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Grey Iron Grades

There are many different grey iron grades in different countries and standards, however, most of grades have same requirements to the mechanical properties, especially to tensile strength. The followings are the main grey cast iron grades worldwide.

Country

Standard

Equivalent Grades of Grey Iron (Gray Cast Iron)

ISO

ISO 185

100

150

200

250

300

350

-

China

GB 9439

HT100

HT150

HT200

HT250

HT300

HT350

-

USA

ASTM A48

-

NO.20
NO.25

NO.30

NO.35

NO.40
NO.45

NO.50

NO.55
NO.60

Germany
Austria

DIN 1691

GG10

GG15

GG20

GG25

GG30

GG35

GG40

European

EN 1561

EN-GJL-100

EN-GJL-150

EN-GJL-200

EN-GJL-250

EN-GJL-300

EN-GJL-350

 

Japan

JIS G5501

FC100

FC150

FC200

FC250

FC300

FC350

-

Italy

UNI 5007

G10

G15

G20

G25

G30

G35

-

France

NF A32-101

-

FGL150

FGL200

FGL250

FGL300

FGL350

FGL400

UK

BS 1452

100

150

200

250

300

350

-

India

IS 210

-

FG150

FG200

FG260

FG300

FG350

FG400

Spain

UNF

-

FG15

FG20

FG25

FG30

FG35

-

Belgium

NBN 830-01

FGG10

FGG15

FGG20

FGG25

FGG30

FGG35

FGG40

Australia

AS 1830

-

T150

T220

T260

T300

T350

T400

Sweden

SS 14 01

O110

O115

O120

O125

O130

O135

O140

Norway

NS11 100

SJG100

SJG150

SJG200

SJG250

SJG300

SJG350

-

Min. Tensile Strength (Mpa)

100

150

200

250

300

350

-

The Mechanical Properties of Grey Iron Material

The following is the microstructure of grey iron. The graphite is existed by flake shapes. Therefore, the stress will be concentrated at the end position of graphite. So, its tensile strength is small, and almost no yield strength and elongation properties.

If the customers have special requirements to the hardness, then the iron foundries could meet the requirements by adjusting their chemical composition. Otherwise, the tensile strength will be the only yard to judge the mechanical properties.

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