Inconel 600 vs Inconel 625: Both solid-solution Ni-Cr alloys — 625 has Mo/Nb for higher strength and pitting resistance
Inconel 600 vs Inconel 625
Side-by-side chemical composition and mechanical property comparison.
Overview
Inconel 600
2.4816
Nickel-chromium-iron alloy — the standard engineering material for combined heat and corrosion resistance. Not precipitation hardenable. Virtually immune to chloride-ion stress corrosion cracking. Service from cryogenic to 1095°C. Used for furnace components, nuclear steam generators, chemical plant equipment, and food processing.
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.
| Inconel 600 | Inconel 625 | |
|---|---|---|
| Material Number | 2.4816 | 2.4856 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B168 | ASTM B443 |
Chemical composition (wt%)
| Element | Inconel 600 | Inconel 625 | Overlap |
|---|---|---|---|
| C | 0–0.15% | 0–0.1% | OK |
| Si | 0–0.5% | 0–0.5% | OK |
| Mn | 0–1% | 0–0.5% | OK |
| S | 0–0.015% | — | — |
Mechanical properties
| Property | Inconel 600 | Inconel 625 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 550 | ≥ 827 | MPa |
| yield_strength | ≥ 240 | ≥ 414 | MPa |
| elongation | ≥ 30 | ≥ 30 | % |
Compatibility Assessment
Inconel 600 has 72% Ni for better SCC immunity. Inconel 625 adds 9% Mo + 3.6% Nb for 50% higher strength and far better pitting resistance. 600 is the economy choice for heat resistance; 625 for corrosion-critical.
Frequently Asked Questions
Is Inconel 600 the same as Inconel 625?
Inconel 600 and Inconel 625 have a 55% composition overlap. Both solid-solution Ni-Cr alloys — 625 has Mo/Nb for higher strength and pitting resistance
Can I replace Inconel 600 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 Inconel 600 and Inconel 625?
The main differences are in the following elements: Cr, Ni, Fe. Inconel 600 is a Nickel Alloys grade, while Inconel 625 is a Nickel Alloys grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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