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  China GB 9439 HT300 Gray Cast Iron  
 

GB 9439 HT300 Gray Cast Iron is suitable for manufacturing castings with high bending stress and high air tightness.

This material grade is good for heavy machine beds, gears, large engine crankshafts and cylinder bodies, high pressure cylinders, rolling mill blocks, etc.

The example of Chemical analysis of GB 9439 HT300 Grey Cast Iron(mass fraction)(%)

Grade

Thickness
/mm

C

Si

Mn

P

S

HT300

<30
30~50
>50

2.9~3.2
2.9~3.2
2.8~3.1

1.4~1.7
1.2~1.5
1.1~1.4

0.8~1.0
0.9~1.1
1.0~1.2

0.15
0.15
0.15

0.10
0.10
0.10

Please notice, the chemical composition can not be taken as material quality inspection standard. In all standards, the chemical composition is just for reference. The grey iron foundries could adjust their composition according to their own production condition and experience, as long as they could guarantee to meet the mechanical properties, which is the only inspection standard.

Mechanical properties of separately cast samples (30 mm diameter) of GB 9439 HT300 Gray Cast Iron

Mechanical properties

Material No.

HT-300

Tensile strength Rm/Mpa

300-400

Proof stress Rp0.1/MPa

195-260

Elongation at fracture A/%

0.3-0.8

Compression strength δdb /MPa

960

Compression yield point δd0.1/MPa

390

Bending strength δdB/MPa

390

Shear strength δaB/MPa

345

Torsional strength TtB/MPa

345

Modulus of Elasticity E/(k MPa)

108-137

Poisson ratio μ

0.26

Bending fatigue strength δbW/MPa

140

Fatigue limit under reversed tension-compression stresses δzdW/MPa

75

Fracture toughness KIC/MPa3/4

560

GB 9439 HT300 Grey Iron Castings Hardness:

Grey iron grade

Hardness grade

Hardness Range HBS

Metallography

HT300

H235

210~260

Pearlite(Inoculated Cast Iron)

China GB 9439 HT300 Equivalent Grades:

Country

Standard

Material Grade


ISO

ISO 185

GRADE300


USA

ASTM A48

CLASS 40, CLASS 45


Germany / Austria

DIN 1691

GG30


European

EN 1561

EN-GJL-300


Japan

JIS G5501

FC300


Italy

UNI 5007

G30


France

NF A32-101

FGL300


UK

BS 1452

300


Spain

UNF

FG30


Belgium

NBN 830-01

FGG30


Australia

AS 1830

T300


Sweden

SS 14 01

O130


Norway

NS11 100

SJG300

 

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