| 摘要 |
PURPOSE:To obtain a carburized steel parts each having a bright surface not colored by carburization by carburizing steel parts in a carburizing atmosphere, heating the carburized parts in vacuum, and quenching them. CONSTITUTION:Steel parts W are put in a carburizing chamber 1, where they are carburized in a carburizing atmosphere of converted gaseous hydrocarbon under atmospheric pressure. The carburized steel parts W are put in a vacuum heating chamber 16, where they are heated in vacuum for a prescribed time. The heated steel parts W are then put in a quenching chamber 12, where they are quenched. Thus, carburized steel parts each having a bright surface not colored by carburization are obtd.
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