SCC corrosion-resistant pipeline steel and its manufacturing process
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A manufacturing process and pipeline steel technology, applied in the field of SCC corrosion-resistant pipeline steel and its preparation, can solve the problems of high precious metal content, cold cracks in the welding area, and reduce ductility, etc., to achieve low precious metal content and high tensile strength and yield strength, the effect of ensuring hardenability
Active Publication Date: 2016-10-05
RIZHAO STEEL HLDG GROUP
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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
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[0014] The technical solution 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 within an economically appropriate range. The design concept of low carbon and high manganese is adopted, supplemented by copper, Titanium and other elements produce high-strength steel with excellent comprehensive properties; and by adding appropriate amounts of Mg, W and controlling the content of Ni and Cr, it not only ensures the weathering and corrosion resistance of the steel, but also has excellent resistance to SCC corrosion and HIC Corrosion performance. The pipeline steel described in this embodiment adopts Ti and Al microalloying technology to control the final cooling temperature at 480-550°C, which helps to ensure that the steel has fine grains and uniform structur...
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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. More specifically, the invention relates to a SCC corrosion-resistant pipeline steel that can be used in natural gas pipelines and other engineering projects and its preparation process. Background technique [0002] In the past 10 years, the proportion of natural gas in the world's energy structure has risen sharply, leading to 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 trunk pipeline length. The high-pressure transmission and high-density gas transmission technology is the development trend of today's 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 transmission requires pipeline...
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