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The properties of grey cast iron, gray iron

Grey cast iron is cheaper and easier for production, so this material has been widely used for industrial and residential fields. Therefore, learning about its property is very important.

1. Chemical Properties of grey cast iron

According to the different grades, the grey cast iron has different chemical components, however, normally, all gray iron grades have the following chemical component range:

Carbon (C) 2.8 - 3.9%, Silicon (Si) 1.1 - 2.6%, Manganese (Mn) 0.5 - 1.2%, P ≤ 0.3%, S ≤ 0.15%.

However, you can not inspect the quality by chemical components. The iron foundries have right to adjust them as long as they can meet the mechanical properties.

2. Mechanical Properties of grey cast iron

According to the different grades, grey cast iron has different mechanical properties.

Their tensile strength is between 72500 psi to 188500 psi. The yield strength is between 21700 psi to 72500 psi. Grey iron castings almost have no elongation.

The impact toughness is less than 11 J/cm2, so if your parts need to stand impact, then ductile iron will be the better choice.

The hardness of gray iron is between 145 to 280 HBS (Brinell Hardness). If customers have special requirements to the hardness, you should tell the casting suppliers, otherwise, hardness can not be an inspection standard.

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