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Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube

A technology of wear-resistant steel pipe and manufacturing method, which is applied in the field of wear-resistant steel pipe, and can solve problems such as high cost, deterioration of toughness, unsatisfactory strength-toughness cooperation, etc.

Active Publication Date: 2014-01-29
攀枝花贝氏体耐磨管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But generally speaking, the toughness deteriorates with the increase of hardness, so at present, X series pipeline steel, composite wear-resistant pipe and inner wall hardening are generally used to manufacture wear-resistant steel pipes, but this method is complicated in process and high in cost , the combination of strength and toughness is not ideal

Method used

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  • Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube
  • Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube
  • Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube

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Experimental program
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Effect test

Embodiment 1

[0033] The lower bainite wear-resistant steel pipe for slurry transportation described in this embodiment mainly consists of C, Mn, Cr and Fe. In terms of mass percentage: C: 0.01wt%, Mn: 1.2wt%, Cr: 0.5wt%, and the balance is Fe. It should be noted that some impurities will inevitably be mixed in the production process. The lower bainite wear-resistant steel pipe for slurry transportation has a performance hardness of HRC22.5, and an impact toughness of V-notch greater than 100J / cm 2 , Tensile strength 850MPa, yield strength 550MPa.

Embodiment 2

[0035] The lower bainite wear-resistant steel pipe for slurry transportation described in this embodiment mainly consists of C, Mn, Cr and Fe. In terms of mass percentage: C: 0.50wt%, Mn: 5.0wt%, Cr: 1.8wt%, and the balance is Fe. It should be noted that some impurities will inevitably be mixed in the production process. The lower bainite wear-resistant steel pipe for slurry transportation has a performance hardness of HRC70 and an impact toughness of V-notch greater than 30J / cm 2 , tensile strength 2500MPa, yield strength 2000MPa.

Embodiment 3

[0037] The lower bainite wear-resistant steel pipe for slurry transportation described in this embodiment mainly consists of C, Mn, Cr and Fe. In terms of mass percentage: C: 0.05wt%, Mn: 3wt%, Cr: 1wt%, P: 0.001wt%, and the balance is Fe. It should be noted that some impurities will inevitably be mixed in the production process. The lower bainite wear-resistant steel pipe for slurry transportation has a performance hardness of HRC25 and an impact toughness of V-notch greater than 50J / cm 2, tensile strength 900MPa, yield strength 450MPa.

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Abstract

The invention discloses a lower bainite wear-resisting steel tube for slurry transport and a production method of the steel tube. The steel tube mainly comprises 0.01-0.50wt% of C, 1.2-5.0wt% of Mn, 0.2-1.8wt% of Cr and the balance Fe. The method comprises the steps of performing alloying the above main components, performing furnace revolving, refining and continuous casting to form a round blank, performing on-line or off-line rolling tabulation, performing air cooling or accelerated cooling to obtain the lower bainite which serves as main tissue, then performing low-temperature tempering and natural cooling or controlling the cooling speed and maintain the normal temperature to obtain the lower bainite wear-resisting steel tube. According to the steel alloy components and the production process, the problem of a two-layer structure of international and civil composite pipes is solved, and the problem that existing pipes in X series, which are used in slurry pipe long-distance transport are not wear-resisting, is also solved.

Description

technical field [0001] The invention relates to a slurry wear-resistant steel pipe, especially a wear-resistant steel pipe with lower bainite as the main structure. At the same time, the present invention also relates to the production and manufacturing method of the wear-resistant steel pipe. Background technique [0002] Slurry conveying is generally powered by water and air to drive material transportation. The size of the material varies, and the pipeline must be wear-resistant and pressure-resistant. In the international and domestic slurry transportation industry, composite pipes are generally used, and ordinary Q235 steel pipes are used as outer jackets, which are lined with a layer of wear-resistant materials. The outer layer of steel pipe is used to bear pressure to connect the long and short distances of the pipeline, and the inner layer is used for wear resistance. [0003] Wear-resistant steel pipes are widely used in electric power, metallurgy, mining, coal an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/38C22C38/24C22C38/34C22C38/40C22C38/46C22C38/58C21D8/10C21D1/18
Inventor 刘文利刘鑫
Owner 攀枝花贝氏体耐磨管道有限公司
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