US4121953A — High strength, austenitic, non-magnetic alloy

Claim 1

Independent Claim 124 words

Parts for use in electrical generators, said parts having been subjected to a high degree of work hardening in the solution-treated condition, said parts being substantially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being composed of an alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 17-23 Chromium >6-<9 Carbon up to 0.8 Silicon up to 1.5 Nitrogen up to 0.8 Nickel up to 2.75 Molybdenum up to 3.5 Vanadium up to 1.7 Columbium up to 0.45 Iron Balance, ______________________________________ the manganese plus chromium being greater than 24 and less than 31.5 and the carbon plus nitrogen being between 0.35 and 0.8.

Claim 2

Dependent Claim 124 words

Parts for use in electrical generators, said parts having been subjected to a high degree of work hardening in the solution-treated condition, said parts being substantially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being composed of an alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 17-23 Chromium >6-<9 Carbon up to 0.8 Silicon up to 1.5 Nitrogen up to 0.8 Nickel up to 2.75 Molybdenum up to 3.5 Vanadium up to 1.7 Columbium up to 0.45 Iron Balance, ______________________________________ the manganese plus chromium being greater than 24 and less than 31.5 and the carbon plus nitrogen being between 0.35 and 0.8.

Claim 3

Dependent Claim 27 words

An electrical generator having high strength, non-magnetic structural parts resistant to stress-corrosion cracking and hydrogen embrittlement, the said parts being composed of the alloy of claim 1.

Claim 4

Dependent Claim 86 words

The parts of claim 1 wherein the alloy includes a small but effective quantity of one or more of the elements nickel, molybdenum, vanadium and columbium is included, the nickel being added to maintain a stable austenite in view of the limitation on the quantity of carbon and nitrogen, the molybdenum being added to reduce susceptibility to stress-corrosion cracking in slowly-quenched alloys, the vanadium being added to increase work-hardening rate and to improve stress-corrosion-cracking resistance, the columbian being added to increase the hardness of the alloy.

Claim 5

Dependent Claim 37 words

The parts of claim 1 wherein the alloy includes one or more of the following elements in weight percent: ______________________________________ Nickel 0.2 to 2.75 Molybdenum 0.6 to 3.5 Vanadium 0.6 to 1.7 Columbium 0.1 to 0.4. ______________________________________

Claim 6

Dependent Claim 45 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Nickel 0.4 to 1 Iron Balance. --. ______________________________________

Claim 7

Dependent Claim 44 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Molybdenum 0.6 to 1 Iron Balance. ______________________________________

Claim 8

Dependent Claim 48 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Nickel 0.4 to 1 Molybdenum 0.6 to 1 Iron Balance. ______________________________________

Claim 9

Dependent Claim 49 words

The parts of claim 1 composed essentially of a wrought steel alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Molybdenum 1 to 2 Vanadium 0.7 to 1.25 Iron Balance. ______________________________________

Claim 10

Dependent Claim 52 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following composition in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Nickel 0.4 to 1 Molybdenum 1 to 2 Vanadium 0.7 to 1.25 Iron Balance. ______________________________________

Claim 11

Dependent Claim 48 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 18 to 22 Chromium 6.5 to 9 Carbon 0.45 to 0.65 Silicon 0.2 to 1 Nitrogen 0.05 to 0.15 Columbium 0.1 to 0.4 Iron Balance. ______________________________________

Claim 12

Dependent Claim 89 words

Parts for use in electrical generators, said parts having been subjected to a high degree of cold work hardening in this solution-treated condition, said parts being essentially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having a high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being comprised of a ferrous alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 19 Chromium 6 Nickel 0.5 Molybdenum 1.5 Carbon 0.5 Silicon 0.4 Vanadium 0.75 to 1.25 Iron Balance. ______________________________________

Claim 13

Dependent Claim 89 words

Parts for use in electrical generators, said parts having been subjected to a high degree of cold work hardening in this solution-treated condition, said parts being essentially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having a high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being comprised of a ferrous alloy consisting essentially of the following compositions in weight percent: ______________________________________ Manganese 19 Chromium 6 Nickel 0.5 Molybdenum 1.5 Carbon 0.5 Silicon 0.4 Vanadium 0.75 to 1.25 Iron Balance. ______________________________________

Claim 14

Dependent Claim 52 words

The parts of claim 1 composed of a wrought steel alloy consisting essentially of the following composition in weight percent: ______________________________________ Manganese 18 to 20 Chromium 7.5 to 9 Carbon 0.35 to 0.6 Silicon 0.3 to 0.6 Nickel 0.4 to 1 Molybdenum 2.75 to 3.25 Vanadium 0.6 to 1.0 Iron Balance. ______________________________________

Claim 15

Dependent Claim 39 words

The parts of claim 1 composed of the alloy of claim 1 including by weight percent: 0.1 to 0.7 nitrogen and 0.0 to 0.6 carbon and wherein the carbon plus the nitrogen is between 0.35 and 0.7 weight percent.

Claim 16

Dependent Claim 53 words

The part of claim 1 composed of the alloy of claim 1 having a vanadium content by weight percent of between 0.6 and 1.7, the said parts having been cold worked and thereafter aged in the cold worked condition at a temperature between 900° F and 1200° F to increase the strength thereof.

Claim 17

Dependent Claim 46 words

The part of claim 1 composed of a wrought steel part of the alloy of claim 1 which after being subjected to a temperature in which its component elements are dissolved, has been abruptly quenching from solution temperatures and thereafter cold worked to a high-strength level.

Claim 18

Dependent Claim 17 words

The part of claim 1 composed of an alloy whose chromium content is between 6.5% and 9%.

Claim 19

Dependent Claim 86 words

Parts for use in electrical generators, said parts having been subjected to a high degree of cold-work hardening in the solution-treated condition, said parts being essentially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having a high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being comprised of a ferrous alloy consisting essentially of the following composition in weight percent: ______________________________________ Manganese 19 Chromium 6 Silicon 0.4 Carbon 0.2 Nitrogen and Carbon 0.35 to 0.7 Iron Balance. ______________________________________

Claim 20

Dependent Claim 86 words

Parts for use in electrical generators, said parts having been subjected to a high degree of cold-work hardening in the solution-treated condition, said parts being essentially austenitic and non-ferromagnetic, both as quenched during said solution treatment and after cold working, and having a high resistance to stress-corrosion cracking and hydrogen embrittlement, said parts being comprised of a ferrous alloy consisting essentially of the following composition in weight percent: ______________________________________ Manganese 19 Chromium 6 Silicon 0.4 Carbon 0.2 Nitrogen and Carbon 0.35 to 0.7 Iron Balance. ______________________________________

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-10-23	1982-04-24	1982-10-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-10-23	1986-04-24	1986-10-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-10-23	1990-04-24	1990-10-24	$7700.00	Window Closed / Lapsed

High strength, austenitic, non-magnetic alloy

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