With the gradual development of the policy side, the follow-up steel demand is improving; from the perspective of supply, the relevant departments reiterated the policy tone of crude steel production reduction, and the steel industry will develop in the direction of refinement and high quality in the future.
We should know that the carburizing of special-shaped steel pipes can improve the HRC hardness of steel pipes. Spiral steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, which is often warmly extruded and welded by automatic double-wire double-sided submerged arc welding process. Using the advanced double-sided submerged arc welding process, the welding can be realized in the best position, and it is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality. Carburizing is a method of surface treatment of special-shaped steel pipes. The method used in most carburizing low carbon steel or low alloy steel is to place the workpiece in an active carburizing medium, heat it to a single-phase austenite region of 900≤950℃, and heat it for a long enough time, carburizing The activated carbon atoms decomposed in the medium penetrate into the surface layer of the steel part. So the surface layer is high carbon, while the original composition remains in the core.
The softening of the surface of the carburized layer after grinding is called tempering caused by grinding. Precision steel pipe is a high-precision steel pipe material processed by cold drawing or hot rolling. Due to the advantages of no oxide layer on the inner and outer walls of the precision steel tube, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components, such as cylinders or The oil cylinder can be a seamless pipe or a welded pipe.