18-4-1 high speed steel contains 18%, 4% and 1% respectively of____________________?
Correct answer: B. Tungsten, chromium and vanadium
- A. Tungsten, vanadium and chromium
- B. Tungsten, chromium and vanadium
- C. Vanadium, chromium and tungsten
- D. Chromium, tungsten and vanadium
Explanation
The designation 18-4-1 for high-speed steel refers to approximately 18% tungsten, 4% chromium and 1% vanadium. Tungsten provides hot hardness, while chromium and vanadium improve hardenability and wear resistance.
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