Difference of steel pipe: the difference between precision steel pipe and seamless steel pipe

Precision seamless steel pipe is a kind of high-precision steel pipe after cold drawing or hot rolling. Because the precision seamless steel pipe inner and outer wall without oxide layer precision seamless steel pipe, withstand high pressure and no leakage, high precision, high finish, cold bending deformation, flaring, flattening and no cracks, it is mainly used to produce pneumatic or hydraulic components Products such as cylinders or cylinders are made of seamless tubes. The chemical composition of precision seamless steel tubes is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.
The difference between precision steel pipe and seamless steel pipe 1. The main feature of seamless steel pipe is that it has no welding seam and can withstand greater pressure. The product can be very rough cast or cold dial.
2. Precise steel pipe is a product that has emerged in recent years. It mainly has strict tolerances and roughness on the inner hole and outer wall dimensions.
Characteristics of cold drawn precision steel pipe 1. Smaller outside diameter.
2. High precision can be done in small batch production.
3. High-precision cold drawn products, good surface quality.
4. The transverse area of the steel tube is more complicated.
5. The steel pipe has better performance and the metal is denser.
Executive standard GB/T3639
GB/T8713
DIN2391-2
HK15-2000
Uses Used for manufacturing mechanical structures, hydraulic equipment, automotive parts Delivery status Delivery status Code Description Cold processing / Hard BK No heat treatment after the last cold working so that the tube can be deformed with only a small amount of cold Work / soft BKW after the final heat treatment Small deformation The amount of cold work permits limited cold deformation of the end of the steel pipe (for example: bending, flaring)
Annealing after cold working Annealing BKS is finally annealed below Ac 1 to eliminate cold working stress Annealing After GBK finish cold working, the steel tube is fully annealed in the protective atmosphere. After normal cold NBK is finally cold-worked, the steel tube is subjected to a protective atmosphere. fire