Low-cost wear-resistant steel NM400 and production method thereof

The invention discloses low-cost wear-resistant steel NM400 and a production method thereof, and belongs to the technical field of metallurgy. The steel comprises the following chemical components in percentage by mass: 0.15 to 0.18 percent of C, 0.10 to 0.20 percent of Si, 1.20 to 1.30 percent of Mn, less than or equal to 0.009 percent of P, less than or equal to 0.003 percent of S, 0.35 to 0.45 percent of Cr, 0.010 to 0.020 percent of Ti, 0.015 to 0.025 percent of Nb, 0.030 to 0.040 percent of Als, 0.0010 to 0.0018 percent of B, less than or equal to 0.00012 percent of H, less than or equal to 0.0040 percent of N and the balance of Fe and inevitable trace impurities. The production method comprises the steps of steelmaking, controlled rolling and controlled cooling, quenching and tempering heat treatment. No Mo is added, a large amount of water and a high water ratio are adopted in the quenching cooling process, stacking heating and low-temperature tempering are adopted in the tempering process, and the obt