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A pipeline steel for transporting natural gas resistant to stress corrosion cracking and its manufacturing process

A technology of stress corrosion resistance and natural gas, applied in the field of steel pipe manufacturing, can solve the problems of reducing ductility, cold cracks in welding areas, etc., and achieve the effect of ensuring hardenability, high tensile strength and yield strength, and less precious metal content

Inactive Publication Date: 2016-02-17
珠海市双保管道设备安装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the Cr in it can resist HIC, too high Cr will reduce the ductility and cause cold cracks in the welding area

Method used

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  • A pipeline steel for transporting natural gas resistant to stress corrosion cracking and its manufacturing process

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Embodiment Construction

[0015] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0016] The pipeline steel described in this example adds trace amounts of noble metal elements such as Mo and V, and the amount of Ni and Cr is relatively low, which is controlled in an economical and appropriate range. The design idea of ​​low carbon and high manganese is adopted, supplemented by copper , titanium and other elements to prepare high-strength steel with excellent comprehensive properties; and by adding an appropriate amount of Mg, W and controlling the content of Ni and Cr, the weather resistance and corrosion resistance of the steel are guaranteed, and it also has excellent stress resistance Corrosion cracking and HIC corrosion performance.

[0017] The pipeline steel described in this example adopts Ti and Al microalloying technology, and the final cooling temperature is controlled at 480-550°C, which is beneficial to ensure that...

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Abstract

The invention relates to a stress-corrosion-cracking-resistant pipeline steel for delivering natural gas, which comprises the following components in percentage by mass: 0.04-0.06% of C, 0.16-0.25% of Si, 1.7-2.0% of Mn, 0.06-0.15% of Ni, 0.68-0.80% of Cr, 0.08-0.12% of Cu, 0.03-0.05% of Mg, 0.018-0.025% of Ti, 0.001-0.003% of Ca, 0.003-0.005% of W, 0.01-0.3% of V, 0.4-3.8% of Mo, 0.03-0.055% of Al, at most 0.01% of O, at most 0.01% of P, at most 0.01% of S, and the balance of Fe and inevitable impurities, wherein 0.06<=C+Ni / 5+Cr / 10-Mg-10W<=0.08. The steel plate has the advantages of higher tensile strength, higher yield strength, excellent weldability and favorable comprehensive properties.

Description

technical field [0001] The invention belongs to the technical field of steel pipe manufacturing. More specifically, the invention relates to a stress corrosion cracking (SCC) resistant natural gas pipeline steel and its manufacturing process that can be used in long-distance natural gas pipelines. Background technique [0002] In recent years, oil resources have been almost exhausted, and the proportion of natural gas applications in the world's energy structure has risen sharply, resulting in the rapid development of natural gas pipelines. The trunk gas pipelines of the United States and Russia account for more than 50% of the total length of the total trunk oil and gas pipelines. . High-pressure transmission and high-density gas transmission technology is the development trend of international large-flow pipeline technology. High-pressure and high-density natural gas transmission puts forward higher requirements for pipeline design and pipeline steel manufacturing. High-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58
Inventor 石倩文
Owner 珠海市双保管道设备安装有限公司
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