Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Incoloy 800H vs Inconel 600, UNS N08810 vs UNS N06600
Verdict in one sentence: Inconel 600 wins in pure carburizing and nitriding furnace atmospheres and in chloride stress-corrosion service; Incoloy 800H wins on cost-per-creep-life in plain high-temperature oxidation service to 815 deg C. The two share a chromium content around 20 percent but differ sharply in matrix base: Incoloy 800H is Ni-Fe-Cr (30 to 35 percent Ni, balance Fe), Inconel 600 is Ni-Cr-Fe (72 percent Ni minimum, 14 to 17 percent Cr, 6 to 10 percent Fe). The higher nickel content of Inconel 600 drives both its superior carburization resistance (Ni does not form stable carbides easily) and its immunity to chloride stress-corrosion (the 45 percent Ni threshold is the recognised boundary). The trade-off is mill price: Inconel 600 typically runs 30 to 50 percent more expensive per kilogram than Incoloy 800H on London Metal Exchange spot. This page lays out the side-by-side chemistry, mechanical floors, decision rules and welding-filler differences.
At a Glance Comparison
| Property | Incoloy 800H (N08810) | Inconel 600 (N06600) |
|---|---|---|
| Matrix base | Ni-Fe-Cr (iron-base) | Ni-Cr-Fe (nickel-base) |
| Nickel (Ni) | 30.0 to 35.0 percent | 72.0 percent min |
| Chromium (Cr) | 19.0 to 23.0 percent | 14.0 to 17.0 percent |
| Iron (Fe) | balance, ~39.5 percent | 6 to 10 percent |
| Max sustained service temp | 815 deg C ASME (982 deg C oxidation) | 1093 deg C oxidation |
| Indicative mill price | baseline | ~ 30 to 50 percent higher per kg |
Chemistry Side-by-Side
| Element | Incoloy 800H | Inconel 600 | Functional role |
|---|---|---|---|
| Nickel (Ni) | 30.0 to 35.0 | 72.0 min | Austenite stabilizer; matrix base |
| Chromium (Cr) | 19.0 to 23.0 | 14.0 to 17.0 | Cr2O3 passive film; oxidation |
| Iron (Fe) | balance | 6 to 10 | Solution-strengthening; cost-base |
| Carbon (C) | 0.05 to 0.10 | 0.15 max | Creep carbide vs unrestricted |
| Manganese (Mn) | 1.50 max | 1.00 max | Sulfur tie-up |
| Sulfur (S) | 0.015 max | 0.015 max | Tramp limit |
| Silicon (Si) | 1.00 max | 0.50 max | Deoxidation |
| Copper (Cu) | 0.75 max | 0.50 max | Tramp limit |
| Al + Ti combined | 0.30 to 1.20 | n/a | Creep + carburization defence on 800H |
Mechanical Properties Side-by-Side
| Property at RT | Incoloy 800H | Inconel 600 |
|---|---|---|
| Tensile strength (Rm) | >= 450 MPa (65 ksi) | >= 550 MPa (80 ksi) |
| 0.2 percent proof stress | >= 170 MPa (25 ksi) | >= 240 MPa (35 ksi) |
| Elongation A5 | >= 30 percent | >= 30 percent |
| Tensile at 540 deg C | ~ 415 MPa | ~ 480 MPa |
| Creep rupture stress 100,000 hr at 815 deg C | ~ 14 MPa | ~ 8 MPa |
[All values are indicative; verify against ASME Section II Part D Table 1A and Special Metals high-temperature datasheets.]
When to Specify Incoloy 800H Over Inconel 600
- Plain high-temperature oxidation service to 815 deg C with no carburizing or nitriding atmosphere
- ASME Section VIII Division 1 pressure vessels with sustained service above 540 deg C, code is qualified under SB-407 / SB-408 / SB-409 / SB-564
- Hydrocracker, hydrotreater and reformer feed-effluent exchangers where chloride is not the controlling failure mode
- Cost-controlled procurement where the 30 to 50 percent mill-price saving over Inconel 600 is material to project economics
- Standardised supply chain, TorqBolt stocks the full SB-series Incoloy 800H form-factor range across pipe, tube, plate, bar, forgings, flanges, fittings and fasteners
When Inconel 600 Wins
- Carburizing furnace retorts: cyclic-temperature service where carbon ingress accelerates; Ni above 70 percent gives longer retort life
- Nitriding furnace muffles: nitrogen pickup is slower on high-Ni alloys
- Chloride stress-corrosion service: above the 45 percent Ni threshold, immune to chloride SCC; Incoloy 800H at 30 to 35 percent Ni is susceptible
- Caustic stress-corrosion service: hot caustic above 50 percent NaOH attacks Ni-Fe-Cr at the chromium content of 800H; Inconel 600 is the qualified grade
- Aerospace exhaust components: combustor cans and turbine exhaust hardware where the cost premium is acceptable
Migration Notes
The two grades are NOT direct substitutes. The qualified specifications differ (Incoloy 800H uses SB-407 / B408 / B409 / B564; Inconel 600 uses SB-167 / B564 / B168). The welding-procedure qualification under ASME Section IX is different (Incoloy 800H is P-No. 45; Inconel 600 is P-No. 43). The all-weld-metal chemistry differs even though both use ERNiCr-3 filler. Substitution requires engineering review of the operating envelope, atmosphere chemistry and code qualification. Field-substituting one for the other on a code stamp invalidates the qualification.
Welding Filler Differences
| Process | Incoloy 800H filler | Inconel 600 filler |
|---|---|---|
| GTAW | ERNiCr-3 (Inconel 82) | ERNiCr-3 (Inconel 82) |
| GMAW | ERNiCr-3 spool | ERNiCr-3 spool |
| SMAW | ENiCrFe-2 (Inconel 182) | ENiCrFe-3 (Inconel 182) |
| SAW | ER NiCr-3 wire + matching flux | ER NiCr-3 wire + matching flux |
Price and Availability Differential
Inconel 600 mill price tracks roughly 30 to 50 percent above Incoloy 800H per kilogram on London Metal Exchange spot, driven primarily by the higher nickel content (72 percent versus 30 to 35 percent). Availability is widely supported by the same mill base (Special Metals, VDM Metals, Sandvik) but inventory volume on Incoloy 800H is materially larger because ASME Section VIII pressure-vessel demand from refinery and petrochemical projects is the dominant single use-case. For project-specific pricing and stock availability across pipe, bar, plate, forgings, flanges, fittings and fasteners, contact TorqBolt sales.
Related Comparison Pages
- Incoloy vs Inconel: family disambiguation
- Incoloy 800H vs Inconel 625: dual corrosion + temp service
- Incoloy 800H vs Incoloy 825: creep vs corrosion variant
- Incoloy 800 vs 800H vs 800HT: internal grade family
Frequently Asked Questions
Q. What is the headline difference between Incoloy 800H and Inconel 600?
Matrix base. Incoloy 800H is Ni-Fe-Cr (30 to 35 percent Ni, balance Fe, 19 to 23 percent Cr). Inconel 600 is Ni-Cr-Fe (72 percent Ni minimum, 14 to 17 percent Cr, 6 to 10 percent Fe). The higher nickel content of Inconel 600 wins in carburizing and nitriding furnace atmospheres and in chloride stress-corrosion service; Incoloy 800H wins on cost-per-creep-life in plain high-temperature oxidation service.
Q. Which wins in a carburizing furnace?
Inconel 600 wins. Its higher nickel content (72 percent versus 30 to 35 percent for Incoloy 800H) resists carburization attack better, especially in cyclic-temperature service where carbon ingress is accelerated. Incoloy 800H is qualified for carburizing service below 815 deg C but with shorter retort life than Inconel 600.
Q. Which wins in chloride stress-corrosion?
Inconel 600 wins. Nickel content above 45 percent is the recognised threshold for resistance to chloride stress-corrosion cracking. Incoloy 800H at 30 to 35 percent Ni sits below the threshold and is susceptible in hot chloride service; Inconel 600 at 72 percent Ni is immune.
Q. Which is cheaper?
Incoloy 800H. Lower nickel content (30 to 35 percent versus 72 percent for Inconel 600) drives a mill price differential of 30 to 50 percent depending on the London Metal Exchange nickel price on the heat date. Where the service envelope permits, Incoloy 800H gives most of the high-temperature benefit at materially lower cost.
Q. Are they interchangeable?
No. They are different alloy classes with different UNS codes, different ASTM specifications and different welding procedures. Substitution requires engineering review of the operating envelope, atmosphere chemistry and code qualification. ASME Section VIII Division 1 lists each grade separately in Section II Part D allowable-stress tables.
Satisfaction Survey
