Spheroidal Graphite Cast Iron Castings

 

Ductile cast iron, which is represent a group of cast iron, also called nodular iron. Nodular cast iron obtains nodular graphite through spheroidization and inoculation treatment, which effectively improves the mechanical properties of the cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel.

Ductile Iron Comparison			Chemical Composition(％)								Matrix Structure
GB/T 1348-1988	ASTM A536-84(2004)	EN 1563:-1997	C	Si	Mn	P	S	Mg	Re	others
QT400-18	60-40-18① F32800	GJS-400-18 JS1020	3.6-3.8	2.3-2.7	＜0.5	＜0.08	＜0.025	0.03-0.05	0.02-0.03	-	Annealed Ferrite
QT400-15	60-42-10 F32900	GJS-400-15 JS1030	3.5-3.6	3.0-3.2	＜0.5	＜0.07	＜0.02	0.04	0.02	-	Annealed Ferrite
QT450-10	65-45-12 F33100	GJS-450-10 JS1040	3.4-3.9	2.7-3.0	0.2-0.5	＜0.07	＜0.03	0.06-0.1	0.03-0.1	-	Annealed Ferrite
QT500-7	70-50-05	GJS-500-7 JS1050	3.6-3.8	2.5-2.9	＜0.6	＜0.08	＜0.025	0.03-0.05	0.03-0.05	-	Pearlite + Ferrite
QT600-3	80-60-03② F34100	GJS-600-3 JS1060	3.6-3.8	2.0-2.4	0.5-0.7	＜0.08	＜0.025	0.035-0.05	0.025-0.045	-	Normalized Pearlite
QT700-2	100-70-03 F34800	GJS-700-2 JS1070	3.7-4.0	2.3-2.6	0.5-0.8	＜0.08	＜0.02	0.035-0.065	0.035-0.065	Mo0.15-0.4 Cu0.4-0.8	Mix Microstructure
QT800-2	-	GJS-800-2 JS1080	3.7-4.0	＜2.5	＜0.5	＜0.07	＜0.03	-	-	Mo0.39 Cu0.82	Mix Microstructure
QT900-2	120-90-02 F36200	GJS-900-2 JS1090	3.5-3.7	2.7-3.0	＜0.5	＜0.08	＜0.025	0.03-0.05	0.025-0.045	Mo0.15-0.25; Cu0.5-0.7	Lower Bainite
① from ASTM A716-2003. ② from ASTM A476/A476M-2000

Ductile iron is not a single material but is part of a group of materials which can be produced to have a wide range of properties through control of the microstructure. The common defining characteristic of this group of materials is the shape of the graphite. In ductile irons, the graphite is in the form of nodules rather than flakes as it is in grey iron.

 

 

 

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