Seven 500-hr corrosion-erosion tests, involving a total of eighteen different materials, were conducted at the Marysville power plant of The Detroit Edison Company to determine the resistance of these materials to the corrosion-erosion type of attack experienced in boiler feed pumps and regulating valves. Two of these tests were for the purpose of verifying the pressure differential used. The other five tests indicated that resistance to corrosion-erosion is materially increased by using chromium-bearing alloy steels. Bronzes and monel are resistant to attack and, to a lesser extent, so is cast iron. Results obtained with a bakelite-lacquer-coated carbon-steel specimen indicated that this coating has considerable promise for use with present boiler feed pumps having cast-carbon-steel casings. The test used is of an accelerated type intended to simulate conditions in actual pumps and valves.