Abstract
The effect of the High Temperature Gas Nitriding (HTGN) and tempering treatment of 17Cr-1Ni-0.5C-0.8Mo (CNMo) steel was experimentally investigated. The HTGN was carried out at 1050 °C for 1 h in a gaseous atmosphere containing 98.07 kPa of nitrogen. Chromium nitrides in the austenite and martensite phase appeared at the nitrogen-permeated surface layer after the HTGN treatment. The hardness of the outmost surface of the HTGN treated specimen measured 708 Hv. When it was tempered at 500 °C for 1 h, the hardness of the outmost surface was 763 Hv as a result of the precipitation of mostly micro Cr2N, which was densely packed with a small amount of Cr23C6 and the secondary hardening effect. In addition, an improvement in the corrosion resistance was observed in the tempered specimen.
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