SKH-9 Japan's Hitachi Yasugi steel is cold YSS model containing tungsten tool steel, also known as YXM1 amounted to more than 5.5%, Japan's Hitachi SKH-9 special high-quality high-speed tool steel

 
Relatively standard and features: M2

 

     Chemical analysis results (%):

0.8 - 0.9 Carbon Silicon: 0.45 The following chromium :3.8-4 .5 Mn: 0.45 The following Mo 4.5-5.5 V :1.6-2.2 W :5.5-6.7 P: 0.03 S: 0.01

 
Steel properties: high-speed steel

 
Steel general purpose: cutting wear is appropriate manufacturing strength, high modulus Heng, screw mode, the more complex needs toughness and shape tools, milling cutters, drills, etc.

 
Factory state and hardness (surface): HB900-1100/HRC63

 
SKH-9 test theoretical calculation

Name (units) symbolic meaning of the formula calculation example
Round steel wire rod W = 0.006165 × d × dd = diameter mm 100 mm diameter round bar, find the weight per m. Weight per m = 0.006165 × 1002 = 61.65kg
(Kg / m)


 
SKH-9 forging technology and features: Forged: 1.100 ~ 900 ℃

 
Annealing: Heat to 800-850 ℃, remain at this temperature in two to four hours in the furnace allowed to cool gradually.

 
Quenching: the first pre-heated to 550-600 ℃, times heated to 950 ℃, and then heated to a: 1,220 ~ 1250 ℃; b:

 
1,200 ℃ ~ 1230 ℃. Hardened in oil,

 
But the oil temperature must be moisture 40-60 ℃ (a. general tools; b. form a complex type of tool needed toughness)

 
Tempering: heating to 550-570 ℃, to stay at this temperature and then cooled in still air, tempering must be repeated twice

 
Hardness: HRC63 or more.

 
Use: This high-speed steel, tungsten steel, appropriate for manufacturing powerful cutting wear resistance, impact tools, high-level die, screw mode,

 
Complicated than the required toughness and shape tools, milling cutters, drills, etc.