Seamless steel tubes feature hollow cross-sections and are extensively used as pipelines for conveying fluids such as oil, gas, water, and certain solid materials. Compared to solid steel materials 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 manufacturing of structural components and mechanical parts, such as oil drilling pipes, automotive drive shafts, bicycle frames, and steel scaffolding for construction work. Manufacturing circular components from steel tubes enhances material utilization, simplifies production processes, and saves materials and labor time, making them a widely used choice.

Production Process

① Hot-rolled Seamless Steel Pipe Main Production Processes (△Main Inspection Processes): Billet preparation and inspection △→Billet heating→Piercing→Pipe rolling→Pipe reheating→Fixed (Reduced) Diameter→Heat treatment △→Finished pipe straightening→Finishing→Inspection △(Non-destructive, Physical and Chemical, Table Inspection) →Storage

② Main production processes of cold rolling (drawing) seamless steel tubes: billet preparation → acid pickling & 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钢管Inspection, Packaging, Marking, and Quality Certificate

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

③ Seamless steel tubes for high-pressure boilers, GB 5310-2008.

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

⑤ Seamless Steel Pipe for High-Pressure Equipment, GB 6479-2013