Alloy 625 VS Hastelloy C276, what is the difference? They both have amazing corrosion resistance. When your piping system requires optimal performance and standard stainless steel simply won’t cut it, compare the differences between the two to find the better choice. Ensure that your stainless steel pipes and stainless steel pipe fittings are built to last.
What Are Alloy 625 and Hastelloy C276? Elite Performers!
Alloy 625 Pipe | N06625 | W.Nr. 2.4856 Nickel Alloy Pipe & Tube is a nickel-chromium-molybdenum alloy. It is characterized by high strength and has a wide range of corrosion resistance. It excels in many aggressive media.
Hastelloy C276 (UNS N10276, EN 2.4819) is also a nickel-chromium-molybdenum alloy. It has a high molybdenum and tungsten content, which gives it exceptional corrosion resistance. It excels in extremely corrosive environments.
Alloy 625 VS Hastelloy C276: Key Differentiators
Alloy 625 has a wide range of corrosion resistance and handles oxidizing and reducing acids well. Hastelloy C276 has excellent corrosion resistance and performs well in aggressive oxidizing and reducing media, including wet chlorine.
Alloy 625 has higher strength and performs well from low temperatures to 1000 ℃. Hastelloy C276 also has excellent high-temperature strength and resists corrosion at extreme temperatures.
Hastelloy C276 has a high molybdenum and tungsten content, which greatly increases resistance to pitting and crevice corrosion. This gives C276 an advantage in very specialized and harsh environments.
Both have high weldability. Hastelloy C276 is slightly more difficult to weld due to its high alloy content. Proper welding procedures are critical for both. The lower carbon version improves post weld integrity.
In general, Hastelloy C276 is more expensive due to its unique composition and excellent wear resistance.
Global Designations: Alloy 625 VS Hastelloy C276
| Standard Body | Alloy 625 Designation | Hastelloy C276 Designation |
|---|---|---|
| UNS | N06625 | N10276 |
| EN | 2.4856 | 2.4819 |
| ASTM/ASME | B443, B444, B474, etc. | B575, B574, B619, etc. |
| ISO | 6208 | 15156-3 |
| GB (China) | NS3306 | NS3304 |
Key Chemical Composition: Alloy 625 VS Hastelloy C276
| Element | Ni | Cr | Mo | W | Fe | Nb | C |
|---|---|---|---|---|---|---|---|
| Alloy 625 | ≥58.0 | 20.0-23.0 | 8.0-10.0 | ≤0.35 | ≤5.0 | 3.15-4.15 | ≤0.10 |
| Hastelloy C276 | Balance (Min 53.0) | 14.5-16.5 | 15.0-17.0 | 3.0-4.5 | 4.0-7.0 | N/A | ≤0.01 |
Mechanical Properties: Alloy 625 VS Hastelloy C276
| Property | Tensile Strength | Yield Strength | Elongation | Density |
|---|---|---|---|---|
| Alloy 625 | ≥827 MPa (120 ksi) | ≥414 MPa (60 ksi) | ≥30% | 8.43g/cm³ |
| Hastelloy C276 | ≥690MPa (100 ksi) | ≥275MPa (40 ksi) | ≥40% | 8.89g/cm³ |
Applications in Stainless Steel Pipe and Fittings
- Alloy 625: Chemical processing (sulfuric acid, nitric acid), aerospace (engine components), marine (seawater components) and pollution control (flue gas desulfurization systems).
- Hastelloy C276: For use in extremely corrosive environments. This includes wet chlorine gas, hypochlorite solutions and highly oxidizing acid mixtures. Commonly used in pharmaceutical reactors, waste treatment and sour gas treatment.
- Piping Systems: These two alloys make important stainless steel pipe and fittings. They handle corrosive fluids and can withstand high pressures and temperatures.
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