Grade: SKH55 high-speed steel (chemical composition%:)
Carbon C: 0.80 ~ 0.90 (tolerance: ± 0.01)
Si Si: 0.20 ~ 0.45 (tolerance: ± 0.05)
Manganese Mn: 0.15 ~ 0.40 (tolerance: +0.04)
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr: 3.80 ~ 4.40 (tolerance: ± 0.05)
Ni: to allow the residual content of ≤ 0.30
Copper Cu: to allow the residual content of ≤ 0.25
Vanadium V: 1.75 ~ 2.20 (tolerance: ± 0.05)
Mo Mo: 4.50 ~ 5.50 (tolerance: size ≤ 6, ± 0.05; size> 6, ± 0.10)
Tungsten W: 5.50 ~ 6.75 (tolerance: size ≤ 10, ± 0.10; size> 10, ± 0.20)
Note: According to the agreement between, V content of 1.60 ~ 2.20 for
Steel properties
SKH55 steel general purpose: cutting wear appropriate to create a strong, senior Heng mold, the screw mode, the more complex needs toughness and shape tools, milling cutters, drills and other factory condition and hardness (surface): HB900-1100/HRC63
