GG20 offers exceptional machinability and is extremely resistant to heat and corrosion. This material is also easy to finish and extremely effective at damping both sound and vibration. The strength and abrasion resistance of this material are limited.
GG20 is used for all types of machine parts that are not subjected to high mechanical stresses. For example, it is ideal for fire grate bars in old steam locomotives and for grate bars in steam-powered boats. GG20 is used for street furniture such as balustrades and bridge lamp posts, but also for ingot casting moulds in the gold and silver industry.
Standards / designations
| EN 1561 SYM (EU) | EN-GJL-200 | ||
|---|---|---|---|
| EN 1561 NR (EU) | EN-JL1030 | ||
| DIN 1691 (DE) | GG20 | ||
| WERKSTOFFNUMMER (DE) | 0.6020 | ||
| ASTM A48 (US) | 30 B | ||
| ALT | GG 20, GG-20 | ||
Mechanical properties
| Tensile strength | σ B | 200 | [N/mm2] |
|---|---|---|---|
| Elongation | A | 0.3-0.8 | [%] |
| Permanent limit of elongation | σ bB | 400 | [N/mm2] |
| Compressive strength | σ dB | 800 | [N/mm2] |
| Brinell hardness | HB30 | 170-210 | [Kg/mm2] |
| Elasticity modulus | Eo | 100 | [kN/mm2] |
| Shear stress | σaB | 230 | [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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