Hastelloy C-276 vs Inconel 625: Both Ni superalloys — C-276 better reducing resistance, 625 better oxidizing
Hastelloy C-276 vs Inconel 625
Side-by-side chemical composition and mechanical property comparison.
Overview
Hastelloy C-276
2.4819
The most versatile corrosion-resistant alloy available. Ni-Mo-Cr-W composition resists both oxidizing and reducing environments. Outstanding resistance to pitting, stress corrosion cracking, and wet chlorine gas. Used in chemical processing, flue gas desulfurization, pulp & paper, and waste treatment.
Inconel 625
2.4856
Nickel-chromium-molybdenum-niobium superalloy. Solid-solution strengthened (no precipitation hardening required). Outstanding corrosion resistance from cryogenic to 982°C. Used for jet engine exhaust systems, marine components, chemical processing, flare stacks, and nuclear applications.
| Hastelloy C-276 | Inconel 625 | |
|---|---|---|
| Material Number | 2.4819 | 2.4856 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B575 | ASTM B443 |
Chemical composition (wt%)
| Element | Hastelloy C-276 | Inconel 625 | Overlap |
|---|---|---|---|
| C | 0–0.01% | 0–0.1% | OK |
| Si | 0–0.08% | 0–0.5% | OK |
| Mn | 0–1% | 0–0.5% | OK |
| Cr | 14.5–16.5% | 20–23% | No overlap |
Mechanical properties
| Property | Hastelloy C-276 | Inconel 625 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 690 | ≥ 827 | MPa |
| yield_strength | ≥ 310 | ≥ 414 | MPa |
| elongation | ≥ 40 | ≥ 30 | % |
Compatibility Assessment
C-276 has higher Mo (15-17% vs 8-10%) for superior reducing acid resistance. 625 has higher Cr (20-23% vs 14.5-16.5%) and Nb for better oxidizing resistance and higher strength. C-276 excels in HCl; 625 excels in chloride pitting.
Frequently Asked Questions
Is Hastelloy C-276 the same as Inconel 625?
Hastelloy C-276 and Inconel 625 have a 55% composition overlap. Both Ni superalloys — C-276 better reducing resistance, 625 better oxidizing
Can I replace Hastelloy C-276 with Inconel 625?
Generally not recommended. The compositions differ significantly (55% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Hastelloy C-276 and Inconel 625?
The main differences are in the following elements: Cr, Mo, Ni, Fe. Hastelloy C-276 is a Nickel Alloys grade, while Inconel 625 is a Nickel Alloys grade.
Related Comparisons
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