Origin, brand: Japan's Hitachi

The profile: SKH-9high speed steel W MO system (6-5-2) high speed tool steel is the most common, especially SKH9( SKH51) in the world is the amount of many, instead of on the W type high speed tool steel SKH2carbide microstructure, neat, distribution of good. And even organization. So the wear resistance and the leather aspect more balanced. Especially as the only carbon content increases or decreases, so does not damage the high temperature characteristics, can be continuous and substantially alter the steel properties. Need of low carbon steel leather used on hardness, wear resistance, with conditions suitable for high carbon steel bell. Rich hot, cold plasticity, machinability and grinding is also good

Forging:1.100~ 900.

The annealing: heating to 800-850C, this temperature for two ~ four hours, in the furnace as it is cold.

The quenching: pre heating to 550-600C, heating to 950degrees C, and then heated to1250 DEG C A : 1220; B: 1200~ 1230. In oil quenching oil temperature, but must first moisturizing40-60C ( a. General tools; b. Forms of the complex type need toughness. )

The tempering: heating to 550-570C, this temperature residence, and in still air cooling, tempering must repeat two times

Hardness: HRC63DEG C.

The purpose : This is the tungsten high speed steel, is suitable for the manufacture of strong cutting wear, impact resistance of various tools, advanced die, a screw die, need more toughness and shape complex tools, milling cutter, drill bits

The chemical constituents of:

C:0.45:3.8-4.5:0.8-0.9silicon chromium molybdenum vanadium manganese:0.45:4.5-5.5:1.6-2.2:5.5-6.7:0.03tungsten phosphorus sulfur:0.01

The state and hardness ( surface ): HB900-1100/ HRC61-HRC63