Low-activation bainitic steel applicable to neutron-irradiated environment and preparation method thereof

A bainitic steel, irradiation environment technology, applied in the field of metal materials, can solve the problems of large weld stress, high smelting cost, radioactive hazards, etc., to improve the deformation resistance, improve mechanical properties, and reduce hardenability. Effect

Active Publication Date: 2016-11-23
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

In order to meet the requirements of low activation, high-purity raw materials must be used for the smelting of low-activation martensitic steel. However, the alloy composition of low-activation martensitic steel is high, and the smelting cost is high.
In addition, after welding low-activation martensitic steel, the stress of the weld is relatively large, the hardness is high, the plasticity and toughness are poor, and heat treatment is required after welding, so it is not suitable for making large and complex parts
However, the existing T24 bainite steel does not have low activation characteristics because it contains long-period radioactive elements such as Mo. It will have potential radioactive hazards when used in nuclear power plants, and will increase the cost of post-processing radioactive nuclear waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) According to the composition ratio: Cr 2.5%, W 2.3%, V 0.20%, Ta 0.15%, Mn 0.50%, Si0.40%, C 0.10%, N 0.04%, P≤0.01%, S≤0.005% , O ≤ 0.005%, Al ≤ 0.01%, Ni ≤ 0.005%, Nb ≤ 0.001%, Co ≤ 0.005%, Cu ≤ 0.005%, Mo ≤ 0.005% (wt.%) and the burning loss ratio of the alloy raw materials.

[0020] (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.

[0021] (3) The prepared ingot is melted by vacuum consumable arc to further purify the material.

[0022] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150° C., the temperature is kept for 50 minutes, and the final forging temperature...

Embodiment 2

[0027] (1) According to the composition ratio: Cr 2.8%, W 2.5%, V 0.20%, Ta 0.15%, Mn 0.50%, Si0.40%, C 0.10%, N 0.04%, P≤0.01%, S≤0.005% , O ≤ 0.005%, Al ≤ 0.01%, Ni ≤ 0.005%, Nb ≤ 0.001%, Co ≤ 0.005%, Cu ≤ 0.005%, Mo ≤ 0.005% (wt.%) and the burning loss ratio of the alloy raw materials.

[0028](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.

[0029] (3) The prepared ingot is melted by vacuum consumable arc to further purify the material.

[0030] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150° C., the temperature is kept for 50 minutes, and the final forging temperature ...

Embodiment 3

[0035] (1) According to the composition ratio: Cr 3.0%, W 2.5%, V 0.20%, Ta 0.15%, Mn 0.50%, Si0.40%, C 0.10%, N 0.04%, P≤0.01%, S≤0.005% , O ≤ 0.005%, Al ≤ 0.01%, Ni ≤ 0.005%, Nb ≤ 0.001%, Co ≤ 0.005%, Cu ≤ 0.005%, Mo ≤ 0.005% (wt.%) and the burning loss ratio of the alloy 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 melted by vacuum consumable arc to further purify the material.

[0038] (4) Forging the ingot obtained in step (3), the initial forging temperature is 1150° C., the temperature is kept for 50 minutes, and the final forging temperature...

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Abstract

The invention discloses low-activation bainitic steel applicable to a neutron-irradiated environment and a preparation method thereof. A structural steel material has a matrix element of an element Fe, contains 2.5 to 3.5 percent (by weight) of Cr, 2.2 to 2.8 percent (by weight) of W, 0.2 to 0.25 percent (by weight) of V, 0.12 to 0.18 percent (by weight) of Ta, 0.40 to 0.80 percent (by weight) of Mn, 0.40 to 0.45 percent (by weight) of Si, 0.08 to 0.12 percent (by weight) of C and 0.01 to 0.05 percent (by weight) of N, and is suitably used in a fusion-reactor environment. Radioactive nuclides Mo, Ni, Cu, Nb and the like, which can be enabled to have long service life after being subjected to neutron irradiation, are strictly controlled in the componential formula of the steel, so as to guarantee that the low-activation bainitic steel applicable to the neutron-irradiated environment has a low-activation characteristic. A bainitic structural steel material has a favorable high-temperature property, particularly has a high-temperature croop property, can need no heat treatment after being welded, and is suitable for making large-sized components of a fusion-reactor vacuum container and the like.

Description

technical field [0001] The invention relates to a low-activation bainite steel suitable for neutron irradiation environments and a preparation method thereof, belonging to the field of metal materials. It is suitable for fusion reactors and also suitable for other reactors. Background technique [0002] Nuclear fusion energy, as an inexhaustible "clean" energy source, is currently a research hotspot in the world. In order to avoid the production of long-lived radionuclides after long-term neutron irradiation, fusion reactors require the structural materials used to be low-activation materials. Its purpose is to reduce the potential radioactive hazard caused by the activation of structural materials as much as possible, and reduce the reprocessing and cost of radioactive nuclear waste. Low activation steel mainly replaces elements such as Mo, Nb, Cu and Ni in general steel with W, Ta, V and Mn. Elements such as Mo, Nb, Cu, and Ni will produce long-lived radionuclides after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/04C22C38/02C22C38/06C22C38/08C22C38/10C22C38/16C21D1/18C21D8/00
CPCC21D1/18C21D8/005C21D2211/002C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/10C22C38/105C22C38/12C22C38/16C22C38/18
Inventor 吴宜灿黄群英徐刚王伟刘少军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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