Grey iron supply a hardness level that is machinable. Machining Capability of Grey Iron Castings The matrix however is quite responsive to heat treatment just as in the case of steel.

Although the graphite may increase in volume if a pearlitic iron is completely fertilized, in which case, the graphite is usually deposited on the flakes originally present. Such heat treatment will not change the graphite structure. But For some purposes, gray iron castings can also be heat treated, such as to relieve residual stresses, improve machinability, increase the hardness of the surface either through induction or flame hardening, or harden the entire section through an oil quench and draw treatment. Most of the time, grey iron castings are supplied to our customers in the as-cast condition directly. As good rigidity of resin sand and high strength of sand mold when early casting, then we could effectively eliminate the shrinkage cavity, shrinkage defects of gray iron castings. Compare with other sand casting processes, resin sand casting is a relatively precise casting method close to investment casting. The main sand casting process for small and medium castings. With the lost foam casting process, we can help our customers to obtain high accuracy products with excellent surface finish, and fewer machining operations will be done. The only investment casting process for cast iron components, which has lots of advantages to produce small gray iron investment castings, such as saved mold cost, shorten the production cycle and improve production efficiency. In our foundry, we can make grey iron castings in two types: Type 1: Lost Foam Casting Our main process method of Grey Iron CastingsĬommonly used grey iron castings process in the market is produced by sand casting. But grey iron cannot be forged or extruded at any temperature. The finished iron casting may be machined. Gray iron castings are made by pouring molten iron alloys into molds. Gray iron casting is finished in a foundry. So grey iron is widely used for valves, engine blocks, brake drums, pump housings, and cast-iron cookware. It has features of high thermal conductivity, strength, durability, machinability, and low cost. The heat treatments can yield even higher mechanical properties. Gray iron can meet specific requirements for hardness and wear. So it is called grey iron because of the gray color of the fracture. Grey iron or grey cast iron is a material type of cast iron with a graphitic microstructure. It also possesses traces of phosphorous, sulfur, silicon, and manganese. Grey iron is an alloy made of iron and carbon. What is Gray iron casting? Gray iron casting, also called Grey Iron Casting, is a casting part that is typically made by smelting grey iron.

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