Engineering Materials
1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%
Vanadium 18%, chromium 1% and tungsten 4%
None of these
Vanadium 1%, chromium 4% and tungsten 18%

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Engineering Materials
Cobalt in steel

Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
Gives ductility, toughness, tensile strength and anti corrosion property
Improves cutting ability and reduce hardenability
Improves wear resistance, cutting ability and toughness

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