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GB T 9439 - 1998 Standard for Grey Cast Iron

This is a Chinese standard for stipulating the physical properties of grey cast iron, or called as gray iron. This standard is similar with the other standards for grey iron such as ASTM A48 in USA, DIN 1691 in Germany and ISO 185. The following is the main content of GB/T 9439-1998 standard for your reference.

Tensile strength of cast integral test bar and castings
Grade
 Cast integral test bar
Tensile strength
σb≥/Mpa
castings
Thickness
/mm
Tensile strength
σb≥/Mpa
HT100
100
>2.5~10
>10~20
>20~30
>30~40
130
100
90
80
HT150
150
>2.5~10
>10~20
>20~30
>30~40
175
145
130
120
HT200
200
>2.5~10
>10~20
>20~30
>30~40
220
195
170
160
HT250
250
>4.0~10
>10~20
>20~30
>30~50
270
240
220
200
HT300
300
>10~20
>20~30
>30~50
290
250
230
HT350
350
>10~20
>20~30
>30~50
340
290
260
 
Tensile strength of attached test bar or block
Grade
Thickness
/mm
Tensile strength  σb≥/Mpa
Casting(parameter)
Tensile strength
σb≥/Mpa
Attached test bar
Attached test block
φ30mm
φ50mm
R15mm
R25mm
HT150
>20~40
>40~80
>80~150
>150~300
130
115
-
-
-
(115)
105
100
120
110
-
-
-
-
100
90
120
105
90
80
HT200
>20~40
>40~80
>80~150
>150~300
180
160
-
-
-
(155)
145
135
170
150
-
-
-
-
140
130
165
145
130
120
HT250
>20~40
>40~80
>80~150
>150~300
220
200
-
-
-
(190)
180
165
(210)
190
-
-
-
-
170
160
205
180
165
150
HT300
>20~40
>40~80
>80~150
>150~300
260
235
-
-
-
(230)
210
195
(250)
225
-
-
-
-
200
185
245
215
195
180
HT350
>20~40
>40~80
>80~150
>150~300
300
270
-
-
-
(265)
240
215
(290)
260
-
-
-
-
230
210
285
255
225
205
 
Other mechanical properties of Grey cast iron
Grade
Tensile strength
σbc/MPa
Shearing strength
τb/MPa
Impact toughness
αKV/(J/cm2)
Fatigue limit
σ-1/MPa
elastic modulo
Ε/GPa
HT150
500~700
150~250
-
60~90
70~90
HT200
600~800
200~300
2~5
80~90
80~110
HT250
800~1000
250~350
4~8
100~140
100~130
HT300
1000~1200
300~450
7~10
120~160
120~140
HT350
1100~1300
350~500
9~11
140~180
130~160
 
The hardness grade and range of Grey cast iron
Grade
Hardness grade
Hardness range of casting
HBS
Relevant microstructure
HT100
H145
≤170
ferrite
HT150
H175
150~200
ferrite+pearlite
HT200
H195
170~220
pearlite
HT250
H215
190~240
pearlite
HT300
H235
210~260
pearlite(inoculated cast iron)
HT350
H255
230~280
pearlite(inoculated cast iron)
 
The example of Chemical analysis of Grey cast ironmass fraction)(%)
Grade
Thickness
/mm
C
Si
Mn
P
S
HT100
-
3.4~3.9
2.1~2.6
0.5~0.8
0.3
0.15
HT150
<30
30~50
>50
3.3~3.5
3.2~3.5
3.2~3.5
2.0~2.4
1.9~2.3
1.8~2.2
0.5~0.8
0.5~0.8
0.6~0.9
0.2
0.2
0.2
0.12
0.12
0.12
HT200
<30
30~50
>50
3.2~3.5
3.1~3.4
3.0~3.3
1.6~2.0
1.5~1.8
1.4~1.6
1.7~0.9
0.8~1.0
0.8~1.0
0.15
0.15
0.15
0.12
0.12
0.12
HT250
<30
30~50
>50
3.0~3.3
2.9~3.2
2.8~3.1
1.4~1.7
1.3~1.6
1.2~1.5
0.8~1.0
0.9~1.1
1.0~1.2
0.15
0.15
0.15
0.12
0.12
0.12
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

 

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