US4248629A — Nickel- and chromium-base alloys possessing very-…

Claim 1

Independent Claim 114 words

A nickel-chromium alloy having high mechanical properties, high weldability, high creep strength and resistance to oxidation, and high resistance to carburization, consisting essentially of the following elements in weight percent: ______________________________________ carbon 0.05 to 0.60 nickel 20 to 55 chromium 15 to 40 silicon 0.5 to 2 manganese 0.5 to 2 nitrogen 0.03 to 0.20 niobium 0 to 2 tungsten and/or molybdenum 0 to 5 aluminium 2 to 8 copper 0 to 5 iron the balance, ______________________________________ said alloy being capable of acquiring increased resistance to carburization as a result of the formation, during service or by appropriate treatment prior to being put into the service, of a barrier opposing the penetration of carbon.

Claim 2

Dependent Claim 114 words

A nickel-chromium alloy having high mechanical properties, high weldability, high creep strength and resistance to oxidation, and high resistance to carburization, consisting essentially of the following elements in weight percent: ______________________________________ carbon 0.05 to 0.60 nickel 20 to 55 chromium 15 to 40 silicon 0.5 to 2 manganese 0.5 to 2 nitrogen 0.03 to 0.20 niobium 0 to 2 tungsten and/or molybdenum 0 to 5 aluminium 2 to 8 copper 0 to 5 iron the balance, ______________________________________ said alloy being capable of acquiring increased resistance to carburization as a result of the formation, during service or by appropriate treatment prior to being put into the service, of a barrier opposing the penetration of carbon.

Claim 3

Dependent Claim 62 words

An alloy according to claim 1, consisting essentially of the following elements in weight percent: ______________________________________ carbon 0.05 to 0.60 nickel 30 to 55 chromium 20 to 40 silicon 0.5 to 2 manganese 0.5 to 2 nitrogen 0.05 to 0.20 niobium 1 to 2 tungsten and/or molybdenum 0.2 to 5 aluminium 2 to 8 copper 0 to 5 iron the balance, ______________________________________

Claim 4

Dependent Claim 14 words

An alloy according to claim 2 containing 2.5 to 6.5% by weight of aluminium.

Claim 5

Dependent Claim 62 words

An alloy according to claim 2 consisting essentially of the following by weight composition: ______________________________________ carbon 0.10 to 0.50% nickel 35 to 50% chromium 20 t0 35% silicon 0.5 to 2% manganese 0.5 to 2% nitrogen 0.05 to 0.20% niobium 1 to 2% tungsten and/or molybdenum 0.5 to 3.5% aluminium 2.50 to 6.50% copper 0 to 3% iron 0 to 40% ______________________________________

Claim 6

Dependent Claim 23 words

An alloy according to claim 4 containing about 45% by weight nickel, about 25% by weight chromium and about 4% by weight aluminium.

Claim 7

Dependent Claim 23 words

An alloy according to claim 4 containing about 40% by weight nickel, about 20% by weight chromium and about 6% by weight aluminium.

Claim 8

Dependent Claim 33 words

An alloy according to claim 1 containing by weight: ______________________________________ nickel 20 to 35% chromium 15 to 25% nitrogen 0.03 to 0.10% niobium 0 to 1% tungsten and/or molybdenum 0 to 0.2% ______________________________________

Claim 9

Dependent Claim 13 words

An alloy according to claim 1 containing 20 to 30% by weight nickel.

Claim 10

Dependent Claim 13 words

An alloy according to claim 1 containing 15 to 20% by weight chromium.

Claim 11

Dependent Claim 13 words

An alloy according to claim 1 containing 0 to 1% by weight niobium.

Claim 12

Dependent Claim 13 words

An alloy according to claim 1 containing 0 to 0.2% by weight molybdenum.

Claim 13

Dependent Claim 60 words

Articles fabricated from an alloy consisting essentially of the following by weight composition: ______________________________________ carbon 0.05 to 0.60% nickel 20 to 55% chromium 15 to 40% silicon 0.5 to 2% manganese 0.5 to 2% nitrogen 0.03 to 0.20% niobium 0 to 2% tungsten and/or molybdenum 0 to 5% aluminium 2 to 8% copper 0 to 5% iron the balance. ______________________________________

Claim 14

Dependent Claim 60 words

Articles fabricated from an alloy consisting essentially of the following by weight composition: ______________________________________ carbon 0.05 to 0.60% nickel 20 to 55% chromium 15 to 40% silicon 0.5 to 2% manganese 0.5 to 2% nitrogen 0.03 to 0.20% niobium 0 to 2% tungsten and/or molybdenum 0 to 5% aluminium 2 to 8% copper 0 to 5% iron the balance. ______________________________________

Claim 15

Independent Claim 100 words

A method of obtaining articles possessing high resistance to carburization comprising fabricating said articles in their final shape from an alloy consisting essentially of the following by weight composition: ______________________________________ carbon 0.05 to 0.60% nickel 20 to 55% chromium 15 to 40% silicon 0.5 to 2% manganese 0.5 to 2% nitrogen 0.03 to 0.20% niobium 0 to 2% tungsten and/or molybdenum 0 to 5% aluminum 2 to 8% copper 0 to 5% iron the balance ______________________________________ and then in subjecting said articles to a treatment for accelerated endogenous formation of a barrier to the penetration of carbon into said articles.

Claim 16

Independent Claim 100 words

A method of obtaining articles possessing high resistance to carburization comprising fabricating said articles in their final shape from an alloy consisting essentially of the following by weight composition: ______________________________________ carbon 0.05 to 0.60% nickel 20 to 55% chromium 15 to 40% silicon 0.5 to 2% manganese 0.5 to 2% nitrogen 0.03 to 0.20% niobium 0 to 2% tungsten and/or molybdenum 0 to 5% aluminum 2 to 8% copper 0 to 5% iron the balance ______________________________________ and then in subjecting said articles to a treatment for accelerated endogenous formation of a barrier to the penetration of carbon into said articles.

Claim 17

Dependent Claim 17 words

A method according to claim 13 wherein said treatment comprises heating said articles in an oxidizing atmosphere.

Claim 18

Dependent Claim 16 words

An alloy according to claim 3 wherein the aluminium content is 3.5% to 6% by weight.

Claim 19

Dependent Claim 93 words

Articles made in their final form from an alloy consisting essentially of the following elements in weight percent: ______________________________________ carbon 0.05 to 0.60 [%] nickel 20 to 55 [%] chromium 15 to 40 [%] silicon 0.5 to 2 [%] manganese 0.5 to 2 [%] nitrogen 0.05 to 0.20 niobium 0 to 2 tungsten and/or molybdenum 0 to 5 aluminum 2 to 8 copper 0 to 5 iron the balance, ______________________________________ said articles having been subjected to a treatment for accelerated endogenous formation of a barrier to the penetration of carbon into said articles.

Claim 20

Dependent Claim 93 words

Articles made in their final form from an alloy consisting essentially of the following elements in weight percent: ______________________________________ carbon 0.05 to 0.60 [%] nickel 20 to 55 [%] chromium 15 to 40 [%] silicon 0.5 to 2 [%] manganese 0.5 to 2 [%] nitrogen 0.05 to 0.20 niobium 0 to 2 tungsten and/or molybdenum 0 to 5 aluminum 2 to 8 copper 0 to 5 iron the balance, ______________________________________ said articles having been subjected to a treatment for accelerated endogenous formation of a barrier to the penetration of carbon into said articles.

Claim 21

Dependent Claim 16 words

Articles according to claim 16 wherein said treatment comprised heating said articles in an oxidizing atmosphere.

Claim 22

Dependent Claim 18 words

An alloy according to claim 2 wherein the tungsten and/or molybdenum content is 1 to 3 weight percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-02-03	1984-08-04	1985-02-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-02-03	1988-08-04	1989-02-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-02-03	1992-08-04	1993-02-03	$7700.00	Window Closed / Lapsed

Nickel- and chromium-base alloys possessing very-high resistance to carburization at very-high temperature

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