Mechanical Properties of Ductile iron EN-GJS-400-18:
The minimum tensile strength of EN-GJS-400-18 is 400 Mpa; the minimum yield strength is 250 Mpa; and the minimum elongation is 18%.
The matrix of this grade is completely ferrite, with high ductility and impact strength. Therefore, it can be used at a temperature of -20°C. In addition, heat treatment is part of the manufacturing process.
EN-GJS-400-18 ductile iron can ensure notched impact toughness at -20°C. In terms of safety, it has more advantages than cast steel. Cast steel is prone to cracking due to its extremely high shrinkage. One of the reasons is the expansion caused by the graphite spheres formed in the ferrite matrix. This expansion offsets the shrinkage of the material (which is low anyway), thereby preventing cracking.
This grade of ductile iron has a minimum elongation at break of 18%. And due to its high ductility, it is also suitable for low temperature applications. As early as 1980, Dr. Betschart determined the allowable stress of ductile cast iron in his thesis entitled “Research in Modern Cast Metal for Structures”.
Applications of Ductile iron EN-GJS-400-18:
Ductile cast iron EN-GJS-400-18 is suitable not only for the production of safety components for cable cars and ski lifts in high mountain areas, but also for the production of heavy chassis components, automobile crankshafts and wheels.
This material is also widely used in the production of iron castings for wind power, forestry and contractor machinery, valves, brakes,, consoles, pressure tanks, high-pressure equipment housings, and cooling components. And when the temperature is as low as -20ºC, where the impact strength needs to be guaranteed.
Due to its many advantages, the “modern form” of ductile iron has largely replaced cast steel.