Production method of hot-rolled plate coil used for high-strength corrosion-resistant pipe steel

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...

AI Technical Summary

Problems solved by technology

[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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