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Manufacturing method of high-temperature alloy forge piece for nuclear power steam generator

A technology of steam generator and high-temperature alloy, which is applied in the field of forging manufacturing

Active Publication Date: 2019-07-05
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's 800H alloy forgings for nuclear power high temperature gas-cooled reactor steam generators are completely dependent on imports, and have not yet been domestically produced, and there are few studies on 800H alloy forgings for nuclear power high temperature gas-cooled reactor steam generators at home and abroad, and related inclusions and grains These two aspects of degree control are rarely involved

Method used

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  • Manufacturing method of high-temperature alloy forge piece for nuclear power steam generator
  • Manufacturing method of high-temperature alloy forge piece for nuclear power steam generator
  • Manufacturing method of high-temperature alloy forge piece for nuclear power steam generator

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Experimental program
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Effect test

Embodiment 2

[0045] Such as figure 1 As shown, on the basis of Example 1, the forging heating temperature and heating and holding time of the 800H alloy forging are controlled.

[0046] It has been observed that the harmful inclusions in the 800H alloy begin to nucleate and grow during the solidification of the molten steel, and the inclusions will grow further after the molten steel solidifies. In addition, at about 1100 ° C, there will be M 23 C 6 Type carbides start to precipitate. For the case where the 800H alloy steel ingot used for the forging of the steam generator for the nuclear power high-temperature gas-cooled reactor has been cooled by passing cooling water through the steel ingot mold in the process of electroslag remelting, the cooling rate of the steel ingot is still limited due to the large size of the steel ingot. During the solidification and cooling process of molten steel, a certain degree of dendrite segregation will still be formed, the distribution of alloy elemen...

Embodiment 3

[0050] Such as figure 1 As shown, on the basis of Example 2, the final forging temperature of the 800H alloy forging and the cooling method of the forging after forging are controlled.

[0051] As mentioned earlier, 800H alloy forgings have M at around 1100°C 23 C 6 type carbide precipitation, in order to minimize the M 23 C 6 To prevent the precipitation of type carbides, the final forging temperature of the forging should be controlled above 1100°C as much as possible, and the forging should be water-cooled immediately after forging.

Embodiment 4

[0053] In the technology of embodiment three, for the M of 800H alloy forging 23 C 6 According to the precipitation characteristics of type carbides, a reasonable solution heat treatment process is designed.

[0054] For the 800H alloy used in the steam generator forgings of nuclear power high temperature gas-cooled reactors, the control of its high temperature mechanical properties largely depends on the selection of the heating rate of the forgings and the determination of the solid solution holding temperature and holding time of the forgings. Although the 800H alloy forging is water-cooled after forging, it is inevitable that there will be some M 23 C 6 Type carbides are precipitated in the alloy, especially for forgings with obvious main processing direction. According to its deformation characteristics, M 23 C 6 Type carbides are easy to precipitate in bands along the main processing direction of the forgings; in addition, if the 800H alloy forgings are heated at a s...

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Abstract

The invention discloses a manufacturing method of a high-temperature alloy forge piece for a nuclear power steam generator. The manufacturing method comprises the following steps 1, a 800H alloy forgepiece for a nuclear power high-temperature gas cooled reactor steam generator is provided; 2, by weight, the content of O is controlled to be less than or equal to 35 ppm, the content of N is controlled to be less than or equal to 130 ppm and the content of Nb is controlled to be less than or equal to 0.01%; and 3, by weight, the content of an Al element and the content of a Ti element are controlled to be 0.37-0.45% and 0.37-0.45% respectively. The finished forge piece prepared through the method meets the grain size and inclusion detection requirements of the 800H alloy forge piece for thenuclear power high-temperature gas cooled reactor steam generator, and the high-temperature mechanical property meets the standard detection requirements.

Description

technical field [0001] The invention relates to a method for manufacturing a forging, in particular to a method for manufacturing a superalloy forging used in a nuclear power steam generator. Background technique [0002] The 800H alloy is a Ni-Cr-Fe austenitic heat-resistant alloy developed by the American Special Metals Corporation (SMS) in the middle of the 19th century. Because its carbon content is higher than that of the 800 alloy, it has more excellent high temperature resistance and creep resistance. Variable and durable performance. By the end of 2018, the world's first high-temperature gas-cooled reactor steam generator was manufactured in my country, and the design and manufacture of nuclear power equipment in China has reached a new level. The steam generator is one of the most critical equipment in the high-temperature gas-cooled reactor nuclear power system. Its function is to convert the heat of the nuclear reactor into water vapor close to 600°C, and drive t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00C22C30/02
CPCB21J5/00C22C30/02
Inventor 陈美芳司梦丽陈卓陶志勇韩国盛陈华锋
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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