Engineering Board Exam Reviewer · Engineering Materials · medium

High-speed tool steels retain their hardness at high temperatures mainly due to alloying with:

1. Tungsten, molybdenum, chromium and vanadium
2. Copper and zinc
3. Lead and tin
4. Aluminum and silicon

Answer

A. Tungsten, molybdenum, chromium and vanadium

Solution

These form stable carbides (red hardness).

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