EN-GJS-400-15
5.3106Ferritic ductile (spheroidal graphite) cast iron with minimum tensile strength 400 MPa and minimum elongation 15%. The most widely used ductile iron grade worldwide. Spheroidal graphite morphology achieved by magnesium treatment provides far superior ductility and impact resistance compared to grey iron. Used for water and gas pipes, valve bodies, pump housings, automotive components, gearbox housings, and general engineering castings. Equivalent to DIN GGG40, ASTM A536 60-40-18, JIS FCD400.
Chemical composition comparison (wt%)
Side-by-side: EN-GJS-400-15 (EN) (typical foundry practice) vs ASTM
| Element | EN-GJS-400-15 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 3.2–3.8% | — | — |
| Si | 2.2–2.8% | — | — |
| Mn | 0.1–0.3% | — | — |
| P | ≤ 0.05% | — | — |
| S | ≤ 0.02% | — | — |
| Mg | 0.03–0.06% | — | — |
Mechanical properties
As Cast
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 400 | MPa |
| Yield Strength | ≥ 250 | MPa |
| Elongation | ≥ 15 | % |
| Density | ≥ 7.1 | g/cm3 |
| Elastic Modulus | ≥ 169 | GPa |
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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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