Nickel Alloy Inconel 693-HF (Hot Finished)
Grade
UNS N06693
Choose for large-diameter bar, forging stock and flange/valve bodies where surface finish is secondary.
Values for the HF condition
Other Inconel 693 tempers and conditions
Inconel 693 is listed in 4 conditions; see the grade overview at Inconel 693.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HFThis page 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 |
What is Inconel 693-HF?
Inconel 693-HF is Inconel 693 in the HF grade — choose for large-diameter bar, forging stock and flange/valve bodies where surface finish is secondary. Inconel 693-HF has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi). Inconel 693-HF 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). ANN is the default condition FabDigit quotes; HF is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
Inconel 693-HF properties
Typical room-temperature values for Inconel 693-HF; 22 are specific to this condition. Other listed values are Inconel 693 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Inconel 693-HF 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-HF has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Inconel 693-HF 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-HF 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-HF 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-HF's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability good (55/100); formability good (58/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Inconel 693-HF
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.
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.
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) | — |
Inconel 693-HF — frequently asked
What is Inconel 693-HF used for?
Inconel 693-HF 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-HF?
Inconel 693-HF has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Inconel 693-HF easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% 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-HF 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-HF?
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-HF 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-HF?
Inconel 693-HF 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.