1. Rational Material Selection for Straight Seam Steel Pipes. For precision and complex molds, high-quality micro-deformation mold steel should be selected. For mold steel with severe carbide segregation, proper casting and tempering heat treatment should be performed. For larger mold steels or those that cannot be cast, solution double-refining heat treatment can be used. Rational selection of heating temperature and control of heating rate are crucial. For precision and complex molds, slow heating, preheating, and other methods of balanced heating can be used to reduce heat treatment deformation.

2. Correct Heat Treatment Process for Straight Seam Steel Pipes. Correct heat treatment process operation and reasonable tempering heat treatment process are also effective methods to reduce deformation of precision and complex molds. The causes of deformation in precision and complex molds are often complex, but by understanding their deformation rules, analyzing their causes, and using appropriate methods to prevent deformation, it can be reduced and controlled.

3. Preheating Treatment of Straight Seam Steel Pipes. Precision and complex molds should undergo preheating treatment to eliminate residual stress generated during machining. For precision and complex molds, vacuum heating quenching and deep cryogenic treatment after quenching should be used whenever possible, provided conditions permit. Pre-cooling, staged cooling quenching, or warm quenching processes should be used whenever possible, while ensuring the mold’s hardness.

4. Mold design for straight seam steel pipes. Mold design should be reasonable, with minimal thickness variations and symmetrical shapes. For molds with significant deformation, deformation patterns should be understood, and machining allowances should be reserved. For large, precision, and complex molds, a combination design can be used. For some precision and complex molds, pre-heat treatment, aging heat treatment, and tempering and nitriding heat treatment can be used to control mold precision. Repairing sand holes and air holes in the mold is crucial.

5. Wear and defects in straight seam steel pipes. When dealing with wear and other defects, equipment with minimal heat impact, such as cold welding machines, should be used to avoid deformation during the repair process.