AST PIPES presents the AST YST 310 250 NB MS CHS - (273 x 5.9 mm) - 6 mtr Length, a premium ERW Circular Hollow Section in YST 310 mild steel produced to IS 1161:2014 (Steel Tubes for Structural Purposes). The 273 mm OD × 5.9 mm wall (250 NB) circular profile in 6 m lengths combines a guaranteed yield of 310 MPa and tensile of 450 MPa with a smooth mill-finish surface for heavy-duty structural, high-load, and long-span applications. As a large-bore circular section designed for major structural columns, crane structures, and heavy industrial frameworks, the equal-axis geometry eliminates orientation-specific detailing, streamlining design, fabrication, and erection for columns, struts, truss members, and architectural tubes.

• Minimum yield: 310 MPa | Minimum tensile: 450 MPa — as per IS 1161:2014
• Circular cross-section 273 mm OD with 5.9 mm wall: maximum yield strength enabling slender, efficient circular sections under heavy combined loads
• IS 1161:2014 compliance with IS marking — guaranteed structural quality assurance
• Cold-formed process for tight dimensional tolerances and superior roundness control
• Standard 6 m lengths compatible with modular structural and architectural grid spacings
• Suitable for hot-dip galvanising, electrostatic powder coating, and intumescent fire treatment
• Equal bending resistance in all planes — no orientation-specific design or detailing required
• Compatible with standard weld-on flanges, end caps, saddle clamps, and rosette connections
• Prime HR coil input ensuring uniform grain structure and consistent mechanical properties
• Batch-identifiable tubes for quality traceability throughout the project lifecycle

• Industrial plant pipe racks, equipment skid frames, and reactor support structures
• Mining equipment frames, conveyor gantry columns, and ore-handling structure legs
• Crane runway columns, gantry uprights, and jib crane mast sections
• Shipbuilding and marine structural tubulars for hull and above-deck structures
• Overhead electrical transmission tower leg members and bracing tubulars
• Workshop jigs, fixture frames, and custom fabrication support structures
• Cold-storage and refrigerated warehouse structural frames and column supports