US2014030133A1PendingUtilityA1
Cast iron containing niobium and component
Est. expiryApr 15, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Lutz DekkerGuido GüntherStefan JanssenSusanne LangeAlfred ScholzShilun ShengBabette TonnMark VierbaumStefan Wanjura
C22C 33/08F01D 5/28C22C 37/04C22C 37/10C22C 37/06F01D 25/24
31
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Claims
Abstract
Known cast iron alloys have use limits in respect of the temperature. An alloy (in a weight percentage) including silicon 2.0%-4.5%, carbon 2.9%-4.0%, niobium 0.05%-0.7%, molybdenum 0.3%-1.5%, optionally cobalt 0.1%-2.0%, manganese≦0.3%, nickel≦0.5%, magnesium≦0.07%, phosphorus≦0.05%, sulphur≦0.012%, chromium≦0.1%, antimony≦0.004%, and, iron, is provided.
Claims
exact text as granted — not AI-modified1 - 18 . (canceled)
19 . An iron-based alloy comprising (in % by weight):
silicon
2.0%-4.5%;
carbon
2.9%-4.0%; and
molybdenum
0.3%-1.5%;
20 . The alloy as claimed in claim 19 , further comprising:
cobalt
0.1%-2.0%,
manganese
≦0.3%,
nickel
≦0.5%,
magnesium
≦0.07%,
phosphorus
≦0.05%,
sulfur
≦0.012%,
chromium
≦0.1%,
antimony
≦0.004%, and
iron,
wherein, for carbon, silicon and phosphorus, has a CE equivalent of 4.1% to 4.4%, and
wherein
CE
=
%
by
weight
C
+
%
by
weight
Si
+
%
by
weight
P
3
holds true.
21 . The alloy as claimed in claim 19 , further comprising 0.1% by weight-0.2% by weight niobium.
22 . The alloy as claimed in claim 19 , further comprising 0.4% by weight-0.6% by weight niobium.
23 . The alloy as claimed in claim 20 , wherein the alloy does not comprise cobalt.
24 . The alloy as claimed in claim 20 , wherein the alloy comprises 0.4% by weight to 0.6% by weight cobalt.
25 . The alloy as claimed in claim 20 , wherein the alloy comprises 0.9% by weight to 1.0% by weight cobalt.
26 . The alloy as claimed in claim 20 , wherein the alloy comprises 1% by weight to 2% by weight cobalt.
27 . The alloy as claimed in claim 20 , wherein the alloy comprises 0.1% by weight cobalt.
28 . The alloy as claimed in claim 21 , wherein a proportion of silicon, cobalt, molybdenum and niobium is less than 6.5% by weight of the alloy.
29 . The alloy as claimed in claim 21 , wherein a proportion of molybdenum and niobium does not exceed 1.5% by weight of the alloy.
30 . The alloy as claimed in claim 19 , wherein the alloy comprises 2.0% by weight-3.0% by weight silicon.
31 . The alloy as claimed in claim 19 , wherein the alloy comprises 3.0% by weight-4.5% by weight silicon.
32 . The alloy as claimed in claim 19 , wherein the alloy contains no nickel except as a possible impurity.
33 . The alloy as claimed in claim 20 , wherein the alloy comprises at least 0.01% by weight nickel.
34 . The alloy as claimed in claim 19 , wherein the alloy comprises 2.5% by weight to 3.7% by weight carbon.
35 . The alloy as claimed in claim 19 , wherein the alloy comprises no chromium except as a possible impurity.
36 . The alloy as claimed in claim 20 , wherein the alloy comprises at least 0.01% by weight chromium.
37 . A component, consisting of:
an alloy as claimed in claim 19 , wherein the alloy is a housing part of a steam turbine or of a gas turbine.Join the waitlist — get patent alerts
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