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ASTM A48 - 2000 / ASTM A159 - 1993 / ASTM A319 - 1995

This standard is for gray iron castings used for general engineering use where tensile strength is a major consideration. Casting degrees are classified on the basis of the tensile strength of the cast test bars. This standard also provides the chemical composition and physical properties for motor vehicles.

According the minimum tensile strength obtained by test bars, designers could choose the suitable gray iron degrees. The following information is from ASTM.

Alternative Standards:
GB/T 9439-1998
NF A32-101(1997)/NF EN 1561:1997
DIN 1691-1985
ISO 185:1988
JIS G5501(1995)
KS D4301-1985
ГOCT 1412-1985
BS 1452-1990

ASTM A48 Gray Iron Degree and Tensile Strength

Degree/Grade

Test Bar Strength
Min. Mpa

Test Bar Diameter
d/mm

ANSI / ASTM

UNS

No.20A
No.20B
No.20C
No.20S

F11401

138

22.4
30.5
50.8
S Bar

No.25A
No.25B
No.25C
No.25S

F11701

172

22.4
30.5
50.8
S Bar

No.30A
No.30B
No.30C
No.30S

F12101

207

22.4
30.5
50.8
S Bar

No.35A
No.35B
No.35C
No.35S

F12401

241

22.4
30.5
50.8
S Bar

No.40A
No.40B
No.40C
No.40S

F12801

276

22.4
30.5
50.8
S Bar

No.45A
No.45B
No.45C
No.45S

F13101

310

22.4
30.5
50.8
S Bar

No.50A
No.50B
No.50C
No.50S

F13501

345

22.4
30.5
50.8
S Bar

No.55A
No.55B
No.55C
No.55S

F13801

379

22.4
30.5
50.8
S Bar

No.60A
No.60B
No.60C
No.60S

F14101

414

22.4
30.5
50.8
S Bar

 ASTM A48 Gray Iron Degree and Chemical Composition for Motor Vehicles

Degree/Grade

C %

Si %

Mn %

P %

S %

CE

ASTM

UNS

G1800

F10004

3.40~3.70

2.30~2.80

0.50~0.80

0.25

0.15

4.25~4.5

G2500

F10005

3.20~3.50

2.00~2.40

0.60~0.90

0.20

0.15

4.0~4.25

G2500a

F10009

≤3.40

1.60~2.10

0.60~0.90

0.15

0.12

G3000

F10006

3.10~3.40

1.90~2.30

0.60~0.90

0.15

0.15

3.9~4.15

G3500

F10007

3.00~3.30

1.80~2.20

0.60~0.90

0.12

0.15

3.7~3.9

G3500b

F10010

≤3.40

1.30~1.80

0.60~0.90

0.15

0.12

G3500c

F10011

≤3.50

1.30~1.80

0.60~0.90

0.15

0.12

G4000

F10008

3.00~3.30

1.80~2.10

0.70~1.00

0.10

0.15

3.7~3.9

G4000d

F10012

3.10~3.60

1.95~2.40

0.60~0.90

0.10

0.15

(+Cr, +Mo)

 ASTM A48 Gray Iron Physical Properties for Motor Vehicles

Degree/Grade

Tensile Strength
σb≥/Mpa

Yield Strength
σbb≥/Mpa

Elongation
f ≥ / mm

Hardness
HBS

Impression Diameter
mm

G1800

137

NO

3.6

143~187

5.0~4.4

G2500, G2500a

172

NO

4.3

170~229

4.6~4.0

G3000

206

NO

5.1

187~241

4.4~3.9

G3500, G3500b,
G3500c

240

NO

6.1

207~255

4.2~3.8

G4000, G4000d

275

NO

6.9

217~269

4.1~3.7

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