Steel having excellent irradiation resistance and used for steel lining of nuclear power plant, and manufacturing method thereof

Abstract

The invention relates to steel having excellent irradiation resistance and used for a steel lining of a nuclear power plant. The steel comprises the following components by weight: 0.10 to 0.20% of C,0.20 to 0.45% of Si, 0. 80 to 1.50% of Mn, no more than 0.01% of P, no more than 0.008% of S, 0.02 to 0.05% of Alt, 0.01 to 0.03% of V, no more than 0.006% of N, no less than 2 of Alt / N, no more than1.5 ppm of [H], no more 30 ppm of [O], no more than 0.005% of Cu, no more than 0.005% of As, no more than 0.001% of B, no more than 0.002% of Sb and no more than 0.002% of Sn. A steel plate manufactured by using a method provided by the invention has the advantages of low cost, excellent irradiation resistance, uniform structure, fine crystal grains, few and small inclusions, stable mechanical properties, excellent process performances, and performances meeting the technical requirements of the steel used for the steel lining of the nuclear power plant; and no precious elements like Ni, Cr, Mo, Nb and Ti are added, so production cost is reduced, and excellent resistance to irradiation embrittlement of the steel plate is guaranteed.

Description

technical field [0001] The invention relates to ferrous metal materials, in particular to a steel for nuclear power plant steel lining with excellent radiation resistance and a manufacturing method thereof. Background technique [0002] CPR1000 is China's improved million-kilowatt (1000MW) pressurized water reactor nuclear power technology program launched by China Guangdong Nuclear Power Group Co., Ltd. It is based on the introduction, digestion and absorption of foreign advanced technology, combined with more than 20 years of gradual improvement and independent innovation to form the "second generation plus" million-kilowatt-level pressurized water reactor nuclear power technology. With advanced design concepts and excellent safety performance, this technology is widely used in new nuclear power units in my country. [0003] The nuclear island in this type of nuclear power plant is protected by three barriers, including nuclear fuel element cladding, reactor primary loop ...

AI Technical Summary

Problems solved by technology

In this patent, the steel plate is produced by controlled rolling and controlled cooling + coiling. The steel has low purity, high alloy content, and poor low temperature toughness.

The alloying elements Cr (0.15-0.6%), Nb (0.01-0.04%) and Ti (0.008-0.03%) are added to its composition, which is not only detrimental to the radiation resistance of the steel, but also increases the production cost

[0006] Patent CN 103911559 B "a steel plate for nuclear power plant pressure vessel and its manufacturing method" application number: 201410098857.1, the invention relates to a steel plate with a thickness ranging from 6 to 100mm, and steel plates with a thickness of ≤40mm are produced by controlled rolling. This patent is only for control There are requirements for the mechanical properties of the steel plate in the rolling state, but there is no requirement for the simulated post-weld heat treatment required for nuclear power equipment. At the same time, the tensile properties of the steel plate in the controlled rolling state cannot meet this requirement.

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