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ASTM A48 Class 30 Gray Iron Sand Castings Process Shell Mould Castings

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ASTM A48 Class 30 Gray Iron Sand Castings Process Shell Mould Castings

Country/Region china
City & Province zhengzhou henan
Categories Glass Furniture

Product Details

ASTM A48 Class 30 Gray Iron Sand Castings Process Shell Mould Castings

 

 

Product Description and Process

 

1. Grey Cast Iron ASTM A48 Class30 Sand Castings Process Shell Mould Castings

 

2. Production process: green sand molding, pre-coated sand molding and resin sand molding which can produce iron castings from 50 gram to 2000 kilograms

 

3. Machining process: CNC machine, machining center, lathe, mill machine, drill machine, etc.

 

4. Surface treatment process: paint coating, electrophoretic coating, electrogalvanizing coating, black oxide coating, phosphate coating, powder coating, etc.

 

Product Material and Uses

 

1. Normally produce with gray iron HT200, HT250, Ductile Iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, etc.

2. The ductile iron casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, valves and pump parts, etc.

 

 

 

Properties of ASTM A48 classes of gray iron

 

ClassTensile
strength (ksi)
Compressive
strength (ksi)
Tensile modulus,
E (Mpsi)
20228310
303110914
405714018
6062.5187.521

 

 

Properties of SAE J431 grades of gray iron

 

GradeBrinell hardnesst/h†Description
G1800120–187135Ferritic-pearlitic
G2500170–229135Pearlitic-ferritic
G3000187–241150Pearlitic
G3500207–255165Pearlitic
G4000217–269175Pearlitic
†t/h = tensile strength/hardness

 

 

 

 

 

 

What is the Composition of Gray Cast Iron?

 

Just like all cast iron parts, the primary component of Grey Iron is going to be the iron (no surprise there, right?). Just like most other cast irons, it also has 2.5–4.0% carbon and 1–3% silicon. If you look at Chart 2 you will notice that the composition of the iron is very close to other common cast parts, but with a little more phosphorus.

 

Iron FamilyGrayDuctileCGIMalleableWhite
Carbon2.5-4.23.0-4.02.5-4.02.2-2.81.8-3.6
Silicon1.0-3.01.8-3.01.5-3.01.2-1.90.5-2.0
Manganese0.15-1.00.1-1.00.10-1.00.15-1.20.15-0.8
Sulfur0.02-0.250.01-0.030.01-0.030.02-0.20.02-0.2
Phosphorus0.02-1.00.01-0.10.01-0.10.02-0.20.02-0.2

 

Grey Cast Iron Property and Chemical Composition

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

 

Grade

Wall Thickness

/mm

CSiMn

P

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

 

Single Casting Specimen Tensile Strength Property

 

Gray Iron Grade

Single 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

 

 

 

Grey Iron Castings’ other mechanical property

 

Grade

Compressive 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 Grade

Hardness Range

HB

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

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