Steel for hydrogen sulfide stress corrosion resisting pressure container and production method of steel

Abstract

The invention provides steel for a hydrogen sulfide stress corrosion resisting pressure container and a production method of the steel. The steel comprises the chemical components in percentage by weight of 0.05-0.12 percent of C, 0.15-0.35 percent of Si, 0.50-1.20 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S, 0.010-0.050 percent of Alt, 0.01-0.06 percent of V, 0.010-0.030 percent of Ti, 0.10-0.30 percent of Cu, 0.20-0.60 percent of Cr, 0.002-0.006 percent of Ca and less than or equal to 0.004 percent of N. The production method comprises the steps of: adopting molten iron desulphurization; smelting; refining; continuously casting into blanks; heating blanks; roughly rolling; precisely rolling; normalizing; tempering; and preparing for use. Low carbon and low alloy are adopted, and contents of P, S and N are strictly controlled, so that the steel has excellent hydrogen sulfide stress corrosion resisting capacity. A stable ferrite-pearlitic structure is obtained by using normalizing and tempering. The steel can be used for manufacturing pressure container devices used in various kinds of acid medium environments.

Description

technical field [0001] The invention relates to a steel for a pressure vessel and a production method thereof, in particular to a steel for a pressure vessel resistant to hydrogen sulfide stress corrosion and a production method thereof. Background technique [0002] Before the present invention was proposed, there were many products related to hydrogen sulfide corrosion resistant steel, but there were few products aimed at pressure vessel steel, especially hydrogen sulfide stress corrosion resistant pressure vessel steel. In the Chinese patent document titled "A Large Thickness New Anti-Hydrogen Sulfide Steel and Its Production Method", the patent application number is 200710193032.8, the disclosed composition and mass percentage are C: 0.17~0.20, Si: 0.30~0.40, Mn: 1.10~1.20, P≤0.008, S≤0.003, Ni: 0.020~0.030, Nb: 0.025~0.35, the rest are Fe and unavoidable impurities. Nb is added to the chemical composition of the steel, and at the same time, the C content in the steel i...

AI Technical Summary

Problems solved by technology

[0005] In the petroleum and petrochemical industry, pressure vessel equipment is prone to embrittlement in acidic environments, and the performance of resistance to hydrogen-induced cracking (HIC) and hydrogen sulfide stress corrosion (SSC) is not high, which greatly reduces the life of equipment

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