 mm outer dimensions and 4.5 mm wall thickness across a 6 m mill length. This ERW-welded section achieves a minimum yield of 310 MPa and UTS of 450 MPa, making it reliable for heavy structural, high-load bearing and column applications. The symmetric closed profile enhances stiffness-to-weight ratio and enables clean, consistent welds on all four faces of the section.

• Cold-formed ERW square hollow section to IS 4923:2017 Grade YST 310
• Four flat external faces providing maximum bearing area for connection hardware
• Minimum 310 MPa yield and 450 MPa UTS meeting structural design requirements
• Precise square geometry enabling flush-face connections without packing plates
• Consistent internal dimensions suitable for sleeve joints and end-plate connections
• Surface free from major rolling defects for seamless paint or galvanizing adhesion
• 6 m standard length for efficient stacking, handling, and transportation logistics
• Suitable for cold punching, drilling, sawing, and plasma cutting on-site
• Closed cross-section superior to open sections in torsion-critical applications
• Produced under controlled rolling and forming conditions for batch-to-batch consistency

• High-strength structural columns in multi-storey steel construction
• Main chord members in heavy roof trusses and long-span structures
• Industrial chimney, stack, and flare tower structural bracing members
• Structural columns in composite concrete-filled tube (CFT) construction
• Heavy conveyor gallery primary structural framing and support members
• Primary structural sections in shipbuilding and marine fabrications
• High-load industrial shelving uprights and heavy racking structures
• Structural portal frame columns and rafters in large industrial buildings