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Ferritic stainless steel for use in high temperature applications and method for producing a foil of the steel

A stainless steel, ferrite technology, applied in separation methods, chemical instruments and methods, layered products, etc., can solve problems such as high temperature fatigue strength increase

Inactive Publication Date: 2005-03-23
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The trend towards thinner thicknesses for metal catalytic converter steel foils creates several issues, one being the need for better oxidation performance as less aluminum is available per unit of surface area and the other being A material with increased high temperature fatigue strength will be required

Method used

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  • Ferritic stainless steel for use in high temperature applications and method for producing a foil of the steel
  • Ferritic stainless steel for use in high temperature applications and method for producing a foil of the steel
  • Ferritic stainless steel for use in high temperature applications and method for producing a foil of the steel

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Embodiment Construction

[0022] These objects of the invention are achieved by an alloy having the following composition (all contents in weight %):

[0023] C≤0.05

[0024] Cr 16.0-24.0%

[0025] Ni greater than 1.0-15.0%

[0026] Al 4.5-12.0%

[0027] Mo+W ≤4.0%

[0028] Mn≤1.0%

[0029] Si ≤2.0%

[0030] Zr+Hf ≤0.1%

[0031] REM≤0.1%

[0032] N≤0.05%

[0033] The rest is Fe and the usual steelmaking impurities and additives.

[0034] The Cr content should be limited to 16.0-24.0% by weight, preferably 20.0-22.0% by weight. The Ni content should be limited to greater than 1.0-15.0 wt%, preferably 2.5-15.0 wt%, most preferably 5.0-12.5 wt%. The aluminum content should be limited to 4.5-12.0% by weight, preferably 5.0-8.0% by weight, most preferably 5.0-7.0% by weight. The total content of Mo and W elements should be limited to a maximum of 4.0% by weight, preferably a maximum of 3.0% by weight. The Mn content...

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Abstract

The present invention relates to the use of a hot workable ferritic stainless steel alloy resistant to thermal cyclic stress and oxidation at elevated temperatures and having improved mechanical properties as substrate for exhaust gas purifying applications, such as catalytic converters or heating applications and having the following composition (in weight-%): C <=0,05%, Cr 16,0-24,0%, Ni more than 1,0-15,0%, Al 4,5-12,0%, Mo+W <=4,0%, Mn <=1,0%, Si <=2,0%, Zr+Hf <=0,1%, REM <=0,1%, N <=0,05% balance Fe and normally occurring steelmaking impurities and additions.

Description

[0001] The present invention relates to a thermally operable ferritic stainless steel alloy resistant to thermal cycling stress and oxidation at high temperatures and having improved mechanical properties for use as a substrate in exhaust gas purification applications such as catalytic converters and heating applications. Background of the Invention [0002] Ferritic Fe—Cr—Al alloy foils are used today as carrier material for catalytic converters for purifying exhaust gases from internal combustion engines. The greatest advantage of this alloy lies in the formation of a thin bonded aluminum oxide film on the surface which keeps the metal stable at the service temperature of the catalytic converter and under the cyclical thermal stresses which are common operating conditions in this application. Avoid rapid oxidation. In order to form such a protective oxide, it is speculated that a minimum aluminum content of 4.5% in the alloy is necessary. [0003] It is known to improve if ...

Claims

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Application Information

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IPC IPC(8): F01N3/10B01D53/86B32B15/01C22C38/00C22C38/06C22C38/44C22C38/50
CPCB32B15/012C22C38/06C22C38/44C22C38/005
Inventor 马格努斯·塞德格伦肯尼斯·戈兰松
Owner SANDVIK INTELLECTUAL PROPERTY AB
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