18-4-1
high speed steel consists of :
18%W, 4%V, 1% Cr
18%Cr,
4%V, 1% Cr
18%W, 4%Cr, 1% V
18%W, 4%Ni, 1% Cr
18%W, 4%Cr, 1% V
●High
speed steels (HSS) are most commonly operated as cutting tools at
much higher speed i.e. twice or thrice whereas tool steel.
●It
contains 18% tungsten, 4% chromium and 1 % vanadium, 0.8% carbon and remaining
iron.
●High
speed steels is generally used for lathe, planer and shaper tool, drill,
milling cutter, punch.
Hence,
the correct option is (C).
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