US2025066896A1PendingUtilityA1
Method for producing a component made of a nickel-chromium-aluminum alloy and provided with weld seams
Est. expiryMar 10, 2042(~15.6 yrs left)· nominal 20-yr term from priority
C22C 19/053C21D 9/50C22F 1/10C22C 19/058
56
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Claims
Abstract
In a method for producing, and/or installing into a system, a component with one or more weld seams containing 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 containing semi-finished products of wrought alloy, after welding, only the weld seams and surrounding heat-affected zones undergo annealing between greater than 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 with one or more welded seams and/or for installation of a component in a plant with one or more welded seams, which comprise 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 is partly or completely made up of semifinished products of this nickel-chromium-aluminum wrought alloy and, after the welding, only the welded seams of this nickel-chromium-aluminum wrought alloy and the heat-affected zones surrounding the welded seams 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
and
(
1
a
)
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 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 a further 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.
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.
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 a content of niobium of 0.0 to 1.1%, wherein the formula (4a) 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 , further optionally containing 0.0 to 5.0% cobalt.
18 : The method according to claim 1 , further optionally 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 , further optionally 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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