Several heat-treatment schedules were conducted on Haynes 282, ranging from solutionizing at 1150oC, 1135oC to 1020oC for 2 hours. The samples were air cooled, followed by aging at 1020oC, 788oC, 7500oC, 780oC, 800oC, 825oC, 850oC, 875oC and 900oC for 1, 2, 8 and 16 hours respectively, before finally cooled down at different rates: air-cool, water-quench and furnace-cool. Also Inconel 718 samples were heat-treated by solutionizing at 955oC for 1hour; air–cool, and aged at 720oC for 8hours, furnace–cool and aged at 620oC for another 8hours and air-cool. The hardness, tensile and corrosion tests alongside optical and scanning electron spectroscopy were conducted. The results showed that a new set of heat-treatment (1020oC/1hr/AC+800oC/1hr/FC) can be applied for improved mechanical performances of Haynes 282 superalloy. This established the superiority of the corrosion characteristics of Haynes 282 recently developed, over Inconel 718, which has been in existence for quite some time.