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Grey Iron 4E (Most
Common Grade)
Mechanical Properties
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Imperial |
Metric |
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Tensile Strength |
32-37,000 p.s.i. |
220-260 MPa |
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Hardness Range (Brinell) |
170-220 |
170-220 |
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Compressive Strength |
ca 150,000 p.s.i. |
700-800 MPa |
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Microstructure |
Essentially pearlite. |
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| International Standards |
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American |
ASTM |
A.48 |
Classes 35-40 |
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British |
BS |
1452 |
Grade 17 |
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Australian |
AS |
1830 |
T 250 |
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German |
DIN |
1691 |
GG35 |
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Japanese |
JIS |
FC |
25 |
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| Technological Properties |
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Machinability: |
Excellent. |
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Microfinish: |
Excellent. |
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Resistance to Rust & Acids: |
Very Good. |
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Damping Capacity: |
Very Good. |
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Sliding: |
Excellent. |
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Wear Resistance: |
Good. |
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Enamelling: |
Good. |
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Structure: |
Homogeneous, extremely fine grain.
Oil and pressure-tight.
Free of blowholes & inclusions. |
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Surface: |
Free of sand. |
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