Cast Iron Grade

Gray Cast Iron Grade

Below is a comprehensive gray cast iron grade cross‑reference table covering global mainstream standards. The first data row indicates minimum tensile strength in MPa. You may find equivalent material grades for ISO, Chinese HT series, USA, Japanese FC series, German GG series and other regional norms, which supports material selection and technical communication for brake drum and cast‑iron parts sourcing.

No.	Country	Cast Iron Grade
‑	Min Tensile Strength (MPa)	400	350	300	250	200	150	100
1	ISO	—	350	300	250	200	150	100
2	USA	NO.60	NO.50	NO.45	NO.35	NO.30	NO.20	—
3	China	—	HT350	HT300	HT250	HT200	HT150	HT100
4	Japan	—	FC350	FC300	FC250	FC200	FC150	FC100
5	Former Soviet Union	СЧ40	СЧ35	СЧ30	СЧ25	СЧ20	СЧ15	СЧ10
6	Germany	GG40	GG35	GG30	GG25	GG20	GG15	—
7	Italy	—	G35	G30	G25	G20	G15	G10
8	France	FGL400	FGL350	FGL300	FGL250	FGL200	FGL150	—
9	United Kingdom	—	350	300	250	200	150	100
10	Poland	Z140	Z135	Z130	Z125	Z120	Z115	—
11	India	FG400	FG350	FG300	FG260	FG200	FG150	—
12	Romania	FC400	FC350	FC300	FC250	FC200	FC150	—
13	Spain	—	FG35	FG30	FG25	FG20	FG15	—
14	Belgium	FGG40	FGG35	FGG30	FGG25	FGG20	FGG15	FGG10
15	Australia	T400	T350	T300	T260	T220	T150	—
16	Sweden	O140	O135	O130	O125	O120	O115	O110
17	Hungary	OV40	OV35	OV30	OV25	OV20	OV15	—
18	Bulgaria	—	Vch35	Vch30	Vch25	Vch20	Vch15	—
19	COPANT	FG400	FG350	FG300	FG250	FG200	FG150	FG100
20	Taiwan‑China	—	—	FC300	FC250	FC200	FC150	FC100
21	Netherlands	—	GG35	GG30	GG25	GG20	GG15	—
22	Luxembourg	FGG40	FGG35	FGG30	FGG25	FGG20	FGG15	—
23	Austria	—	GG35	GG30	GG25	GG20	GG15	—

Ductile Case Iron Grade

Each ductile‑iron grade consists of two sets of figures separated by a hyphen, for example QT400‑18, 400‑18, 60‑40‑18:

The first number: Minimum tensile strength in MPa.
The last number: Minimum percentage elongation (%).
American standards (ASTM) adopt three‑digit groups such as 60‑40‑18:

60 = Minimum tensile strength (ksi)
40 = Minimum yield strength (ksi)
18 = Minimum elongation (%)

Example：ISO 400‑18

400: Minimum tensile strength ≥400 MPa
18: Minimum elongation ≥18%

No.	Country	Ductile Iron Grade
1	ISO	400‑18	450‑10	500‑7	600‑3	700‑2	800‑2	900‑2
2	USA	60‑40‑18	65‑45‑12	70‑50‑05	80‑60‑03	100‑70‑03	120‑90‑02	—
3	China	QT400‑18	QT450‑10	QT500‑7	QT600‑3	QT700‑2	QT800‑2	QT900‑2
4	Japan	FCD400	FCD450	FCD500	FCD600	FCD700	FCD800	—
5	Former Soviet Union	ВЧ40	ВЧ45	ВЧ50	ВЧ60	ВЧ70	ВЧ80	ВЧ100
6	Germany	GGG40	—	GGG50	GGG60	GGG70	GGG80	—
7	Italy	GS370‑17	GS400‑12	GS500‑7	GS600‑2	GS700‑2	GS800‑2	—
8	France	FGS370‑17	FGS400‑12	FGS500‑7	FGS600‑2	FGS700‑2	FGS800‑2	—
9	United Kingdom	400/17	420/12	500/7	600/7	700/2	800/2	900/2
10	Poland	ZS3817	ZS4012	ZS4505 ZS5002	ZS6002	ZS7002	ZS8002	ZS9002
11	India	SG370/17	SG400/12	SG500/7	SG600/3	SG700/2	SG800/2	—
12	Romania	—	—	—	—	FGN70‑3	—	—
13	Spain	FGE38‑17	FGE42‑12	FGE50‑7	FGE60‑2	FGE70‑2	FGE80‑2	—
14	Belgium	FNG38‑17	FNG42‑12	FNG50‑7	FNG60‑2	FNG70‑2	FNG80‑2	—
15	Australia	300‑17	400‑12	500‑7	600‑3	700‑2	800‑2	—
16	Sweden	0717‑02	—	0727‑02	0732‑03	0737‑01	0864‑03	—
17	Hungary	GδV38	GδV40	GδV50	GδV60	GδV70	—	—
18	Bulgaria	380‑17	400‑12	450‑5 500‑2	600‑2	700‑2	800‑2	900‑2
19	COPANT	—	FMNP45007	FMNP55005	FMNP65003	FMNP70002	—	—
20	Finland	GRP400	—	GRP500	GRP600	GRP700	GRP800	—
21	Netherlands	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	—	—

Application of Gray Iron Casting¹

Gray cast‑iron grades are classified based on their tensile‑strength properties. Choosing the correct grade is vital for each project. Gray cast iron comes in multiple grades, with material characteristics defining their respective end‑use applications.

Gray Iron Casting: Advantages and its Industrial Use ↩︎

Cast Iron Grade

Gray Cast Iron Grade

Ductile Case Iron Grade

Application of Gray Iron Casting1

Application of Gray Iron Casting¹