Large-caliber thick-walled seamless steel pipe production process

The manufacturing process of large-caliber thick-walled seamless steel pipe belongs to the production method of large-caliber thick-walled seamless steel tubes. The production method is that the steel refined by the electric furnace is refined by the ladle and bessed under the protection of the argon gas. The steel ingot after the bet is annealed and razored at the bottom of the riser. After heating, the vertical hydraulic press is used to punch the hole, and then the horizontal hydraulic press is used to pull the steel ingot. After stretching, reheating, stretching, heating to about 900°C, spraying water mist, quenching and tempering, machining by internal and external crucible grinding, internal and external circular grinding processes, non-destructive, shape detection products. With the method of the present invention, a large-caliber thick-walled seamless steel pipe having an outer diameter of 325-1066.8mm, a wall thickness of 25-162mm, and a length of ≤8500mm can be produced. The seamless steel pipe meets national standards and can be used as a power station and high pressure boiler. Thick-walled seamless steel tubes, pressure vessels, cylinders, chemical industry steel tubes, centrifugal casting tube molds, etc.