Cast iron containing niobium and component
Abstract
An alloy is provided. The alloy comprises (in % by weight): silicon 2.0%-4.5%, in particular 2.3%-3.9%, carbon 2.9%-4.0%, in particular 3.2%-3.7%, niobium 0.05%-0.7%, in particular 0.05%-0.6%, molybdenum 0.3%-1.5%, in particular 0.4%-1.0%, and optionally cobalt 0.1%-2.0%, in particular 0.1%-1.0%, manganese ≦0.3%, in particular 0.15-0.30%, nickel ≦0.5%, in particular ≦0.3%, magnesium ≦0.07%, in particular at least 0.03%, phosphorus ≦0.05%, in particular 0.02%-0.035%, sulfur ≦0.012%, in particular ≦0.005%, chromium ≦0.1%, in particular ≦0.05%, antimony ≦0.004%, in particular ≦0.003%, and iron.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . An iron-based alloy comprising (in % by weight):
silicon
2.0%-4.5%;
carbon
2.9%-4.0%;
niobium
0.05%-0.7%; and
molybdenum
0.5%-1.0%;
2 . The iron-based alloy as claimed in claim 1 , 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.
3 . The alloy as claimed in claim 1 , wherein the alloy comprises 0.05% by −0.2% by weight niobium.
4 . The alloy as claimed in claim 1 , wherein the alloy comprises 0.4% by −0.6% by weight niobium.
5 . The alloy as claimed in claim 1 , wherein the alloy comprises 0.4% to 0.6% by weight cobalt.
6 . The alloy as claimed in claim 1 , wherein the alloy comprises 0.9% to 1.1% by weight cobalt.
7 . The alloy as claimed in claim 1 , wherein the proportion of silicon, cobalt, molybdenum, and niobium is less than 6.5% by weight of the alloy.
8 . The alloy as claimed in claim 1 , wherein the proportion of molybdenum and niobium does not exceed 1.5% by weight of the alloy.
9 . The alloy as claimed in claim 1 , wherein the alloy comprises 2.0%-3.0% by weight silicon.
10 . The alloy as claimed in claim 1 , wherein the alloy comprises 3.0%-4.5% by weight silicon.
11 . The alloy as claimed in claim 1 , wherein the alloy comprises 3.15%-3.40% by weight silicon.
12 . The alloy as claimed in claim 1 , wherein the alloy comprises 3.9%-4.1% by weight silicon.
13 . The alloy as claimed in claim 1 , wherein the alloy comprises no nickel and no chromium except as a possible impurity.
14 . The alloy as claimed in claim 1 , wherein the alloy comprises at least 0.01% by weight nickel.
15 . The alloy as claimed in claim 1 , wherein the alloy comprises 3.2% to 3.4% by weight carbon.
16 . The alloy as claimed in claim 1 , wherein the alloy comprises 3.4% to 3.7% by weight carbon.
17 . The alloy as claimed in claim 1 , wherein for carbon, silicon and phosphorus, the alloy 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.
18 . A component, consisting of:
an alloy as claimed in claim 1 , 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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