US2008069717A1PendingUtilityA1

High A1 stainless steel sheet and double layered sheet, process for their fabrication, honeycomb bodies employing them and process for their production

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Assignee: NIPPON STEEL CORPPriority: Nov 20, 2002Filed: Oct 31, 2007Published: Mar 20, 2008
Est. expiryNov 20, 2022(expired)· nominal 20-yr term from priority
Inventors:Tooru InagumaShogo KonyaHiroaki SakamotoMotonori Tamura
C22C 38/04C22C 38/28C22C 38/26C22C 38/06C22C 38/02
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Claims

Abstract

The present invention provides an Fe—Cr—Al based stainless steel sheet and double layered sheet having a high Al content of greater than 6.5%, honeycomb bodies employing the stainless steel sheet or double layered sheet, and a process for fabrication of the steel sheet or double layered sheet. The sheet is a high Al-containing Fe—Cr—Al based stainless steel sheet or high Al-containing double layered sheet characterized by comprising, by weight, Cr: 10-30% and Al: >6.5%-15%. Preferably, the steel sheet further comprises either or both Ti: 0.02-0.1% and Nb: 0.02-0.3%, and also comprises La: 0.01-0.1%, Ce: 0.01-0.1% and P: 0.01-0.05%. It also preferably comprises Cu: 0.01-1.0% by weight, and preferably further comprises Mg: 0.001-0.1% by weight. There is also provided a honeycomb body fabricated using the Fe—Cr—Al based stainless steel sheet.

Claims

exact text as granted — not AI-modified
1 - 20 . (canceled)  
     
     
         21 : A high Al-containing Fe—Cr—Al based stainless steel sheet, 
 characterized by comprising, by weight, Cr: 10-30% and Al: >6.5-15%, remainder Fe and unavoidable impurities, and    characterized in that the thickness t of said steel sheet is 10-40 μm, the thermal expansion coefficient α from 20° C. to 1000° C. is 15-23 μm/m/° C. and the 0.2% proof strength σ (N/mm 2 ) measured at 900° C., the steel sheet thickness t (μm) and the thermal expansion coefficient α (μm/m/° C.) are in a relationship satisfying the following inequality <1>, and the steel sheet is used in an exhaust gas purification catalyst-carrying honeycomb body,      σ≧(−9.0875×α 2 +4.2913×10 2 ×α−3.84215×10 3 )/ t   <1>.    
     
     
         22 : A high Al-containing Fe—Cr—Al based stainless steel sheet according to  claim 21 , characterized in that said steel sheet further comprises, by weight, Si: 0.1-1.0% and Mn: ≦0.5%.  
     
     
         23 : A high Al-containing Fe—Cr—Al based stainless steel sheet according to  claim 21 , characterized in that said steel sheet further comprises, by weight, either or both Ti: 0.02-0.1% and Nb: 0.02-0.3%, as well as La: 0.01-0.1%, Ce: 0.01-0.1% and P: 0.01-0.05%.  
     
     
         24 - 42 . (canceled)

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