The surface quenching and tempering heat treatment of seamless steel pipes is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. Vickers hardness tester can be used for hardness testing, Rockwell hardness tester or surface Rockwell hardness tester can also be used. The selection of…
Read MoreThe reasons for the deformation of carbon seamless steel pipes are often complicated, but as long as we master the laws of deformation, analyze the causes, and use different methods to prevent the deformation of the mold, it can be reduced and controlled. In general, the heat treatment deformation of seamless steel pipes can be prevented by the following…
Read MoreSeamless steel pipe (smls pipe) is a non-combustible building material, which has the characteristics of earthquake resistance and bending resistance. In practical applications, seamless steel pipes can not only relatively increase the load capacity of buildings, but also meet the needs of architectural design aesthetic modeling, and also avoid the defects that concrete and other building materials cannot be…
Read MoreFor the defects of seamless steel pipes, magnetic flux leakage detection method, ultrasonic detection method, eddy current flaw detection method, etc. can be used. 1. Magnetic flux leakage detection method The magnetic flux leakage detection method is to use the magnetic flux leakage principle to detect the seamless steel pipe. During the inspection process, the inspected seamless steel pipe…
Read MoreAnalysis of the causes of common defects in seamless steel pipes: (1) Reasons for the irregular distribution of folding defects. Improper viscosity of mold slag, obvious abnormality of molten steel vortex or abnormal vibration frequency of mold will cause slag entrainment. Most of the mold slag exists in the subcutaneous or surface area of the continuous casting billet, so…
Read MoreCommon defects of seamless steel pipes can be divided into two categories: external surface defects and internal surface defects. 1. External surface defects (1) Folding defects are irregularly distributed. Macroscopic features: If there is mold residue left on the surface of the continuous casting billet, the outer surface of the rolled tube will have deep folds.There are stacking defects,…
Read MoreWhen the carbon seamless steel pipe is cold drawn, there are defects such as cracks in the hot rolled tube blank. For example, after the high-precision cold-drawn tube is made into an oil cylinder, the fracture that occurs during use has almost no plastic deformation, and is generally brittle fracture. Brittle fracture is caused by a variety of reasons….
Read MoreThe main reasons for the lack of hardness of seamless steel pipes (smls) are the following five points: 1. The heat treatment temperature is too high This is mainly caused by the poor temperature setting of the processing technology or the error of the temperature control system. The temperature of the processing technology should be adjusted, and the temperature…
Read MoreXINYUE STEEL GROUP set up several production bases in Tianjin & Hebei Province, manufacturing ERW Steel Pipe, SSAW Steel Pipe, LSAW Steel Pipe, Seamless Steel Pipe, Scaffolding system and couplers, RHS, SHS, etc.
