The production process for thick-walled seamless steel pipes can be divided into cold drawing.、Cold Rolled、Hot rolledFour basic methods of hot expansion, steel pipes with materials of 10#, 20#, 35#, 45# are referred to as ordinary steel pipes, classified by application.Structural Seamless Steel PipeSeamless steel tubes for conveying purposesBoiler Seamless Steel Pipe；Boiler high-pressure seamless steel pipes; Equipment high-pressure seamless steel pipes; Geotechnical drilling seamless steel pipes; Oil drilling seamless steel pipes; Oil cracking seamless steel pipes; Ship seamless steel pipes; Cold drawn and cold rolled precision seamless steel pipes; Various alloy pipes. Seamless steel pipes are denoted by outer diameter and wall thickness. Thick-walled seamless steel pipes are mainly used in mechanical processing, coal mining, hydraulic steel, and various other applications.
Hot-rolled thick-walled seamless steel tubes, cold-rolled thick-walled seamless steel tubes, cold-drawn thick-walled seamless steel tubes, extruded thick-walled seamless steel tubes, and stainless steel seamless steel tubes for pipe jacking structures (GB/T14975-2002) are used for general and mechanical structural seamless steel tubes. They are widely employed in corrosion-resistant pipelines and structural parts/pieces made of stainless steel for industries such as chemicals, petrochemicals, light industry, food, and machinery. Hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel tubes.
Stainless steel seamless steel tubes for fluid conveyance (GB/T14976-2002) are general-purpose seamless steel tubes used for transporting fluids such as water, oil, and gas. They are typically made of stainless steel through hot rolling (extrusion, expansion) and cold drawing (rolling) processes.
Alloy seamless steel pipes refer to seamless steel pipes with cross-sectional shapes other than circular ones. They can be further divided into equal wall thickness alloy seamless steel pipes (code D), unequal wall thickness alloy seamless steel pipes (code BD), and variable diameter alloy seamless steel pipes (code BJ) based on different cross-sectional shape and size dimensions. These pipes are widely used in various structural components, tools, and mechanical parts. Compared to round pipes, the non-standard pipes generally have larger moment of inertia and section modulus, offering greater bending and torsional resistance, which can significantly reduce structural weight and save on steel.
