SCC-corrosion-resistant pipe steel and manufacturing technology thereof

A manufacturing process and technology of pipeline steel, applied in the field of SCC corrosion-resistant pipeline steel and its preparation, can solve problems such as high content of precious metals, cold cracks in welding areas, and reduced ductility, etc., and achieve low content of precious metals and high tensile strength. and yield strength, the effect of ensuring hardenability

Active Publication Date: 2014-07-30
RIZHAO STEEL HLDG GROUP
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Problems solved by technology

However, the content of precious metals such as Ni and Mo in the pipeline steel is high, and the manufacturing cost is very high.
Although the Cr in it can resist HIC, too high Cr will reduce the ductility, promote the growth of grains and affect the toughness, resulting in the generation of cold cracks in the welding area

Method used

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  • SCC-corrosion-resistant pipe steel and manufacturing technology thereof

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Embodiment Construction

[0014] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0015] The pipeline steel described in this embodiment does not add precious 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 are used 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, not only the weather resistance and corrosion resistance of the steel are guaranteed, but also excellent resistance to SCC corrosion and HIC corrosion performance. 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 the steel ...

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Abstract

SCC-corrosion-resistant pipe steel comprises, in percent by mass, Si: 0.15-0.25%, Mn: 1.6-2.0%, Ni: 0.05-0.15%, Cr: 0.65-0.80%, Cu: 0.05-0.12%, Mg: 0.02-0.05%, Ti: 0.015-0.025%, Ca: 0.001-0.003%, W: 0.002-0.005%, Al: 0.025-0.055%, P<=0.012%, S<=0.01%, the balance Fe and unavoidable impurities, wherein 0.05<=C+Ni/5+Cr/10-Mg-10W<=0.09. The manufacturing technology of the pipe steel comprises pre-desulphurization of molten iron, converter smelting, LF refining, RH processing, slab continuous casting, slab reheating, rolling and cooling bed cooling. By adding a proper amount of Mg, Ca and W into the pipe steel, reduction of pH value of corrosion front end is inhibited, generation and expansion of corrosion-cracked cracks are effectively inhibited, the content of C, Ni and Cr are controlled at proper scopes, and the pipe steel is guaranteed to have excellent SCC (Stress Corrosion Cracking) corrosion resistance and HIC (Hydrogen Induced Cracking) corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of high-strength alloy steel manufacturing, and more specifically, the invention relates to a SCC corrosion-resistant pipeline steel that can be used in engineering projects such as natural gas pipelines and a preparation process thereof. Background technique [0002] In the past 10 years, the proportion of natural gas 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, which can bring considerable benefits to large-scale natural gas pipeline projects, and will put forward higher requirements for pipeline design and pipeline steel manufacturing. High-pressure gas t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58
Inventor 杨建亚严进宝张云田李建科李明贤潘永岗李玉春
Owner RIZHAO STEEL HLDG GROUP
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