EN-GJL-300
0.6030Grey cast iron with lamellar graphite and minimum tensile strength 300 MPa. Fully pearlitic matrix with higher strength than EN-GJL-250 but slightly reduced machinability and damping. Used for cylinder liners, heavy-duty machine beds, hydraulic cylinders, gearbox housings, large flywheels, and structural castings requiring higher strength. Equivalent to DIN GG30 and ASTM A48 Class 45.
Chemical composition comparison (wt%)
Side-by-side: EN-GJL-300 (EN) (typical foundry practice) vs ASTM
| Element | EN-GJL-300 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 2.6–3% | — | — |
| Si | 1.1–1.5% | — | — |
| Mn | 0.8–1.2% | — | — |
| P | ≤ 0.15% | — | — |
| S | ≤ 0.12% | — | — |
Mechanical properties
As Cast
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 300 | MPa |
| Hardness HB | 195–260 | HB |
| Density | ≥ 7.25 | g/cm3 |
| Thermal Conductivity | ≥ 47.5 | W/mK |
| Elastic Modulus | 108–137 | GPa |
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