Inconel 600
2.4816Nickel-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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS N06600 | N06600 | REF |
| 🇪🇺 | EN | Europe | NiCr15Fe | 2.4816 | 100% |
| 🇬🇧 | BS | United Kingdom | NA14 | — | 95% |
| 🇫🇷 | AFNOR | France | NC15Fe | — | 95% |
Sources: ASTM B168, DIN 17742, BS 3072, AFNOR
Chemical composition comparison (wt%)
Side-by-side: Inconel 600 (ASTM) (ASTM B168) vs NA14 (BS)
| Element | Inconel 600 (ASTM) | NA14 (BS) | Overlap |
|---|---|---|---|
| C | 0–0.15% | — | — |
| Si | 0–0.5% | — | — |
| Mn | 0–1% | — | — |
| S | 0–0.015% | — | — |
| Cr | 14–17% | — | — |
| Ni | ≥ 72% | — | — |
| Cu | 0–0.5% | — | — |
| Fe | 6–10% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 550 | MPa |
| Yield Strength | ≥ 240 | MPa |
| Elongation | ≥ 30 | % |
| Elastic Modulus | ≥ 214 | GPa |
| Density | ≥ 8.47 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 870–980 °C | air | 15-60 min | Not age hardenable. Only cold work strengthens. |
| solution_treating | 1090–1150 °C | air | 1-2 hours | Dissolves carbides, increases grain size for creep resistance |
Compatibility verdict
Inconel 600 and NA14: 95% composition match
Close equivalents but NOT identical.
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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