| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gas soft nitriding process of a low-alloy steel, capable of securing a constant depth of a cured layer and suppressing the generation of a compound layer with low toughness.SOLUTION: The gas soft nitriding process of a low-alloy steel for performing gas soft nitriding process by heating the low-alloy steel to 550-620°C for a processing time A of 1.5-10 hours, comprises: performing high Kn value process with a nitriding potential Knof 0.10-1.00, an average value Knof 0.20-0.55 and a processing time of X hours; then performing low Kn value process with a nitriding potential Knof 0.01-0.20, an average value Knof 0.02-0.15, and a processing time of Y hours; and acquiring an average value Knof nitriding potential of soft nitriding process of 0.05-0.20 on the basis of the average value Kn, the average value Kn, the processing time A, and the processing times X and Y of the high Kn value and low Kn value processes.</p> |
