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US 9,284,631 B2Granted
Hypereutectic white iron alloys comprising chromium and nitrogen and articles made therefrom
OwnerRoman Radon, Raphael Radoninventors
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Abstract
Disclosed are a hypereutectic white iron alloy and articles such as pump components made therefrom. Besides iron and unavoidable impurities the alloy comprises, in weight percent based on the total weight of the alloy, from 2.5 to 6.5 C, from 0.04 to 1.2 N and from 18 to 58 Cr and, optionally, one or more of Mn, Ni, Co, Cu, Mo, W, V, Mg, Ca, Si, rare earth elements, Nb, Ta, Ti, Zr, Hf, Al, B.
Claims25
A hypereutectic white iron alloy, wherein the alloy comprises, in weight percent based on a total weight of the alloy:
- C
- from 4.2 to 6.5
- N
- from 0.04 to 1.2
- Cr
- from 31 to 44
- Mn
- from 0 to 8
- Ni
- from 0 to 5
- Co
- from 0 to 5
- Cu
- from 0 to 5
- Mo
- from 0 to 5
- W
- from 0 to 6
- V
- from 0 to 12
- Nb
- from 0 to 6
- Ti
- from 0 to 5
- (Mg + Ca)
- from 0 to 0.2
- Si
- from 0 to 3
- one or more rare earth elements
- from 0 to 3
- one or more of Ta, Zr, Hf, Al, B
- from 0 to 3
- remainder Fe and unavoidable impurities, provided that a carbonitride volume fraction (CNVF):
- (% C+% N)×12.33+(% Cr+% M)×0.55−15.2 equals at least 50, % M representing a total percentage of V, Mo, Nb, and Ti.
31 more elements
Dependencies are inferred from the claim text.