Welding material for Ni-based alloy

A technology for welding materials and base alloys, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve problems such as difficulty in achieving heat resistance, achieve excellent weldability, and prevent hot cracks.

Inactive Publication Date: 2011-06-22
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such high-temperature steam above 650°C is applied, it is difficult for a rotor formed of 12Cr steel to achieve sufficient heat-resistant strength

Method used

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  • Welding material for Ni-based alloy
  • Welding material for Ni-based alloy

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0025] The welding material for Ni-based alloys of the first embodiment has the following composition: C≤0.05% by mass, 8% by mass≤Cr≤25% by mass, Fe≤4.0% by mass, W≤15% by mass, 5% by mass≤Mo+1 / 2(W+Re)≤20 mass%, Co≤20 mass%, 0.01 mass%≤Al<2.0 mass%, 0.01 mass%≤Ti<2.0 mass%, Al+1 / 2Ti≤3.0 mass%, Nb+ 1 / 2Ta≤1.5 mass%, B≤0.007 mass%, Zr≤0.04 mass%, 0.01 mass%≤Si≤0.5 mass%, Mn≤1.0 mass%, P≤0.010 mass%, S≤0.002 mass%, O≤ 0.005% by mass, and the balance is Ni and unavoidable impurities.

[0026] C (carbon) has the effect of strengthening the solid solution to increase the tensile strength. However, its excess leads to a decrease in hot workability accompanied by the generation of carbides. Therefore, its content is set to 0.05% by mass or less.

[0027] Cr (chromium) has an effect of improving corrosion resistance. However, its excess leads to increased susceptibility to thermal cracking during welding and increased thermal expansion coefficient. Therefore, the content thereof ...

no. 2 approach

[0042] The welding material for Ni-based alloys of the second embodiment has the following composition: C≤0.05% by mass, 8% by mass≤Cr≤25% by mass, Fe≤4.0% by mass, W≤15% by mass, 5% by mass≤Mo+1 / 2(W+Re)≤20% by mass, Co≤20% by mass, 0.01% by mass≤Al<2.0% by mass, 0.01% by mass≤Ti<2.0% by mass, Al+1 / 2Ti≤3.0% by mass, 1.5% by mass %

[0043] In short, the welding material for Ni-based alloys of the above-mentioned first embodiment has a composition in which Nb and Ta satisfy "Nb+1 / 2Ta≤1.5% by mass", while the welding material for Ni-based alloys of this embodiment has Nb and Ta A composition satisfying both "1.5% by mass

[0044] As described above, Nb and Ta have the effect of supp...

no. 3 approach

[0048] The welding material for a Ni-based alloy of the third embodiment is the welding material for a Ni-based alloy of the second embodiment whose composition further satisfies N≦0.03% by mass and C+N≦0.05% by mass. N (nitrogen) has the effect of strengthening the solid solution and increasing the tensile strength as in the case of C, and also has the effect of reducing the resistance to hot cracking during welding in such a way that the structure of the weld metal portion is made finer by forming nitrides. The role of sensitivity. However, its excess brings about the appearance of pores, and embrittlement due to an increase in tensile strength. Therefore, its content is set to 0.03% by mass or less, and the total content of N and C is set to 0.05% by mass or less.

[0049] Therefore, as in the case of the above-mentioned second embodiment, the welding material for Ni-based alloys of the present embodiment is excellent in weldability to austenitic Ni-based alloys with a low...

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Abstract

Disclosed is a welding material for a Ni-based alloy, which comprises the following components: C <= 0.05 mass%, 8 mass% <= Cr <= 25 mass%, Fe <= 4.0 mass%, W <= 15 mass%, 5 mass% <= Mo+1 / 2(W+Re) <= 20 mass%, Co <= 20 mass%, 0.01 mass% <= Al < 2.0 mass%, 0.01 mass% <= Ti < 2.0 mass%, Al+1 / 2Ti <= 3.0 mass%, Nb+1 / 2Ta <= 1.5 mass%, B <= 0.007 mass%, Zr <= 0.04 mass%, 0.01 mass% <= Si = 0.5 mass%, Mn <= 1.0 mass%, P <= 0.010 mass%, S <= 0.002 mass%, and 0 <= 0.005 mass%, with the remainder being Ni and unavoidable impurities.

Description

technical field [0001] The invention relates to a welding material for Ni-based alloys, which is used for welding Ni-based alloys. Background technique [0002] In steam turbines and gas turbines, for example, rotors that should experience high temperatures are formed by mainly using ferritic 12Cr steel which is excellent in manufacturability and heat resistance strength and has a low coefficient of thermal expansion. For example, if figure 2 As shown in , the rotor 210 is manufactured by melting and forging as a whole formed from 12Cr steel (see figure 2 A). Alternatively, the rotor 220 is manufactured in the following manner: the main body portion 221 subjected to high temperature is formed from 12Cr steel by melting and forging; the shaft end portion 222 is formed from low alloy steel by melting and forging; and then the main body portion 221 and the shaft Ends 222 are welded together (see figure 2 B). [0003] In this regard, in order to improve thermal efficiency i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30C22C19/05F01D25/00F02C7/00
CPCF01D5/063Y02T50/671B23K35/24B23K35/3033C22C19/055B23K2203/08C22C19/05C22C19/056B23K2201/001B23K2101/001B23K2103/08B23K2103/26Y02T50/60B23K35/30F01D25/00F02C7/00
Inventor 川崎宪治山本隆一角屋好邦西本慎川口圣一
Owner MITSUBISHI HEAVY IND LTD
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