Cast Iron PropertiesMechanical property reference data for various grey cast irons, includes Tensile strength, Compressive Strength, Shear Modulus of Rupture, Tensile Modulus of Elasticity, Torsional Modulus of Elasticity, Endurance Limit and Brinell hardness data.
The American Society for Testing Materials (ASTM) numbering system for grey cast iron is established such that the numbers corespond to the minimum tensile strength in KPSI. Thus an ASTM No. 20 cast iron has a minimum tensile strength of 20 KPSI. Note particularly that the tabulations are typical values. Multiply strength in KPSI by 6.89 to get strength in MPa.
Steels given for comparison purposes. Tensile and hardness given as rolled and heat treated by water quench and tempered at 425°F. The SAE 1050 heat treated is roughly the properties of most anvils. However the temper condition given is softer. Use the SAE 1095 temper for anvils.
Cast iron is a brittle virtually non-maleable metal that is considered generally inflexible. Cast iron is NOT the metal worked by blacksmiths. It cannot be forged. Cast iron is worked by melting to a liquid and pouring in molds, then by sawing, filing, machining (chip making methods). The stiffness and dampening properties of cast iron make it an excellent material for machine tool frames and parts.