Hastelloy C4：Corrosion Resistance Metal Material in Chemical Processing
2024-12-20
Hastelloy C4 (UNS N06455) is a wrought nickel-chromium-molybdenum alloy. It has high corrosion resistance. This alloy is particularly valuable in industries where metal materials are exposed to harsh environments, such as chemical processing, aerospace.
Chemical Composition
The chemical composition of Hastelloy C4 is a critical factor that contributes to its unique properties. The alloy primarily consists of nickel, chromium, and molybdenum, with trace amounts of other elements that enhance its performance.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 14-18 |
| Molybdenum, Mo | 14-17 |
| Iron, Fe | 3 max |
| Cobalt, Co | 2 max |
| Manganese, Mn | 1 max |
| Titanium, Ti | 0.7 max |
| Silicon, Si | 0.08 max |
| Phosphorus, P | 0.04 max |
| Sulfur, S | 0.03 max |
| Carbon, C | 0.015 max |
| Nickel, Ni | Remainder |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.64 g/cm³ | 0.312 lb/in³ |
| Melting point | 1427°C | 2600°F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 738 MPa | 107000 psi |
| Yield strength ( @ 0.2% offset) | 492 MPa | 71400 psi |
| Elastic modulus | 211 GPa | 30600 ksi |
| Elongation at break (in 50.8 mm) | 42% | 42% |
Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ 20°C/68°F) | 10.8 µm/m°C | 6 µin/in°F |
| Thermal conductivity (@ 23°C/73°F) | 10.1 W/mK | 70.1 BTU in/hr.ft².°F |
Heat treatment, working and machining
Recommended working and heat treatment parameters:
- Forging: 1177-954 °C
- Soft annealing: 1065±14 °C; 30 min; WQ
Forging - alloy can be hot forged within a rather narrow temperature range, starting at 1177°C and finishing at 954°C. Moderate reductions and frequent re-heating are recommended for optimal results. The alloy is sensitive to strain.
Cold working does not reduce the general corrosion resistance, but it can affect resistance to stress corrosion cracking. Post-working annealing is important for best corrosion performance.
Annealing involves heating to 1066°C and water quenching. A hold time at the annealing temperature of 10 to 30 minutes is recommended, with thicker structures requiring the full 30 minutes. Annealing is essential after hot forming operations and any cold forming that results in an outer fiber elongation of 7% or more.
Postweld heat treatment for caustic applications - Heat the material to 705 °C and maintain this temperature for at least 0.5 hours per 25 mm of thickness. Determine the heating and cooling rates based on the shape of the part. For complex shapes with nonuniform thicknesses, use heating and cooling rates of 111 °C per hour. Shapes with uniform thicknesses can employ faster heating and air cooling.
Application
- Components used in wastewater treatment
- Components used in chemical processing
- Nuclear fuel processing
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