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In steam piping system containing liquid droplets, pipe wall is sometimes damaged by droplet impingement. One of the most important parameters affecting erosion is impact angle. No research has been conducted for the impact angle dependence on erosion for pipe steels. In this study, jet nozzle was used for the high pressure impingement tests of S15C, SUS304 and STPA24, and spray nozzle for the tests of pure aluminum. The MaxDER (Maximum Depth of Erosion Rate) for these three steels was expressed as sin n θ and the exponent is 1.2 -2.5 irrespective of type of steels. Jet nozzle tests with 90°specimen showed that liquid droplet impingement was weakened possibly due to the liquid film formation. Spray nozzle tests revealed that the erosion can be estimated safely in terms of V=V 0 sinθ.

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For piping systems in power plants ， low carbon steels are used 」 n this study ， the effect of impact angle on liquid droplet impingement erosion of S l 5C carbon steel is discussed by comparison with that of pure aluminurn ． It was found that the impact angle dependency was evaluated in tems of Vsin 0 ( 7； impact velocity ，〃：impact angle ) ． The threshold flow velocity was obtained ， below which no erosion occurred ． The norma 且component ofthe threshold velocity increased with the decreased impact angle ， Key Mords ： Erosion ， Low carbon stee1 ， Liquid Droplet ， Impact angle ．