ASTM A48 Grey Iron

ASTM A48 Grey Iron

Grey Cast Iron ASTM A48 Class 30 Material Foundry Custom Parts Product Description and Process Grey Cast Iron ASTM A48 Class 30 Material Foundry Custom Parts Production process: green sand casting process pre-coated sand casting process resin sand casting process Weight range: from 50 gram to...

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Grey Cast Iron ASTM A48 Class 30 Material Foundry Custom Parts  

Product Description and Process

Grey Cast Iron ASTM A48 Class 30 Material Foundry Custom Parts


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.


Grey Iron Magnified to Show the Flakes of Graphite

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If you use a powerful microscope you can see the graphitic microstructure that makes grey iron so easily identifiable.  In a grey iron casting, you can see little black flakes of graphite.  These flakes cause fractures and cause the material to have a grey appearance. The mechanical properties of grey iron are controlled by the size and shape of the graphite flakes present in the microstructure and can be characterized according to the guidelines given by the ASTM.

There are more pounds of grey iron castings produced every year throughout the world than any other type of casting.  Just about every manhole cover is from grey iron and the disc brakes on your car are most likely grey iron as well.  Other common uses for grey iron include:

• Gears

• Hydraulic components

• Automotive suspension components

• Plow shares

• Pumps

• Linkages

• Stove parts

• Steering knuckles

• Tractor parts

• Valves

• Truck suspension components

• Other truck parts

• Wind turbine housings.

• Weights and counter-weights

• Machinery bases


The popularity of grey cast iron components is because grey iron is one of the cheapest types of iron castings to produce.  It has acceptable ductility, tensile strength, yield strength, and impact resistance for most applications.  Grey Iron is also excellent in its ability to dampen vibrations making it ideal for machinery bases and as well as many housing applications.  Grey iron has high thermal conductivity meaning it moves heat more easily through the metal.

A final benefit of grey iron is its ability to withstand thermal cycling well.  Thermal cycling is where the component goes back and forth between warmer and colder temperatures.  While thermal cycling can create stress and premature failure in some types of metal castings, grey iron has proven to endure the strain of thermal cycling quite well and not stress as easily.

While grey cast iron has less tensile strength and shock resistance than most other castings or even steals, it has compressive strength that is comparable to low- and medium-carbon steel. These mechanical properties are controlled by the size and shape of the graphite flakes present in the microstructure.


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