一种大厚度Z向易焊接核电承压设备用钢及其制备方法

By designing specific components and employing advanced processes, the problems of component segregation and uneven microstructure in steel used for thick nuclear power pressure equipment were solved, resulting in high-strength, easily weldable nuclear power steel plates that meet the safety and stability requirements of nuclear power equipment.

CN116732432BActive Publication Date: 2026-07-17ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANGANG STEEL CO LTD
Filing Date
2023-05-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

How to produce thick, easily weldable high-strength steel plates for nuclear power pressure equipment with dense structure, clean steel quality, uniform performance, and suitable welding properties, especially to solve the problems of component segregation, coarse grains, and excessive non-metallic inclusions in steel ingots in existing technologies.

Method used

By employing specific composition design and process flow, including high-purity steel smelting, continuous casting billet composite, controlled rolling and cooling, and quenching and tempering heat treatment, the P and S content in the steel is controlled, and appropriate amounts of Nb, V, Ti and other elements are added. Combined with suitable heat treatment processes, the uniformity of steel plate structure and weldability are ensured.

Benefits of technology

The prepared steel has high purity, low center segregation of the billet, and uniform and fine microstructure, exhibiting excellent mechanical and weldability properties, meeting the requirements for use in nuclear power pressure equipment.

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Abstract

本发明提供一种大厚度Z向易焊接核电承压设备用钢及其制备方法，所述钢的成分及其质量百分比为：C：0.06～0.12％；Si：0.25～0.40％；Mn：1.15～1.55％；P≤0.015％；S≤0.005％；Ni：0.40～0.65％；Mo：0.25～0.45％；V：0.04～0.06％；Als：0.020～0.050％；Nb：0.015～0.035％；Ti：0.015～0.025％；RE：0.004～0.018％，余量为Fe和不可避免的杂质。本发明提供的钢板为组织致密、钢质洁净、性能均匀的高强度钢板，且为大厚度易焊接核电承压设备用钢。
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