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Deformation quenching and tempering process for seamless acid wiring tube

A seamless acid and line pipe technology, applied in the field of casting, can solve the problems of difficulty in guaranteeing strength, difficulty in quenching and tempering, and difficulty in control, etc., and achieve the effect of good toughness and high strength

Inactive Publication Date: 2015-04-29
青岛齐力铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

If seamless steel pipes are used to produce high-grade X70 acid line pipes, due to the integrity of the pipe body, it is obviously safer to use than welded pipes, but the production process of seamless steel pipes is more complicated and difficult to control, and it cannot be maturely applied online at present. Controlled rolling and controlled cooling technology usually adopts quenching and tempering treatment to produce high-grade steel line pipe products. Not only the production cost remains high, but also the quenching and tempering is difficult, and the strength is difficult to guarantee, losing the competitive advantage with welded pipes

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0019] The deformation quenching and tempering process of the X70 seamless acid line pipe in this embodiment includes the following steps:

[0020] (1) The material is a continuous casting slab of a company's self-produced brand HS485S. The slab diameter is 400mm. 0.01Ni, 0.2Cr, 0.01Mo, appropriate amount of V, Nb, Ti;

[0021] (2) Heat the billet to 1200°C in a ring furnace, drop it to 1100°C for piercing, then roll it back at 1000°C, saw at 500°C, and heat it to 980°C in two steps for austenitization;

[0022] (3) Carry out the sizing and deformation process of the line pipe at 920°C after being released from the furnace;

[0023] (4) Water quenching at 860°C (water quenching time 80s), tempering at 600°C for 80min.

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Abstract

The invention discloses a deformation quenching and tempering process for a seamless acid wiring tube. Contrastive analysis between the deformation quenching and tempering process and a common quenching and tempering process which are carried out on an X70 large-aperture thick-wall seamless acid wiring tube shows that the deformation quenching and tempering process has the advantages that strength is obviously improved, good toughness is obtained, performances of a product can completely meet requirements and production cost is also reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a deformation quenching and tempering process of a seamless acid line pipe. [0003] Background technique [0004] X70 acid line pipe has high strength and good resistance to H 2 S corrosion performance, is containing H 2 S is an important pipeline product for long-distance transportation of corrosive gas, oil and gas. The acid line pipe used in the harsh environment has strict restrictions on the carbon equivalent and alloying elements of the steel pipe. Usually, low carbon and low alloy steel are used to ensure the welding performance and reduce the crack sensitivity coefficient, which makes the hardenability of the material poor , Quenching and tempering treatment is difficult, especially for X70 high steel grade acid line pipe products with large specifications. Therefore, large-diameter X70 acid line pipes are mostly produced by welded pipes. Due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/10C21D1/18C21D6/00
Inventor 刘占向
Owner 青岛齐力铸钢有限公司
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