Process for the production of hardened parts of steel
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United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
May 17, 1999
filing date -
May 15, 1998
priority date (Note) -
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Abstract
A method for producing hardened parts of steel from an air-hardening steel comprising the steps of heating the steel is heated to a temperature above 1,100.degree. C., hot-working the steel parts until they reach the A.sub.1 emperature, cooling the steel parts in air to about 280.degree. C. under simultaneous thermo-mechanical sizing treatment, then cooling the steel parts in air to room temperature, stress relief treating the steel parts at 150-250.degree. C., and hard-machining the steel parts.
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