SKH-9 
 Chemical composition: 
 C Si Mn Cr W of Mo the VP, V-S- 
 0.85 0.45 0.45 4.00 5.80 1.80 4.80 0.03 0.01 

 Forging: 1.100 ~ 900 ° C annealing: heating to 800-850 ° C, and stay at this temperature 
 Four hours in the oven, let it getting cold. Quenching: the first pre-heated to 550-600 ° C, heated to 950 ℃ 
 And then heated to a: 1,220 ~ 1250 ° C; b: 1 
 200 ℃ ~ 1230 ℃. Hardened in oil, but the oil temperature must 
 Moisture 40-60 ℃ (a. general tools; (b) the form of complex 
 Need toughness tools) Tempering: heating to 550-570 ° C, staying at this temperature, and then 
 In still air cooling, tempering must repeat the secondary hardness: HRC63 ℃ above. Uses: This high-speed steel, tungsten steel, it is appropriate to create a strong cutting wear. 
 Impact-resistant variety of tools, advanced die screw mode, representing a need tough 
 And shape of the complex tool, cutter, drill, and so on.