There are many different cast iron grades in different countries/regions. Usually, we can know the tensile strength and elongation of different grades of cast iron from the grades chart. Here, we have listed all common grades of gray cast iron and ductile iron for your reference.

Please check the following gray cast iron and ductile iron grades in all countries/regions.

Please note that these levels in the same row can be substituted for each other. However, there are still some subtle differences between them. For example, for ductile cast iron in American grades, the minimum elongation of 70-50-05 is 5%. But according to China’s equivalent grade, QT500-7 requires a minimum elongation rate of 7%. Moreover, if there are some special letters on the grade, such as “L”, it usually means that the material needs to be used at low temperatures. Therefore, you must pay more attention to the impact requirements of the material at low temperatures. Compared with products of the same grade without “L”, their impact resistance requires higher standards.

 

Table 1. Grey Cast Iron Grades

NO.	Country	Grey Cast Iron Grades
1	China	–	HT350	HT300	HT250	HT200	HT150	HT100
2	Japan	–	FC350	FC300	FC250	FC200	FC150	FC100
3	USA	NO.60	NO.50	NO.45	NO.35	NO.30	NO.20	–
4	Russia	(40) C Ч 40	(35) C Ч 35	(30) C Ч 30	(25) C Ч 25	(20) C Ч 20	(15) C Ч 15	(10) C Ч 10
5	Germany	GG40	GG35	GG30	GG25	GG20	GG15	–
6	Italy	–	G35	G30	G25	G20	G15	G10
7	France	FGL400	FGL350	FGL300	FGL250	FGL200	FGL150	–
8	England	–	350	300	250	200	150	100
9	Poland	Z140	Z135	Z130	Z125	Z120	Z115	–
10	India	FG400	FG350	FG300	FG260	FG200	FG150	–
11	Romania	FC400	FC350	FC300	FC250	FC200	FC150	–
12	Spain	–	FG35	FG30	FG25	FG20	FG15	–
13	Belgium	FGG40	FGG35	FGG30	FGG25	FGG20	FGG15	FGG10
14	Australia	T400	T350	T300	T260	T220	T150	–
15	Sweden	O140	O135	O130	O125	O120	O115	O110
16	Hungary	OV40	OV35	OV30	OV25	OV20	OV15	–
17	Bulgaria	–	Vch35	Vch30	Vch25	Vch20	Vch15	–
18	ISO	–	350	300	250	200	150	100
19	COPANT	FG400	FG350	FG300	FG250	FG200	FG150	FG100
20	China Taiwan	–	–	FC300	FC250	FC200	FC150	FC100
21	Holland	–	GG35	GG30	GG25	GG20	GG15	–
22	Luxembourg	FGG40	FGG35	FGG30	FGG25	FGG20	FGG15	–
23	Austria	–	GG35	GG30	GG25	GG20	GG15	–

 

Table 2. Ductile Cast Iron Grades

NO.	Country	Ductile Cast Iron Grades
1	China	QT400-18	QT450-10	QT500-7	QT600-3	QT700-2	QT800-2	QT900-2
2	Japan	FCD400	FCD450	FCD500	FCD600	FCD700	FCD800	–
3	USA	60-40-18	65-45-12	70-50-05	80-60-03	100-70-03	120-90-02	–
4	Russia	(40 )B Ч 40	(45) B Ч 45	(50) B Ч 50	(60) B Ч 60	(70) B Ч 70	(80) B Ч 80	(100) B Ч 100
5	Germany	GGG40	GGG45	GGG50	GGG60	GGG70	GGG80	–
6	Italy	GS370-17	GS400-12	GS500-7	GS600-2	GS700-2	GSS800-2	–
7	France	FGS370-17	FGS400-12	FGS500-7	FGS600-2	FGS700-2	FGS800-2	–
8	England	400/17	420/12	500/7	600/7	700/2	800/2	900/2
9	Poland	ZS3817	ZS4012	ZS4505 ZS5002	ZS6002	ZS7002	ZS8002	ZS9002
10	India	SG370/17	SG400/12	SG500/7	SG600/3	SG700/2	SG800/2	–
11	Romania	–	–	–	–	FGN70-3	–	–
12	Spain	FGE38-17	FGE42-12	FGE50-7	FGE60-2	FGE70-2	FGE80-2	–
13	Belgium	FNG38-17	FNG42-12	FNG50-7	FNG60-2	FNG70-2	FNG80-2	–
14	Australia	300-17	400-12	500-7	600-3	700-2	800-2	–
15	Sweden	0717-02	–	0727-02	0732-03	0737-01	0864-03	–
16	Hungary	GǒV38	GǒV40	GǒV50	GǒV60	GǒV70	–	–
17	Bulgaria	380-17	400-12	450-5 500-2	600-2	700-2	800-2	900-2
18	ISO	400-18	450-10	500-7	600-3	700-2	800-2	900-2
19	COPANT	–	FMNP45007	FMNP55005	FMNP65003	FMNP70002	–	–
20	China Taiwan	GRP400	–	GRP500	GRP600	GRP700	GRP800	–
21	Holland	GN38	GN42	GN50	GN60	GN70	–	–
22	Luxembourg	FNG38-17	FNG42-12	FNG50-7	FNG60-2	FNG70-2	FNG80-2	–
23	Austria	SG38	SG42	SG50	SG60	SG70	–	–