July 30, 2010

Grey Cast Iron Property and Chemistry in GB/T9439

Grey Cast Iron (Gray iron castings) is so called because of the color of the fracture face. It contains 1.5-4.3% carbon and 0.3-5% silicon plus manganese, sulfur and phosphorus. It is brittle with low tensile strength, but is easy to cast.

The all data in this documents is referred to Chinese standard of GB/T 9439-1988. Qingdao Casting Quality write all materials from handbook.

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    Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.

  2. Investment Casting

    also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance

  3. Shell Casting

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Grey Cast Iron Property

Single Casting Specimen Tensile Strength Property for grey cast iron

Gray Iron GradeSingle Specimen

Tensile Strength
σb≥/Mpa

Gray iron Castings
Wall Thickness
/mm
Tensile Strength
σb≥/Mpa
HT100100>2.5~10
>10~20
>20~30
>30~40
130
100
90
80
HT150150>2.5~10
>10~20
>20~30
>30~40
175
145
130
120
HT200200>2.5~10
>10~20
>20~30
>30~40
220
195
170
160
HT250250>4.0~10
>10~20
>20~30
>30~50
270
240
220
200
HT300300>10~20
>20~30
>30~50
290
250
230
HT350350>10~20
>20~30
>30~50
340
290
260

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Castings Attached Specimen Tensile Strength Property

Gray Iron GradeWall Thickness
/mm
Tensile Strength σb≥/MpaTensile Strength (reference)

σb≥/Mpa

Attached Test CouponAttached Test Block
φ30mmφ50mmR15mmR25mm
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

Grey Iron Castings’ other  mechanical property

GradeCompressive Strength
σbc/MPa
Shearing Strength
τb/Mpa
Impact Testing
αKV/(J/cm2)
Safe Range of stress
σ-1/MPa
Modulus of Elasticity
Ε/GPa
HT150500~700150~25060~9070~90
HT200600~800200~3002~580~9080~110
HT250800~1000250~3504~8100~140100~130
HT3001000~1200300~4507~10120~160120~140
HT3501100~1300350~5009~11140~180130~160

Grey Iron Castings Hardness

Gray Iron GradeHardness GradeHardness Range
HBS
Metallography
HT100H145≤170Ferrite
HT150H175150~200Ferrite + Pearlite
HT200H195170~220Pearlite
HT250H215190~240Pearlite
HT300H235210~260Pearlite(Inoculated Cast Iron)
HT350H255230~280Pearlite(Inoculated Cast Iron)

Gray Iron Casting heat treatment

Casting Unit Weight
kg
Starting Temperature
/οC
Heating Speed
/(οC/h)
Preservation Temperature/οCHeat Preservation Time
/h
Cooling Speed
/(οC/h)
Final Temperature
/οC
Cast IronLow Alloy Cast Iron
Simple Castings
<200≤200≤100500~550550~5704~630200
200~2500≤200≤80500~550550~5706~830200
>2500≤200≤60500~550550~570830200
Precision Castings
<200≤200≤100500~550550~5704~620200
200~2500≤200≤80500~550550~5706~820200

Gray Iron Casting, no any standard mentioned the chemistry composition, so we only suggest the following chemistry based on actual production.

 

GradeWall Thickness
/mm
CSiMnP
S
HT1003.4~3.92.1~2.60.5~0.80.30.15
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

Grey Cast Iron Compare

IndexCountryGrey Iron Grade
1ChinaHT350HT300HT250HT200HT150HT100
2JapaneseFC350FC300FC250FC200FC150FC100
3USANO.60NO.50NO.45NO.35/ NO.40NO.30NO.25NO.20
4RussiaCЧ40CЧ35CЧ30CЧ24/CЧ25CЧ18/CЧ20/CЧ21CЧ15CЧ10
5GermanyGG40GG35GG30GG25GG20GG15GG10
6ItalyG35G30G25G20G15G10
7FranceFGL400FGL350FGL300FGL250FGL200FGL150
8England400350300260180/220150100
9PolandZ140Z135Z130Z125Z120Z115
10IndiaFG400FG350FG300FG260FG200FG150
11RomaniaFC400FC350FC300FC250FC200FC150
12SpanishFG35FG30FG25FG20FG15
13BelgiumFGG40FGG35FGG30FGG25FGG20FGG15FGG10
14AustraliaT400T350T300T260T220T150
15SwedenO140O135O130O125O120O115O110
16HungaryOV40OV35OV30OV25OV20OV15
17BulgariaVch35Vch30Vch25Vch20Vch15
18ISO350300250200150100
19COPANTFG400FG350FG300FG250FG200FG150FG100
20Taiwan(China)FC300FC250FC200FC150FC100
21HollandGG35GG30GG25GG20GG15
22LuxemburgFGG40FGG35FGG30FGG25FGG20FGG15
23AustriaGG35GG30GG25GG20GG15
24Europa-NormEN-GJL-350EN-GJL-300EN-GJL-250EN-GJL-200EN-GJL-150

Grey Iron Castings

Grey Cast Iron

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