Product

China T8 Mold steel

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China T8 Mold steel is a tungsten-cobalt-vanadium high-speed tool steel.Tool steels are high quality steels developed with controlled chemical composition to form properties essential for working and shaping of other materials. They are normally delivered to the suppliers in the soft annealed condition, which makes it easy for the manufacturer to machine the material with cutting tool for different applications.

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Chemical composition

C Si Mn P S Cr Mo Ni Cu V
0.75-0.85 0.2-0.4 0.2-0.4 0.03 0.03 3.75-4.5 0.4-1 0.3 0.25 1.80-2.40

Equivalent Grades of Steel

USA Germany Japan France England China Sweden Inter
UNS DIN JIS NF BS GB SS ISO
T72301 C80W2

(1.1625)

SK85

SK75

C80E2U 060A78

060A81

 

T8

 

1778 TC80

Mechanical properties of Steel

  • Tensile strength:1158 MPa
  • Elongation: 15%
  • Modulus of elasticity: 190-210 GPa
  • Poisson’s ratio: 0.27-0.3

Application

  • Drills
  • Planer tools
  • Cutoff tools
  • Roll-turning tools
  • Lathe tools

Heat Treatment Conditions

  • Critical point temperature: Ac1=730℃, Ar1=700℃, Ms=240℃
  • Normalizing specification: normalizing temperature 800-820℃, hardness 241-302HBW
  • Ordinary annealing specifications: 740-750℃×2-4h, cooling rate <30℃/h, slow cooling to 500-600℃ with the furnace, air cooling.
  • Isothermal spheroidizing annealing specifications: 740-750℃×2-4h, cooled to 650-680℃×4-6h, furnace cooled to 500-600℃, air cooling, hardness ≤187HBW. 750-770℃×1-2h, cooled to 680-700℃×2-3h, furnace cooled to 500-600℃, air-cooled, hardness 163-187HBW, pearlite structure grade 1-5.
  • Quenching + high temperature tempering spheroidization specifications: quenching temperature (800±10)℃, holding for 0.5h, water cooling, tempering temperature (700±10)℃, holding for 2h, furnace cooling to 550℃, air cooling, hardness 196-229HBW
  • Quenching and tempering specifications: quenching temperature 770-790℃, water cooling or oil cooling, hardness ≥62HRC, tempering temperature 170-190℃.

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