High-hardness low-alloy wear-resistant steel sheet and method of manufacturing the same

A wear-resistant steel sheet consisting of:

• a) greater than 0.33% to less than or equal to 0.37 wt % carbon (C):
• b) 0.33-0.50 wt % silicon (Si);
• c) 0.95-1.50 wt % manganese (Mn);
• d) 0.0005-0.0040 wt % boron (B);
• e) less than or equal to 1.50 wt % chromium (Cr);
• f) 0.17-0.80 wt % molybdenum (Mo);
• g) 0.31-2.00 wt % nickel (Ni);
• h) greater than 0% to less than or equal to 0.080 wt % niobium (Nb);
• i) greater than 0% to less than or equal to 0.080 wt % vanadium (V);
• j) less than or equal to 0.060 wt % titanium (Ti);
• k) less than or equal to 0.10 wt % rare earth (RE);
• l) greater than 0% to less than or equal to 1.00 wt % tungsten (W);
• m) 0.010-0.080 wt % aluminum (Al);
• n) 0.0010-0.0080 wt % calcium (Ca);
• o) less than or equal to 0.0080 wt % nitrogen (N);
• p) less than or equal to 0.0080 wt % oxygen (O);
• q) less than or equal to 0.0004 wt % hydrogen (H);
• r) less than or equal to 0.015 wt % phosphorus (P);
• s) less than or equal to 0.010 wt % sulfur (S);
• t) 0.20-0.50 wt % (Cr/5+Mn/6+50B)
• u) 0.02-0.50 wt % (Mo/3+Ni/5+2Nb)
• v) 0.01-0.13 wt%(Al+Ti)
• w) a remainder of iron (Fe) and other unavoidable impurities;
• wherein the steel sheet comprises microstructures of martensite and retained austenite, a hardness of equal to or more than 575 HB, and a Charpy V-notch longitudinal impact energy of equal to or more than 65 J as measured at −40° C.