The ductile iron grade of EN-GJS-400 is from Germany standard DIN EN 1563. It has been replaced by the standard DIN 1693, so the EN-GJS-400 has been changed into GGG40.
However, according to the DIN EN 1563, this grade should include four grades as EN-GJS-400-15, EN-GJS-400-18, EN-GJS-400-18LT and EN-GJS-400-18RT. So, the EN-GJS-400 has been changed into GGG40, and the other three grades has been changed into GGG40.3. Therefore, when you see the GGG40.3 on the drawings, you must pay more attention to the elongation (18%) and their impact requirements in the low temperature.
Physical properties of EN-GJS-400
Tensile strength min.400 Mpa, Yield strength min. 250 Mpa, Elongation min. 15%, Hardness range 130-180 HBS. Microstructure is mainly ferrite. As for the physical properties of GGG40.3, please check the standard DIN 1693.
Chemical components of EN-GJS-400
There is no requirement for the chemical components in any standard, as long as the iron foundries could make the ductile iron castings to meet the physical properties, then these castings will be qualified and will be taken to meet the standards.
However, according to the experiences of Dandong Foundry in China, the following chemical components should be a reasonable range for the production. C: 3.50-3.78%, Si: 2.80-2.85%, Mn: 0.2-0.5, P: 0.03-0.06, S: 0.02-0.035, Mg: 0.042-0.060.
Advantages of EN-GJS-400 ductile iron
EN-GJS-400 ductile iron, also called as nodular iron, is a very good and common cast iron. It has good tensile strength and yield strength, and the largest elongation compared with other ductile iron grades. Moreover, it has the best impact property, casting and machining functions. Therefore, EN-GJS-400 ductile iron has been widely used in the pressure pipes and fittings, automotive applications, agriculture, road and construction applications and many general engineering applications.
Problems of EN-GJS-400 ductile iron
Besides of the common sand casting defects, such as sand holes, air holes, shrinkage, cracks and deformation, EN-GJS-400 ductile iron has an important requirement for the percent of spheroidization, or called as nodularity, spheroidization rate. Although this property is not required in the standards, but many iron castings used in automotive applications will require very high spheroidization rate as 85%, 90%, 95% or higher.
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