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GRAY IRON PROPERTIES

Type G1A G1 G2 Class 40
Tensile strength (psi) 25,000 30,000 40,000
Compressive strength (psi) n/a 120,000 150,000
Heat-treat response n/a Rc 40 min. Rc 50 min.
Hardness (BHN)      
3/4" - 1-1/2" 159-229 179-235 229-285
1-1/2" - 3" 156-201 163-229 207-277
3" - 6" 143-201 151-229 197-268
6" - 20" 143-201 143-201 183-269
Microstructure Highly ferritic Partially ferritic Highly pearlitic

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