question_answer

The compositions of some of the alloy steels are as under:

1. 18 W 4 Ct 1 V

2. 12 Mo I W 4 Cr IV

3. 6 Mo 6 W 4 Cr 1 V

4. 18 W 8 Cr IV

The compositions of commonly used high speed steels would in clude:

A) 1 and 2            

B) 2 and 3

C) 1 and 4            

D) 1 and 3