Ductile cast iron is the purpose of normalizing will be converted into fine pearlite matrix organization. Process is the substrate of ferrite and pearlite ductile iron pieces to heated to 850-900 ℃ temperature,the original ferrite and pearlite transformation to austenite, and a portion of the spheroidal graphite dissolves in austenite,air cooling after heat preservation austenitic transformation of fine pearlite, thus the strength of the castings.

Ductile iron is through get spheroidal graphite spheroidization and inoculation,effectively improve the mechanical properties of cast iron,especially improve the plasticity and toughness,and high intensity than carbon steel.Ductile iron is processed and bred to obtain the spherical graphite,which effectively improve the mechanical properties of ductile iron casting,in particular to improve the ductility and toughness.The strength of ductile iron casting is higher more than carbon steel casting.The overrall performance of ductile iron is close to steel,so it is successfully used to cast some of complicated parts with high demand. Casting application has a long history.Ancient people use casting for coins,tablets,weapons,tools and some life appliances.In modern times,the casting machine parts mainly used for the blank,some precision castings,also can be directly used for machine parts. Gray iron is the most versatile of all foundry metals.

The high carbon content is responsible for ease of melting and casting in the foundry and for ease of machining in subsequent manufacturing. The low degree or absence of shrinkage and high fluidity provide maximum freedom of design for the engineer. By suitable adjustment in composition and selection of casting method, tensile strength can be varied from less than 20,000 psi to over 60,000 psi and hardness from 100 to 300 BHN in the as-cast condition.

Our company has strong technical force and powerful production capacity and mainly casts all kinds of gray iron casting, stainless steel investment casting, which can be widely used in many industrial departments such as engineering machinery, mining machinery, rubber machinery, agricultural machinery, shipbuilding industry and pump body and valve iry.

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