US2024117471A1PendingUtilityA1
Fe-cr-ni-al high nickel content refractory austenitic steel
Est. expirySep 30, 2042(~16.2 yrs left)· nominal 20-yr term from priority
C22C 19/053C22C 19/058C21D 2211/001
42
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Claims
Abstract
A refractory austenitic alloy suitable for use at temperatures greater than or equal to 1100° C., comprises the following elements in percent by weight: chromium between 25.0% and 32.0%, nickel between 50.0% and 61.0%, aluminum between 1.0% and 6.0%, niobium between 0.15% and 1.50%, carbon between 0.05 and 0.60%, one or more reactive elements in a total content of 0.060% or less, silicon at 0.30% or less, manganese at 0.30% or less, titanium at 0.40% or less, nitrogen at 0.20% or less, vanadium at 1.0% or less, iron between 4.0% and 18.0%, for balancing the elements of the alloy, zirconium, tungsten and sulfur being absent from the alloy, or in the form of impurities. The alloy also satisfies two criteria connecting the percentages by weight of at least some of the elements of the alloy.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A refractory austenitic alloy, comprising the following elements in percentage by weight:
chromium between 25.0% and 32.0%, nickel between 50.0% and 61.0%, aluminum between 1.0% and 6.0%, niobium between 0.15% and 1.50%, carbon between 0.05% and 0.60%, one or more reactive elements in a total content of between 0.010% and 0.060%, a reactive element being defined as one of rare earth or hafnium, silicon at 0.30% or less, manganese at 0.30% or less, titanium at 0.40% or less, nitrogen between 0.015% and 0.20%, vanadium between 0.005% and 1.0%, iron between 4.0% and 18.0%, to balance the alloy elements, zirconium, tungsten and sulfur being absent from the alloy, or in the form of impurities, respectively, at less than 0.030% zirconium, less than 0.010% tungsten, and less than 0.0060% sulfur, the alloy further satisfying a first criterion and a second criterion connecting the percentages by weight (x Cr , x Al , x C , x Si , x Mn , x Ti , x Nb , x N , x V , x S , x Ni ) of at least some of the elements of the alloy; the first criterion defined by:
(
1
-
K
A
l
-
K
S
)
×
[
2
e
(
26
-
x
Cr
0
.
2
6
)
+
1
]
+
K
A
l
×
[
2
e
(
2
-
x
Al
0.4
)
+
1
]
+
K
S
×
[
2
e
(
x
S
-
0.003
0
.
1
×
x
S
)
+
1
]
≥
1
with
K
A
l
=
0.1728
+
0
.
1
2
9
3
×
ln
(
x
A
l
)
and
K
S
=
0
.
3
0
8
9
×
e
(
6
4
x
S
)
;
and the second criterion defined by:
−17.64+19.61 x Al −1.29 x Al 2 −101.46 x N +450.65 x N 2 −5.8368 x N 3 +9.68 x V +43.12 x Ti +30.02 x Si +11.42 x Ni −0.18 x Ni 2 +35.05 x Nb +47.92 x Cr −0.34 x Cr 2 +13.97 x Mn −239.66 x C ≥1070.
2 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of vanadium is greater than or equal to 0.010%.
3 . The refractory austenitic alloy of claim 2 , wherein the percentage by weight of vanadium is greater than or equal to 0.10%.
4 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of aluminum is greater than or equal to 2.0%.
5 . The refractory austenitic alloy of claim 4 , wherein the percentage by weight of aluminum is greater than or equal to 2.50%.
6 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of sulfur is less than 0.0050%.
7 . The refractory austenitic alloy of claim 6 , wherein the percentage by weight of sulfur is less than 0.0020%.
8 . The refractory austenitic alloy of claim 7 , wherein the percentage by weight of sulfur is less than 0.00050%.
9 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of nitrogen is greater than or equal to 0.060%.
10 . The refractory austenitic alloy of claim 9 , wherein the percentage by weight of nitrogen is greater than or equal to 0.10%.
11 . The refractory austenitic alloy of claim 10 , wherein the percentage by weight of nitrogen is greater than or equal to 0.12%.
12 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of chromium is between 26% and 31%.
13 . The refractory austenitic alloy of claim 1 , wherein the percentage by weight of carbon is greater than or equal to 0.16%.
14 . The refractory austenitic alloy of claim 13 , wherein the percentage by weight of carbon is greater than or equal to 0.25%.
15 . The refractory austenitic alloy of claim 14 , wherein the percentage by weight of carbon is greater than or equal to 0.35%.
16 . The refractory austenitic alloy of claim 1 , wherein the total percentage by weight of reactive elements is greater than or equal to 0.020%.
17 . The refractory austenitic alloy of claim 2 , wherein the percentage by weight of aluminum is greater than or equal to 2.0%.
18 . The refractory austenitic alloy of claim 17 , wherein the percentage by weight of sulfur is less than 0.0050%.
19 . The refractory austenitic alloy of claim 18 , wherein the percentage by weight of nitrogen is greater than or equal to 0.060%.
20 . The refractory austenitic alloy of claim 19 , wherein the percentage by weight of chromium is between 26% and 31%.Join the waitlist — get patent alerts
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