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See Chinese contents: GB/T 9441-2009 GB/T 9441-2009: Metallographic test for spheroidal graphite cast iron
This standard specifies the method for assessing the microstructure of spheroidal graphite cast iron in optical microscopes. This standard specifies the methods for assessing spheroidizing grade, graphite size, number of nodular graphite, number of pearlite, number of ferrite in dispersed distribution, number of phosphide eutectic, and number of carbide; it lists out the corresponding standard figures.
