US2025236941A1PendingUtilityA1
Method for producing a component from the semi-finished product of a nickel-chromium-aluminum alloy
Est. expiryMar 10, 2042(~15.7 yrs left)· nominal 20-yr term from priority
C22C 19/055C21D 9/50C22F 1/10C22C 19/058C22C 19/053
56
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Claims
Abstract
A method produces a component, partially or entirely formed from a semi-finished product of a nickel-chromium-aluminum alloy, with (in wt. %)>18 to 33% chromium, 1.8-4.0% aluminum, 0.01-7.0% iron, 0.001-0.50% silicon, 0.001-2.0% manganese, 0.00-0.60% titanium, respectively 0.0-0.05% magnesium and/or calcium, 0.005-0.12% carbon, 0.0005-0.050% nitrogen, 0.0001-0.020% oxygen, 0.001-0.030% phosphorus, max. 0.010% sulfur, max. 2.0% molybdenum, max. 2.0% tungsten, remainder ≥50% nickel and impurities. The component contains weld seams of the same type and/or the component is partially or entirely provided with such weld seams for installation in a system. After welding, only the weld seams of the same type and heat-affected zones undergo annealing between >980 and 1250° C. for 0.05 minutes-24 hours, then cooling in inert protective atmosphere, moving protective gas or air, where: Cr+Al≥28; and Fp≤39.9, with Fp=Cr+0.272*Fe+2.36*Al+2.22*Si+2.48*Ti+0.374*Mo+0.538*W−11.8*C, Cr, Fe, Al, Si, Ti, Mo, W and C being element wt. % concentrations.
Claims
exact text as granted — not AI-modified1 . A method for the manufacture of a component, produced partly or entirely from a semifinished product of a nickel-chromium-aluminum alloy, containing (in mass-%) more than 18 to 33% chromium, 1.8 to 4.0% aluminum, 0.01 to 7.0% iron, 0.001 to 0.50% silicon, 0.001 to 2.0% manganese, 0.00 to 0.60% titanium, respectively 0.0 to 0.05% magnesium and/or calcium, 0.005 to 0.12% carbon, 0.0005 to 0.050% nitrogen, 0.0001-0.020% oxygen, 0.001 to 0.030% phosphorus, max. 0.010% sulfur, max. 2.0% molybdenum, max. 2.0% tungsten, the rest nickel, greater than or equal to 50% and the common process-related impurities, wherein the component contains welded seams of similar type and/or the component is provided partly or completely with welded seams of similar type for installation in a plant, wherein, after welding, only the welded seams of similar type and the heat-affected zones are subjected, for homogenization of the welded seams and/or for reduction of stresses, to an annealing between 98° and 1250° C. for times of 0.05 minutes to 24 hours, followed by a cooling in stationary shield gas or air, moving (blown) shield gas or air, with the consequence that the creep strength and the creep ductility of the welded seams are improved by this annealing,
wherein the following relationships must be satisfied:
Cr
+
Al
≥
28
(
1
a
)
and
Fp
≤
39.9
with
(
2
a
)
Fp
=
Cr
+
0.272
*
Fe
+
2.36
*
Al
+
2.22
*
Si
+
2.48
*
Ti
+
0.374
*
Mo
+
0.538
*
W
-
11.8
*
C
(
3
a
)
wherein Cr, Fe, Al, Si, Ti, Mo, W and C are the concentrations of the elements in question in mass-%.
2 . The method according to claim 1 , wherein the component contains welded seams of similar type and, after the welding, the entire component containing the welded seams is subjected, for homogenization of the welded seam and/or for reduction of stresses, to an annealing between higher than 980 and 1250° C. for times from 0.05 minutes up to 24 hours, followed by a cooling in stationary shield gas or air, moving (blown) shield gas or air or in water, with the consequence that the creep strength and the creep ductility of the welded seams are improved by this annealing.
3 . The method according to claim 1 , wherein, after a process of grinding of the welded seam and of the heat-affected zone, it is advantageous when roughness values Ra of 0.01 to 15 μm are attained, since this improves the corrosion resistance and especially the “metal dusting” resistance and raises them almost to the value of the parent material of the component.
4 . The method according to claim 1 , wherein the semifinished product has a grain size of 30 to 600 μm.
5 . The method according to claim 1 , with a chromium content of 20 to 33%.
6 . The method according to claim 1 , with an aluminum content of 1.8 to 3.2%.
7 . The method according to claim 1 , with an iron content of 0.01 to 4.0%.
8 . The method according to claim 1 , if necessary with an additional content of niobium of 0.0 to 1.1%, wherein the formula (3a) is supplemented by a term for Nb:
Fp
=
Cr
+
0.272
*
Fe
+
2.36
*
Al
+
2.22
*
Si
+
2.48
*
Ti
+
1.26
*
Nb
+
0.374
*
Mo
+
0.538
*
W
-
11.8
*
C
(
3
b
)
and Cr, Fe, Al, Si, Ti, Nb, Mo, W and C are the concentrations of the elements in question in mass-%.
9 . The method according to claim 1 , optionally with a content of zirconium of 0.0 to 0.20%.
10 . The method according to claim 1 , optionally with an yttrium content of 0.001 to 0.20%.
11 . The method according to claim 1 , optionally with a lanthanum content of 0.001 to 0.20%.
12 . The method according to claim 1 , optionally with a cerium content of 0.001 to 0.20%.
13 . The method according to claim 1 , optionally with a content of cerium mixed metal of 0.001 to 0.20%.
14 . The method according to claim 1 , optionally with a content of hafnium of 0.001 to 0.20%.
15 . The method according to claim 1 , optionally with a content of tantalum of 0.001 to 0.60%.
16 . The method according to claim 1 , optionally with a content of boron of 0.0001 to 0.008%.
17 . The method according to claim 1 , optionally further containing 0.0 to 5.0% cobalt.
18 . The method according to claim 1 , optionally further containing at most 0.5% copper, wherein the formula (4a) is supplemented by a term for Cu:
Fp
=
Cr
+
0.272
*
Fe
+
2.36
*
Al
+
2.22
*
Si
+
2.48
*
Ti
+
0.477
*
Cu
+
0.374
*
Mo
+
0.538
*
W
-
11.8
*
C
(
3
c
)
and Cr, Fe, Al, Si, Ti, Cu, Mo, W and C are the concentrations of the elements in question in mass-%.
19 . The method according to claim 1 , optionally further containing at most 0.5% vanadium.
20 . The method according to claim 1 , wherein the impurities are adjusted to contents of max. 0.002% Pb, max. 0.002% Zn, max. 0.002% Sn.
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