Commercial grade ductile iron, 80% nodularity, nodules density essentially 100/150, annealed, ferritic matrix, no carbide, amount of chunk graphite from minor to nil, balanced composition of C and Si, low P content, lead content in trace quantities only. Often specified according to ASTM A-536 Gr 60 40 18, ASTM A-395, DIN 1563 EN-GJS-400-18 .