Liquid lead bismuth corrosion resistant austenitic stainless steel for high-temperature fasteners and preparation method thereof

Abstract

The invention belongs to the field of austenitic stainless steel structural materials for high temperature, and particularly relates to liquid lead and bismuth corrosion resistant austenitic stainless steel for a high-temperature fastener and a preparation method of the liquid lead and bismuth corrosion resistant austenitic stainless steel. The steel comprises the following chemical components in percentage by weight: 0.06-0.12% of C; 2.0 to 3.0% of Si; 0 to 1.0 percent of Mn; 0 to 0.005 percent of S; 0 to 0.01% of P; cr: 13.0 to 17.0%; ni: 8.0 to 15.0%; 0 to 1.0 percent of Cu; 0.5 to 2.0 percent of Mo; nb: 8 * 100 C to 1.0%; 0 to 0.003 percent of O; 0 to 0.03 percent of N; and the balance of Fe. Through component design and structure regulation and control, the austenitic stainless steel for the fastener with high heat resistance, high persistent resistance, excellent lead and bismuth corrosion resistance and excellent stress relaxation resistance is obtained, and the stainless steel can be used as a novel fastener structural material facing a high-temperature lead and bismuth corrosion environment in the nuclear energy field.

Description

technical field [0001] The invention belongs to the field of austenitic stainless steel structural materials for high-temperature use, and in particular relates to a liquid lead-bismuth corrosion-resistant austenitic stainless steel for high-temperature fasteners and a preparation method thereof, which are mainly used for novel fasteners in the nuclear energy field facing high-temperature lead-bismuth corrosion environments. Firmware construction material. Background technique [0002] Lead-cooled fast reactors are fast neutron reactors cooled by liquid lead or lead-bismuth alloys. As one of the six main types of fourth-generation reactors, lead-cooled fast reactors can well meet the requirements of safety, economy, sustainability and nuclear non-proliferation. They have attracted international attention and will have broad development in the future. space. Due to the harsh internal environment of lead-cooled fast reactors, in addition to high temperature, stress, and irra...

AI Technical Summary

Problems solved by technology

In view of the harsh service environment in lead-cooled fast reactors, fastener materials are required to have high high-temperature strength, good durability resistance, and more importantly, excellent liquid lead-bismuth corrosion resistance and stress relaxation resistance. The difficulty is that there are no steel types for reference and reference at home and abroad.

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