Steel material having excellent atmospheric corrosion resistance

Abstract

A steel material has excellent atmospheric corrosion resistance and a composition which contains more than 0.06% and less than 0.14% C, 0.05% or more and 2.00% or less Si, 0.20% or more and 2.00% or less Mn, 0.005% or more and 0.030% or less P, 0.0001% or more and 0.0200% or less S, 0.001% or more and 0.100% or less Al, 0.10% or more and 1.00% or less Cu, 0.10% or more and 0.65% or less Ni, 0.0001% or more and 1.000% or less Mo, preferably 0.005% or more and 1.000% or less Mo, 0.005% or more and 0.200% or less Nb, and Fe and unavoidable impurities as a balance.

1 . A steel material having a the composition which contains, by mass %, more than 0.06% and less than 0.14% C, 0.05% or more and 2.00% or less Si, 0.20% or more and 2.00% or less Mn, 0.005% or more and 0.030% or less P, 0.0001% or more and 0.0200% or less S, 0.001% or more and 0.100% or less Al, 0.10% or more and 1.00% or less Cu, 0.10% or more and 0.65% or less Ni, 0.001% or more and 1.000% or less Mo, 0.005% or more and 0.200% or less Nb, and Fe and unavoidable impurities as a balance. 
     
     
         2 . The steel material according to  claim 1 , further containing, by mass %, 0.005% or more and 1.000% or less Mo. 
     
     
         3 . The steel material according to  claim 1 , further containing one, two or more kinds selected from the group consisting of, by mass %, 0.2% or more and 1.0% or less Cr, 0.01% or more and 1.00% or less Co, 0.0001% or more and 0.1000% or less REM and 0.005% or more and 0.200% or less Sn. 
     
     
         4 . The steel material according to  claim 1 , further containing one, two or more kinds selected from the group consisting of, by mass %, 0.005% or more and 0.200% or less Ti, 0.005% or more and 0.200% or less V, 0.005% or more and 0.200% or less Zr, 0.0001% or more and 0.0050% or less B and 0.0001% or more and 0.0100% or less Mg. 
     
     
         5 . The steel material according to  claim 2 , further containing one, two or more kinds selected from the group consisting of, by mass %, 0.2% or more and 1.0% or less Cr, 0.01% or more and 1.00% or less Co, 0.0001% or more and 0.1000% or less REM and 0.005% or more and 0.200% or less Sn. 
     
     
         6 . The steel material according to  claim 2 , further containing one, two or more kinds selected from the group consisting of, by mass %, 0.005% or more and 0.200% or less Ti, 0.005% or more and 0.200% or less V, 0.005% or more and 0.200% or less Zr, 0.0001% or more and 0.0050% or less B and 0.0001% or more and 0.0100% or less Mg. 
     
     
         7 . The steel material according to  claim 3 , further containing one, two or more kinds selected from the group consisting of, by mass %, 0.005% or more and 0.200% or less Ti, 0.005% or more and 0.200% or less V, 0.005% or more and 0.200% or less Zr, 0.0001% or more and 0.0050% or less B and 0.0001% or more and 0.0100% or less Mg.