Steel plate for evaporator of advanced nuclear power unit and its manufacturing method

A steel plate with tailored chemical composition and manufacturing process addresses the high-temperature and high-performance needs of fourth-generation nuclear power plants, ensuring high-temperature temper embrittlement resistance and mechanical stability.

JP7828468B2Active Publication Date: 2026-03-11ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-05-10
Publication Date
2026-03-11

AI Technical Summary

Technical Problem

Existing steel materials for nuclear power plant evaporators, particularly those designed for third-generation reactors, cannot meet the high-temperature and high-performance requirements of fourth-generation nuclear power plants, including high internal cleanliness, small anisotropy, and excellent high-temperature toughness and fatigue resistance after post-weld heat treatment.

Method used

A steel plate with a specific chemical composition and manufacturing process, incorporating medium to low C, Si, and Mn components, along with controlled amounts of Cr, Mo, Ni, Nb, V, Ti, and N, and strict control of harmful elements P, S, Sn, O, and H, combined with unique smelting, rolling, and heat treatment processes, to achieve high strength, high-temperature fatigue resistance, and low-temperature toughness.

Benefits of technology

The steel plate exhibits high-temperature temper embrittlement resistance, maintaining mechanical integrity under extreme conditions, with tensile strengths of 422-435 MPa at 530°C and over 1.1 million cycles at 530°C, meeting the demanding specifications of fourth-generation nuclear power plants.

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Abstract

The present invention provides a steel plate for an evaporator of an advanced nuclear power unit and a manufacturing method thereof. The composition of the present invention is, in mass%, C: 0.10%-0.14%, Si: 0.10%-0.25%, Mn: 0.25%-0.50%, P≦0.006%, S≦0.002%, Cr: 1.80%-2.10%, Mo: 1.00%-1.35%, Ni: 0.80%-1.20%, Nb: 0%-0.04%, V: 0.05%- 0.10%, Ti: 0.03%~0.06%, Alt: 0%~0.02%, Ca: 0.001%~0.004%, N: 0.01%~0.03%, Sn≦0.001%, H≦0.0001%, O≦0.0020%, balance: Fe and unavoidable impurities. High temperature temper embrittlement resistance coefficient J=(Si+Mn)×(P+Sn)×10 4 ≦50. The manufacturing method of the present invention can ensure the comprehensive performance requirements of the evaporator steel plate of advanced nuclear power unit.
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Citation Information

Patent Citations

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  • Method for adding additive into molten steel during vacuum degassing treatment

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  • High-strength steel slab and casting method therefor

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