| 摘要 |
A high carbon carburizing method is provided to obtain a product with a high Vickers hardness and improved abrasion resistance and wear resistance by press forming a small part requiring high precision, and to secure external competitiveness by reducing production costs. In a method for performing a high carbon carburizing process in which a heat treatment completed workpiece satisfies a surface hardness of at least Hv 800 and a Vickers hardness of at least Hv 550 at an effective hardening depth of 0.2 to 1.2 mm, a high carbon carburizing method comprises: performing a first carburizing process of the workpiece at 940 deg.C for 190 minutes; holding the first carburized workpiece at 870 deg.C and subjecting the workpiece to oil-cooling; performing a second carburizing process of the oil-cooled workpiece at 890 deg.C for 270 minutes; holding the second carburized workpiece at 850 deg.C for 10 minutes, and oil-cooling the workpiece until temperature of the workpiece becomes 60 deg.C; performing a tempering process of the oil-cooled workpiece at 160 deg.C for 150 minutes; and subjecting the tempered workpiece to an air-cooling process.
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