Hot Working Characteristics of Corrosion-Resistant Alloys G3 and 825

The G3 and 825 alloys, with excellent combination of mechanical properties and corrosion resistance, can be used in hot, and acid environments. Thermal simulation tests were conducted on the alloys G3 and 825 in the THERMECMASTOR-Z simulator, at temperature between 1 030 and 1 300 °C, with strain rate from 1 to 50 s−1 and strain e=0.8. The variations of flow stress with deformation temperature and strain rate were presented. Change of alloy structure with hot deformation and effect of strain rate on alloy dynamic recrystallization have been studied through microstructure observation by OM, SEM and TEM. Moreover, hot plasticity characteristics of alloy were analyzed by temperature-reduction of area curves. The results showed that available hot working temperature for G3, G3-Z and 825 was 1100 to 1 240 °C, 1 130 to 1 220 °C and 1 050 to 1 240 °C, respectively. The reliable information on hot working in the alloy pilot production in steelwork is given.