Nickel Alloy Inconel 693
UNS N06693
Inconel 693 (UNS N06693) is a Ni-Cr-Al alloy in which the aluminium addition forms a protective alumina scale, giving resistance to metal dusting and high-temperature oxidation in reformer, syngas and incinerator atmospheres.
Reference datasheet — Inconel 693 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
Inconel 693 tempers and conditions
Inconel 693 is supplied in 4 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot Finished | Choose for large-diameter bar, forging stock and flange/valve bodies where surface finish is secondary. | 380 | 780 | 45 | 190 HB | 1.4 % IACS |
ANNDefault Annealed | Standard stocked condition for all product forms in metal-dusting and high-temperature oxidation service. | 400 | 790 | 45 | 195 HB | — |
Annealed + Aged | Use when higher strength is required from the Al-bearing chemistry; aging also occurs in service around 650–800 °C. | 600 | 950 | 25 | 30 HRC | 1.5 % IACS |
Cold drawn | Pick for higher strength, tight tolerance and better surface on small bar and instrument tubing. | 700 | 950 | 25 | 27 HRC | 1.4 % IACS |
Supply forms, finishes and certifications
Ways Inconel 693 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WELD | As Welded | Surface finish |
What is Inconel 693?
Inconel 693 (UNS N06693) is a Ni-Cr-Al alloy in which the aluminium addition forms a protective alumina scale, giving resistance to metal dusting and high-temperature oxidation in reformer, syngas and incinerator atmospheres. It is supplied as tube, plate and bar in annealed, hot-finished, cold-drawn, aged and as-welded conditions, with 400 MPa yield, 790 MPa tensile, 45 % elongation, 195 HB and service to 1100 °C. Machinability is poor (16) and weldability only moderate (55) because Al and Nb raise hot-cracking risk. Alloy 601 is the usual fallback when metal dusting is not the controlling degradation mechanism. Inconel 693 has a density of 7.63 g/cm³ (0.276 lb/in³), lighter than 98% of nickel alloy grades. It melts at 1,343°C (2,449 °F). Inconel 693 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
What is Inconel 693 used for?
- waste incinerator components
- reformer tubes
- high-temperature furnace fixtures
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
Inconel 693 properties
Typical room-temperature values for Inconel 693-ANN; bars are the position among nickel alloy grades.
Physical3
Inconel 693 has a density of 7.63 g/cm³ (0.276 lb/in³), lighter than 98% of nickel alloy grades. It melts at 1,343°C (2,449 °F).
Mechanical13
Inconel 693 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Inconel 693 is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 10.6 W/m·K (6.12 BTU/hr·ft·°F), worse than 69% of nickel alloy grades. Thermal expansion is 12.6 µm/m·K (7 µin/in·°F).
Electrical3
Inconel 693 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 70% of nickel alloy grades.
Sustainability4
Producing a kilogram of Inconel 693 takes about 160 MJ of energy and emits 13 kg of CO₂ — less than 53% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Inconel 693's machinability is poor (16/100, worse than 71% of nickel alloy grades); weldability good (55/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Inconel 693 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Inconel 693
Is Inconel 693 easy to machine?
Machine like alloy 601/625: rigid setup, positive-rake carbide or ceramic, low speed with heavy positive feed, flood coolant, and never dwell — the alloy work-hardens rapidly.
Can Inconel 693 be welded?
GTAW/GMAW with matching Filler Metal 693; keep heat input and interpass temperature low, clean Al-oxide film before welding, and avoid high-restraint joints because Al+Nb raise hot-cracking risk.
Can Inconel 693 be formed, bent or molded?
Hot work 950–1200 °C then anneal; cold forming is possible but requires ~50% more force than 300-series stainless with intermediate anneals at ~1080 °C.
Inconel 693 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 27 – 31 | 29 |
| Fe | 2.5 – 6 | 4 |
| Alforms protective alumina-rich scale | 2.5 – 4 | 3.2 |
| Nb | 0.5 – 2.5 | 1 |
| Ti | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.5 | 0.05 |
| C | ≤ 0.15 | 0.04 |
| S | ≤ 0.01 | 0 |
| B | ≤ 0.01 | 0 |
| Zr | ≤ 0.1 | 0.03 |
| Nibalance, plus Co | ≥ 56 (balance) |
What surface finishes work on Inconel 693?
Pickle/passivate or grit-blast + descale after hot work; no anodizing — the in-service alumina/chromia scale is the protective layer, so avoid Cu- or S-bearing marking compounds.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Inconel 693 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06693
How much does Inconel 693 cost?
Inconel 693 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Inconel 693 — frequently asked
What is Inconel 693 used for?
Inconel 693 is typically used for waste incinerator components, reformer tubes and high-temperature furnace fixtures. In short: metal-dusting resistant grade; 1100 °C oxidation service; alumina-forming Ni-Cr-Al.
What is the yield strength of Inconel 693?
Inconel 693 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Inconel 693 easy to machine?
Not especially — machinability is rated poor (16/100, worse than 71% of nickel alloy grades). Machine like alloy 601/625: rigid setup, positive-rake carbide or ceramic, low speed with heavy positive feed, flood coolant, and never dwell — the alloy work-hardens rapidly.
Can Inconel 693 be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW with matching Filler Metal 693; keep heat input and interpass temperature low, clean Al-oxide film before welding, and avoid high-restraint joints because Al+Nb raise hot-cracking risk.
What surface finishes work on Inconel 693?
Pickle/passivate or grit-blast + descale after hot work; no anodizing — the in-service alumina/chromia scale is the protective layer, so avoid Cu- or S-bearing marking compounds.
Can Inconel 693 be formed, bent or molded?
Hot work 950–1200 °C then anneal; cold forming is possible but requires ~50% more force than 300-series stainless with intermediate anneals at ~1080 °C.
What is the maximum service temperature of Inconel 693?
Inconel 693 is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Inconel 693-ANN and Inconel 693-CD?
ANN is the default condition — standard stocked condition for all product forms in metal-dusting and high-temperature oxidation service. CD: pick for higher strength, tight tolerance and better surface on small bar and instrument tubing. Yield strength is 400 MPa in ANN versus 700 MPa in CD.
How much does Inconel 693 cost?
Inconel 693 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- INCONEL alloy 693 technical bulletin — Special Metals Corporation (2005)
- ASTM B168 / B166 / B564 (UNS N06693 nickel-chromium products) — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- UNS N06693 alloy data listing — SAE/ASTM Unified Numbering System (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.