The most popular and standard typeforall purpose tool steels is 18:4:1 High Speed Steel (H.S.S.), which contains.

A

18% chromium, 4% tungsten and 1% vanadium

B

18% tungsten, 4% vanadium and 1% chromium

C

18% tungsten, 4% chromium and 1% vanadium

D

18% vanadium, 4% chromium and 1% tungsten