GG25 is the most commonly used cast iron alloy. This material offers a good combination of strength and abrasion resistance, but is still easy to machine and can be finished to a high standard. It is a lamellar cast iron with a predominantly pearlitic structure. Heat treatment to increase hardness is not recommended.
GG25 is similar to GG20, but – due to the slightly finer structure – offers a higher tensile strength. This makes it suitable for machine components that are subjected to higher mechanical stresses.
Standards / designations
| EN 1561 SYM (EU) | EN-GJL-250 | ||
|---|---|---|---|
| EN 1561 NR (EU) | EN-JL1040 | ||
| DIN 1691 (DE) | GG25 | ||
| WERKSTOFFNUMMER (DE) | 0.6025 | ||
| ASTM A48 (US) | 40 B | ||
| ALT | GG 25, GG-25 | ||
Mechanical properties
| Tensile strength | σ B | 250 | [N/mm2] |
|---|---|---|---|
| Elongation | A | 0.3-0.8 | [%] |
| Permanent limit of elongation | σ bB | 450 | [N/mm2] |
| Compressive strength | σ dB | 950 | [N/mm2] |
| Brinell hardness | HB30 | 180-240 | [Kg/mm2] |
| Elasticity modulus | Eo | 110 | [kN/mm2] |
| Shear stress | σaB | 290 | [N/mm2] |
Chemical composition
| Carbon | C | 2.9-3.65 | [%] |
|---|---|---|---|
| Silicon | Si | 1.8-2.9 | [%] |
| Manganese | Mn | 0.5-0.7 | [%] |
| Sulphure | S | 0.10 max. | [%] |
| Phosphorus | P | 0.30 max. | [%] |
| Iron | Fe | Remainder | |
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