Hangbo Alloy Group
Shanghai · Est. 2012
UNS N06117 family / chemistry matching Inconel 617 (UNS N06617, W.Nr 2.4663) — A nickel-chromium-cobalt-molybdenum superalloy engineered for combustion cans, transition ducts, and hot-section components operating up to ~1100°C.
Inconel 117 is a nickel-chromium-cobalt-molybdenum (Ni-Cr-Co-Mo) superalloy developed for high-temperature gas-turbine and aerospace service. Its chemistry corresponds to the long-established Inconel 617 family (UNS N06617, W.Nr 2.4663, EN NiCr22Co12Mo) — one of the few nickel alloys covered by the ASME Boiler & Pressure Vessel Code with allowable design stresses up to 1800°F (980°C). The same "Inconel 117" name is also used by Special Metals for the ENiCrCoMo-1 welding electrode whose weld metal matches this chemistry.
Inconel 117 derives its exceptional high-temperature strength from a balanced combination of solid-solution strengthening (chromium, molybdenum, cobalt) and precipitation strengthening from gamma-prime Ni₃(Al,Ti) and chromium/carbide precipitates. With roughly 20-24% chromium and 0.8-1.5% aluminum, it forms a stable, adherent oxide scale that resists oxidation, carburization, and nitridation to about 1100°C. These attributes make it the preferred material for combustion cans, liners, transition ducts, and other hot-section components in both aerospace and land-based gas turbines. Hangbo Alloy Group supplies Inconel 117 / Inconel 617-family material in all wrought and forged product forms with full AWS/ASME/AMS certification.
Hangbo Alloy Group supplies Inconel 117 (Inconel 617-family) plate, bar, forgings, tube, and matched ENiCrCoMo-1 welding consumables — all with full material certification and traceability. Mill and stock orders available for turbine and furnace applications.
The composition of Inconel 117 corresponds to the Inconel 617 family, controlled by specifications such as AMS 5888, ASTM B166, and ASME SB166. The high cobalt and molybdenum content distinguishes it from Ni-Cr-Fe alloys, while aluminum and titanium provide precipitation strengthening.
| Element | Standard Range (wt%) | Typical Value | Role in the Alloy |
|---|---|---|---|
| Nickel (Ni) | Remainder | Balance | Austenitic matrix; corrosion resistance; high-temperature stability |
| Chromium (Cr) | 20.0 – 24.0 | 22.0 | Cr₂O₃ protective scale; oxidation and SCC resistance |
| Cobalt (Co) | 10.0 – 15.0 | 12.5 | Solid-solution strengthening; raises hot strength |
| Molybdenum (Mo) | 8.0 – 10.0 | 9.0 | Solid-solution strengthening; creep resistance |
| Aluminum (Al) | 0.80 – 1.50 | 1.10 | γ′ formation (Ni₃(Al,Ti)); oxide-scale adhesion |
| Titanium (Ti) | ≤ 0.60 | 0.35 | γ′ formation; grain refinement |
| Carbon (C) | 0.05 – 0.15 | 0.08 | Carbide precipitation for creep strength |
| Iron (Fe) | ≤ 3.0 | 1.5 | Cost control; kept low to preserve hot strength |
| Boron (B) | ≤ 0.006 | 0.003 | Grain-boundary strengthening (modified grades) |
| Manganese (Mn) | ≤ 0.50 | 0.20 | Deoxidation, sulfur control |
| Silicon (Si) | ≤ 0.50 | 0.20 | Deoxidation; controlled to limit hot cracking |
| Copper (Cu) | ≤ 0.50 | 0.10 | Trace impurity limit |
| Phosphorus (P) | ≤ 0.015 | 0.010 | Impurity control for ductility |
| Sulfur (S) | ≤ 0.015 | 0.008 | Impurity control for hot cracking resistance |
Key compositional insight: The cobalt + molybdenum combination is what gives Inconel 117 its superior creep-rupture strength relative to Ni-Cr-Fe or Ni-Mo-W alloys, while chromium and aluminum provide long-term oxidation resistance. The aluminum/titanium level is tuned so that gamma-prime precipitates strengthen the alloy without causing embrittlement.
Physical properties of Inconel 117 are those of the Inconel 617 family; the thermal conductivity rises significantly with temperature, which is typical of nickel alloys.
| Property | Value | Notes |
|---|---|---|
| Density | ~8.32 – 8.40 g/cm³ | Lower than tungsten-containing alloys |
| Melting Range | ~1330 – 1380 °C | Depends on exact composition |
| Thermal Expansion (20–100°C) | ~11.6 × 10−6 /°C | Moderate, near austenitic SS |
| Thermal Conductivity (at 20°C) | ~13.4 W/(m·K) | Rises to ~28 W/(m·K) at 1000°C |
| Specific Heat | ~419 J/(kg·K) | At room temperature |
| Electrical Resistivity | ~122 μΩ·cm | Typical nickel-alloy value |
| Modulus of Elasticity | ~212 GPa | At room temperature |
| Magnetic Properties | Non-magnetic (austenitic FCC) | |
| Crystal Structure | Face-Centered Cubic (FCC) | |
| Property | Typical Value | Indicative Minimum |
|---|---|---|
| Tensile Strength (Rm) | 700 – 810 MPa | ≥ 655 MPa |
| Yield Strength (Rp0.2) | 300 – 410 MPa | ≥ 240 MPa |
| Elongation (A) | 35 – 58% | ≥ 35% |
| Hardness | ~180 – 230 HB | — |
Note: Exact values depend on product form, section size, and heat treatment. For long-term high-temperature design, always use manufacturer creep-rupture data.
| Temperature | Yield Strength Rp0.2 | Tensile Strength Rm |
|---|---|---|
| 20 °C | 300 MPa | 700 MPa |
| 400 °C | 210 MPa | 570 MPa |
| 600 °C | 190 MPa | 510 MPa |
| 700 °C | 185 MPa | 400 MPa |
| 750 °C | 180 MPa | 340 MPa |
The alloy retains useful strength well above 700°C and is commonly used up to 1000-1100°C in oxidizing service. Its estimated 100,000-hour creep-rupture strength at 700°C exceeds ~110 MPa, supporting long-life turbine and nuclear applications.
Inconel 117 is typically supplied in the solution-annealed condition at ~1175 – 1185°C followed by rapid cooling (water or air quench). This dissolves carbides and gamma-prime, producing a coarse grain structure that maximizes creep-rupture strength. The ASME-approved solution anneal is about 2150°F (1175°C).
Newly solution-annealed and welded components are susceptible to relaxation (stress-relief) cracking if exposed to service temperatures of roughly 500-780°C without prior stabilization. A stabilizing heat treatment at ~980°C (1800°F) for about 3 hours dissolves gamma-prime and relaxes residual stresses, preventing crack initiation. Heating and cooling rates for this treatment are not critical.
The alloy work-hardens rapidly and has a high hot strength, so machining requires rigid setups, positive feeds, and carbide or ceramic tooling. Welding is performed with matching Ni-Cr-Co-Mo filler metals (ERNiCrCoMo-1 / ENiCrCoMo-1) using GTAW, GMAW, SMAW, or SAW. Low heat input and interpass control minimize distortion and preserve properties.
Contact Hangbo Alloy Group for certified Inconel 117 (Inconel 617-family) plate, bar, forgings, tube, and matched ENiCrCoMo-1 / ERNiCrCoMo-1 welding wire and electrodes. Competitive pricing, fast delivery, full mill test reports.
Inconel 117 offers excellent high-temperature corrosion resistance due to its chromium and aluminum content:
Hangbo Alloy Group supplies Inconel 117 / Inconel 617-family material in the following product forms, manufactured to ASTM/ASME and AMS specifications:
| Product Form | Applicable Standard | Typical Condition |
|---|---|---|
| Plate, Sheet, Strip | ASTM B168 / ASME SB168; AMS 5888/5889 | Solution annealed |
| Round Bar, Rod, Forged Block | ASTM B166 / ASME SB166; AMS 5887 | Solution annealed |
| Seamless & Welded Tube / Pipe | ASTM B167 / B163; ASME SB167/SB163 | Solution annealed |
| Forgings & Flanges | ASTM B564 / ASME SB564 | Solution annealed |
| Wire & Ribbon | ASTM B166 / ISO 9724 | Solution annealed / spring temper |
| Powder (Additive Mfg.) | Custom / producer spec | Gas-atomized |
All products are supplied with EN 10204 Type 3.1 material certificates including chemical analysis, mechanical test results, and full heat-number traceability. Aerospace- and nuclear-grade lots with additional NDT and documentation are available on request.
| Standard | Description |
|---|---|
| UNS N06117 / N06617 | Unified Numbering System (customer designation / Inconel 617) |
| W.Nr | — (not assigned to the 117 designation; Inconel 617 = 2.4663, EN NiCr22Co12Mo) |
| ASTM B166 / B168 / B564 | Bar, rod, plate, sheet, forgings |
| ASME SB166 / SB168 / SB564 | ASME Boiler & Pressure Vessel Code equivalents |
| AMS 5887 / 5888 / 5889 | Aerospace material specifications (bar; plate; coil) |
| ISO 9724 / 6208 | Nickel-alloy rod, bar, and plate/sheet standards |
| AWS A5.14 / A5.11 | Matching filler metals ERNiCrCoMo-1 / ENiCrCoMo-1 |
| Property | Inconel 117 (Ni-Cr-Co-Mo) | Inconel 625 | Hastelloy X | Inconel 718 |
|---|---|---|---|---|
| UNS | N06117 / N06617 | N06625 | N06002 | N07718 |
| Key alloying | Cr, Co, Mo | Cr, Mo, Nb | Cr, Mo, W, Fe | Cr, Nb, Mo, Ti |
| Strengthening | SS + γ′ / carbide | Solid solution | Solid solution | γ″ / γ′ precipitation |
| Sustained temp. | ~1000–1100°C | ~900°C | ~980°C | ~650°C |
| Creep strength | Excellent | Good | Good | Very high (moderate T) |
| Oxidation resist. | Excellent | Excellent | Excellent | Very good |
| Aqueous corrosion | Good | Excellent | Good | Good |
| Primary use | Gas-turbine hot section | Corrosion + moderate T | Furnace / aero sheet | Discs, shafts, fasteners |
Selection guide: Choose Inconel 117 when the application demands long-term creep and oxidation resistance above ~900°C in gas-turbine or furnace service. Choose Inconel 625 for aggressive aqueous corrosion with moderate temperature. Choose Hastelloy X for cost-sensitive high-temperature sheet applications. Choose Inconel 718 for very high strength at moderate (≤650°C) temperatures.
Inconel 117 is a nickel-chromium-cobalt-molybdenum (Ni-Cr-Co-Mo) superalloy for high-temperature gas-turbine and aerospace service. Its chemistry corresponds to the well-documented Inconel 617 family (UNS N06617, W.Nr 2.4663, EN NiCr22Co12Mo). The same "Inconel 117" designation is also used by Special Metals for the ENiCrCoMo-1 welding electrode whose weld metal matches this chemistry. In this guide Inconel 117 is treated as the wrought/precipitation-strengthened superalloy; the customer-designation UNS is N06117.
Typical composition (corresponding to Inconel 617 / N06617 per AMS 5888 and ASTM B166): Ni remainder; Cr 20.0-24.0%; Co 10.0-15.0%; Mo 8.0-10.0%; Al 0.80-1.50%; Ti ≤0.60%; C 0.05-0.15%; Fe ≤3.0%; Si ≤0.50%; Mn ≤0.50%; Cu ≤0.50%; B ≤0.006%; P ≤0.015%; S ≤0.015%. Cobalt and molybdenum provide solid-solution strengthening; aluminum (and titanium) form gamma-prime Ni3(Al,Ti) and carbides for precipitation strengthening.
Typical physical properties: density ~8.32-8.40 g/cm3; melting range 1330-1380°C; coefficient of thermal expansion ~11.6 x 10^-6 /°C (20-100°C); thermal conductivity ~13.4 W/(m·K) at room temperature (rising to ~28 W/(m·K) at 1000°C); specific heat ~419 J/(kg·K); electrical resistivity ~122 μΩ·cm; modulus of elasticity ~212 GPa at room temperature. The alloy has an FCC austenitic structure.
In the solution-annealed condition, typical room-temperature properties are tensile strength 700-810 MPa, yield strength 300-410 MPa, elongation 35-58%. At elevated temperature it retains useful strength: at 600°C about 510 MPa tensile / 190 MPa yield; at 700°C about 400 MPa tensile / 185 MPa yield; at 750°C about 340 MPa tensile / 180 MPa yield. These values make Inconel 117 suitable for sustained service up to roughly 1000-1100°C.
Inconel 117 is typically supplied solution-annealed at about 1175-1185°C followed by rapid cooling, producing a coarse grain structure favorable for creep-rupture strength. Hot working is carried out in the range ~927-1205°C, finishing above ~950°C. After welding newly solution-annealed material, a stabilizing post-weld heat treatment at ~980°C for about 3 hours is recommended to prevent relaxation cracking in the 500-780°C service range.
Inconel 117 is strengthened by (1) solid-solution strengthening from chromium, molybdenum, and cobalt; (2) carbide precipitation (mainly chromium carbides and MC-type carbides); and (3) precipitation of gamma-prime Ni3(Al,Ti). This mixed strengthening gives excellent creep-rupture strength and oxidation resistance above ~980°C, which is why it is favored for gas-turbine hot-section components.
Because Inconel 117 corresponds to the Inconel 617 family, the applicable standards are: UNS N06117 (customer designation) / N06617 (Inconel 617); W.Nr — (not assigned to the 117 designation; Inconel 617 is 2.4663, EN NiCr22Co12Mo); ASTM B166 / B168 and ASME SB166 / SB168; AMS 5887, 5888, 5889; ISO 9724 / 6208; and ASME design stresses up to 1800°F (980°C). Matching fillers are AWS A5.14 ERNiCrCoMo-1 and AWS A5.11 ENiCrCoMo-1.
Primary applications are high-temperature gas-turbine and aerospace components: combustion cans, liners, transition ducts, inner housings, and turbine rings. It is also used in land-based gas turbines, industrial furnaces (radiant tubes, muffles, fixtures), high-temperature heat exchangers and recuperators, petrochemical cracking and reformer furnaces, and high-temperature nuclear components such as VHTR intermediate heat exchangers.
Inconel 117 (Ni-Cr-Co-Mo) offers higher sustained-temperature capability (~1000-1100°C) and better creep strength than Inconel 625 (~900°C, Nb-Mo solid solution) and Hastelloy X (~980°C, Mo-W solid solution), at somewhat lower aqueous corrosion resistance than 625. Inconel 718 is a gamma-double-prime precipitation alloy optimized for ~650°C service and very high strength at moderate temperatures, whereas Inconel 117 is optimized for long-term creep and oxidation above ~900°C.
Yes. Inconel 117 is readily weldable by GTAW (TIG), GMAW (MIG), SMAW, and SAW using matching Ni-Cr-Co-Mo filler metals (ERNiCrCoMo-1 / ENiCrCoMo-1). Because it is solid-solution and precipitation strengthened, welding with matching filler generally preserves high-temperature properties. A post-weld stabilizing heat treatment at ~980°C for 3 hours is recommended for newly solution-annealed and welded components to avoid relaxation cracking in the 500-780°C service range.
Hangbo Alloy Group supplies Inconel 117 / Inconel 617-family material in plate, sheet, and strip; round bar, rod, and forged blocks; seamless and welded tube and pipe; wire and ribbon; forgings and flanges; and powder for additive manufacturing. All forms are available solution-annealed with EN 10204 3.1 mill test certificates and full heat-number traceability.
Inconel 117 / Inconel 617-family material is a premium high-temperature alloy with significant cobalt and molybdenum. Typical pricing ranges from $55-110/kg for wrought plate, bar, and sheet, and $90-180/kg for forgings and seamless tube, depending on product form, size, certification, and cobalt/nickel markets. Lead times are typically 6-12 weeks for standard mill forms and 12-20 weeks for forgings and certified heavy sections. Contact serena@hangboalloy.com for a competitive quote.
Yes. The combination of chromium (~20-24%) and aluminum (~0.8-1.5%) forms a stable, adherent oxide scale that gives Inconel 117 excellent resistance to oxidation in static and cyclic conditions up to about 1100°C. It also resists carburization and nitridation better than many nickel alloys. In extremely oxidizing combustion atmospheres there can be some tendency for internal aluminum-nitride formation, so the specific service atmosphere should be checked; for long-term creep-critical designs, manufacturer creep-rupture data and protective coatings should be considered.
