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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 iron（mass 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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