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This study present the effect heat treatment Quenching and Tempering on martensitic stainless steel material. The heat treatment Quenching is done at 1020 Celcius of temperature within 60 minutes holding time. In this treatment oil SAE 40 is used as cooling media. As for maintaining the toughness of the material, Tempering is applied at 200 and 300 Celcius of temperature within 45 minutes holding time. Then, the material is cooled down using air at temperature room. The results showed the Quenching treatment increases the material hardness by 192 percent compared to the base material. And with the tempering treatment the hardness of the material is slightly decreases, but still above the material without heat treatment. Futhermore, the corrosion rate decreases significantly by 47 percent. Therefore, the heat treatment, Quenching and Tempering, on martensitic stainless steel has greatly reduce the corrosion rate of the material