Thermal Deformation Method of LSAW Steel Pipe

First, a reasonable choice. Precision messy mold materials should be selected Good micro-deformation of the hard alloy segregation mold should be reasonable casting and heat treatment quenching and tempering, the large double-casting castings can not be heat-treated casting. A reasonable choice of heating temperature control heating rate, the messy precision molds can be slow heating, preheating and other methods to reduce the mold heated and heated uniform deformation.


Second, the correct treatment of heat treatment process and a reasonable heat treatment process, but also to reduce the precision mold deformation an effective way. Distortion reasons messy precision molds are often messy, but we only need to master the deformation laws, analyze the reasons for the attack, the choice of methods to avoid abnormal deformation of the mold can also be controlled.


Third, precision molds must be first messy heat treatment, and then eliminate the residual stress during processing. Precision messy mold, when conditions permit, try to use low-temperature vacuum heating and quenching after quenching. In ensuring the premise of mold hardness, try to use pre-cooling, graded cooling or quenching temperature quenching process.


Fourth, the mold design should be reasonable, the thickness should not be too bad, the shape should be symmetrical, relative to the deformation of large deformation to grasp the law, allow margin, in the large and complex planning can be messy mold combination. For some messy precision molds, preheat treatment, aging heat treatment, quenching and nitriding can be used to control the accuracy of the mold. When the mold repair blisters, pores, wear and other defects, choose cold welding and other small thermal impact repair equipment to prevent the impact of the deformation process.