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The composition of some of the alloy steels are as under

1. 18W4Cr1V

2. 12M01W4Cr1V

3. 5M06W4Cr2V

4. 18W8Cr1V

The composition of commonly used high-speed steels would include


1. 1 and 2
2. 2 and 3
3. 1 and 4
4. 1 and 3

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Correct Answer - Option 4 : 1 and 3

Explanation:

  • 18-4-1 High Speed Steel- It contains 18% Tungsten, 4% Chromium, 1% Vanadium
  • Molybdenum High Speed Steel: 6% Molybdenum, 6% Tungsten, 4% Chromium, 2% Vanadium.

In ques., option no. 3 has 5Mo i.e., 5% Molybdenum but it is actually 6% Molybdenum.

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