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Increased efficiency and improved environmental protection have been and remain the innovative driving forces in the development of 9–12% chromium heat resistant steel used for power generating plants.1) Due to the operation under the serious circumstance (at temperature around 600°C and pressure around 30 Mpa), this kind of steel contains many alloying elements so that the excellent properties can be ensured by solution strengthening and precipitation strength. Carbides and nitrides are important microstructural constituents in steels. In alloy steels, carbides and nitrides play a significant role in the microstructural evolution so that their precipitation processes have been the subject of intensive studies.2) This precipitation process is essentially the precipitation in multicomponent systems, in which more than two solutes are involved. Furthermore, a remarkable feature of the precipitation of the alloy carbides and nitrides is that the diffusivities of the precipitating substitutional solutes are several orders of magnitude smaller than those of the interstitial solutes, such as carbon and nitrogen. Thus the precipitation study of the alloy carbides and nitrides gives us an opportunity to study a typical multicomponent effect in precipitation processes. The precipitation behavior has been regarded as one of the most important features of alloying Discontinuous Precipitation during Isothermal Transformation in a 9–12% Chromium Ferritic Steel