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doi: 10.6088/ijaser.0020101030 Abstract: Experimental and numerical investigations have been conducted for quenching of a hot cylinder with initial temperature of 300 to 400 o C by a subcooled water jet. Water is injected perpendicularly on cylinder circumference via a round jet. Jet diameters of 3 and 4mm are examined. Injected water temperature is controlled to cover range of subcooling from 20 to 60 o C. The distance between the jet and outer cylinder surface is 5 and 10cm. The water velocities are 4 to 8m/s. A numerical model is used to verify the experiments results. Heat fluxes and surface heat transfer coefficients are represented. The study quantifies the effect of changing the initial surface temperature and water flow rates on cooling of steel cylinder at different radial locations, and hence the hardness. Also, the effect of changing cooling water temperature on controlling steel cylinder cooling at different radial locations, and hence the hardness is studied