Casting & Heat Treatment Process

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Quality Inspection

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Products & Use
Products Cr(%) Hardness(HRc) Industry Size(mm)
UR 26-29 >=60 Mining 15-90
ER 19-22 >=60 Mining / Cement 15-90
SR 15-18 >=58 Mining / Chemical / Silica / Cement 15-100
RDH 10-13 >=58 Mining / Chemical / Silica / Cement 15-90
RD 10-13 >=50 Mining / Chemical / Silica / Coal 30-100
D 1-3 >=48 Mining / Chemical / Silica / Cement / Aggregate 25-100
ST <1 >=55 Mining / Chemical / Silica / Cement / Aggregate 20-120

TOYO metal mold casting makes structure finer and more uniform which makes TOYO balls the best quality.

  1. TOYO Hi Chrome Balls are produced by Metal mold.
  2. Competitor’s high Cr. Balls are produced by sand mold.
  3. Metal mold cools down smelted metal faster than sand mold.
  4. The faster cooling speed makes structure finer and more uniform.
  5. This and TOYO special heart treatment technology makes TOYO Hi Chrome Balls the least wear and the best quality.

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Microscopic Structure

TOYO High Chrome Ball (90Φ)

  • Strong Surface
  • Strong Structure
  • Strong Core
  • Strong Ball

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Competitor’s high Cr Ball(90Φ)

  • Weak and Cosmetic Surface
  • Weak Structure
  • Weak Core
  • Weak Ball

* Black Area : Marten site base (Equiv.HRC60~66)
White Area : Eutectic Cr carbide (Cr,Fe)7C3(Equiv.HRC70~75)