tool steel

from WordNet (r) 3.0 (2006)
tool steel
    n 1: alloy steel that is suitable for making tools; is hard and
         tough and can retain a cutting edge
from The Collaborative International Dictionary of English v.0.48
Tool steel \Tool steel\
   Hard steel, usually crucible steel, capable of being tempered
   so as to be suitable for tools.
   [Webster 1913 Suppl.]
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