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HS6 – 5 – 2 – 5 indicates high-speed steel containing:


1. Mo = 6%, W = 5%, V = 2%, Co = 5%
2. W = 6%. Mo = 5%, V = 2%, Co = 5%
3. Mo = 6%, V = 5%, W = 2%, Co = 5%
4. Co = 6%, Mo = 5%, V = 2% , W = 5%

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Correct Answer - Option 2 : W = 6%. Mo = 5%, V = 2%, Co = 5%

Explanation:

High-speed steel:

  • These steels are used for cutting metals at a much higher cutting speed than other tool steels.
  • The high-speed steels have the valuable property of retaining their hardness even when heated to red hot.

High-speed steel is of the following types:

High-speed steel

Composition

Application

Molybdenum high-speed steel

W = 6%, Mo = 5%, V = 2%, Co = 5%

  • Drilling
  • Tapping operations

18-4-1 high-speed steel

W = 18%, Cr = 4%, V = 1%

  • Lathe
  • Planer and shaper tools
  • Milling cutters

Cobalt high-speed steel

W = 20%, Cr = 4%, V = 2%, Co = 12%

  • Reamers
  • Punches

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