EN-GJL-250 Grey Iron

EN-GJL-250 Grey Iron

Flange Component Grey Cast Iron EN-GJL-250 Grade Material Castings Production Product Description and Process Flange Component Grey Cast Iron EN-GJL-250 Grade Material Castings Production Production process: Green sand casting process pre-coated sand casting process resin sand casting process...

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Flange Component Grey Cast Iron EN-GJL-250 Grade Material Castings Production

Product Description and Process

Flange Component Grey Cast Iron EN-GJL-250 Grade Material Castings Production


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 grey 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 is the Microstructure of Grey Cast Iron?

Grey iron has graphite flakes entwined with the rest of the structure. Unhardened grey iron is “fragile” compared to other cast metals.  The graphite flakes create areas of weakness in the metal where fractures can begin that will split the metal.  This propensity to fracture is why grey iron has low tensile and impact strength.  Yet the graphite flakes are what create great wear resistance because as friction occurs the graphite acts as a lubricant.  The graphite structure also has great vibration dampening properties because the structure created by the graphite flakes helps cancel out vibrations.


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


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