Thermal Deformation Method of LSAW Steel Pipe

　　First, reasonable selection. Precision messy mold material should choose a good micro-deformation of steel on steel carbide segregation serious mold should be a reasonable casting and heat treatment quenching and tempering, solution heat treatment on a large double refining and casting mold steel can not be carried out. Reasonable choice of heating temperature control heating rate, on messy precision molds can be heated slowly, preheating and other methods to reduce the mold uniform heating heat deformation

　　Second, the correct operation of the heat treatment process and reasonable heat treatment process is also a useful way to reduce messy precision mold deformation. Deformation reason messy precision molds are often messy, but we only need to master the rules of the deformation, to analyze the attack reason, the choice of methods to avoid abnormal deformation of the mold can be reduced, and also can be controlled.

　　Third, precision molds to be messy pre-heat treatment, machining process to eliminate the remaining episodes of stress. Precision messy mold, when conditions allow, try to use cryogenic vacuum heating process and hardening after quenching. Mold hardness in ensuring the premise, try to use pre-cooling, grading cooling or quenching temperature quenching process.

　　Fourth, mold planning is depicted to be reasonable, not too poor thickness, shape to be symmetrical with respect to large deformation mold deformation to master the rules, set aside allowance, on large, sophisticated planning messy mold can be used in combination. For some messy precision molds can be used pre-heat treatment, aging heat treatment, quenching and nitriding to control the accuracy of the mold. When mold repair blisters, porosity, wear and other defects, selection of cold welding and other small heat-affected patch repair equipment, to prevent deformation during the attack.