Method for heat treatment of straight seam steel pipe

First of all, the layout design of the technical mold should be reasonable, the thickness should not be too wide, the shape should be symmetrical, the deformation rules should be grasped for the larger deformed mold, and the processing allowance should be reserved. For the large, fine and messy mold, a combined layout can be selected. For some fine and messy molds, pre-heat treatment, aging heat treatment, and tempering nitriding heat treatment can be used to control the accuracy of the mold. When repairing mold blisters, pores, wear and other shortcomings, use cold welders and other repair equipment with low thermal impact to avoid deformation during the repair process.

Fine and messy molds should be pre-heated to eliminate the residual stress that occurs during machining. For fine and messy molds, if the conditions permit, try to use vacuum heating quenching and cryogenic treatment after quenching. On the premise of ensuring the hardness of the mold, try to use pre-cooling, hierarchical cooling quenching or warm quenching processes.

Choose materials reasonably. For fine and messy molds, micro-deformed mold steels with good raw materials should be selected. For mold steels with severe carbide segregation, reasonable casting and quenching and tempering heat treatment should be carried out. For larger and uncastable mold steels, solid solution double refinement heat treatment can be carried out. Reasonably select the heating temperature and control the heating speed. For fine and messy molds, slow heating, preheating and other balanced heating methods can be adopted to reduce the heat treatment deformation of the mold.

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