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Ductile iron is nodular graphite obtained by spheroidization and inoculation. 
Effectively improve the mechanical properties of cast iron, 
especially the plasticity and toughness, and obtain higher strength than carbon steel.
The technical key of high-quality ductile iron cast sword is: 
optimizing graphite, strengthening matrix, and purifying crystal. 
The key to affecting these three technologies lies in four major elements, 
including spheroidization and inoculation treatment. 
There are also three major elements: the content of chemical components, 
the control of cooling rate and heat treatment.
Follow me to learn more about casting knowledge, 
see you in the next small class.


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