Ductile iron - GGG

Ductile iron, also known as SG iron, is cast iron with spheroidal graphite. It is a good and often cheaper alternative to forged carbon steel items. Spheroidal graphite replaces ordinary steel and has better properties in many areas. The more pearlite in relation to ferrite, the stronger the iron. There are differences in the mechanical properties of iron, depending on how much of the iron consists of perlite and how much it consists of ferrite. 

SG iron is used, among other things, for wheel suspension, turbochargers, hydraulic components and gears.

Alloys within SG iron:
EN-GJS-400-15 / GGG 40 – typically for wheel hubs
EN-GJS-400-18-LT – typical for wind power
EN-GJS-500-7 / GGG 50 – typically for diesel engines
EN-GJS-600-3 / GGG 60 – typically for flanges
EN-GJS-700-2 / GGG 70 – typically for crankshafts