EN-GJL-250
0.6025Grey cast iron with lamellar graphite and minimum tensile strength 250 MPa. The most widely used grey cast iron grade worldwide. Predominantly pearlitic matrix providing an excellent balance of strength, machinability, damping capacity, and castability. Used for engine blocks, cylinder heads, machine tool beds, lathe beds, flywheels, brake discs, hydraulic valve bodies, and general medium-duty structural castings. Equivalent to DIN GG25 and ASTM A48 Class 35.
Chemical composition comparison (wt%)
Side-by-side: EN-GJL-250 (EN) (typical foundry practice) vs ASTM
| Element | EN-GJL-250 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 2.8–3.3% | — | — |
| Si | 1.2–1.7% | — | — |
| Mn | 0.8–1.2% | — | — |
| P | ≤ 0.15% | — | — |
| S | ≤ 0.12% | — | — |
Mechanical properties
As Cast
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 250 | MPa |
| Hardness HB | 180–240 | HB |
| Density | ≥ 7.2 | g/cm3 |
| Thermal Conductivity | ≥ 48.5 | W/mK |
| Elastic Modulus | 103–118 | GPa |
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