US2026062777A1PendingUtilityA1
Alloy composition
Est. expiryAug 29, 2044(~18.1 yrs left)· nominal 20-yr term from priority
C22C 38/50C22C 38/06C22C 38/44C22C 38/02C22C 38/04C22C 38/001C22C 38/005C22C 38/48C22C 38/002C22C 30/00C22C 19/055
42
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Claims
Abstract
The present invention relates to alloy compositions. The alloy compositions disclosed herein can be used to prepare components (e.g. pipes) for high temperature chemical engineering applications. Particular examples of high temperature chemical engineering applications are steam cracker furnaces, direct reduction of iron (DRI) furnaces and steam methane reformers. Components of these furnaces need to be able to withstand internal pressure at elevated temperatures for extended periods of time.
Claims
exact text as granted — not AI-modified1 . An alloy composition comprising:
from 0.30 wt. % to 0.55 wt. % carbon, from 42 wt. % to 52 wt. % nickel, from 23 wt. % to 28 wt. % chromium, from 3.2 wt. % to 4.5 wt. % aluminium, from 1.1 wt. % to 1.6 wt. % tungsten, from 0.79 wt. % to 1.05 wt. % niobium, from 0.1 wt. % to 0.15 wt. % molybdenum, from 0.08 wt. % to 0.25 wt. % titanium, from 0.001 wt. % to 0.10 wt. % zirconium, up to 0.003 wt. % rare earth metal, up to 0.003 wt. % tantalum, up to 0.6 wt. % silicon, up to 0.6 wt. % manganese, up to 0.08 wt. % nitrogen, and up to 0.01 wt. % oxygen,
with the balance of the composition being iron and incidental impurities.
2 . The alloy composition of claim 1 , wherein the amount of carbon is from 0.32 wt. % to 0.47 wt. %.
3 . The alloy composition of claim 1 , wherein the amount of carbon is from 0.43 wt. % to 0.55 wt. %.
4 . The alloy composition of claim 1 , wherein the amount of carbon is from 0.30 wt. % to 0.39 wt. %.
5 . The alloy composition of claim 1 , wherein the amount of aluminium is from 3.2 wt. % to 3.9 wt. %.
6 . The alloy composition of claim 1 , wherein the amount of chromium is from 23.9 wt. % to 26.2 wt. %.
7 . The alloy composition of claim 1 , wherein the amount of nickel is from 43.9 wt. % to 49.9 wt. %.
8 . The alloy composition of claim 1 , wherein the amount of niobium is from 0.79 wt. % to 0.92 wt. %.
9 . The alloy composition of claim 1 , wherein the amount of tungsten is from 1.23 wt. % to 1.42 wt. %.
10 . The alloy composition of claim 1 , wherein the amount of titanium is from 0.1 wt. % to 0.25 wt %.
11 . The alloy composition of claim 1 , wherein the amount of zirconium is from 0.004 wt. % to 0.022 wt %.
12 . The alloy composition of claim 1 , wherein the amount of molybdenum is from 0.12 wt. % to 0.14 wt. %.
13 . The alloy composition of claim 1 , wherein the rare earth metal is Y, and wherein Y is present in an amount of at least 0.0001 wt. % and up to 0.003 wt. %.
14 . The alloy composition of claim 1 , wherein the amount of silicon is from 0.35 wt. % to 0.55 wt. %.
15 . The alloy composition of claim 1 , wherein the amount of manganese is from 0.4 wt. % to 0.6 wt. %.
16 . (canceled)
17 . A steel tube made from an alloy composition according to claim 1 .
18 . A use of an alloy composition according to claim 1 , or a steel tube according to claim 17 , in high temperature chemical reactors.
19 . The alloy composition of claim 1 , wherein the alloy composition satisfies the following parameters:
a
=
0.1
×
C
+
0.1
×
Cr
+
20
×
Nb
+
0.5
×
W
+
Ti
-
6
×
Mo
b
=
20
×
W
-
(
40
×
Ta
+
60
×
Re
)
c
=
N
i
A
l
wherein the presence of an element's symbol represents the wt. % of that element in the alloy composition; and the following conditions is met:
a
<
b
53
<
3
a
<
70
10
<
c
<
1
3
.
5
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