SKH55 
 Is an advanced tool steel cold model Hitachi SKH55 special high-quality high-speed tool steel chemical composition 
 Chemical composition 
 Grade: SKH55 high-speed steel (chemical composition%:) C 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) S S: ≤ 0.030 P P: ≤ 0.030 Chromium Cr: 3.80 ~ 4.40 (tolerance: ± 0.05) Ni: to allow the residual copper content of ≤ 0.30 Cu: ≤ 0.25 to allow the residual content of vanadium V: 1.75 ~ 2.20 (tolerance: ± 0.05) Mo Mo: 4.50 ~ 5.50 (tolerance: size ≤ 6, ± 0.05; size> 6, ± 0.10) W W: 5.50 ~ 6.75 (tolerance: size ≤ 10, ± 0.10; size> 10, ± 0.20) Note: According to the agreement between, V content can be 1.60 ~ 2.20 
 Steel properties 
 SKH55 steel general purpose: cutting wear appropriate to create powerful, high-heng mold, the screw mode, the more complicated to be resilient and shape tools, milling cutters, drills and other factory condition and hardness (surface): HB900-1100/HRC63 
 Features and applicability 
 Performance: high-carbon cobalt-molybdenum super-hard high-speed tool steel, high hardness, up to 63HRC, hot hardness, high temperature, high hardness, easy grinding. With the steel cutting tool cutting iron-based high temperature alloy, cast high-temperature alloys, titanium and ultra high strength steel, but the toughness is somewhat less quenching temperature should be lower. As the grinding performance can be good, it can be used to manufacture a variety of high precision and complex tools