Combining structural strength with precise pipe geometry, the AST YST 310 Heavy Duty 125 NB MS Round Pipe - (5.4 x 138.5 mm) - 6 mtr Length from AST PIPES is a Heavy Duty ERW round pipe in YST 310 structural steel conforming to IS 1239:2004 (Mild Steel Tubes, Tubulars, and Other Wrought Steel Fittings). The 138.5 mm OD × 5.4 mm wall (125 NB) profile in 6 m lengths achieves an optimal balance of thicker wall construction delivering maximum pressure rating and superior mechanical strength, smooth bore, and certified mechanical performance for high-pressure pipelines, heavy structural columns, and critical engineering installations. With minimum yield of 310 MPa and tensile of 450 MPa, this IS-marked pipe meets the demanding requirements of heavy-duty structural, high-pressure, and critical engineering applications with traceable, consistent quality.

• Certified YST 310 Heavy Duty ERW pipe meeting all requirements of IS 1239:2004
• Precise 138.5 mm OD with 5.4 mm wall: consistent roundness and flush seam throughout 6 m
• Duty class HD: engineered for engineered for high-pressure fluid service and heavy structural loading conditions
• Consistent ERW weld quality: clean, flush seam on both internal and external pipe surfaces
• Tensile strength 450 MPa for reliable performance under structural and hydraulic loads
• Standard 6 m cut lengths with square ends for accurate joint detailing and fit-up
• Suitable for water supply, gas distribution, structural columns, and general engineering use
• Weld-ready surface with minimal surface scale from prime coil inputs throughout
• Equal hoop strength in all directions: no orientation-specific design or detailing required
• Full quality documentation: heat number, grade, duty class, dimensions, and MTC available

• Heat exchanger shells, boiler feed lines, and steam distribution piping
• Hydraulic cylinder barrels, pneumatic actuator bodies, and precision bore tubes
• Sports facility structures: goal posts, floodlight poles, and grandstand frames
• Modular construction and prefabricated building structural tubular components
• Cold-storage and refrigerated warehouse structural frames and racking uprights
• Military and defence fabrication: shelters, antenna masts, and field structures
• General engineering fabrication: custom frames, supports, and structural inserts