Ferritic Stainless Steel
Abstract
Ferritic steel alloyed with a balanced quantity of chromium, aluminium and reactive elements and that has the following composition (in % by weight): Ni up to 1 Cr 15-25 Al 0.75-3.7 Si max 0.6 Mo and/or W 0-3 Ti and/or Nb 0-1 Cup to 0.2 N up to 0.2 one or more of the reactive elements Zr, Hf and REM>0 balance iron and normally occurring impurities, wherein the equation Cr+3AI≧26 is satisfied. The ferritic stainless steel is suitable for use as substrate material in catalytic converters for diesel engines in heavy vehicles at temperatures in the interval of 600-900° C. and a specific relation between the content of chromium and aluminium being satisfied.
Claims
exact text as granted — not AI-modified1 : Ferritic stainless steel alloy comprising (in % by weight):
Ni
up to 1
Cr
15-25
Al
0.75-3.7
Si
max 0.6
Mo and/or W
0-3
Ti and/or Nb
0-1
C
up to 0.2
N
up to 0.2
one or more of the reactive elements Zr, Hf and REM>0
balance iron and normally occurring impurities,
wherein the equation Cr+3Al≧26 is satisfied.
2 : Ferritic stainless steel alloy according to claim 1 , comprising Cr 17.0-23.0% by weight.
3 : Ferritic stainless steel alloy according to claim 1 , comprising Al 1.5-3.5% by weight.
4 : Ferritic stainless steel alloy according to claim 1 , comprising Zr and/or Hf>0-0.5% by weight.
5 : Ferritic stainless steel alloy according to claim 1 , comprising REM maximally 0.2% by weight.
6 : Substrate material in catalytic converters for diesel engines comprising the ferritic stainless steel alloy according to claim 1 .
7 : A catalytic converter for a diesel engine operating at 600-900° C., comprising a substrate formed from a ferritic stainless steel alloy comprising (in % by weight):
Ni
up to 1
Cr
15-25
Al
0.75-3.7
Si
max 0.6
Mo and/or W
0-3
Ti and/or Nb
0-1
C
up to 0.2
N
up to 0.2
one or more of the reactive elements Zr, Hf and REM>0
balance iron and normally occurring impurities,
wherein the equation Cr+3Al≧26 is satisfied.
8 . (canceled)
9 : Ferritic stainless steel alloy according to claim 2 , comprising Cr 20.0-23.0% by weight.
10 : Ferritic stainless steel alloy according to claim 3 , comprising Al 2.5-3.5% by weight.
11 : Ferritic stainless steel alloy according to claim 4 , comprising Zr and/or Hf>0-0.2% by weight.
12 : Ferritic stainless steel alloy according to claim 5 , comprising REM 0.01-0.2% by weight.
13 : Ferritic stainless steel alloy according to claim 1 , wherein Cr+3Al≧29.
14 : Ferritic stainless steel alloy according to claim 7 , comprising Cr 17.0-23.0% by weight.
15 : Ferritic stainless steel alloy according to claim 14 , comprising Cr 20.0-23.0% by weight.
16 : Ferritic stainless steel alloy according to claim 7 , comprising Al 1.5-3.5% by weight.
17 : Ferritic stainless steel alloy according to claim 16 , comprising Al 2.5-3.5% by weight.
18 : Ferritic stainless steel alloy according to claim 7 , comprising Zr and/or Hf>0-0.5% by weight.
19 : Ferritic stainless steel alloy according to claim 18 , comprising Zr and/or Hf>0-0.2% by weight.
20 : Ferritic stainless steel alloy according to claim 7 , comprising REM maximally 0.2% by weight.
21 : Ferritic stainless steel alloy according to claim 20 , comprising REM 0.01-0.2% by weight.
22 : Ferritic stainless steel alloy according to claim 7 , wherein Cr+3Al≧29.Join the waitlist — get patent alerts
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