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Pronunciation varies by accent · adjective
(metallurgy) Designating, or pertaining 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..
Use self-hardening when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Self-hardening means (metallurgy) Designating, or pertaining 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..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use self-hardening where its definition matches the intended context.
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