Alloy 20CB3
2.4660 – N08020
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Material description
The material 2.4660 is a niobium-stabilised, low-carbon nickel-iron-chromium alloy that is also alloyed with molybdenum and copper.
The material offers excellent resistance in sulphuric and phosphoric acid. In addition, 2.4660 (Alloy 20CB3) has good resistance to chloride-induced stress corrosion cracking, intercrystalline corrosion as well as pitting and crevice corrosion.
In temperature ranges from room temperature up to approx. 500 °C, the material is characterised by good mechanical properties.
AN OVERVIEW OF THE PROPERTIES OF 2.4660:
- Excellent resistance in acids such as sulphuric and phosphoric acid
- Good resistance to chloride-induced stress corrosion cracking
- Good resistance to intergranular corrosion
- Good resistance to pitting and crevice corrosion
Application
- Food industry
- Pharmaceutical industry
- Amino and sulphuric acid production
- Production of (synthetic) plastics
Chemical composition in %
| ASTM B473 | DIN 17744 | |
|---|---|---|
| C, max. | 0,07 | 0,07 |
| Mn, max. | 2,00 | 2,0 |
| P, max. | 0,045 | 0,025 |
| S, max. | 0,035 | 0,015 |
| Si, max. | 1,00 | 1,00 |
| Ni | 32,00 – 38,00 | 32,00 – 38,00 |
| Cr | 19,00 – 21,00 | 19,00 – 21,00 |
| Mo | 2,00 – 3,00 | 2,0 – 3,0 |
| Cu | 3,00 – 4,00 | 3,0 – 4,0 |
| Nb + Ta | 8 x C – 1,00 | 8 x C – 1,00 |
| Fe | Rest | Rest |
| Co, max. | 1,5 |
Mechanical properties
| Annealed | Bar | Bar D ≤ 90 DIN 17752 |
|---|---|---|
| Rm (MPa) | ≥ 551 | ≥ 550 |
| Rp 0,2 (MPa) | ≥ 241 | ≥ 240 |
| Rp 1,0 (MPa) | ≥ 270 | |
| A (%) | ≥ 30 | ≥ 40 |
| Z (%) | ≥ 50 |
The specified values are non-binding guide values.