Question

Correct sequence of elements of 18 - 4 - 1 HSS tool is
1. W, Cr, V
2. Mo, Cr, V
3. Cr, Ni, C
4. Cu, Zn, Sn

Answer 1

Correct Answer - Option 1 : W, Cr, V

Concept:

• High-speed steels are used for cutting metals at a much higher cutting speed than ordinary carbon tool steels.
• The high-speed steels have the valuable property of retaining their hardness even when heated to red heat.
• Most of the high-speed steels contain tungsten as the chief alloying element, but other elements like cobalt, chromium, vanadium, etc. may be present in some proportion.
• 18-4-1 High-speed steel- contains 18 per cent tungsten (W), 4 per cent chromium (Cr), 1 per cent vanadium (V), 0.7% carbon and rest iron.