Thick steel plate for pressure vessel, method for manufacturing the same, use of the same

Abstract

The invention provides a thick steel plate for a pressure vessel, a method for manufacturing the same and use of the same. The thick steel plate comprises the following chemical components: 0.08 to 0. 20 weight percent of C, 0.10 to 0.40 weight percent of Si, 1.0 to 1.6 weight percent of Mn, less than or equal to 0.01 weight percent of S, less than or equal to 0.012 weight percent of P, 0.015 to 0.05 weight percent of Al, 0.40 to 0.60 weight percent of Mo, less than or equal to 0.10 weight percent of Cu, 0. 40 to 0.80 weight percent of Ni, less than or equal to 0.05 weight percent of V, less than or equal to 0.008 weight percent of N, and the balance of Fe and inevitable impurities. Alloying and heat treatment ensure the high strength, excellent toughness and other characteristics of the thick steel plate. The product of the method can replace pressure vessel made of a forged piece, and is particularly suitable for manufacturing cylinders, sealing plug and the like for nuclear reactor pressure vessels, evaporators and stabilizers.

Description

technical field [0001] The invention relates to the field of iron and steel materials. Specifically, the invention relates to low-carbon low-alloy steel. More specifically, the invention relates to a high-strength quenched and tempered thick steel plate for pressure vessels and its application in the nuclear power industry. Background technique [0002] The basic requirements of steel for pressure vessels are high strength, good plasticity, toughness, manufacturing performance and compatibility with media. In terms of mechanical properties: First of all, the material used to manufacture pressure vessels should have appropriate strength (mainly referring to yield strength and tensile strength) to prevent plastic deformation or even fracture when subjected to pressure. Secondly, the material used to make the pressure vessel must have good plasticity to prevent the pressure vessel from being damaged due to accidental overloading during use. Third, the material used to manufact...

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Problems solved by technology

[0014] The steel disclosed in JP63053243A can be used for nuclear reactor pressure vessels. It is alloyed with Ni and Mo on the basis of the composition of low-carbon manganese steel. The content of C and Ni is relatively high, and it needs to be produced by forging with steel ingots. It belongs to forging products and cannot fully meet actual needs.

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