US2019078183A1PendingUtilityA1

Ti-CONTAINING FERRITIC STAINLESS STEEL SHEET HAVING GOOD TOUGHNESS, AND FLANGE

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Assignee: NISSHIN STEEL CO LTDPriority: Mar 24, 2016Filed: Feb 7, 2017Published: Mar 14, 2019
Est. expiryMar 24, 2036(~9.7 yrs left)· nominal 20-yr term from priority
Inventors:Seiji MitsunagaYasuhiro Ehara
C22C 38/06C22C 38/02C22C 38/001C21D 6/00C22C 38/22C22C 38/32C22C 38/36C21D 8/0263C22C 38/28C22C 38/00C22C 38/04C21D 8/02C21D 9/46C22C 38/34C22C 38/18Y02P10/20
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Claims

Abstract

A Ti-containing ferritic stainless steel sheet having good toughness has a chemical composition containing, in terms of percentage by mass, from 0.003 to 0.030% of C, 2.0% or less of Si, 2.0% or less of Mn, 0.050% or less of P, 0.040% or less of S, from 10.0 to 19.0% of Cr, 0.030% or less of N, 4(C+N) or more and 0.80% or less of Ti, and from 0.010 to 0.20% of Al, furthermore one or more of 1.50% or less of Mo and 0.0030% or less of B if necessary, with the balance of Fe and unavoidable impurities, and has a content R (% by mass) of an extraction residue recovered by an electrolytic extraction method and contents of C and N in the steel that satisfy the following expression (1): R>5.0C+4.4N−0.025  (1).

Claims

exact text as granted — not AI-modified
1 . A Ti-containing ferritic stainless steel sheet having a chemical composition containing, in terms of percentage by mass, from 0.003 to 0.030% of C, 2.0% or less of Si, 2.0% or less of Mn, 0.050% or less of P, 0.040% or less of S, from 10.0 to 19.0% of Cr, 0.030% or less of N, 4(C+N) or more and 0.80% or less of Ti, and from 0.010 to 0.20% of Al, with the balance of Fe and unavoidable impurities, and having a content R (% by mass) of an extraction residue recovered by an electrolytic extraction method and contents of C and N in the steel that satisfy the following expression (1):
   R>5.0C+4.4N−0.025  (1)
   
       wherein in the lower limit of the Ti content and the expression (1), C and N represent the contents of C and N in the steel in terms of percentage by mass respectively. 
     
     
         2 . The Ti-containing ferritic stainless steel sheet according to  claim 1 , wherein in the chemical composition, the C content is from 0.007 to 0.030% by mass. 
     
     
         3 . The Ti-containing ferritic stainless steel sheet according to  claim 1 , wherein the Ti-containing ferritic stainless steel sheet has the chemical composition further containing, in terms of percentage by mass, 1.50% or less of Mo. 
     
     
         4 . The Ti-containing ferritic stainless steel sheet according to  claim 1 , wherein the Ti-containing ferritic stainless steel sheet has the chemical composition further containing, in terms of percentage by mass, 0.0050% or less of B. 
     
     
         5 . The Ti-containing ferritic stainless steel sheet according to  claim 1 , wherein the Ti-containing ferritic stainless steel sheet has a sheet thickness of from 5.0 to 11.0 mm. 
     
     
         6 . A flange using the Ti-containing ferritic stainless steel sheet according to  claim 1 . 
     
     
         7 . The flange according to  claim 6 , wherein the flange is a flange for an exhaust gas flow path. 
     
     
         8 . The flange according to  claim 6 , wherein the flange is a flange for an automobile exhaust gas flow path.

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