Hot rolling method of metallurgical bonding wear-resistant composite tube

Abstract

The invention discloses a hot rolling method of a metallurgical bonding wear-resistant composite tube, belonging to the field of tube rolling methods. The hot rolling method comprises the following steps of: producing a centrifugal blank of bearing steel with external low-carbon steel and internal high-carbon chromium by a centrifugal pouring technology; performing a perforation deformation operation or piercing constant-deformation operation, wherein a small elongation coefficient is adopted in the operation; and finally, performing a roll-piercing constant-deformation operation again to obtain a target composite tube, wherein a large elongation coefficient is adopted in the operation. The method disclosed by the invention adopts two deformation processes; the first perforation deformation operation or piercing constant-deformation operation improves the as-cast structure of the centrifugal blank, refines the crystal grains and improves the plasticity of the centrifugal blank; and the second piercing constant-deformation operation is used for producing a finished product of composite tube with the required specification. The method disclosed by the invention effectively avoids the defects of rolling crease, internal warp and the like on the inner wall in the production of a metallurgical bonding wear-resistant composite tube of bearing steel with external low-carbon steel and internal high-carbon chromium, and greatly improves the yield and economic benefits, wherein the yield reaches 90%.

Description

technical field [0001] The invention relates to the field of pipe rolling methods. Background technique [0002] The outer material of the metallurgical combination wear-resistant composite pipe is low-carbon steel, and the inner material is high-carbon chromium bearing steel; the advantages of the metallurgical combination wear-resistant composite pipe are: the inner wall has high hardness and wear resistance, while the outer The layer wall has certain toughness and strength. The outer wall has a good wrapping and protective effect on the inner wall, which reduces the brittleness of the pipe, improves the service life and safety, and is an ideal pipe for conveying cement mortar. [0003] The manufacturing process of the metallurgical bonded wear-resistant composite pipe is: (1) Using the centrifugal casting process, the outer layer alloy is poured first, and then the inner layer alloy is poured into the pipe mold to prepare a metallurgical bonded centrifugal billet; (2) Th...

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Problems solved by technology

[0005] In order to overcome the defects of rolling and warped skin produced by the existing hot rolling process in the production of composite pipes, the present invention provides a hot rolling method for metallurgical and wear-resistant composite pipes, which can effectively avoid rolling and warping on the inner wall of the composite pipe. Warped skin and other defects, greatly improving the yield and economic benefits of composite pipes

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