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How to solve the thermal cracking of gray cast iron?
It is characterized by a dark or almost black oxidized surface 
at the crack, which can be found by visual inspection, 
light transmission method, magnetic flaw detection, 
pressure test, kerosene penetration and other methods.
Here are two ways to prevent thermal cracking:
one) Control reasonable chemical composition and try to 
keep the sulfur content in the molten iron as low as possible
two) When pouring, avoid slag entering the cavity
Nanjing Difeng is committed to the production of nodularizing agents, 
inoculants, vermicularizing agents, covering agents, 
steelmaking deoxidizers, alloy core wires and other products for cast iron. 
which can meet all kinds of enterprises with precision machining 
and special requirements for castings.
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