|   SAE J431 heavy duty automotive gray cast iron, SAE grade G2500a  Subcategory: Gray Cast Iron; Metal Key Words: UNS F10009, ferritic, pearlitic, soft iron castings Material Notes: If Carbon or Silicon is on the high % range end, the other should be on the low % end. Alloying elements not listed may be required. Properties determined from as-cast test bar 30.5 mm diameter. Microstructure: size 2 to 4 type A graphite in a matrix of lamellar pearlite containing not more than 15% free ferrite. Applications include brake drums and clutch plates for moderate service requirements, where high carbon iron is desired to minimize heat checking. 910 kg minimum transverse load, 4.3 mm minimum deflection.
 
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    | DensityHardness, BrinellHardness, KnoopHardness, Rockwell CHardness, VickersTensile Strength, Ultimate
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