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Improved structural material martensite heat-resistant steel and manufacture method thereof

A technology of structural material and martensite, which is applied in the field of structural material martensitic heat-resistant steel and its preparation, to achieve the effect of improving high temperature performance, good high temperature resistance strength, improving power generation efficiency and safety

Active Publication Date: 2013-01-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the existing martensitic heat-resistant steel, an improved structural material martensitic heat-resistant steel is proposed by refining the MX-type precipitates. Significantly improved

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The first step: According to the component distribution ratio (C 0.10%, Mn 0.45%, Si 0.30%, Cr 9.0%, Mo 1.0%, V 0.20%, Ta 0.10%, Nb 0.05%, N 0.01%, P≤0.02%, S≤0.01%, Al≤0.04%, Ni≤0.4%, the balance is Fe) and the alloy burning loss are equipped with raw materials.

[0019] The second step: In the vacuum induction furnace, the alloy raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloy elements, and the ingots with qualified composition are prepared by smelting. Feeding principle: Add after fully deoxidizing the easily oxidizable alloy elements, and add after the volatile alloy elements are protected by the atmosphere or after the vacuum is stopped at the end of smelting.

[0020] The third step: forging and rolling to prepare the required profiles:

[0021] Forging: initial forging temperature is 1150℃, holding time is 1h, final forging temperature is 900℃, forging ratio is 5;

[0022] Rolling: annealing temperature 1...

Embodiment 2

[0027] The first step: According to the composition ratio (C 0.15%, Mn 0.50%, Si 0.35%, Cr 8.5%, Mo 1.05%, V 0.25%, Ta 0.15%, N 0.005%, P≤0.02%, S≤0.01% , Al≤0.04%, Ni≤0.4%, the remainder is Fe) and the alloy burning loss is equipped with raw materials.

[0028] The second step: In the vacuum induction furnace, the alloy raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloy elements, and the ingots with qualified composition are prepared by smelting. Feeding principle: Add after fully deoxidizing the easily oxidizable alloy elements, and add after the volatile alloy elements are protected by the atmosphere or after the vacuum is stopped at the end of smelting.

[0029] The third step: forging and rolling to prepare the required profiles:

[0030] Forging: initial forging temperature 1150℃, holding time 70min, final forging temperature 850℃, forging ratio 6;

[0031] Rolling: annealing temperature 1050℃, holding time 75min, ...

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Abstract

Provided are improved structural material martensite heat-resistant steel and a manufacture method thereof. The improved structural material martensite heat-resistant steel utilizes Fe to serve as a matrix, comprises 0.05-0.15% of C, 0.30-0.60% of Mn, 0.20-0.50 % of Si, 8.0-9.5% of Cr, 0.85-1.05% of Mo, 0.18-0.25% of V, 0.05-0.30% of Ta+Nb and 0.003-0.07 of N, has excellent high-temperature performance and corrosion resistance, and is resistant to strong neutron irradiation. According to the formula of the structural steel, a microalloy element Ta partially or completely replaces Nb in T / P91, refining is performed on an MX type precipitated phase, thermal stable performance of the structural steel improved, and accordingly, high-temperature performance of materials and safe reliability when the materials are used at the high temperature are further improved. Therefore, the improved structural material martensite heat-resistant steel is applicable to ammunition delivery system (ADS) reactor and other advanced reactor and applicable to other high-temperature environments simultaneously.

Description

Technical field [0001] The invention relates to a structural material martensitic heat-resistant steel and a preparation method thereof, which have good high temperature resistance strength (creep and thermal fatigue), corrosion resistance and oxidation resistance, and can resist strong neutron radiation. It is suitable for ADS reactors, and also suitable for use in other advanced reactors and high temperature environments. Background technique [0002] The ADS reactor is a new type of nuclear energy system that transforms nuclear waste and produces clean nuclear energy. Its unique irradiation conditions and corrosion problems place more stringent requirements on candidate structural materials. At present, the international research on structural materials for ADS reactors mainly focuses on martensitic / ferritic heat-resistant steel. Its main feature is to reduce the carbon content on the basis of traditional heat-resistant steel, strictly limit the content of sulfur and phosphoru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/46C22C38/26C22C38/24C21D1/18
Inventor 刘少军黄群英夏志新李春京吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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