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Low-activity martensitic steel with high-temperature mechanical performance and heat treatment process

A technology of mechanical properties, martensitic steel, applied in the field of low activation martensitic steel with high temperature mechanical properties and heat treatment process, can solve the problem of inability to quickly enter the industrial application stage, poor stability between batches, single batch Small output and other problems, to achieve the effect of large-scale industrial production, simple method and good industrial base

Active Publication Date: 2016-11-16
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

Oxide dispersion strengthening (ODS) is currently generally believed to be a technology that can effectively increase the service temperature of low-activation steel. However, due to the limitations of the preparation process and technology, ODS steel has a small single-batch output and poor batch-to-batch stability. Small size, unable to quickly enter the stage of industrial application

Method used

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  • Low-activity martensitic steel with high-temperature mechanical performance and heat treatment process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) According to the composition ratio: Cr 9.0%, W 1.5%, V 0.2%, Ta 0.15%, Mn 0.45%, C0.10%, N 0.01~0.05%, Ni≤0.005%, Nb≤0.001%, Co ≤0.005%, Cu≤0.005%, Mo≤0.005%, P≤0.005%, S≤0.005%, O≤0.01%, Al≤0.01%, and the rest is Fe element and alloy burning loss ratio raw materials.

[0016] (2) In the vacuum induction furnace, raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloy elements. The easy-to-oxidize alloy elements are added after they are fully deoxidized. The volatile alloy elements are added under the protection of the atmosphere or at the end of the smelting process. After smelting, an ingot with qualified composition is prepared.

[0017] (3) The prepared ingot is smelted by vacuum consumable arc to further reduce the impurity content.

[0018] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150°C, the heat preservation is 60min, and the final forging temperature is 850°C. ...

Embodiment 2

[0025] (1) According to the composition ratio: Cr 9.0%, W 1.5%, V 0.2%, Ta 0.15%, Mn 0.45%, C0.10%, N 0.01~0.05%, Ni≤0.005%, Nb≤0.001%, Co ≤0.005%, Cu≤0.005%, Mo≤0.005%, P≤0.005%, S≤0.005%, O≤0.01%, Al≤0.01%, and the rest is Fe element and alloy burning loss ratio raw materials.

[0026] (2) In the vacuum induction furnace, raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloy elements. The easy-to-oxidize alloy elements are added after they are fully deoxidized. The volatile alloy elements are added under the protection of the atmosphere or at the end of the smelting process. After smelting, an ingot with qualified composition is prepared.

[0027] (3) The prepared ingot is smelted by vacuum consumable arc to further reduce the impurity content.

[0028] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150°C, the heat preservation is 60min, and the final forging temperature is 850°C. ...

Embodiment 3

[0035](1) According to the composition ratio: Cr 9.0%, W 1.5%, V 0.2%, Ta 0.15%, Mn 0.45%, C0.10%, N 0.01~0.05%, Ni≤0.005%, Nb≤0.001%, Co ≤0.005%, Cu≤0.005%, Mo≤0.005%, P≤0.005%, S≤0.005%, O≤0.01%, Al≤0.01%, and the rest is Fe element and alloy burning loss ratio raw materials.

[0036] (2) In the vacuum induction furnace, raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloy elements. The easy-to-oxidize alloy elements are added after they are fully deoxidized. The volatile alloy elements are added under the protection of the atmosphere or at the end of the smelting process. After smelting, an ingot with qualified composition is prepared.

[0037] (3) The prepared ingot is smelted by vacuum consumable arc to further reduce the impurity content.

[0038] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150°C, the heat preservation is 60min, and the final forging temperature is 850°C. ...

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Abstract

The invention relates to low-activity martensitic steel with high-temperature mechanical performance and a heat treatment process. The low-activity martensitic steel comprises main components of 8.5-9.5% of Cr, 1.2-1.7% of W, 0.15-0.25% of V, 0.12-0.18% of Ta, 0.4-0.5% of Mn, (C+N) not more than 0.17% and not less than 0.09%, N less than 0.07% (wt.%), and the balance of Fe elements; and the purpose of controlling C and N is to form fine dispersed carbonitride in subsequent treatment to enhance the material high-temperature performance. Low-activity martensitic steel plates molded by rolling are heated to 1100+ / -50 DEG C, are insulated by 40-120 min according to different thicknesses and sizes to discharge from a furnace, are quickly cooled by water to reach the room temperature, are reheated to 740+ / -20 DEG C, are insulated by 90-140 min according to different thicknesses and sizes to discharge from the furnace, and are cooled by air to reach the room temperature. The high-temperature strength and the high-temperature durability of radiation-resistance low-activity steel are prominently improved to lay the foundation to the use temperature of the radiation-resistance low-activity steel.

Description

technical field [0001] The invention relates to a method for improving the composition of low-activation martensitic steel and a heat treatment process, which is a process for effectively improving the high-temperature strength and high-temperature durability of an anti-irradiation low-activation steel plate. Background technique [0002] Nuclear fusion energy is an almost inexhaustible permanent "safe" and "clean" energy, and it is one of the most promising energy sources in the future. Nuclear fusion reactor cladding, especially cladding structure materials, is one of the core scientific and technological issues that must be developed for fusion reactors to eventually be commercially applied. Nuclear fusion reactor cladding structure materials face harsh environments such as high-energy neutron irradiation, high temperature, high heat flux, and complex mechanical loads. Low-activation ferritic / martensitic steel (RAFM steel) is generally considered as a fusion reactor due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C22C38/24C22C38/22C22C38/04C21D6/00
CPCC21D6/002C21D6/005C22C38/04C22C38/22C22C38/24C22C38/26
Inventor 黄群英吴宜灿王伟徐刚刘少军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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