Steel sheet having excellent wear resistance and composite corrosion resistance, and method of manufacturing same

Abstract

The present invention provides a steel sheet having excellent wear resistance and composite corrosion resistance, and a method of manufacturing same. According to one example of the present invention, a corrosion-resistant steel sheet having excellent wear resistance and composite corrosion resistance comprises, in wt %: 0.04-0.10% of carbon (C); 0.10% or less (excluding 0%) of silicon (Si); 0.20-0.35% of copper (Cu); 0.1-0.2% of nickel (Ni); 0.05-0.15% of antimony (Sb); 0.07-0.22% of tin (Sn); 0.05-0.15% of titanium (Ti); 0.01% or less (excluding 0%) of sulfur (S); 0.005% or less (excluding 0%) of nitrogen (N); 0.05-0.15% of molybdenum (Mo); and the balance of iron (Fe) and inevitable impurities, and satisfies formula 1 and formula 2 below.[Ni]/[Cu]≥0.5   [Formula 1]48×([Ti]/48−[S]/32−[N]/14)≥0.04   [Formula 2]Here, in formula 1 and formula 2, [Ni], [Cu], [Ti], [S], and [N] represent Ni, Cu, Ti, S, and N content (wt %) in the steel sheet, respectively.

1 . A corrosion-resistant steel sheet comprising, by weight: 0.04 to 0.10% of carbon (C), 0.10% or less (excluding 0%) of silicon (Si), 0.20 to 0.35% of copper (Cu), 0.1 to 0.2% of nickel (Ni), 0.05 to 0.15% of antimony (Sb), 0.07 to 0.22% of tin (Sn), 0.05 to 0.15% of titanium (Ti), 0.01% or less (excluding 0%) of sulfur (S), 0.005% or less (excluding 0%) of nitrogen (N), and 0.05 to 0.15% of molybdenum (Mo), with a balance of iron (Fe) and inevitable impurities,
 the corrosion-resistant steel sheet satisfying the following Formulae 1 and 2:
   [Ni]/[Cu]≥0.5   [Formula 1]
 
   48×([Ti]/48−[S]/32−[N]/14)≥0.04   [Formula 2]
 
   wherein [Ni], [Cu], [Ti], [S], and [N] represent contents (wt %) of Ni, Cu, Ti, S, and N in the steel sheet, respectively.   
     
     
         2 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 the corrosion-resistant steel sheet includes a TiC precipitate, and   the TiC precipitate and an aggregate formed of the TiC precipitate are included at 10 16  or more per 1 cm 3 .   
     
     
         3 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 the TiC precipitate has a particle diameter of 1 to 10 nm.   
     
     
         4 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 the corrosion-resistant steel sheet satisfies the following Formula 3.
   10×[Mo]+12×[Sn]+22×[Sb]+50×[Cu]≥16   [Formula 3]
 
   wherein [Mo], [Sn], [Sb], and [Cu] represent contents (wt %) of Mo, Sn, Sb, and Cu in the steel sheet, respectively.   
     
     
         5 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is immersed in a mixed solution of 28.5 wt % of a sulfuric acid solution and 0.5 wt % of a hydrochloric acid solution at 40 to 80° C., a concentrated layer is produced on a surface of the steel sheet.   
     
     
         6 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is immersed in 50 wt % of a sulfuric acid solution at 50 to 90° C., a concentrated layer is produced on a surface of the steel sheet.   
     
     
         7 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 the concentrated layer includes Mo, Cu, Sb, and Sn.   
     
     
         8 . The corrosion-resistant steel sheet of  claim 7 , wherein:
 the concentrated layer has a concentrated amount of 10 wt % or more,   wherein the concentrated amount refers to a sum of the contents (wt %) of concentrating elements Mo, Cu, Sb, and Sn, at a boundary point at which Fe and O have the same wt %.   
     
     
         9 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 the concentrated layer has a thickness of 10 nm or more.   
     
     
         10 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 a recrystallization fraction after subjecting the steel sheet to an annealing heat treatment is 80% or more.   
     
     
         11 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 when the steel sheet is immersed in the mixed solution of 28.5 wt % of the sulfuric acid solution and 0.5 wt % of the hydrochloric acid solution at 60° C. for 6 hours, a corrosion weight loss ratio is 0.8 mg/cm 2 /hr or less.   
     
     
         12 . The corrosion-resistant steel sheet of  claim 6 , wherein:
 when the steel sheet is immersed in 50 wt % of the sulfuric acid solution at 70° C. for 6 hours, a corrosion weight loss ratio is 37 mg/cm 2 /hr or less.   
     
     
         13 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 a product of the corrosion weight loss ratio when the steel sheet is immersed in 50 wt % of the sulfuric acid solution at 70° C. for 6 hours and the corrosion weight loss ratio when the steel sheet is immersed in the mixed solution of 28.5 wt % of the sulfuric acid solution and 0.5 wt % of the hydrochloric acid solution at 60° C. for 6 hours is 20 or less.   
     
     
         14 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is a hot rolled steel sheet, the hot rolled steel sheet has a tensile strength of 580 MPa or more and a surface hardness of 85 or more based on HRB.   
     
     
         15 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is a cold rolled steel sheet, the cold rolled steel sheet has a tensile strength of 540 MPa or more and a surface hardness of 80 or more based on HRB.   
     
     
         16 . A method of manufacturing a corrosion-resistant steel sheet, the method comprising:
 preparing a steel slab which includes, by weight: 0.04 to 0.10% of carbon (C), 0.10% or less (excluding 0%) of silicon (Si), 0.20 to 0.35% of copper (Cu), 0.1 to 0.2% of nickel (Ni), 0.05 to 0.15% of antimony (Sb), 0.07 to 0.22% of tin (Sn), 0.05 to 0.15% of titanium (Ti), 0.01% or less (excluding 0%) of sulfur (S), 0.005% or less (excluding 0%) of nitrogen (N), and 0.05 to 0.15% of molybdenum (Mo), with a balance of iron (Fe) and inevitable impurities, and   satisfies the following Formulae 1 and 2;   heating the slab at 1,200° C. or higher; and   hot rolling the heated slab at a finish rolling temperature of 850 to 1000° C. to manufacture a hot rolled steel sheet:
   [Ni]/[Cu]≥0.5   [Formula 1]
 
   48×([Ti]/48−[S]/32−[N]/14)≥0.04   [Formula 2]
 
   wherein [Ni], [Cu], [Ti], [S], and [N] represent contents (wt %) of Ni, Cu, Ti, S, and N in the steel sheet, respectively   
     
     
         17 . The method of manufacturing a corrosion-resistant steel sheet of  claim 16 , further comprising:
 after the manufacturing of a hot rolled steel sheet,   winding the hot rolled steel sheet at 450 to 750 ° C.;   cold rolling the wound hot rolled steel sheet at a reduction ratio of 54 to 70% to manufacture a cold rolled steel sheet; and   subjecting the cold rolled steel sheet to an annealing heat treatment at 750 to 880 ° C.   
     
     
         18 . The method of manufacturing a corrosion-resistant steel sheet of  claim 16 , wherein:
 in the heating of a slab at 1,200° C. or higher,   a residence time is 150 minutes or more.   
     
     
         19 . The corrosion-resistant steel sheet of  claim 6 , wherein:
 the concentrated layer has a thickness of 10 nm or more.   
     
     
         20 . The corrosion-resistant steel sheet of  claim 6 , wherein:
 a product of the corrosion weight loss ratio when the steel sheet is immersed in 50 wt % of the sulfuric acid solution at 70° C. for 6 hours and the corrosion weight loss ratio when the steel sheet is immersed in the mixed solution of 28.5 wt % of the sulfuric acid solution and 0.5 wt % of the hydrochloric acid solution at 60° C. for 6 hours is 20 or less.