Acid corrosion resistant quenching and tempering high-strength pressure vessel steel and production method

Abstract

Acid corrosion resistant quenching and tempering high-strength pressure vessel steel comprises the components of, by weight, 0.05%-0.10% of C, 0.15%-0.50% of Si, 0.50%-1.20% of Mn, 0-0.008% of P, 0-0.002% of S, 0.015%-0.045% of Als, 0.20%-0.80% of Ni, 0.010%-0.030% of Ti, 0.22%-0.50% of Cu, 0.50%-1.50 % of Cr, 0.23%-0.50% of Mo and 0.002%-0.006% of Ca. A production method comprises the steps of molten iron pretreatment and converter smelting, LF furnace external refining, RH vacuum treatment, tapping and continuous casting blank forming, segmented hot rolling, quenching and tempering. According to the acid corrosion resistant quenching and tempering high-strength pressure vessel steel, after composition design, inclusion control, rolling and heat treatment, yield strength is larger than orequal to 450 MPa, tensile strength is larger than or equal to 540 MPa, elongation is larger than or equal to 20%, -40 DEG C KV2 is larger than or equal to 60 J, no hydrogen induced cracking phenomenon is generated, and stress corrosion cracking is not lower than 0.70 sigma s.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel manufacturing, and relates to a high-strength pressure vessel steel and a production method thereof, in particular to an acid-resistant quenched and tempered high-strength pressure vessel steel and a production method thereof. Background technique [0002] In the petroleum and petrochemical industry, pressure vessel equipment is prone to embrittlement in acidic environments. Pressure vessel equipment materials have low performance in resistance to hydrogen-induced cracking (HIC) and hydrogen sulfide stress corrosion (SSC), especially after a long period of use of large fixed storage tanks, the residual sulfide in the storage medium accumulates and locally forms acid The atmosphere causes serious corrosion to the tank material, which greatly reduces the service life of the equipment. [0003] With the development of the petrochemical industry and the increasingly high requirements for ...

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Problems solved by technology

Although this document has excellent hydrogen sulfide stress corrosion resistance, due to the normalizing or normalizing + tempering heat treatment process it uses, the strength is low, and it still cannot meet the manufacturing requirements of large fixed spherical tanks.

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