9Cr18MoV good rust resistance, is currently used in high-end tool market quantities of high quality stainless steel, its strength and sharpness resistance even at ATS-34, the chromium content up to 16-18%, is the second most commonly used stainless steel (after ATS-34), it is the first to be accepted Cutlery stainless steel, and has been very popular, especially in the minus processes have been developed, such a process to enhance the toughness of the steel. Chemical composition Carbon C: 0.8 Si Si: ≤0.805 ~ 0.95 Chromium Cr: 17.00 ~ 19.00 Ni: to allow ≤0.60 containing molybdenum Mo: 1.00 ~ 1.30 Mechanical properties of hardness: annealing, ≤269HB; quenching and tempering, ≥58HRC heat treatment specifications: 1) annealing, 800 ~ 920 ℃ slow cooling; 2) quenching, 1050 ~ 1075 ℃ oil cooling; 3) tempering, 100 ~ 200 ℃ air cooling. Mainly used in stainless steel sections, mechanical cutting tools and cutting tools, surgical blades, high wear equipment parts.