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Hard nickel-base alloy resistant to wear and corrosion
| Details |
Inventors: Crook, Paul;
Assignee: Cabot Corporation (Kokomo, IN)
Primary Examiner: Dean; R.
Assistant Examiner:
Attorney, Agent or Firm: Schuman; Jack, Phillips; Joseph J.
Disclosed is a hard wear resistant nickel based alloy including a carbide-former, preferably niobium, and essentially cobalt free but which has similar properties to cobalt, chromium, tungsten, carbon alloys. Typically the alloy has a composition, in parts by weight, Cr-34 C-1.2, Mo-10, Fe-3, Si-1, Nb-3, Ni-balance. The alloys of the invention are suitable for surface or welding consumables, and as articles for making hardfacing depositions. |
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DETAILED DESCRIPTION What is claimed is: 1.
A nickel-based hard alloy consisting essentially of the following composition (excluding impurities)
______________________________________
% by weight
of composition
______________________________________
(a) chromium 32 to 40
(b) molybdenum plus tungsten
8 to 15
(c) carbon 0.
55 to 2.
5
(d) one or more elements 1 to 7.
5
selected from the group
consisting of niobium,
titanium, vanadium, tantalum,
hafnium and zirconium
(e) silicon plus manganese
0 to 5
(f) copper up to 5
(g) aluminium 0 to 2
(h) one or more elements selected
0 to 2
from the group consisting
of the rare earths
(i) boron 0 to 1
(j) iron 0 to 25
(k) nickel balance
______________________________________
wherein (1) there is at least 42% by weight of the nickel in the composition: (2) the combined weight of boron (if present) and carbon is not greater than 2.
5%; (3) one or more elements from the group consisting of vanadium, tantalum, hafnium and zirconium are present only when the carbon content exceeds 1.
0%; said alloy being cobalt-free except as an adventitious impurity and made by first melting the alloy and then casting the molten alloy into a useful form.
2.
An alloy as claimed in claim 1 in which the composition contains from 0.
4% to 2.
5% by weight of silicon plus manganese.
3.
An alloy as claimed in claim 1 containing from 0.
9 to 1.
5% by weight of carbon.
4.
An alloy as claimed in claim 1, containing up to 5% by weight of iron.
5.
An alloy as claimed in claim 1 in which the rare earth is yttrium.
6.
An alloy as claimed in claim 1 containing from 1 to 4% by weight of one or more elements selected from the group consisting of niobium, vanadium, hafnium, tantalum, titanium and zirconium
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