... fine dispersed carbides structure. The core employs high strength nodular iron, thanks to the high chrome content of outer shell, ... shell, the material employs medium-chrome iron, adamite, gray iron, etc. The timing, temperature, molten iron qty should be strictly controlled. The pros ... , etc, and that’s why it has been widely used.Chemical Composition %SymbolCSiMnCrNiMoVHCrⅠ2.30-3.300.30-1.000 ...