Inconel 625 vs 316L: Completely different material classes — Ni superalloy vs austenitic stainless
Inconel 625 vs 316L
Side-by-side chemical composition and mechanical property comparison.
Overview
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.
316L
1.4404
Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
| Inconel 625 | 316L | |
|---|---|---|
| Material Number | 2.4856 | 1.4404 |
| Category | Nickel Alloys | Stainless Steel |
| Standard | ASTM B443 | EN 10088-2 |
Chemical composition (wt%)
| Element | Inconel 625 | 316L | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.03% | OK |
| Si | 0–0.5% | 0–1% | OK |
| Mn | 0–0.5% | 0–2% | OK |
| P | — | 0–0.045% | — |
Mechanical properties
| Property | Inconel 625 | 316L | Unit |
|---|---|---|---|
| tensile_strength | ≥ 827 | 520–680 | MPa |
| yield_strength | ≥ 414 | ≥ 220 | MPa |
| elongation | ≥ 30 | ≥ 40 | % |
Compatibility Assessment
Inconel 625 has twice the tensile strength (827 vs 520 MPa), operates to 982°C (vs ~800°C for 316L), and has vastly superior chloride resistance. 316L costs ~1/5 the price. Choose 316L unless the environment demands superalloy performance.
Frequently Asked Questions
Is Inconel 625 the same as 316L?
Inconel 625 and 316L have a 20% composition overlap. Completely different material classes — Ni superalloy vs austenitic stainless
Can I replace Inconel 625 with 316L?
Generally not recommended. The compositions differ significantly (20% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Inconel 625 and 316L?
The main differences are in the following elements: Cr, Mo, Ni. Inconel 625 is a Nickel Alloys grade, while 316L is a Stainless Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.