Hongyuan SKH-55 [] [] SKH-55 steel Hongyuan Hongyuan] [SKH-55 tool steel] [Hongyuan Hitachi SKH-55] [Hongyuan SKH-55 pre-hardened material SKH-55] [Hongyuan Clinker SKH-55] [Hongyuan Hongyuan] Price [SKH-55 heat treatment material SKH-55] [Hongyuan hard materials] [Hongyuan Hongyuan SKH-55 steel [] SKH-55 rod chemical composition Grade: SKH -55-speed steel (chemical composition% :) carbon C: 0.80 ~ 0.90 (tolerance: ± 0.01) silicon 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 ≤0.30 copper Cu: ≤0.25 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) 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 to 2.20 for steel characteristics steel SKH-55 General Purpose: suitable manufacturing powerful cutting wear and senior Heng die, screw die, more complex required toughness and shape tools, milling cutters, drill bits and other factory condition and hardness (surface): HB900-1100 / HRC63