Seamless steel tubes feature a hollow cross-section and are extensively used as pipelines for conveying fluids, such as oil, gas, water, and certain solid materials. Compared to solid steel products like round bars, seamless steel tubes are lighter in weight while maintaining the same bending and torsional strength. They are an economical section steel widely employed in the manufacture of structural components and mechanical parts, including oil drilling pipes, automotive drive shafts, bicycle frames, and steel scaffolding for construction. Manufacturing circular components from steel tubes enhances material utilization, simplifies production processes, and saves on materials and labor, making them a popular choice for manufacturing.

Production Process

① Main production process of hot-rolled seamless steel tubes (△Main inspection process): Billet preparation and inspection △→Billet heating→Piercing→Rolling→Steel tube reheating→Dimensioning (reduction)→Heat treatment △→Finished tube straightening→Finishing→Inspection △(Non-destructive, physical and chemical, bench inspection)→Storage

② Main production processes of cold-rolled (drawn) seamless steel tubes: billet preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection

Current China Seamless Steel Pipe Standard:

1. Current Seamless Steel Pipe Standards: A total of 47 standards, including GB 25, HB 3, Special Purpose 19, Basic 2, and Product 45.

2. Standard Specifications:

GB/T 2102-2006 Steel Tube Acceptance, Packaging, Marking, and Quality Certificate

② Seamless Steel Pipe Dimensions, Shape, Weight, and Allowable Deviations - GB/T 17395-2008

GB 5310-2008 Seamless Steel Tubes for High-Pressure Boilers

④ Seamless steel tubes for petroleum cracking, GB 9948-2013.

GB 6479-2013 Seamless Steel for High-Pressure Equipment