EN-GJS-900-2
5.3302Ultra-high-strength ductile cast iron with minimum tensile strength 900 MPa and minimum elongation 2%. The highest strength grade in EN 1563 for conventional (non-ADI) ductile iron. Always requires heat treatment (normalizing + tempering or quenching + tempering). Very high yield strength of 600 MPa minimum. Used for the most demanding ductile iron applications: heavy-duty gears, high-performance crankshafts, and structural components replacing steel forgings.
Chemical composition comparison (wt%)
Side-by-side: EN-GJS-900-2 (EN) (typical foundry practice) vs ASTM
| Element | EN-GJS-900-2 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 3–3.5% | — | — |
| Si | 1.8–2.4% | — | — |
| Mn | 0.3–0.7% | — | — |
| P | ≤ 0.05% | — | — |
| S | ≤ 0.02% | — | — |
| Ni | ≤ 1% | — | — |
| Cu | 0.5–1.5% | — | — |
| Mg | 0.03–0.06% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 900 | MPa |
| Yield Strength | ≥ 600 | MPa |
| Elongation | ≥ 2 | % |
| Density | ≥ 7.1 | g/cm3 |
| Elastic Modulus | ≥ 176 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 880–920 °C | air | — | Austenitizing + air cool |
| tempering | 550–620 °C | air | — | Temper to desired hardness |
Related materials
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EN-GJS-500-7
5.3200Ferritic-pearlitic ductile cast iron with minimum tensile strength 500 MPa and minimum elongation 7%. The balanced grade offering significantly higher strength than EN-GJS-400-15 while retaining reasonable ductility. Mixed ferrite-pearlite matrix (typically 40-50% pearlite). Used for crankshafts, connecting rods, suspension components, gear housings, heavy-duty pipe fittings, and medium-stress structural castings. Equivalent to DIN GGG50, JIS FCD500.
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