Question

The main alloying elements in high speed steel in order of increasing proportion are

1.

Vanadium, chromium, tungsten

2.

Tungsten, titanium, vanadium 

3.

Chromium, titanium, vanadium

4. Tungsten, chromium, titanium

Answer 1

Correct Answer - Option 1 :

Vanadium, chromium, tungsten

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 percent tungsten, 4 percent chromium, and 1 percent vanadium.
• So, in high speed steel in order of increasing proportion are Vanadium, Chromium, Tungsten