The production of seamless steel pipes is a precise and complex process that requires multiple steps and strict control to ensure product quality. The following is the typical production process of seamless steel pipes:
Raw material preparation: The raw material for producing seamless steel pipes is usually steel billets, which are selected and prepared according to the required specifications and quality grades. The chemical composition, mechanical properties and surface quality of the steel billet have a significant impact on the quality of the final product.
Heating and piercing: After preheating, the steel billet is fed into the piercing machine for heating treatment. The piercing machine uses tools such as drills or rollers to pierce the center of the billet to form a tube core.
Rolling and rolling diameter expansion: The pierced steel billet passes through a continuous rolling machine or rolling unit and undergoes multiple passes of rolling and rolling diameter expansion, so that the thickness of the pipe wall gradually becomes thinner and the diameter gradually increases, forming a preliminary of seamless steel pipes.
Drawing: After preliminary rolling, the seamless steel pipe is further processed through a drawing machine. Drawing is to change the shape and size of the tube blank by stretching it, while improving the smoothness and precision of its internal and external surfaces.
Pickling and cold drawing: The drawn seamless steel pipe needs to be pickled to remove oxides and impurities on the surface and improve the surface quality. Then, it is cold drawn to make the pipe wall thickness more uniform and improve the strength and hardness of the pipe.
Heat treatment and shaping: Some seamless steel pipes require heat treatment to eliminate internal stress and improve the performance of the material. The seamless steel pipe is then passed through a shaping machine or sizing machine for final shaping and trimming to ensure it meets the specified size and quality standards.
Inspection and packaging: The completed seamless steel pipes need to undergo strict quality inspection, including chemical composition analysis, mechanical performance testing, dimensional inspection, etc. After passing the qualified inspection, the seamless steel pipes are packaged and labeled, ready to be shipped to the market or customers.
Generally speaking, the production process of seamless steel pipes involves multiple links, including raw material preparation, heating and perforation, rolling diameter expansion, drawing, pickling and cold drawing, heat treatment and shaping, testing and packaging, etc. Each link needs to be strictly controlled. and precision operations to ensure the quality and performance of the final product meet requirements.
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