Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
N06693 is a nickel-chromium-aluminium high-temperature alloy developed for resistance to metal dusting and other high-temperature corrosion mechanisms. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
With about 60% nickel, 29% chromium and 3% aluminium, Inconel 693 combines the excellent oxidation and sulfidation resistance conferred by its high chromium content — as in its predecessor alloy 690 — with a deliberate aluminium addition that markedly improves resistance to other forms of high-temperature attack. Of particular importance is its resistance to metal dusting, an aggressive form of carburisation that can cause rapid failure in reducing carbon-monoxide- and hydrogen-bearing atmospheres; N06693 offers the best metal-dusting resistance of any conventional alloy currently manufactured. It also resists oxidation and carburisation to about 1150 °C and performs well against sulfidation in both oxidising and reducing sulfur-bearing environments. It is supplied in the annealed condition.
Typical applications include synthesis-gas and hydrogen-production systems, petrochemical and refinery furnace and process equipment, and other components exposed to metal dusting, carburisation or high-temperature oxidation.
| Property | Value | Unit |
|---|---|---|
| Density | 7.95 | g/cm³ |
| Melting range | 1370–1410 | °C |
| Elastic modulus | 207 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 13.0 | µm/m·°C |
| Thermal conductivity (20 °C) | 11.0 | W/m·K |
| Specific heat (20 °C) | 450 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element (~60.5%) |
| Chromium | Cr | 27.0 | 31.0 | Oxidation / sulfidation resistance |
| Aluminium | Al | 2.50 | 4.00 | Metal-dusting / high-temperature corrosion resistance |
| Iron | Fe | 2.50 | 6.00 | Solid-solution element |
| Niobium | Nb | 0.50 | 2.50 | Carbide stabilisation |
| Titanium | Ti | — | 1.00 | Carbide stabilisation |
| Manganese | Mn | — | 1.00 | Deoxidiser |
| Silicon | Si | — | 0.50 | Deoxidiser |
| Carbon | C | — | 0.15 | Carbide formation |
Annealed condition, typical room-temperature values for UNS N06693.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (UTS) | ≥620 MPa (90 ksi) |
| Annealed | 0.2% yield strength | ≥275 MPa (40 ksi) |
| Annealed | Elongation at break | ≥30 % |
| Annealed | Hardness | ~90 HRB |
| — | Elastic modulus | 207 GPa |
Confirm against the mill test report. The high aluminium content gives the alloy good high-temperature strength but reduces room-temperature ductility relative to alloy 690.
| Environment | Performance | Notes |
|---|---|---|
| Metal dusting | Excellent | Best of any conventional alloy; key design advantage |
| High-temperature oxidation | Excellent | High Cr + Al; to about 1150 °C |
| Carburisation | Excellent | Resists carbon ingress |
| Sulfidation | Very Good | Oxidising and reducing sulfur environments |
| Oxide-rich media (glass frit, flux) | Good | To about 1100 °C |
The combination of high chromium and aluminium gives outstanding resistance to metal dusting, high-temperature oxidation, carburisation and sulfidation — corrosion mechanisms common in syngas, hydrogen and petrochemical service.
A solid-solution nickel-chromium-aluminium alloy; not hardenable by precipitation. Properties are set by annealing.
Anneal Anneal by heating to approximately 1010–1066 °C (1850–1950 °F), hold for a time appropriate to section thickness, and cool rapidly in air or water quench. Protect surfaces from contamination at temperature.
Good weldability for matching and dissimilar joints; welding is best performed in the annealed condition. The near-matching filler metal is INCONEL Filler Metal 53MD.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | INCONEL Filler Metal 53MD |
| GMAW / MIG | Good | INCONEL Filler Metal 53MD |
| SMAW / stick | Acceptable | Matching electrode |
Weld in the annealed condition with the near-matching 53MD filler; use clean, contamination-free surfaces.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Moderate; rigid setups, sharp carbide tooling, slow speeds |
| Work hardening | Work-hardens; positive feeds, avoid dwelling |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited; the high aluminium content reduces cold formability |
| Hot forming | Performed hot; anneal afterward; protect from contamination |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Syngas / hydrogen | Reformer and synthesis-gas system components | Metal-dusting resistance |
| Petrochemical / refining | Furnace tubes, process equipment | Carburisation + oxidation resistance |
| High-temperature process | Components to ~1150 °C | Oxidation + sulfidation resistance |
| Glass / flux exposure | Parts in oxide-rich media | High-temperature corrosion resistance |
| Product Form | Standard / Designation | Notes |
|---|---|---|
| Bar, rod and wire | UNS N06693 | Special Metals product |
| Plate, sheet and strip | UNS N06693 | Special Metals product |
| Welding products | AWS A5.14 (FM 53MD) | Near-matching filler |
| Material designation | UNS N06693 | US Patent 4,882,125 |
Nickel-chromium-aluminium high-temperature alloy. UNS N06693.
| UNS | Ni % | Cr % | Al % | Best Used For |
|---|---|---|---|---|
| N06693 | ~60.5 | 27–31 | 2.5–4.0 | Best metal-dusting resistance; syngas, hydrogen, petrochemical |
| N06690 | ~60 | 27–31 | — | High-Cr oxidation / sulfidation resistance |
| N06601 | ~60.5 | 21–25 | 1.0–1.7 | General high-temperature oxidation resistance |
| N06025 | ~62 | 24–26 | 1.8–2.4 | High-temperature strength + oxidation (602 CA) |
| N06600 | ~72 | 14–17 | — | General-purpose Ni-Cr high-temperature alloy |
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