12Cr2Mo1R thick steel plate for equipment contacting hydrogen and method for producing the same

Abstract

The invention discloses a 12Cr2Mo1R thick steel plate used in equipment contacting hydrogen and a production method thereof which includes the following steps: a) The mass percentage of constituents is as follows: C: 0.10 to 0.15, Si: less than or equal to 0.10, Mn: 0.40 to 0.60, P: less than or equal to 0.010, S: less than or equal to 0.003, Cr: 2.0 to 2.5, Mo: 0.90 to 1.10, Cu: 0.10 to 0.20, Ni: 0.10 to 0.20, Sn is less than or equal to 0.003, Sb is less than or equal to 0.003, As is less than or equal to 0.003, Ca: 0.001 to 0.005, and Fe as the rest; b) The invention adopts converter smelting, and are casted into ingots; c) The ingots are bloomed, cogged and rolled; d) After being rolled, the ingots are normalized, and the temperature is 900 to 950 DEG C; e) Being accelerating-cooled by a pressure quenching machine based on the core part (more than or equal to 0.5 DEG C/s), bainite structures are obtained in whole thickness range; and f) Tempering treatment is carried out at 700 to 760 DEG C. The invention uses the pressure quenching machine, ensures that the microstructure of the finished product plate is tempering bainite by normalizing, accelerating cooling and tempering treatment, and obtains excellent mechanical property and weldability.

Description

technical field [0001] The invention relates to a thick steel plate and a manufacturing method thereof, in particular to a 12Cr2Mo1R thick steel plate (50-100 mm) obtained from a 2.25Cr1Mo alloy system and capable of meeting hydrogen equipment and a manufacturing method thereof. Background technique [0002] 12Cr2Mo1R (SA387Gr22Cl2) thick steel plates for oil refining pressure vessels have other requirements besides high temperature strength. Taking the heavy oil desulfurization tower as an example, the 12Cr2Mo1R (SA387Gr22Cl2) thick steel plate must have the ability to work normally under the action of high temperature, high pressure and hydrogen environment. [0003] At present, the basic requirements for 12Cr2Mo1R (SA387Gr22Cl2) thick steel plates for 2.25Cr1Mo series hydrogen equipment are: J coefficient and X coefficient satisfy: J=(Si+Mn)×(P+Sn)×10 4 ≤150, X=(10P+5Sb+4Sn+As) / 100≤15; the ductile-brittle transition condition satisfies: v Tr55+2.5Δ v Tr55≤10℃; strength...

AI Technical Summary

Problems solved by technology

However, during the production of Cr-Mo steel, due to the lack of suitable equipment and process methods, the desired microstructure cannot be obtained, and it cannot meet the requirements of the hydrogen-facing equipment.

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