1. What is Hastelloy Alloy?
Hastelloy is a group of nickel-based alloys primarily alloyed with molybdenum (Mo) and chromium (Cr) to achieve exceptional corrosion resistance.
The design focus includes:
- Resistance to strong acids (sulfuric, hydrochloric)
- Protection against pitting and crevice corrosion
- Stable performance under elevated temperatures
👉 Simple comparison:
- Inconel → High temperature performance
- Hastelloy → Corrosion resistance
2. Key Properties
1）Excellent Corrosion Resistance
- Resistant to strong acids and chlorides
- Excellent resistance to pitting and crevice corrosion
- High resistance to stress corrosion cracking (SCC)
2）High Temperature Stability
- Maintains structural integrity at elevated temperatures
- Good oxidation resistance
3）Good Fabricability
- Weldable using conventional methods
- Suitable for various fabrication processes
3. Main Hastelloy Grades
1）C Series (Versatile Corrosion Resistance)
- Hastelloy C276 (UNS N10276)
→ Most widely used, suitable for complex corrosive environments
- Hastelloy C22 (UNS N06022)
→ Superior resistance to pitting and crevice corrosion
2）B Series (Reducing Environments)
- Hastelloy B2 (UNS N10665)
→ Excellent resistance to hydrochloric acid
- Hastelloy B3 (UNS N10675)
→ Improved thermal stability, recommended for modern applications
4. Chemical Composition Comparison (%)
| Grade | Ni | Mo | Cr | Fe | W | Co | C | Mn | Si |
|---|---|---|---|---|---|---|---|---|---|
| C276 | Bal. | 15–17 | 14.5–16.5 | 4–7 | 3–4.5 | ≤2.5 | ≤0.01 | ≤1 | ≤0.08 |
| C22 | Bal. | 12.5–14.5 | 20–22.5 | 2–6 | 2.5–3.5 | ≤2.5 | ≤0.015 | ≤0.5 | ≤0.08 |
| B2 | Bal. | 26–30 | ≤1 | ≤2 | — | ≤1 | ≤0.02 | ≤1 | ≤0.1 |
| B3 | Bal. | 28–32 | ≤3 | ≤3 | — | ≤3 | ≤0.01 | ≤3 | ≤0.1 |
5. Mechanical Properties (Solution Annealed)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| C276 | ≥690 | ≥283 | ≥40 |
| C22 | ≥690 | ≥310 | ≥45 |
| B2 | ≥760 | ≥345 | ≥40 |
| B3 | ≥760 | ≥310 | ≥40 |
6. Applications
| Industry | Application | Recommended Grades | Engineering Consideration |
|---|---|---|---|
| Chemical Processing | Reactors, pipelines | C276 / C22 | Mixed corrosion environments |
| Hydrochloric Acid Systems | Acid handling | B2 / B3 | Reducing environment only |
| FGD Systems | Scrubbers | C276 | Wet chlorine resistance |
| Oil & Gas | Corrosive fluids | C276 | Process variability |
7. Selection Guide
1）Based on Environment
- Oxidizing conditions → C22 / C276
- Reducing acids → B2 / B3
2）Based on Performance
- General applications → C276
- High-end projects → C22 / B3
3）Based on Risk Level
- Critical systems → Hastelloy
- Standard use → Stainless steel
8. Conclusion
Hastelloy alloys are essential materials for highly corrosive environments, especially in:
- Strong acid conditions
- Chloride-rich environments
- High-risk industrial systems
👉 C276 and B3 are the most commonly recommended grades due to their balanced performance and reliability.
Using the right Hastelloy alloy can significantly improve:
- Equipment safety
- Service life
- Operational stability
9. Take a closer look at how Hastelloy materials are processed in real production
In this video:
- Hastelloy C276 (UNS N10276) round bar cutting
- Seamless pipe cutting (Ø273 × 6.35 mm wall thickness)
10. Looking for Hastelloy materials for your project?
We supply:
- Hastelloy plates, pipes and bars
- Custom cutting & processing
- EN 10204 3.1 MTC
- Third-party inspection available
