The production process for thick-walled seamless steel pipes can be categorized intoCold Drawn、Cold Rolled、Hot Rolled、Hot ExpansionFour basic methods, steel pipes with materials of 10#, 20#, 35#, and 45# are referred to as ordinary steel pipes, and are classified by application.Structural Seamless Steel PipeSeamless steel tubes for conveying purposesBoiler Seamless Steel PipeBoiler-gradeHigh-pressure Seamless Steel Pipe；High-pressure seamless steel tube for equipmentGeological drillingSeamless Steel PipePetroleumSeamless steel tubes for drilling；Seamless steel tubes for oil cracking；Seamless steel tubes for shipbuildingCold drawn, cold rolledPrecision Seamless Steel PipeVarious alloy pipes. Seamless steel tubes are denoted by their outer diameter and wall thickness. Thick-walled seamless steel tubes are mainly used for mechanical processing, coal mining, hydraulic steel, and various other applications.
Hot-rolled thick-walled seamless steel tubesCold-rolled thick-walled seamless steel tubes, cold-drawn thick-walled seamless steel tubes, extruded thick-walled seamless steel tubes, and seamless steel tubes for pipe jacking structures (GB/T14975-2002) are used for general and mechanical structures, widely applied in...Chemical IndustryStainless steel hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes for corrosion-resistant applications in industries such as oil, light industry, textiles, medical, food, and machinery.
Fluid Transfer for Industrial UseStainless Steel Seamless Pipe(GB/T14976-2002) is a general seamless steel tube used for conveying fluids such as water, oil, and gas, commonly made of stainless steel through hot rolling (extrusion, expansion) and cold drawing (rolling) processes.
Special-shaped seamless steel tubes refer to seamless steel tubes with cross-sectional shapes other than circular. They can be further divided into equal wall thickness special-shaped seamless steel tubes (code D), unequal wall thickness special-shaped seamless steel tubes (code BD), and variable diameter special-shaped seamless steel tubes (code BJ) based on the different dimensions of the tube cross-section. Special-shaped seamless steel tubes are widely used in various structural components, tools, and mechanical parts. Compared to round tubes, special-shaped tubes generally have larger moment of inertia and section modulus, offering greater bending and torsional resistance, which can significantly reduce structural weight and save steel.
