AST PIPES YST 310 Square Hollow Section AST YST 310 MS SHS - (70 x 70 x 4.5 mm) - 6 mtr Length is manufactured by ERW cold-forming to IS 4923:2017, with a 70 mm square cross-section, 4.5 mm wall thickness, and standard 6 m cut length. Delivering 310 MPa yield and 450 MPa tensile strength, this SHS is designed for heavy structural, high-load bearing and column applications where dimensional accuracy and weld quality are paramount. Its four flat external faces offer maximum bearing area for connections, gussets, and base plates in structural steel assemblies.

• Grade YST 310 IS 4923:2017 certified SHS with guaranteed mechanical properties
• ERW process producing a continuous, sound weld seam along the full tube length
• Yield strength of 310 MPa and tensile strength of 450 MPa for design-critical applications
• Square hollow geometry offering excellent column action under axial compression
• Equal section modulus about both axes enabling multi-directional load resistance
• Mill surface suitable for direct fabrication, painting, or hot-dip galvanizing
• Available in a wide range of sizes from small profiles to large structural sections
• Standard 6 m lengths compatible with standard transport and storage infrastructure
• Good notch toughness and elongation properties for structural safety under impact
• Dimensional accuracy per IS 4923 tolerances ensuring interchangeable fit-up

• Primary structural frame columns in warehouses and distribution centres
• Long-span truss members in airport terminals and exhibition halls
• Heavy structural framing in power stations and process facilities
• Structural sections for oil and gas platform topsides and jacket frames
• Rail over-bridges and road bridge primary structural beam members
• Heavy crane gantry columns and crane main girder structural sections
• Primary structural members in stadiums, arenas, and grandstand roofs
• Structural hollow sections in high-rise building cores and perimeter frames