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SG Iron Grades

SG iron is also called as spheroidal graphite cast iron, in USA, they are also called as ductile iron. There are many different sg iron grades in different countries and standards, however, most of grades have similar requirements to the mechanical properties, especially to tensile strength, yield strength and elongation. The followings are the main sg iron grades worldwide.

Country

Standard

SG Iron Grades (Spheroidal Graphite Cast Iron)

ISO

ISO 1083

400-15
400-18

450-10

500-7

600-3

700-2

800-2

900-2

China

GB 1348

QT400-18

QT450-10

QT500-7

QT600-3

QT700-2

QT800-2

QT900-2

USA

ASTM A536

60-40-18

60-42-10
65-45-12

70-50-05

80-55-06
80-60-03

100-70-03

120-90-02

-

Germany
Austria

DIN 1693

GGG40

-

GGG50

GGG60

GGG70

GGG80

-

European

EN 1563

EN-GJS-400-15
EN-GJS-400-18

EN-GJS-450-10

EN-GJS-500-7

EN-GJS-600-3

EN-GJS-700-2

EN-GJS-800-2

EN-GJS-900-2

Japan

JIS G5502

FCD400

FCD450

FCD500

FCD600

FCD700

FCD800

-

Italy

UNI 4544

GS370-17

GS400-12

GS500-7

GS600-2

GS700-2

GS800-2

-

France

NF A32-201

FGS370-17

FGS400-12

FGS500-7

FGS600-2

FGS700-2

FGS800-2

-

UK

BS 2789

400/17

420/12

500/7

600/7

700/2

800/2

900/2

India

IS 1865

SG370/17

SG400/12

SG500/7

SG600/3

SG700/2

SG800/2

-

Spain

UNF

FGE38-17

FGE42-12

FGE50-7

FGE60-2

FGE70-2

FGE80-2

-

Belgium

NBN 830-02

FNG38-17

FNG42-12

FNG50-7

FNG60-2

FNG70-2

FNG80-2

-

Australia

AS 1831

300-17
400-12

-

500-7

600-3

700-2

800-2

-

Sweden

SS 14 07

0717-02

-

0727-02

0732-03

0737-01

0864-03

-

Norway

NS11 301

SJK-400.3
SJK-400

-

SJK-500

SJK-600

SJK-700

SJK-800

 

The Mechanical Properties of SG Iron Material

The following is the microstructure of sg iron. The graphite is existed by spherical shapes. Therefore, the concentration of inside stress is very small, so its mechanical properties are very well. Very high tensile strength, yield strength and elongation. The iron foundries can also control their hardness by controlling their chemical composition.

Because of their excellent mechanical properties, sg cast iron has been widely used worldwide, which is replacing malleable cast iron and cast steel for many types of metal parts.

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