Abstract: The corrosion rates and tensile properties of mild steel rods, quenched in water and tempered within temperature range of 200-600�C at an interval of 100�C, were experimentally investigated and presented. Sodium chloride solution containing approximately 3.5% weight of solute, prepared from 97.5% table salt, was used as the corrosive medium. Some as-quenched and tempered specimens were retained as non-corroded specimens while other identical specimens were totally immersed in seawater medium for 90 uninterrupted days. Corrosion in saltwater was found to have adverse effects on both the strength and ductility of the specimens; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were found to decrease from 523.44-498.68 MPa and from 12.007.14%, respectively due to corrosion in saltwater. Also, increase in tempering temperature was observed to have reduction effects on strength but increasing effect on ductility; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were observed to vary from 523.440-470.39 MPa and from 12.0015.28%, respectively due to tempering at 400�C for 45 min. Weight loss of test specimens was measured to evaluate the corrosion rate. However, the susceptibility of the specimens to corrosion is reduced with increase in tempering temperature. Remarkable resistance to corrosion was observed within temperature range of 300600�C; the corrosion rate of as-quenched specimen decreases from 31.43-17.85 mils year ¹ due to tempering at 400�C for 45 min. The percentages of resilience retained after tempering are found to be closer in values to the percentage corrosion rates of identical specimens. This shows corrosion rate to be a function of the level of resilience retained in the specimens.