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Manufacturing method of X70QS seamless line pipe for acid environment

A technology of seamless line pipe and manufacturing method, applied in manufacturing tools, heat treatment equipment, furnaces, etc., to achieve the effects of good HIC resistance, high elongation, and strict control of composition design

Inactive Publication Date: 2010-11-24
TIANJIN PIPE GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the manufacturing process of high-strength seamless pipes for acidic environments

Method used

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  • Manufacturing method of X70QS seamless line pipe for acid environment
  • Manufacturing method of X70QS seamless line pipe for acid environment
  • Manufacturing method of X70QS seamless line pipe for acid environment

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Embodiment Construction

[0023] The manufacturing method of the X70QS seamless line pipe for acidic environment of the present invention will be described in conjunction with the accompanying drawings and examples.

[0024] The technical scheme adopted by the present invention is to provide a method for manufacturing an X70QS seamless line pipe for acidic environments, the method comprising the following steps:

[0025] 1. Steelmaking

[0026] A reasonable chemical composition ratio and a suitable steelmaking process are necessary to obtain a qualified hot-rolled base metal.

[0027] High-quality scrap steel and alloys are used as raw materials, and the composition weight % of the configured steel grades is: C 0.06-0.14%, Si 0.20-0.45%, Mn 1.00-1.30%, P≤0.015%, S≤0.003%, Ni≤0.10%, Cu≤0.20%, Cr 0.05~0.30%, Mo 0.05~0.30%, Al 0.015~0.060%, N 0.003~0.010%, Nb 0.030~0.050%, V 0.05~0.09%, Ca≤0.060%, the balance is Fe and impurities. Carbon equivalent CEpcm≤0.22%, CE IIW ≤0.39%.

[0028] The specific op...

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Abstract

The invention provides a manufacturing method of an X70QS seamless line pipe for an acid environment, comprising the following steps: 1. steelmaking, i.e. electrosmelting, external refining, carrying out VD or RH vacuum treatment, carrying out silicon-calcium wire treatment, and adopting a continuous-casting short-flow process combined with a clean steel smelting technology for controlling the content of P, S and inclusions; 2. tube rolling, i.e. adopting a hot-rolling seamless pipe process at the continuous rolling temperature of more than 950 DEG C, jointly controlling the dimensional precision of the tube by a PQF three-roll mill and a tension-reducing mill or a sizing mill; and 3. heat treatment, i.e. under the quenching temperature of 910-980 DEG C and the tempering temperature of 550-730 DEG C, carrying out high-temperature sizing and straightening control at the temperature of 480-630 DEG C to guarantee performance and size of the pipe. The manufacturing method has the advantages of accurate composition design, high dimensional control accuracy, low manufacturing cost and easy production; and the pipe obtained by the method has good mechanical property and good corrosion resistance, thus being applicable to a high-pressure gas delivery pipeline under an acid condition.

Description

technical field [0001] The invention relates to the field of manufacturing corrosion-resistant materials and seamless pipes, in particular to a method for manufacturing X70QS seamless line pipes for acidic environments with high strength (≥485MPa) and corrosion resistance in acidic environments. Background technique [0002] With the increasing use of oil and natural gas in recent years, the development of transmission pipelines has been accelerated. Due to the compressibility of natural gas, the delivery pressure of the gas pipeline is higher than that of the oil pipeline. In recent years, the pressure of most foreign gas pipelines has increased from the early 4.5-6.4MPa to 8.0-12MPa, and some pipelines have reached 14-15.7MPa, so that the steel grade of the gas pipeline has also increased accordingly. The higher the strength of steel for pipelines, the wall thickness and diameter can be reduced without affecting the safety of gas transmission, which greatly saves the amou...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/26C21D9/08
Inventor 李艳许文妍李毅孙宇郑飞王庆国赵兴亮吕传涛
Owner TIANJIN PIPE GROUP CORP
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