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Castable corrosion resistant alloy
| Details |
Inventors: Culling, John H.;
Assignee: Carondelet Foundry Company (St. Louis, MO)
Primary Examiner: Andrews; Melvyn
Assistant Examiner: Koehler; Robert R.
Attorney, Agent or Firm: Senniger, Powers, Leavitt & Roedel
Austenitic stainless steel casting alloys which have excellent resistance to seawater, other chloride solutions, and a broad spectrum of other chemical substances, but which do not require solution heat treatments, after welding or other exposure to heat, such as in the slow cooling of large, rangy castings from the molten state. The alloys also posses very high tensile elongation values, excellent weldability and resistance to thermal and mechanical shock. The alloys are comprised, by weight, of from about 28% to about 34% Ni, from about 22% to about 26% Cr, from about 3.3% to about 4.4% Mo, from about 2% to about 3% W, from about 1% to about 3% Cu, from about 0.2% to about 0.9% Si, from about 0.3% to about 1.3% Mn, up to about 0.05%, but preferably not more than about 0.03% C, and the balance essentially iron, plus the usual impurities encountered in conventional production practice. The alloys may optionally contain up to about 0.3% Nb, up to about 0.20% Ti, and up to about 0.25% each of Al and V. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to austenitic corrosion resistant alloys suitable for casting from simple, small shapes up through large, complex, rangy shapes but capable of being wrought or forged.
The major components of the alloys of the invention are:
______________________________________
NICKEL 28-34% by weight
CHROMIUM 22-26%
MOLYBDENUM 3.
3-4.
4%
TUNGSTEN 2-3%
COPPER 1-3%
SILICON 0.
2-0.
9%
MANGANESE 0.
3-1.
3%
IRON essentially balance
______________________________________
The alloys of the invention will also contain carbon, up to a maximum of about 0.
05 by weight, but preferably only up to about 0.
03% maximum by weight.
The alloys of the invention may further contain, by weight, up to about 0.
25% each of Al and V, up to about 0.
2% Ti, up to about 0.
3% Cb and the usual impurities encountered in normal production of such alloys, including small amounts of cobalt, as encountered in certain nickel ore deposits and considered a part of the nickel content.
The alloys of the invention may further contain small amounts of nitrogen as encountered in ordinary melting and pouring but do not have nitrogen intentionally added.
The following examples further illustrate the invention.
EXAMPLE 1 One hundred pound heats of several different alloys were prepared in accordance with the invention.
Each of the heats were air-melted in a 100-pound high frequency induction furnace.
The composition of these alloys is set forth in Table I, with the balance in each instance being essentially iron.
TABLE I
______________________________________
ALLOY COMPOSITION-
% BY WEIGHT ALLOYING ELEMENTS
ALLOY
NUMBER Ni Cr Mo W Cu Mn Si C
______________________________________
1497 32.
97 22.
54 3.
50 2.
01 2.
96 0.
56 0.
60 0.
006
1509 32.
58 24.
02 3.
51 2.
52 2.
01 0.
63 0.
46 0.
013
1516 28
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Manufacturing Materials 
