US2012183431A1PendingUtilityA1

Structural steel material and steel structure with high corrosion resistance

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Assignee: MIURA SHINICHIPriority: Sep 30, 2009Filed: Sep 28, 2010Published: Jul 19, 2012
Est. expirySep 30, 2029(~3.2 yrs left)· nominal 20-yr term from priority
Inventors:Shinichi MiuraIsamu KageMasatsugu MuraseToshiyuki Hoshino
C22C 38/002C22C 38/001C22C 38/16C22C 38/14C21D 6/005C21D 6/008C22C 38/08C22C 38/06C22C 38/12C22C 38/60C22C 38/02C22C 38/04C22C 38/008
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Claims

Abstract

A structural steel material contains C: 0.020% or more and less than 0.140%, Si: 0.05% or more and 2.00% or less, Mn: 0.20% or more and 2.00% or less, P: 0.005% or more and 0.030% or less, S: 0.0001% or more and 0.0200% or less, Al: 0.001% or more and 0.100% or less, Cu: 0.10% or more and 1.00% or less, Ni: 0.10% or more and less than 0.65%, and W: 0.05% or more and 1.00% or less, and one or both of Nb: 0.005% or more and 0.200% or less and Sn: 0.005% or more and 0.200% or less, the balance being iron and unavoidable impurities.

Claims

exact text as granted — not AI-modified
1 . A structural steel material comprising, in terms of mass %, C: 0.020% or more and less than 0.140%, Si: 0.05% or more and 2.00% or less, Mn: 0.20% or more and 2.00% or less, P: 0.005% or more and 0.030% or less, S: 0.0001% or more and 0.0200% or less, Al: 0.001% or more and 0.100% or less, Cu: 0.10% or more and 1.00% or less, Ni: 0.10% or more and less than 0.65%, W: 0.05% or more and 1.00% or less, and one or both of Nb: 0.005% or more and 0.200% or less and Sn: 0.005% or more and 0.200% or less, the balance being iron and unavoidable impurities. 
     
     
         2 . The structural steel material according to  claim 1 , comprising, in terms of mass %, Nb: 0.005% or more and 0.200% or less and Sn: 0.005% or more and 0.200% or less. 
     
     
         3 . The structural steel material according to  claim 1 , further comprising, in terms of mass %, Cr: more than 0.1% and 1.0% or less. 
     
     
         4 . The structural steel material according to  claim 1 , further comprising, in terms of mass %, at least one selected from the group consisting of Co: 0.01% or more and 1.00% or less, Mo: 0.005% or more and 1.000% or less, Sb: 0.005% or more and 0.200% or less, and REM: 0.0001% or more and 0.1000% or less. 
     
     
         5 . The structural steel material according to  claim 1 , further comprising, in terms of mass %, at least one selected from the group consisting of Ti: 0.005% or more and 0.200% or less, V: 0.005% or more and 0.200% less, Zr: 0.005% or more and 0.200% or less, B: 0.0001% or more and 0.0050% or less, and Mg: 0.0001% or more and 0.0100% or less. 
     
     
         6 . The structural steel material according to  claim 1 , wherein a weld cracking parameter Pcm defined by Formula (1) below is 0.25 mass % or less:
     Pcm =[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]  (1)
   
       where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], and [B] represent contents (mass %) of respective elements. 
     
     
         7 . A steel structure comprising the structural steel material according to  claim 1 . 
     
     
         8 . The structural steel material according to  claim 2 , further comprising, in terms of mass %, Cr: more than 0.1% and 1.0% or less. 
     
     
         9 . The structural steel material according to  claim 2 , further comprising, in terms of mass %, at least one selected from the group consisting of Co: 0.01% or more and 1.00% or less; Mo: 0.005% or more and 1.000% or less, Sb: 0.005% or more and 0.200% or less, and REM: 0.0001% or more and 0.1000% or less. 
     
     
         10 . The structural steel material according to  claim 3 , further, comprising, in terms of mass %, at least one selected from the group consisting of Co: 0.01% or more and 1.00% or less, Mo: 0.005% or more and 1.000% or less, Sb: 0.005% or more and 0.200% or less, and REM: 0.0001% or more and 0.1000% or less. 
     
     
         11 . The structural steel material according to  claim 2 , further comprising, in terms of mass %, at least one selected from the group consisting of Ti: 0.005% or more and 0.200% or less, V: 0.005% or more and 0.200% or less, Zr: 0.005% or more and 0.200% or less, B: 0.0001% or more and 0.0050% or less, and Mg: 0.0001% or more and 0.0100% or less. 
     
     
         12 . The structural steel material according to  claim 3 , further comprising, in terms of mass %, at least one selected from the group consisting of Ti: 0.005% or more and 0.200% or less, V: 0.005% or more and 0.200% or less, Zr: 0.005% or more and 0.200% or less, B: 0.0001% or more and 0.0050% or less, and Mg: 0.0001% or more and 0.0100% or less. 
     
     
         13 . The structural steel material according to  claim 4 , further comprising, in terms of mass %, at least one selected from the group consisting of Ti: 0.005% or more and 0.200% or less, V: 0.005% or more and 0.200% or less, Zr: 0.005% or more and 0.200% or less, B: 0.0001% or more and 0.0050% or less, and Mg: 0.0001% or more and 0.0100% or less. 
     
     
         14 . The structural steel material according to  claim 2 , wherein a weld cracking parameter Pcm defined by Formula (1) below is 0.25 mass % or less:
     Pcm =[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15[V]/10+5×[B]  (1)
   
       where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], and [B] represent contents (mass %) of respective elements. 
     
     
         15 . The structural steel material according to  claim 3 , wherein a weld cracking parameter Pcm defined by Formula (1) below is 0.25 mass % or less:
     Pcm =[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]  (1)
   
       where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], and [B] represent contents (mass %) of respective elements. 
     
     
         16 . The structural steel material according to  claim 4 , wherein a weld cracking parameter Pcm defined by Formula (1) below is 0.25 mass % or less:
     Pcm =[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[MO]/15+[V]/10+5×[B]  (1)
   
       where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], and [B] represent contents (mass %) of respective elements. 
     
     
         17 . The structural steel material according to  claim 5 , wherein a weld cracking parameter Pcm defined by Formula (1) below is 0.25 mass % or less:
     Pcm =[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]  (1)
   
       where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], and [B] represent contents (mass %) of respective elements. 
     
     
         18 . A steel structure comprising the structural steel material according to  claim 2 . 
     
     
         19 . A steel structure comprising the structural steel material according to  claim 3 . 
     
     
         20 . A steel structure comprising the structural steel material according to  claim 4 .

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