Steel for nuclear reactor pressure vessel and preparation method of steel

A technology for pressure vessels and nuclear reactors, applied in the field of steel for pressure vessels, can solve the problems of production, weight increase, shallow hardening depth on both sides, etc., and achieve the effect of improving structure uniformity and performance

Inactive Publication Date: 2016-12-07
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing nuclear reactor pressure vessel material steel has poor hardenability and shallow hardening depth on both sides. During the quenching heat treatment process, especially when the thickness of the material is greater than 500mm, it is difficult to completely transform into a martensitic structure; when the material When the martensite structure cannot be completely obtained, the quenching and tempering treatment cannot form a uniform structure, which will lead to uneven mechanical properties, especially at the 1/2 thickness of the material, where the performance is the worst, and the low temperature impact toughness is poor
[0005] In order to make up for the defects in performance, the th

Method used

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  • Steel for nuclear reactor pressure vessel and preparation method of steel
  • Steel for nuclear reactor pressure vessel and preparation method of steel
  • Steel for nuclear reactor pressure vessel and preparation method of steel

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preparation example Construction

[0042] The present invention provides the preparation method of the nuclear reactor pressure vessel steel that above-mentioned technical solution provides, comprises the following steps:

[0043] (1) Provide an alloy comprising the components defined in the above technical solution;

[0044] (2) heating the alloy, and performing first-stage forging in the recrystallization zone, the cumulative deformation of the first-stage forging is 200% to 350%;

[0045] (3) Carry out the second-stage forging in the non-recrystallized area and then air-cool to obtain a preheated steel ingot, the cumulative deformation of the second-stage forging is 50% to 150%:

[0046] (4) The preheated steel ingot obtained in the step (3) is subjected to conditioning treatment, the quenching temperature of the tempering treatment is 930-950°C, and the tempering temperature of the tempering treatment is 650-670°C.

[0047] In the present invention, the alloy comprising the components defined in the above ...

Embodiment 1

[0062] The molten steel is smelted in an electric furnace, refined outside the furnace and vacuum treated, and cast into steel ingots containing the components shown in Table 1. At the same time, non-metallic inclusions in steel are inspected: Class A 0.5, Class B 0.5, Class C 0.5, Class D 1.0.

[0063] Heating to 1250°C, the first-stage forging is carried out in the recrystallization zone, the initial forging temperature is 1220°C, the final forging temperature is 1000°C, the cumulative deformation of the first-stage forging is 350%, and then the temperature is lowered to 870°C for the second stage Two-stage forging with a cumulative deformation of 50%. After the forging is completed, the thickness of the forged piece obtained by air cooling is 20mm.

[0064] Quenching and tempering treatment: raise the temperature to 940°C for 60 minutes of heat preservation treatment to complete the water cooling to complete the quenching process, then heat to 660°C for 80 minutes and then...

Embodiment 2

[0075] The molten steel is smelted in an electric furnace, refined outside the furnace and vacuum treated, and cast into steel ingots containing the components shown in Table 3. At the same time, non-metallic inclusions in steel are inspected: Class A 0.5, Class B 0.5, Class C 0.5, Class D 1.0.

[0076] Heating to 1200°C, the first-stage forging is carried out in the recrystallization zone, the initial forging temperature is 1220°C, the final forging temperature is 1000°C, the cumulative deformation of the first-stage forging is 200%, and then the temperature is lowered to 870°C for the second stage For two-stage forging, the cumulative deformation is 100%. After the forging is completed, the thickness of the forged piece obtained by air cooling is 20mm.

[0077] Quenching and tempering treatment: raise the temperature to 960°C for 60 minutes of heat preservation treatment to complete the water cooling to complete the quenching process, then heat to 650°C for 80 minutes and t...

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Abstract

The invention provides steel for a nuclear reactor pressure vessel. The steel comprises, by mass, 0.12-0.20% of C, 0.05-0.15% of Si, 0.25-0.40% of Mn, 0-0.006% of P, 0-0.004% of S, 3.0-3.9% of Ni, 1.5-2.9% of Cr, 0.45-0.70% of Mo, 0.01-0.02% of Al, and the balance Fe. According to the steel for the nuclear reactor pressure vessel, on the basis of the limited components, the hardenability is improved remarkably, coordination and cooperation between all the components are guaranteed, and the effect that the function of each component is brought into full play when each component exists alone is guaranteed; and the size, distribution state, shape and content of precipitated carbide in the phase change process are affected by coordination and cooperation of all the components, and accordingly the structure performance is affected.

Description

technical field [0001] The invention belongs to the technical field of steel for pressure vessels, and in particular relates to a steel for nuclear reactor pressure vessels and a preparation method thereof. Background technique [0002] With the rapid economic development of various countries and the expansion of the limitations of traditional energy sources, nuclear energy, as the most promising energy source for human beings, has been favored by all countries, and all countries have increased the development and utilization of nuclear energy. [0003] The nuclear reactor pressure vessel is the main support structure of the nuclear reactor core. It transmits the heat released by the core through the cooling circulating water to drive the generator set to generate electricity. It is the second safety barrier for the core. The steel used for nuclear reactor pressure vessels is mostly Mn-Ni-Mo low-alloy steel with a carbon content of 0.2%, which belongs to the third generation...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/18C22C38/12C22C38/06C22C38/02C22C38/04C21D8/00
CPCC21D6/004C21D8/005C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18
Inventor 陈重毅麻永林邢淑清白庆伟王卫东
Owner INNER MONGOLIA UNIV OF SCI & TECH
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