24Mn–18Cr–3Ni–0.62N Steel

Steel name: Fe–24Mn–18Cr–3Ni–0.62N
Diagram No.: 3816
Type of diagram: TTP
Chemical composition in weight %: 0.051 wt.% C, 24.62 wt.% Mn, 13.18 wt.% Cr, 3.23 wt.% Ni, 0.62 wt.% N, balance Fe
Steel group: Alloy steels
Note: TTP curve of nitride precipitation. From bellow diagram, if the steel is cooled from 1100 °C and the Cr2N precipitation along grain boundary is less than 0.1–0.5 vol.%, we find that the critical cooling rate is 30 °C/min. The nose or peak of the curve – i.e., the shorTest time to initiate precipitation – of the Cr2N precipitation is about 850 °C. It can be concluded that the final forging temperature should be higher than 850 °C and the cooling rate should be more than 30 °C/min to avoid grain boundary nitride precipitation, which will result in the deterioration of ductility and the cracking of forged products.
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