This Nickel-Chromium-Molybdenum alloy tolerates high temperatures and gives a design freedom in areas where weld geometry makes excessive heat build-up unavoidable. Resistance to general and localised corrosion and stress corrosion cracking is generally similar to Hastelloy C-276.
Hastelloy C-4 is also known as Nicrofer 6616.
| Element | Min % | Max % |
| Cr | 14.00 | 18.00 |
| Mo | 14.00 | 17.00 |
| Fe | – | 3.00 |
| C | – | 0.015 |
| Si | – | 0.08 |
| Co | – | 2.00 |
| Mn | – | 1.00 |
| P | – | 0.04 |
| S | – | 0.03 |
| Ti | – | 0.70 |
| Ni | Bal | |
Density
8.64 g/cm³ | 0.312 lb/in³
Melting Point
1399°C | 2550°F
Coefficient of Expansion
10.8 μm/m °C (20 – 100°C) | 6.0 x 10-6 in/in °F (70 – 212°F)
Modulus of Rigidity
81.2 kN/mm² | 11777 ksi
Modulus of Elasticity
212.4 kN/mm² | 30807 ksi
Heat Treatment of Finished Parts
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Annealed or Spring Temper | Stress Relieve | 400 – 450 | 750 – 840 | 2 | Air |
Properties
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 800 – 1100 | 116 – 159 | -200 to +400 | -330 to +750 |
| Spring Temper | 1300 – 1700 | 189 – 247 | -200 to +400 | -330 to +750 |