The manufacturing of thick-walled seamless steel pipes is a complex and delicate process, which mainly includes raw material preparation, perforation, rolling, heat treatment, finishing and inspection. The raw materials are mostly high-quality carbon steel, alloy steel or stainless steel, and can enter the production process only after strict chemical composition analysis and mechanical property testing.

The perforation process is the first and most critical step in the manufacture of thick-walled seamless steel pipes. Through hot perforation or cold perforation, the solid round steel billet is perforated into a hollow rough tube. Hot perforation uses high temperature to soften the metal and reduce deformation resistance, while cold perforation relies on strong pressure to perforate the billet directly at room temperature. Both have their advantages and disadvantages, and they are selected according to product requirements and material characteristics.

The rolling process is a key link in improving the uniformity of steel pipe wall thickness and dimensional accuracy. Through multiple rolling passes, the inner and outer diameters and wall thickness of the steel pipe are continuously adjusted until the design requirements are met. In this process, temperature control, roll design and precise adjustment of rolling process parameters are crucial.

Heat treatment is to eliminate the internal stress generated during the processing of the steel pipe and improve its structure and performance. Common heat treatment methods include annealing, normalizing, quenching and tempering, etc. The specific selection depends on the material and final use of the steel pipe.

Finally, after finishing and strict quality inspection, including appearance inspection, dimensional measurement, non-destructive testing, etc., to ensure that each thick-walled seamless steel pipe meets national and industry standards before it can be shipped.
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