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18-4-1 High speed steel contains-

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18-4-1 High speed steel contains-
1. 4% carbon
2. 5% vanadium
3. 4% chromium
4. 0.7% tungsten
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Correct Answer - Option 3 : 4% chromium

Explanation:

  • High-speed steel is special alloy steel which is obtained by alloying tungsten, Chromium, Vanadium, Cobalt and molybdenum with steel
  • HSS is an alloy of 18% tungsten, 4% chromium and 2% Vanadium
  • Stellite is an alloy of 30% chromium, 20% tungsten and 1 to 4% carbon and the remaining consists of cobalt
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