Acid and alkali resistant Ni—Cr—Mo—Cu alloys with critical contents of chromium and copper
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C22C-019/05
C22F-001/10
출원번호
US-0055126
(2013-10-16)
등록번호
US-9399807
(2016-07-26)
발명자
/ 주소
Crook, Paul
Deodeshmukh, Vinay
출원인 / 주소
Haynes International, Inc.
대리인 / 주소
Buchanan Ingersoll & Rooney PC
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A nickel—chromium—molybdenum—copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C. for acid and alkali neutralization in the field of waste management; the alloy contains, in weight percent, 27 to 33 chromium, 4.9 to 7.8 molybdenum, 3.1 to 6.0 wt. % copper (when c
A nickel—chromium—molybdenum—copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C. for acid and alkali neutralization in the field of waste management; the alloy contains, in weight percent, 27 to 33 chromium, 4.9 to 7.8 molybdenum, 3.1 to 6.0 wt. % copper (when chromium is between 30 and 33 wt. %) or 4.7 to 6.0 wt. % copper (when chromium is between 27 and 29.9 wt. %), up to 3.0 iron, 0.3 to 1.0 manganese, 0.1 to 0.5 aluminum, 0.1 to 0.8 silicon, 0.01 to 0.11 carbon, up to 0.13 nitrogen, up to 0.05 magnesium, up to 0.05 rare earth elements, with a balance of nickel and impurities. Titanium or another MC carbide former can be added to enhance thermal stability of the alloy.
대표청구항▼
1. A nickel-chromium-molybdenum-copper alloy resistant to sulfuric acid, having a corrosion rate of less than 0.45 mm/y in 70% sulfuric acid at 93° C. and resistant to sodium hydroxide, having a maximum internal attack corresponding to corrosion rate of less than 0.45 mm/y in 50% sodium hydroxide at
1. A nickel-chromium-molybdenum-copper alloy resistant to sulfuric acid, having a corrosion rate of less than 0.45 mm/y in 70% sulfuric acid at 93° C. and resistant to sodium hydroxide, having a maximum internal attack corresponding to corrosion rate of less than 0.45 mm/y in 50% sodium hydroxide at 121° C., consisting essentially of: 27 and 29.9 wt. % chromium4.9 to 7.8 wt. % molybdenum4.7 to 6.0 wt. % copperup to 3.0 wt. % iron0.3 to 1.0 wt. % manganese0.1 to 0.5 wt. % aluminum0.1 to 0.8 wt. % silicon0.01 to 0.11 wt. % carbonup to 0.13 wt. % nitrogenup to 0.05 wt. % magnesiumup to 0.05 wt. % rare earth elementsup to 0.56 wt. % titaniumup to 1.12 wt. % niobiumup to 2.24 wt. % tantalumup to 2.24 wt. % hafniumwith a balance of nickel and impurities. 2. The nickel-chromium-molybdenum-copper alloy of claim 1, wherein the alloys are in wrought forms selected from the group consisting of sheets, plates, bars, wires, tubes, pipes, and forgings. 3. The nickel-chromium-molybdenum-copper alloy of claim 1, wherein the alloy is in cast form. 4. The nickel-chromium-molybdenum-copper alloy of claim 1, wherein the alloy is in powder metallurgy form. 5. The nickel-chromium-molybdenum-copper alloy of claim 1, wherein the alloy contains at least one MC carbide former. 6. The nickel-chromium-molybdenum-copper alloy of claim 5, wherein the MC carbide former is selected from the group consisting of titanium, niobium, tantalum and hafnium. 7. The nickel-chromium-molybdenum-copper alloy of claim 6, the alloy consisting essentially of 0.20 to 0.56 wt. % titanium. 8. The nickel-chromium-molybdenum-copper alloy of claim 6, the alloy consisting essentially of 0.30 to 1.12 wt. % niobium. 9. The nickel-chromium-molybdenum-copper alloy of claim 1, the alloy consisting essentially of 0.60 to 2.24 wt. % tantalum. 10. The nickel-chromium-molybdenum-copper alloy of claim 1, the alloy consisting essentially of 0.60 to 2.24 wt. % hafnium. 11. The nickel-chromium-molybdenum-copper alloy of claim 1, wherein the impurities are selected from the group consisting of cobalt, tungsten, sulfur, phosphorous, oxygen and calcium.
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