| 摘要 |
PURPOSE:To omit a normalizing stage and to decrease considerably heat energy by heating a steel material to a specific temp. then cooling quickly the steel material down to the specific depth from the surface and subjecting immediately the material to forging. CONSTITUTION:A steel material is heated to >=1,100 deg.C and is then quickly cooled down to <=1,000 deg.C in the part of 5-10mm. from the surface of said material. While the inside of the steel material is still soft right thereafter, the material is subjected to hot forging and partial machining, by which a machine part is completed. The material withstands to fatigue and wear is thus produced without normalizing.
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