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|1. (WO2018180424) BLACK HEART MALLEABLE CAST-IRON AND METHOD FOR MANUFACTURING SAME|
|Applicants:||HITACHI METALS, LTD.
|Title:||BLACK HEART MALLEABLE CAST-IRON AND METHOD FOR MANUFACTURING SAME|
Provided is black heart malleable cast-iron wherein the time required for graphitization can be greatly reduced compared with the conventional and a method for manufacturing the same. The black heart malleable cast iron has a ferrite matrix and aggregated graphite that includes this matrix and includes at least one of (i) 0.0050 – 0.15% by mass bismuth and at least 0.020% by mass manganese and (ii) 0.0050 – 1.0% by mass aluminum and at least 0.0050% by mass of nitrogen, with a grain size number of 8.0 – 10.0 for the crystal particle size in the matrix quantified by comparison of a metal structure photograph and a standard diagram of crystal particle sizes.