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Nickel-based alloy large cross-section bar for nuclear power key equipment and manufacturing method thereof

A technology of nickel-based alloys and manufacturing methods, which is applied to the composition and manufacture of super-large cross-section nickel-based alloy rods, and the field of nuclear power plant blasting valve shear covers. The compactness of the alloy and the effect of improving the overall uniformity

Active Publication Date: 2020-05-12
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] As for the production method of nickel-based alloy large-section rods for blasting valve shear caps of key nuclear power equipment, foreign companies have kept strict confidentiality, and have not made relevant reports, and there are no relevant patent documents and introductions.

Method used

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  • Nickel-based alloy large cross-section bar for nuclear power key equipment and manufacturing method thereof
  • Nickel-based alloy large cross-section bar for nuclear power key equipment and manufacturing method thereof
  • Nickel-based alloy large cross-section bar for nuclear power key equipment and manufacturing method thereof

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Embodiment 1

[0064] According to the composition described in the content of the present invention, the alloy electrode rod was melted and casted by vacuum induction, and the electroslag remelting furnace was protected by argon gas, and remelted into an electroslag remelting steel ingot with a diameter of 650 mm. The obtained alloy composition is shown in Table 3.

[0065] The large electroslag remelted steel ingot is heated and held at 1150°C for 5 hours, then out of the furnace for forging, and the three axes are upset once, and the deformation of each fire is guaranteed to be (30±5)%; the last heat is heated at 1050°C , The amount of deformation is 40%, and finally it is forged into a bar with a diameter of 330mm. The solution heat treatment temperature is 1035°C, and the heat preservation is 150min; the supplementary heat treatment is 730°C, and the heat preservation is 10h. The properties of the bars are shown in Table 4.

Embodiment 2

[0067] According to the composition described in the content of the present invention, vacuum induction melting was used to cast alloy electrode rods, and argon gas was used to protect the electroslag remelting furnace to remelt into an electroslag remelting steel ingot with a diameter of 900mm. The obtained alloy composition is shown in Table 3.

[0068] The large electroslag remelting steel ingot is heated and held at 1200°C for 8 hours and then out of the furnace for forging. The three axes are upset twice, and the deformation of each fire is guaranteed to be (40±5)%; the last heat is heated at 1080°C , The amount of deformation is 50%, and finally it is forged into a bar with a diameter of 450mm. The solution heat treatment temperature is 1060°C, and the heat preservation is 240min; the supplementary heat treatment is 720°C, and the heat preservation is 10h. The properties of the bars are shown in Table 4.

Embodiment 3

[0070] According to the composition described in the content of the present invention, vacuum induction melting was used to cast alloy electrode rods, and argon gas was used to protect the electroslag remelting furnace to remelt into an electroslag remelting steel ingot with a diameter of 900mm. The obtained alloy composition is shown in Table 3.

[0071] The large electroslag remelted steel ingot is heated and held at 1150°C for 8 hours and then out of the furnace for forging, and the three axes are upset twice, and the deformation of each fire is guaranteed to be (50±5)%; the last heat is heated at 1040°C , The amount of deformation is 45%, and finally it is forged into a bar with a diameter of 530mm. The solution heat treatment temperature is 1080°C, and the heat preservation is 260min; the supplementary heat treatment is 725°C, and the heat preservation is 11h. The properties of the bars are shown in Table 4.

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Abstract

The invention provides a nickel-based alloy used for nuclear power critical equipment and a manufacturing method of a nickel-based alloy bar. The alloy comprises the following elements: C, Cr, Fe, W and the balance Ni and unavoidable impurities, wherein the content of Ni is not less than 58%. The preparation method of the bar includes the following steps of nickel-based alloy preparation, hot rolling and forming of the bar and heat treatment of the bar. Compared with the prior art, the nickel-based alloy and the manufacturing method has the following advantages that the manufacture process isespecially suitable for manufacturing large-section nickel-based alloy bar of Phi 300 mm to Phi660 mm, and the nickel-based alloy bar is completely applicable to key components of nuclear island equipment in nuclear power plants and of great significance for effectively promoting the independent construction of large nuclear power plants in China.

Description

technical field [0001] The invention relates to the technical field related to the manufacture of nickel-based corrosion-resistant alloy rods, in particular to the composition and manufacturing method of a super-large-section nickel-based alloy rod with special performance requirements, which can be used to manufacture nuclear power plants with extremely strict technical requirements Blast valve shear cap. It specifically covers the composition, smelting method, key technology of forging and heat treatment of large cross-section nickel-based alloy rods. Background technique [0002] Nuclear power is an advanced clean energy, an important part of the national energy strategy, and one of the most important measures to achieve the national energy conservation and emission reduction goals. The general design life of nuclear power equipment is 60 years. Due to the excellent high temperature resistance and corrosion resistance of nickel-based alloys, a large number of key compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/053C22C19/055C22F1/10
Inventor 徐长征马天军张健英杨桦童英豪高雯杨磊唐在兴
Owner 宝武特种冶金有限公司
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