Self-hardening Self`-hard"en*ing, a. (Metal.) Designating, or pert. to, any of various steels that harden when heated to above a red heat and cooled in air, usually in a blast of cold air with moderate rapidity, without quenching. Such steels are alloys of iron and carbon with manganese, tungsten and manganese, chromium, molybdenum and manganese, etc. They are chiefly used as high-speed steels. -- {Self`-hard"en*ed}, a. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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  • self-hardening — self hardened, adj. /self hahr dn ing, self /, adj. noting or pertaining to any of various steels that harden after heating without quenching or other treatment. [1900 05] * * * …   Universalium

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  • self-hardening — /sɛlf ˈhadnɪŋ/ (say self hahdning) adjective denoting or relating to any of certain steels which harden without the usual quenching, etc., necessary for ordinary steel. –self hardened, adjective …  

  • self-tapping screw — noun A screw, with a hardened thread, that forms its own internal thread when driven into a relatively soft material (such as sheet metal) …   Wiktionary

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  • international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …   Universalium

  • hand tool — any tool or implement designed for manual operation. * * * Introduction  any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …   Universalium

  • education — /ej oo kay sheuhn/, n. 1. the act or process of imparting or acquiring general knowledge, developing the powers of reasoning and judgment, and generally of preparing oneself or others intellectually for mature life. 2. the act or process of… …   Universalium

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