Powder steel and preparation method thereof

The invention provides powder steel. The powder steel is prepared from components including 1.6wt%-2.0wt% of C, less than or equal to 0.60wt% of Si, less than or equal to 0.35wt% of Mn, 4.00wt%-5.20wt% of Cr, 3.50wt%-6.50wt% of Mo, 4.50wt%-8.00wt% of W, 4.00wt%-6.00wt% of V, 6.00wt%-9.00wt% of Co, less than or equal to 0.030wt% of P, less than or equal to 0.030wt% of S and the balance Fe. The powder steel contains C, Si, Mn, Cr, Mo, W, Co, V, P and S elements, W, Mo and V are strong carbide forming elements and mainly play roles in precipitation strengthening, and Co can improve the red hardness of the steel. The powder steel has the good performance under the combined action of the alloy elements and the content of the alloy elements. The invention further provides a preparation method ofthe powder steel. 本发明提供了一种粉末钢，成分为：1.6～2.0wt％的C；Si≤0.60wt％；Mn≤0.35wt％；4.00～5.20wt％的Cr；3.50～6.50wt％的Mo；4.50～8.00wt％的W；4.00～6.00wt％的V；6.00～9.00wt％的Co；P≤0.030wt％；S≤0.030wt％；余量为Fe。本发明提供的粉末钢含有的C、Si、Mn、Cr、Mo、W、Co、V、P、S元素，W、Mo和V是强碳化