Haynes International, Inc.

Other

Haynes International, Imc.

Michael F Rothman

Dwaine L Klarstrom

George Y Lai

Lee Pike

Lee M Pike, Jr

Hani M Tawancy

Lee M Pike

A two step heat treatment for Ni&mdash;Cr&mdash;Mo alloys containing from 12% to 23.5% chromium provides higher yield strength, high tensile strength and other mechanical properties comparable to those observed in similar alloys age-hardened according to current practices. This treatment is done over a total time of not more than 50 hours. However, the treatment works for only those alloys having alloying elements present in amounts according to an equation here disclosed.

Two step aging treatment for Ni-Cr-Mo alloys

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A corrosion resistant metal alloy having improved formability and workability is disclosed which alloy contains in weight percent about 25% to 45% nickel, about 12% to 32% chromium, of at least one of 0.1% to 2.0% columbium, 0.2% to 4.0% tantalum, and 0.05% to 1.0% vanadium, up to about 0.20% carbon, about 0.05% to 0.50% nitrogen, about 0.001% to 0.02% boron and the balance being iron plus impurities and wherein the carbon and nitrogen content are controlled so that the amount of free carbon and nitrogen defined as ##EQU1## is greater than 0.14% and less than 0.29%. The alloy may also include in limited amounts one of aluminum, titanium, silicon, manganese, cobalt, molybdenum, tungsten, zirconium, yttrium, cerium and other rare earth metals.

Nitrogen strengthened FE-NI-CR alloy

A corrosion resistant metal alloy having improved formability and workability is disclosed which alloy contains in weight percent about 25% to 45% nickel, about 12% to 32% chromium, of at least one of 0.1% to 2.0% columbium, 0.2% to 4.0% tantalum, and 0.05% to 1.0% vanadium, up to about 0.20% carbon, about 0.05% to 0.50% nitrogen and the balance being iron plus impurities and wherein the carbon and nitrogen content are controlled so that the amount of free carbon and nitrogen defined as ##EQU1## is greater than 0.14% and less than 0.29%. The alloy may also include in limited amounts one of aluminum, titanium, silicon, manganese, cobalt, molydenum, tungsten, boron, zirconium, yttrium, cerium and other rare earth metals.

Nitrogen strengthened Fe-Ni-Cr alloy

Disclosed is a nickel-base alloy having a low coefficient of thermal expansion and a high degree of corrosion and oxidation resistance for use without a coating. The high strength alloy is not notch sensitive under impact and has very short term ordering to A.sub.2 B structure in aging. The alloy nominally contains, in weight percent, 8 chromium, 25 molybdenum, about 0.003 boron, about 1 iron, about 0.5 manganese, about 0.4 silicon and the balance nickel plus normal impurities.

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Kokomo, IN, United States of America

Michael F Rothman