Hot rolling method of metallurgical bonding wear-resistant composite tube

A metallurgical combination and composite pipe technology, applied in the field of pipe rolling, can solve problems such as rolling and warping, and achieve the effects of avoiding rolling, refining grains, improving yield and economic benefits

CN103286157AInactive Publication Date: 2013-09-11XINXING DUCTILE IRON PIPES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-09-11
Estimated Expiration
Not applicable · inactive patent

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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%.
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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...

Examples

Embodiment 1

[0024] The material of the composite pipe in this embodiment is: the outer layer is 20# low-carbon steel, the inner layer is GCr15 high-carbon steel, and the target product specification is φ133mm*5.5mm (outer layer 2mm+inner layer 3.5mm).

[0025] Utilize the concrete steps of the present invention to produce this product as follows:

[0026] In the first step, the centrifugal casting process is used to cast the outer layer alloy first, and then the inner layer alloy to prepare a centrifugal billet of the metallurgical bonded wear-resistant composite pipe.

[0027] The second step is to anneal the centrifugal billet obtained in the first step.

[0028] In the third step, the outer wall of the centrifuge blank obtained in the second step is processed by 4 mm on one side, and the inner wall is processed by 4 mm on one side. The purpose of the single side processing is to remove bad tissue parts on the outer wall and the inner wall.

[0029] The fourth step is to uniformly heat...

Embodiment 2

[0035] The material of the composite pipe in this embodiment is: the outer layer is 15Mn, the inner layer is GCr15SiMn, and the target product specification is φ140mm*9mm (outer layer 3.5mm+inner layer 5.5mm).

[0036] Utilize the concrete steps of this product of the present invention as follows:

[0037] In the first step, the centrifugal casting process is used to cast the outer layer alloy first, and then the inner layer alloy to prepare a centrifugal billet of the metallurgical bonded wear-resistant composite pipe.

[0038] The second step is to anneal the centrifugal billet obtained in the first step.

[0039] In the third step, the outer wall of the centrifuge blank obtained in the second step is unilaterally processed by 6 mm, and the inner wall is unilaterally processed by 5 mm. The purpose of unilateral processing is to remove bad tissue parts on the outer wall and the inner wall.

[0040] The fourth step is to uniformly heat the centrifuge blank processed in the se...

Embodiment 3

[0045] The material of the composite pipe is: the outer layer is 20Mn, the inner layer is GCr18Mo, and the target product specification is φ159mm*8.5mm (outer layer 3.5mm+inner layer 5mm).

[0046] Utilize the concrete steps of the present invention to produce this product as follows:

[0047] In the first step, the centrifugal casting process is used to cast the outer layer alloy first, and then the inner layer alloy to prepare a centrifugal billet of the metallurgical bonded wear-resistant composite pipe.

[0048] The second step is to anneal the centrifugal billet obtained in the first step.

[0049] In the third step, the outer wall of the centrifugal blank obtained in the second step is processed by 5 mm on one side, and the inner wall is processed by 7 mm on one side. The purpose of the single side processing is to remove bad tissue parts on the outer wall and the inner wall.

[0050] The fourth step is to uniformly heat the centrifuge blank processed in the third step ...