Low-nickel steel plate for pressure vessel at low temperature of -120 DEG C and production method thereof

Abstract

The invention discloses a low-nickel steel plate for a pressure vessel at low temperature of -120 DEG C and a production method thereof. The steel plate comprises the components: C less than or equal to 0.04, Si less than or equal to 0.05, Mn between 0.85 and 1.50, P less than or equal to 0.005, S less than or equal to 0.003, Alt between 0.015 and 0.050, Ni between 2.00 and 3.00, Cu between 0.35 and 0.50, Cr between 0.55 and 1.00, N less than or equal to 0.004, at least one of Mo less than or equal to 0.35, Nb less than or equal to 0.05, Ti less than or equal to 0.025 and Ca less than or equal to 0.005, and Fe and inevitable impurities as the rest. According to the low-nickel steel plate, the defect of high cost of existing steel can be overcome, a feasible production process is adopted, mass production operation is facilitated, and pressure vessel steel with good low-temperature toughness, excellent impact performance and strong welding performance is obtained.

Description

technical field [0001] The invention relates to an alloy steel for containers and a production method thereof, in particular to a low-nickel steel plate which can be used for pressure vessels at a low temperature of -120°C and a production method thereof. Background technique [0002] Before the present invention was proposed, the steel types used in my country for the low temperature environment of -120°C were mainly 5Ni steel containing 5% nickel, and the Ni content was relatively high, resulting in high production costs. There is a Chinese patent "a steel for pressure vessels with high toughness at -140°C" (application number: CN201310046993.1), the composition and content of the steel used (chemical composition weight percentage, the same below) is: C≤0.05 , Si≤0.05, Mn: 0.50~1.00, P≤0.006, S≤0.003, Alt: 0.015~0.050, Ni: 4.50~5.30, Nb: 0.02~0.05, Ti: 0.008~0.025, N≤0.004, and also contains Cr≤0.50, Mo≤0.50, Cu≤0.30, Ca≤0.005, one or more steels, the service temperature ...

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Problems solved by technology

Especially for the high cost of existing steel alloys, the alloy cost of this steel is relatively low

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