Wear-resistant steel

A wear-resistant steel containing, in mass%, 0.08-0.20% of C, 0.01-0.50% of Si, 0.10-2.00% of Mn, and 2.10-8.00% of Cr, the amount of carbides contained in the metallographic structure being 0.5% by area% or less, the average circle-equivalent diameter of the carbides being 500 nm or less, the average particle diameter of the first 10 crystal grains in the order from the large particle diameter among the crystal grains surrounded by a large inclination angle grain boundary of 15 DEG or more being 40 [mu] m or less, and the average particle diameter of the second 10 crystal grains in the order from the large particle diameter. The Charpy absorption energy at-40 DEG C is 27 J or more, and the surface hardness is 360 Hv or more and 634 * [C] 1/2 + 140 HV10 or more. 一种耐磨钢，其以质量％计含有C：0.08～0.20％、Si：0.01～0.50％、Mn：0.10～2.00％、Cr：2.10～8.00％，金属组织中所含的碳化物以面积％计为0.5％以下，碳化物的平均当量圆直径为500nm以下，由15°以上的大倾角晶界所围成的晶粒中的按照从粒径大的顺序起前10个晶粒的平均粒径为40μm以下，-40℃下的夏比吸收能为27J以上，表面硬度为360Hv以上并且为634×[C]1/2+140HV10以上。