K500/NA 18
2.4375 – N05500
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Material description
Material 2.4375 is a precipitation-hardening nickel-copper alloy which also contains titanium and aluminium. The alloy is corrosion-resistant and offers good mechanical strengths and an extremely high resistance to chloride-induced stress corrosion. 2.4375 (Alloy K 500/NA 18) is also non-magnetisable even at low temperatures.
An overview of the properties of 2.4375:
- High resistance to corrosion
- Extremely good mechanical properties
- Extremely good resistance to chloride-induced stress corrosion
- Non-magnetisable at low temperatures
- Resistant to seawater
Applications
- Oil and gas production
- Chemical and petrochemical industry
- Shipbuilding
- Seawater and saltwater facilities
- Flight instrument parts
Chemical composition in %
| ASTM B865 | BS 3076 | DIN 17743 | |
|---|---|---|---|
| Ni, min. | 63.0 | Ni + Co, min. 63.0 | Ni + Co, min. 63 |
| Al | 2.30 – 3.15 | 2.3 – 3.2 | 2.2 – 3.5 |
| C, max. | 0.18 | 0.25 | 0.2 |
| Fe, max. | 2.0 | 2.0 | 0.5 – 2.0 |
| Mn, max. | 1.5 | 1.5 | 1.5 |
| Si, max. | 0.50 | 0.5 | 0.5 |
| Ti | 0.35 – 0.85 | 0.35 – 0.85 | 0.3 – 1.0 |
| S, max. | 0.010 | 0.01 | 0.015 |
| Cu | 27.0 – 33.0 | 27.0 – 33.0 | 27 – 34 |
Mechanical properties
| Precipitation-hardened | Bar D ≤ 108mm | D > 108mm | Bar/forging D ≤ 110mm | 110mm < D ≤ 300mm | |
|---|---|---|---|
| Rm (MPa) | ≥ 965 | ≥ 965 | ≥ 970 | ≥ 830 | |
| Rp 0.2 (MPa) | ≥ 690 | ≥ 690 | ≥ 690 | ≥ 550 | |
| A (%) | ≥ 20 | ≥ 17 | ≥ 15 | |
| Hardness (Brinell 3000) | ≥ 265 (for info) |
The specified values are non-binding guide values.
| solution annealed | Bar 30 mm ≤ D ≤ 160 mm DIN 17752 | ||
|---|---|---|---|
| Rm (MPa) | ≥ 620 | ||
| Rp 0.2 (MPa) | ≥ 270 | ||
| Rp 1.0 (MPa) | ≥ 300 | ||
| A (%) | ≥ 25 | ||
| Hardness (HBW 2.5/62.5) | ≤ 180 |
| solution annealed + precipitation-hardened | Bar/forging D ≥ 25.4 mm | Bar/forging 25 mm < D ≤ 110 mm | 110 mm < D ≤ 300 mm | Bar 30 mm ≤ D ≤ 160 mm DIN 17752 |
|---|---|---|---|
| Rm (MPa) | ≥ 895 | ≥ 900 | ≥ 830 | ≥ 880 |
| Rp 0.2 (MPa) | ≥ 585 | ≥ 585 | ≥ 500 | ≥ 590 |
| A (%) | ≥ 20 | ≥ 20 | ≥ 15 | ≥ 15 |
| Hardness (Brinell 3000) | ≥ 250 (for info) |
The specified values are non-binding guide values.