Grey Iron Casting Process

Grey Iron Casting Process

Housing Castings Grey Iron Casting Process For Small Castings And large Castings Product Description and Process Housing Castings Grey Iron Casting Process For Small Castings And large Castings Production process: green sand casting process pre-coated sand casting process resin sand casting...

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Housing Castings Grey Iron Casting Process For Small Castings And large Castings

Product Description and Process

Housing Castings Grey Iron Casting Process For Small Castings And large Castings


Production process:

green sand casting process

pre-coated sand casting process

resin sand casting process

Weight range: from 50 gram to 2,000 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.


Gray/Grey Iron Classifications

In theUnited States, the most commonly used classification for gray iron is ASTM International standard A48.

This orders gray iron into classes which corresponds with its minimum tensile strength in thousands of pounds per square inch (ksi); e.g. class 20 gray irons has a minimum tensile strength of 20,000 psi (140 MPa). Class 20 has a high carbon equivalent and a ferrite matrix. Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. Gray iron above class 40 requires alloying to provide solid solution strengthening, and heat treating is used to modify the matrix. Class 80 is the highest class available, but it is extremely brittle.

ASTM A247 is also commonly used to describe the graphite structure. Other ASTM standards that deal with gray iron include ASTM A126, ASTM A278, and ASTM A319.

In the automotive industry, the SAE International (SAE) standard SAE J431 is used to designate grades instead of classes. These grades are a measure of the tensile strength-to-Brinell hardness ratio.

The variation of the tensile modulus of elasticity of the various grades is a reflection of the percentage of graphite in the material as such material has neither strength nor stiffness and the space occupied by graphite acts like a void, thereby creating a spongy material.


Properties of ASTM A48 classes of gray iron

Class

Tensile
strength (ksi)

Compressive
strength (ksi)

Tensile modulus
E (Mpsi)

20

22

83

10

30

31

109

14

40

57

140

18

60

62.5

187.5

21


Properties of SAE J431 grades of gray iron

Grade

Brinell hardness

t/h†

Description

G1800

120–187

135

Ferritic-pearlitic

G2500

170–229

135

Pearlitic-ferritic

G3000

187–241

150

Pearlitic

G3500

207–255

165

Pearlitic

G4000

217–269

175

Pearlitic

†t/h = tensile strength/hardness


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