New nichrome
| Alloy grade | Ni | Mn | Cr | Si | C | Fe |
|---|---|---|---|---|---|---|
| Cr20Ni30 OCr20Ni30 | 30.0 - 31.0 | ≤ 6,0 | 19.5 - 21.5 | 1,0 - 1,5 | ≤ 0.6 | base |
| Cr20Ni35 OCr20Ni35 | 34.0 - 37.0 | ≤ 6,0 | 19.5- 21.5 | 1,0 - 1,5 | ≤ 0.6 | base |
| X30H70 OCr30Ni70 | Rest | ≤ 6,0 | 28.0 - 31.0 | 1,0 - 1,5 | ≤ 0.6 | ≤1.00 |
Characteristics of the alloys
| Property | X20H35 | CR20NI30 | CRN70U |
|---|---|---|---|
| Elongation at break (%) | >20 | > 20 | > 20 |
| Tensile strength N/mm2 | 630-780 | 630-780 | 637-784 |
| Density g/cm3 | 7,9 | 7,9 | 8,1 |
| Maximum t° of continuous operation | 1100°C | 1100°C | 1250°C |
| Electrical resistivity (Ωmm2/m) | 1.00 | 1,04 | 1,18 |
| Melting point | 1390°C | 1390°C | 1380°C |
| Linear expansion. Coefficient (αx10-6/°C) | 19 | 19 | 17 |
| Thermal conductivity | 43.7 | 43.7 | 45.2 |
| Lifetime, hours | '4 thou. | '4 thous. | '4 thou. |
