Domestic steel mold: W6Mo5Cr4V2Co5
Standard: GB / T 9943-1988
● Features and Scope:
Tungsten-molybdenum high-speed steels generally contain cobalt, compared W6Mo5Cr4V2 improves red hardness and high temperature hardness, improved wear resistance, has good machinability, but lower strength and toughness, easy to oxidation and decarbonization, generally used gear cutters, milling tools and punches, head and other tools for cutting hard materials.
● Chemical Composition:
Carbon C: 0.80 ~ 0.90 (tolerance: ± 0.01)
Si Si: 0.20 ~ 0.45 (tolerance: ± 0.05)
Mn Mn: 0.15 ~ 0.40 (tolerance: +0.04)
Sulfur S: ≤0.030
Phosphorus P: ≤0.030
Chromium Cr: 3.75 ~ 4.50 (tolerance: ± 0.05)
Ni: to allow the residual content ≤0.30
Cu: to allow the residual content ≤0.25
Vanadium V: 1.75 ~ 2.25 (tolerance: ± 0.05)
Mo Mo: 4.50 ~ 5.50 (tolerance: Size ≤6, ± 0.05; dimension> 6, ± 0.10)
Tungsten W: 5.50 ~ 6.50 (tolerance: Size ≤10, ± 0.10; sizes> 10, ± 0.20)
Cobalt Co: 4.50 ~ 5.50 (tolerance: ± 0.15)
● Mechanical Properties:
Hardness: Delivery hardness :( other processing methods) ≤285HB; (annealing) ≤269HB. Sample heat treatment and quenching hardness: ≥64HRC
● Heat treatment and microstructure specifications:
Heat treatment specifications: quenching, 730 ~ 840 ℃ preheating, 1190 ~ 1210 ℃ (salt bath) or 1200 ~ 1220 ℃ (box furnace) heating, oil cooler, 540 ~ 560 ℃ tempering two times, each time 2h.
● Delivery status: hot-rolled, forged, cold-drawn steel bars in the annealed condition delivery, hot-rolled, forged steel bars with after annealing + other processing methods (skinned, light pull, grinding or polishing, etc.) processing delivery .