(Class 40) gray iron features a tensile strength of 40,000 psi with a compression strength of 150,000 psi. Class 40 gray iron’s hardness ranges from 187 to 269 bhn. The microstructure is essentially pearlitic. It’s used widely for bearing and bushing applications in the hydraulics industry.

But that’s not all it’s good for—class 40 gray iron is suited well for any high wear resistance applications within the limits of the available shapes and sizes. All grades of continuous cast iron, including Class 40 gray iron, are excellent alternatives to steel.

Complete Curve

Cooling Curve

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