Grey Cast Iron

Grey Cast Iron

Grey Cast Iron Parts Develop And Bath Production Company Product Description and Process Grey Cast Iron Parts Develop And Bath Production Company Production process: green sand casting process pre-coated sand casting process resin sand casting process Weight range: from 50 gram to 5,000...

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Grey Cast Iron Parts Develop And Bath Production Company

Product Description and Process

Grey Cast Iron Parts Develop And Bath Production Company  


Production process:

green sand casting process

pre-coated sand casting process

resin sand casting process

Weight range: from 50 gram to 5,000 kilograms for ductile iron casting product


Machining process:

CNC machine, machining center, lathe, mill machine, drill machine, etc.


Surface treatment process:

paint coating, electrophoretic paint coating, electrogalvanizing coating, black oxide coating, phosphate treatment,  powder coating, etc.


Product Material and Uses

Normally production with gray iron HT200, HT250, ductile iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, 100-70-03, etc.

The ductile iron casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, etc.


What is the Microstructure of Grey Cast Iron

Grey iron has graphite flakes entwined with the rest of the structure. Unhardened grey iron is “fragile” compared to other cast metals.  The graphite flakes create areas of weakness in the metal where fractures can begin that will split the metal.  This propensity to fracture is why grey iron has low tensile and impact strength.  Yet the graphite flakes are what create great wear resistance because as friction occurs the graphite acts as a lubricant.  The graphite structure also has great vibration dampening properties because the structure created by the graphite flakes helps cancel out vibrations.


Classification of Grey Iron Classes

In theUnited   States, the classification for grey iron is usually set using the ASTM International standard A48. ASTM A247 is also commonly used to describe the graphite structure.  Grey iron is grouped into classes which correspond with its minimum tensile strength in thousands of pounds per square inch (ksi); (i.e. class 20 grey iron has a minimum tensile strength of 20,000 psi (140 MPa)). Other ASTM standards that deal with gray iron include ASTM A126, ASTM A278, and ASTM A319.

Class 20 grey iron has a ferrite matrix and a high carbon equivalent. Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. To get grey iron above class 40 requires alloying to provide solid solution strengthening.  Grey iron can also be heat treated which modifies the matrix giving the cast iron greater strength. Class 80 is the highest class available for grey iron and it makes the iron have high tensile strength but low impact resistance because class 80 parts are more brittle.


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