highspeed steel

high-speed steel

noun
an especially hard, heat-resistant steel for use in lathe tools and for other applications involving high friction and wear.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
high-speed steel
 
n
any of various steels that retain their hardness at high temperatures and are thus suitable for making tools used on lathes and other high-speed machines

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