Cold-drawn or cold-rolled precision seamless steel pipes are cold-drawn or cold-rolled precision seamless steel pipes used for mechanical structures and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, increase material utilization, and at the same time help improve product quality. 15. The structural stainless steel seamless steel pipe (GB/T14975-1994) is a hot-rolled stainless steel ( Extruded, expanded) and cold drawn (rolled) seamless steel tubes. 16. Stainless steel seamless steel tubes for fluid transportation (GB/T14976-1994) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel tubes made of stainless steel for fluid transportation. 17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes. According to the different shape and size of the steel pipe section, it can be divided into equal wall thickness special-shaped seamless steel pipe (code D), unequal wall thickness special-shaped seamless steel pipe (code BD), variable diameter special-shaped seamless steel pipe (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel. 18.GB18248-2000 (Seamless steel tubes for gas cylinders). Mainly used to make various gas and hydraulic cylinders.
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