Inconel 617 (UNS N06617 / W. Nr. 2.4663 / NiCr22Co12Mo) is a solid-solution-strengthened nickel-chromium-cobalt-molybdenum superalloy engineered for the most extreme combinations of high temperature, mechanical stress, and corrosive atmosphere. With cobalt (10–15%) and molybdenum (8–10%) as primary solid-solution strengtheners alongside an aluminum-chromium oxide-forming couple, Inconel 617 maintains exceptional creep-rupture strength up to 1,100 °C (2,012 °F) — a performance envelope that far surpasses conventional stainless steels and even most other nickel alloys.
Alloy 617 is unique among commercial nickel superalloys in combining three strengthening mechanisms in a single alloy: solid-solution hardening by Co and Mo, oxide-dispersion-like protection via an adherent Al₂O₃–Cr₂O₃ scale, and carbide precipitation strengthening at grain boundaries for creep resistance. The result is an alloy with a melting range of 1,330–1,410 °C, a density of only 8.36 g/cm³, and allowable stresses codified in ASME Section VIII for pressure vessels operating above 900 °C — a distinction shared by very few engineering alloys.
SHUNFU METAL applies controlled-atmosphere solution annealing at 1,140–1,200 °C in its dedicated vacuum-capable furnace, ensuring each bar meets ASTM B166 and AMS 5887 property minima before shipment. Full mechanical test reports, MTR per EN 10204 3.1, and third-party 3.2 witness inspection are available as standard or on request.
In oil & gas and petrochemical service, it is the go-to alloy for gas turbine hot-section components, steam reformer internals, fired-heater radiant tubes, and high-temperature pressure vessels where no other material can survive. SHUNFU METAL produces Inconel 617 bar from VIM-cast ingots, with optional VAR remelting for critical aerospace and power-generation grades, delivering controlled grain size and full segregation-free chemistry from heat to finished bar.
Equivalent Grades & Applicable Standards
| Standard Body | Designation / Grade | Specification / Form |
|---|---|---|
| ASTM | N06617 | B166 (bar & rod), B168 (plate/sheet), B167 (tube), B564 (forgings) |
| ASME | N06617 | SB-166 (bar), SB-168 (plate), SB-167 (tube), SB-564 (forgings) |
| AMS | — | AMS 5887 (bar, forgings & rings), AMS 5888 (sheet, strip & plate) |
| EN / DIN | NiCr22Co12Mo / 2.4663 | EN 10095, DIN 17744, DIN 17752 (bar), DIN 17754 (forgings) |
| ISO | NiCr23Co12Mo | ISO 9724 (wire), ISO 15156-3 (sour-service qualification) |
| GOST | ЭП617 / ХН55ВМТКЮ | GOST 5632 (heat-resistant alloys) |
| VdTÜV | Werkstoffblatt 485 | Plate, bar, tube (German pressure-vessel code approval) |
| GB / China | GH617 | GB/T 15008 (bar & rod for high-temperature service) |
Oil & Gas Applications of Inconel 617 Bar
The unique Ni-Cr-Co-Mo quadruplex strengthening of Inconel 617 makes it the specified alloy for these components across upstream, midstream, and downstream oil & gas operations:
- Combustion can liners
- Transition duct spacers
- Turbine blade damper pins
- Afterburner fuel nozzles
- Reformer tube support bars
- Catalyst grid support rings
- Cracker radiant tube hangers
- Ammonia converter internals
- Radiant section refractory anchors
- High-temperature thermowell bars
- Burner block retention bolts
- Heat shield support brackets
- Nuclear/fossil boiler tube sheets
- A-USC superheater headers
- Reactor pressure-vessel studs
- High-pressure valve spindles
N06617 Bar — Supply Dimensions
SHUNFU METAL stocks and produces Inconel 617 bar in the following forms. All stock is 100% ultrasonically tested; MTR per EN 10204 3.1 is standard with every shipment; 3.2 witness inspection available.
| Product Form | Section Profile | Size Range | Standard Length |
|---|---|---|---|
| Hot-Rolled Round Bar | Round | Ø 6 mm – Ø 200 mm | 3 m – 6 m (cut-to-length available) |
| Hot-Rolled Flat Bar | Flat / Square | Thickness 6–120 mm × Width 20–300 mm | 2 m – 6 m |
| Forged Round Bar | Round | Ø 80 mm – Ø 900 mm | 0.5 m – 4 m (custom billet & ingot) |
| Forged Flat Bar / Block | Flat / Block | Thickness 50–600 mm × Width up to 1,200 mm | Custom / as-ordered |
Surface finishes: as-forged/rolled (black), turned/peeled, centerless-ground, or polished. Custom profiles (hex, ring, disc) available on request. Tolerances per ASTM B166 or customer drawing.
Inconel 617 Chemical Composition
Composition limits per ASTM B166 for UNS N06617 bar & rod. SHUNFU METAL verifies each heat via OES and issues a full chemical certificate. Co and Mo content highlighted as the key differentiators from Alloy 600 and Alloy 601.
| Ni | Cr | Co | Mo | Al | Fe | C | Ti | Mn | Si | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Bal. (≥44.5) |
20.0–24.0 | 10.0–15.0 | 8.0–10.0 | 0.8–1.5 | ≤ 3.0 | 0.05–0.15 | ≤ 0.6 | ≤ 1.0 | ≤ 1.0 | ≤ 0.015 |
| All values in weight %. Co and Mo (highlighted) are the primary solid-solution strengtheners distinguishing Alloy 617 from all other commercial Inconel grades. |
Mechanical Properties of N06617 Bar
Typical and minimum values per ASTM B166 and AMS 5887. SHUNFU METAL performs tensile testing per ASTM E8 and Brinell hardness per ASTM E10 on every production lot. Test coupons are taken from actual bar ends and documented in the MTR.
| Condition | Tensile Strength MPa (ksi) |
0.2% Yield Strength MPa (ksi) |
Elongation % (min) |
Hardness HB (typ.) |
|---|---|---|---|---|
| Solution-Annealed (Hot-Finished Bar) | ≥ 690 (100) · typ. 725–758 (105–110) | ≥ 275 (40) · typ. 310–345 (45–50) | ≥ 35 | 150–195 |
| Annealed (Cold-Drawn Bar) | ≥ 725 (105) · typ. 760–825 (110–120) | ≥ 310 (45) · typ. 345–415 (50–60) | ≥ 25 | 170–220 |
| As-Forged / Solution-Annealed | typ. 690–795 (100–115) | typ. 275–380 (40–55) | ≥ 30 | 155–210 |
| Aged (760–870 °C, creep-optimized) | typ. 760–895 (110–130) | typ. 415–550 (60–80) | ≥ 20 | 185–230 |
Solution anneal: 1,140–1,200 °C followed by rapid water quench or forced-air cool. Aging at 760–870 °C enhances creep-rupture life for long-term service above 900 °C. Physical properties: density 8.36 g/cm³; melting range 1,330–1,410 °C; modulus of elasticity 211 GPa at 20 °C.
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