Ductile Iron Metal Grade Comparison Grade Matrix / Graphite Tensile Strength (psi) Yield Strength (psi) Elongation Fatigue Strength (psi) Ductile Irons 65-45-12 65,000 45,000 12 40,000 80-55-06 80,000 55,000 6 40,000 100-70-03 100,000 70,000 2 40,000 65-45-12 HRDS 65,000 45,000 12 n/a Large Inventor...