Grey Cast Iron Grades

Grey Cast Iron Grades

Grey Cast Iron Grades HT150 HT200 HT250 Castings Production Supply Bearing Bracket Product Description and Process Grey Cast Iron Grades HT150 HT200 HT250 Castings Production Supply Bearing Bracket Production process: green sand casting process pre-coated sand casting process resin sand casting...

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Grey Cast Iron Grades HT150 HT200 HT250 Castings Production Supply Bearing Bracket  

Product Description and Process

Grey Cast Iron Grades HT150 HT200 HT250 Castings Production Supply Bearing Bracket 


Production process:

green sand casting process

pre-coated sand casting process

resin sand casting process

Weight range: from 50 gram to 5,000 kilograms for ductile iron casting product


Machining process:

CNC machine, machining center, lathe, mill machine, drill machine, etc.


Surface treatment process:

paint coating, electrophoretic paint coating, electrogalvanizing coating, black oxide coating, phosphate treatment,  powder coating, etc.


Product Material and Uses

Normally production with gray iron HT200, HT250, ductile iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, 100-70-03, etc.

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, etc.


What are the Material Properties vs. Casting Processes?

Material properties come from the makeup of the materials present.  Some of the materials are added to the iron for strength while others are added to improve castability (affecting melting temperatures, etc.).  The properties of all metals are also influenced by the way they solidify during cooling.   If you change the cooling process, you automatically change the structure of the metal in its final state.  How the cast part cools can be affected by how the metal is introduced into the mold, the pouring temperature, and the process and speed of cooling.  One of the difficulties in making a quality casting is to account for the way a part will cool in different parts of the mold, accounting for both thick and thin areas of the mold.


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 Family

Gray

Ductile

CGI

Malleable

White

Carbon

2.5-4.2

3.0-4.0

2.5-4.0

2.2-2.8

1.8-3.6

Silicon

1.0-3.0

1.8-3.0

1.5-3.0

1.2-1.9

0.5-2.0

Manganese

0.15-1.0

0.1-1.0

0.10-1.0

0.15-1.2

0.15-0.8

Sulfur

0.02-0.25

0.01-0.03

0.01-0.03

0.02-0.2

0.02-0.2

Phosphorus

0.02-1.0

0.01-0.1

0.01-0.1

0.02-0.2

0.02-0.2


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

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


Grey Iron Castings Hardness

Gray Iron Grade

Hardness Grade

Hardness Range

HB

Metallography

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)


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