Low-alloy high-hardness wear-resistant steel plate and manufacturing method therefor

摘要

a low-alloy high-hardness wear-resistant steel plate having the following chemical composition (wt %): C: 0.33-0.45%; Si: 0.10-0.50%; Mn: 0.50-1.50%; B: 0.0005-0.0040%; Cr≤1.50%; Mo≤0.80%; Ni≤2.00%; Nb≤0.080%; V≤0.080%; Ti≤0.060%; RE≤0.10%; W≤1.00%; Al: 0.010%-0.080%; Ca: 0.0010-0.0080%; N≤0.0080%; O≤0.0080%; H≤0.0004%; P≤0.015%; and S≤0.010%, such that 0.20%≤(Cr/5+Mn/6+50B)≤0.50%; 0.02%≤(Mo/3+Ni/5+2Nb)≤0.50%; 0.01%≤(Al+Ti)≤0.13%, and the balance is Fe and unavoidable purities. The above chemical composition and thermal processing are used to obtain a steel plate that has a high degree of hardness and outstanding wear resistance and that is thereby suitable for use in all manner of machine parts susceptible to wear and tear.