Pearlite heat-resistant steel castings, the material is given priority to with chromium and molybdenum element, because this kind of steel in 500 ~ 500 ℃ has good high temperature strength and process performance, so is widely used in production of under 600 ℃ heat components, more common boiler steel pipe, the steam turbine impeller, rotor, fasteners, and some of the pressure vessel, pipeline, etc. Martensite heat-resistant steel castings, the chromium content in general is 7 ~ 13%, about 650 ℃ can have higher under high temperature strength, oxidation resistance and corrosion resistance to water vapor.But as a result of poor weldability, making the application is limited by the casting.Another is ferritic steel, its characteristic is contained more chromium, aluminum, silicon and other elements, so good oxidation resistance and corrosion resistance to high temperature gas.But lower high temperature strength, wide temperature brittleness and poor weldability, as heat-resistant steel castings are used rarely.
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