Question

Percentages of various alloying elements present in different steel materials are given below              

1. 18% W; 4% Cr; 1% V; 5% Co; 0.7% C

2. 8% Mo; 4% Cr; 2% V; 6% W; 0.7% C

3. 27% Cr; 3% Ni; 5% Mo; 0.25% C;

4. 18% W; 8% Ni; 0.15% C;

Which of these relate to that of high speed steel

(a)1 and 3                       (b) 1 and 2

(c) 2 and 3                      (d) 2 and 4