he shortcoming of heat-resistant cast iron RQTAl_4Si_4 is brittle and apt to produce crack of which elimination demands anintegrated design of the whole casting production process from sand preparation,moulding(cor-making),melting and casting to fettling and cleaning. Because of high loss of alloy elements inmelting and spheroidizing sedundant stirring should be avoided during melting and pouring process. A much more finer microstructure of this kind of cast iron derived from cupola instead of medium-freque...
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