Production method of hot-rolled plate coil used for high-strength corrosion-resistant pipe steel
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A hot-rolled coil, corrosion-resistant technology, used in the field of iron and steel materials
Active Publication Date: 2021-10-19
XINJIANG BAYI IRON & STEEL
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[0013] This invention is a kind of steel for oil and gas casing and geothermal water pipe developed for various problems existing in the high-strength oil casing steel currently used in the market. The steel is required to have H 2 S, CO 2、 , Cl - While waiting for corrosion, water corrosion resistance is also required, and a method for preparing hot-rolled coils for high-strength corrosion-resistant pipe steel is proposed
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[0025] A preparation method of hot-rolled coils for high-strength corrosion-resistant pipe steel. In terms of composition design, the use of elements such as copper and nickel is meaningful for atmospheric corrosion resistance, but for casings serving underground, it is mainly resistant to H 2 S, CO 2、 , Cl - Etc. corrosion. Therefore, in terms of composition design, while satisfying various properties, it is necessary to consider the threading and tapping of the end connection of the steel pipe, and to ensure the machinability of the steel by appropriately increasing the carbon content. Therefore, the C content in the composition design is 0.185-0.205 wt%. Since the most influential factor on hydrogen sulfide corrosion is the banded structure of the steel caused by slab center segregation, the non-metallic inclusions enriched in the banded structure will become corroded The source of cracks, the main method to solve the corrosion resistance of steel is to improve the purity...
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Abstract
The invention discloses a production method of a hot-rolled plate coil used for high-strength corrosion-resistant pipe steel. The hot-rolled plate coil used for the high-strength corrosion-resistant pipe steel comprises the following components: 0.18 to 0.21 wt% of C, 0.10 to 0.20 wt% of Si, 1.15 to 1.25 wt% of Mn, less than or equal to 0.015 wt% of P, less than or equal to 0.0025 wt% of S, 0.015 to 0.20 wt% of Nb, 0.015 to 0.25 wt% of Ti, 0.015 to 0.035 wt% of Al, less than or equal to 0.0045 wt% of N and the balance impurities. The material production technology comprises the steps of molten iron desulphurization pretreatment, top-bottom combined blowing converter blowing, LF refining, RH vacuum treatment, slab continuous casting, slab cleaning, slab entering a furnace and reheating, controlled rolling and cooling, coiling, steel coil finished product inspection and performance detection. The method is developed aiming at various problems of high-strength steel used for petroleum casing pipes in the current market, the high-strength corrosion-resistant pipe steel is steel used for oil casing pipes, gas casing pipes and geothermal water pipes, and the steel is resistant to corrosion of H2S, CO2, Cl<-> and the like, resistant to water corrosion and good in comprehensive performance.
Description
technical field [0001] The invention provides a method for producing steel for steel pipes, belongs to the field of iron and steel materials, and relates to a method for preparing hot-rolled coils for high-strength corrosion-resistant pipe steel. Background technique [0002] The casing used for oil, natural gas and geothermal acquisition is a steel pipe used to support the walls of oil, gas and water wells to ensure the smooth progress of the drilling process and the normal operation of the oil well after completion. Due to different geological conditions, the state of underground stress is complex, the tension caused by the self-weight of the steel pipe, the extrusion and bending of the rock wall, the torsional stress caused by the threaded connection, and the H 2 S, CO 2、 , Cl - Affected by factors such as corrosive media and other factors, the steel pipe needs to be used in harsh environments. Once the steel pipe is damaged for some reason, the entire well may be scrap...
Claims
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