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Method for increasing low-temperature impact energy of nuclear reactor pressure vessel steel large-scale thick-wall forged piece

A technology for pressure vessels and nuclear reactors, applied in the field of heat treatment of steel, can solve the problems of deterioration of low-temperature toughness, microstructure differences, etc., and achieve the effects of improving low-temperature impact toughness, good mechanical properties, and high use safety margin value.

Active Publication Date: 2017-07-04
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

In addition, due to the solidification characteristics of large steel ingots, there is often obvious micro-domain composition segregation, which will lead to large differences in micro-domain structures, thereby deteriorating low-temperature toughness.

Method used

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  • Method for increasing low-temperature impact energy of nuclear reactor pressure vessel steel large-scale thick-wall forged piece
  • Method for increasing low-temperature impact energy of nuclear reactor pressure vessel steel large-scale thick-wall forged piece
  • Method for increasing low-temperature impact energy of nuclear reactor pressure vessel steel large-scale thick-wall forged piece

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Embodiment Construction

[0060] The method for increasing the low-temperature impact energy of a large thick-walled forging of a nuclear reactor pressure vessel steel of the present invention is suitable for thick-walled forgings whose material is SA-508Gr.

[0061] The first step is to smelt steel ingots;

[0062] The composition of steel ingot is (this text is all mass percent content):

[0063] C: 0.18~0.20%,

[0064] Mn: 1.40~1.50%,

[0065] P≤0.008%,

[0066] S≤0.005%,

[0067] Si: 0.25~0.40%,

[0068] Ni: 0.80~0.95%,

[0069] Cr≤0.25%,

[0070] Mo: 0.45~0.50%,

[0071] V≤0.05%,

[0072] Al: 0.020~0.030%,

[0073] N: 0.020~0.030%,

[0074] O≤0.003%,

[0075] H≤0.0002%;

[0076] The ASME SA508 / 508M (2004 edition) standard specifies the composition of SA-508Gr.3Cl.1, but the specified composition range is too broad, and the hot working characteristics of forgings fluctuating within its range have significant differences. The present invention further limits the composition of each elem...

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Abstract

The invention discloses a method for increasing low-temperature impact energy of a nuclear reactor pressure vessel steel large-scale thick-wall forged piece. The method includes the following steps that first, a steel ingot is smelted; second, the forged piece is forged; third, heat treatment after forging is conducted; and fourth, performance heat treatment is performed. By the adoption of the method, a tempering bainite structure with fine grains and well-closed formation can be obtained by means of chemical component control, high-temperature diffusion in the forging process and an apt heat treatment process, a good mechanical property (particularly the low-temperature impact energy) can be achieved, and therefore the low-temperature impact toughness of the pressure vessel forged piece can be improved, and the better quality stability and higher using safety margin value of the forged piece are guaranteed.

Description

technical field [0001] The invention relates to a heat treatment method for steel, in particular to a method for increasing the low-temperature impact energy of a large thick-walled forging of nuclear reactor pressure vessel steel. Background technique [0002] Vigorously developing nuclear power is an important measure to solve environmental problems and improve energy structure. With the evolution of nuclear power technology, in order to meet the requirements of power increase and safety margin increase, nuclear power reactor pressure vessel forgings are developing towards large-scale, integrated, thick-walled and high-performance. The third-generation CAP1000 nuclear reactor pressure vessel is made of SA-508Gr.3Cl.1 material, which has high low temperature toughness requirements. Taking the core barrel as an example, the quenched and tempered wall thickness is 266mm, and samples are required to be taken at 1 / 4T×T (T is the heat treatment wall thickness), and the average ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/08C22C38/04C22C38/02C22C38/12C22C38/06C21D6/00
CPCC21D6/001C21D6/005C21D6/008C21D2211/002C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 张智峰殷达义李向
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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