Preheat Deformation of LSAW Pipe

First, a reasonable selection. Fine precision messy mold should choose a good quality of micro-deformation of mold steel, carbide segregation serious mold steel should be reasonable casting and heat treatment for tempering, the larger and can not mold steel can be solid-solution double-thin heat treatment. Reasonable choice of heating temperature, control the heating rate, on the precision messy mold can be slow heating, preheating and other balanced heating method to reduce the mold heat treatment deformation.

Second, the correct heat treatment process operation and reasonable tempering heat treatment process is also a useful method to reduce the precision messy mold deformation. Precision messy mold deformation causes are often messy, but we only need to grasp the rules of its deformation, analysis of the causes of the attack, the use of unusual methods to avoid the deformation of the mold can be reduced, but also can be controlled.

Third, precision messy mold to be pre-heat treatment, eliminating the residual stress during the machining process. On the messy mold precision, where conditions allow, try to use vacuum heating quenching and quenching after cryogenic treatment. Under the premise of ensuring the mold hardness, try to use pre-cooling, graded cooling quenching or warm quenching process.

Fourth, describe the mold planning should be reasonable, not too disproportionate thickness, the shape should be symmetrical, on the deformation of a larger mold to grasp the rules of deformation, allowance for processing allowances, on the large, sophisticated messy mold can be used combination of planning. For some precision messy mold can choose pre-heat treatment, aging heat treatment, tempering nitriding heat treatment to control the accuracy of the mold. In the repair of mold trachoma, porosity, wear and other defects, the choice of cold welding and other thermal effects of small repair equipment to avoid the process of repairing the deformation of the attack.

In addition, the correct heat treatment process operations (such as plugging, tied hole, mechanical fixation, suitable heating method, the correct choice of the mold cooling direction and the direction of movement in the cooling medium, etc.) and reasonable tempering heat treatment process is also to reduce the complexity Mold deformation effective measures.

A worker from a steel pipe company, which is located in China.