What is the essential difference between ductile iron pipe fittings and gray cast iron

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What is the essential difference between ductile iron pipe fittings and gray cast iron

Nodular cast pig iron is also a kind of cast pig iron, but it is low in sulfur and phosphorus. Low sulfur makes carbon fully graphitized in iron. Add a certain amount of spheroidizing agent (commonly used ferrosilicon, magnesium, etc.) to spheroidize the graphite in the cast iron before pouring the molten iron (spheroidal graphite iron). Because carbon (graphite) exists in the cast iron matrix in a spherical shape, it improves its splitting effect on the matrix, and the tensile strength, yield strength, plasticity, and impact toughness of ductile cast iron are greatly improved. And has the advantages of wear resistance, shock absorption, good process performance, low cost, etc., it has been widely substituted for malleable cast iron and some cast steel, forged steel parts, such as crankshafts, connecting rods, rolls, automobile rear axles, etc.

Most or all of the carbon in cast iron exists as free flake graphite. The fracture is gray. It has good casting performance, good cutting processability, wear resistance, and good wear resistance. In addition, it has simple melting ingredients and low cost. It is widely used in the manufacture of structurally complex castings and wear-resistant parts.