First, reasonable selection. Straight pipe joints should choose a good micro deformable material straight seam steel pipe steel, for carbide segregation serious straight seam steel casting steel should be reasonable and transfer of heat treatment, larger and unable to cast a straight seam steel pipe steel may be solution bis refined heat treatment. Reasonable choice of heating temperature control heating rate, on a straight seam steel pipe can be heated slowly, preheat and other ways to reduce heating balanced straight seam steel pipe heat deformation.
Second, the correct heat treatment process operation and reasonable heat treatment process is also a useful way to reduce the distortion of straight pipe joints. Straight seam steel pipe deformation reason is often messy, but we only need to master the rules of the deformation analysis of the onset of the reason, the choice of avoiding abnormal deformation method of straight pipe joints can be reduced, and also can be controlled.
Third, straight seam steel pipe to be pre-heat treatment to eliminate the machining process of the remaining episodes of stress. For straight seam steel pipe, in the case of the conditions allow, try to use cryogenic vacuum heat treatment and quenching after quenching. In ensuring straight seam steel hardness of the premise, try to use pre-cooling, grading cooling quenching or austempering process.
Fourth, straight seam steel pipe planning portrayed to be reasonable, not too poor thickness, shape to symmetrical, straight pipe joints on large deformation deformed to master the rules, to reserve allowance, on a large, straight seam steel pipe can be used in combination plan. For some precision messy straight seam steel pipe can be used pre-heat treatment, aging heat treatment, quenching and nitriding heat treatment to control the accuracy of straight pipe joints. When the patch straight seam steel trachoma, porosity, wear and other defects, the choice of cold welding and other small heat-affected patch repair equipment, to prevent the onset of deformation process.
