Alloy 617, 2.4663, UNS N06617, Inconel® 617 - nickel alloy

Alloy 617, 2.4663, UNS N06617, Inconel® 617 - nickel alloy according to ASTM B166, DIN 17752.

Alloy 617, 2.4663, Inconel® 617 – description

Alloy 617 (UNS N06617/W.Nr. 2.4663a) is a solid-solution, strengthened, Ni-Cr-Co-Mo alloy with high-temperature strength, creep properties and oxidation resistance. It also has good resistance to high-temperature carburizing and nitriding environments.

Applications

Gas turbines, petrochemical and thermal processing, nitric acid production.

Alloy 617 - physical and mechanical properties

Room temperature physical properties:

• Density: 8.36 g/cm³
• Melting temperature: 1332-1380°C

High-temperature Coefficient of thermal expansion, from 20°C to:

• 200°C: 12.6 μm/m⋅K
• 300°C: 13.1 μm/m⋅K
• 400°C: 13.6 μm/m⋅K
• 500°C: 13.9 μm/m⋅K
• 600°C: 14.0 μm/m⋅K
• 700°C: 14.8 μm/m⋅K
• 800°C: 15.4 μm/m⋅K
• 900°C: 15.8 μm/m⋅K
• 1000°C: 16.3 μm/m⋅K

High-temperature Electrical resistivity:

• 20°C: 1.222 μΩ·m
• 300°C: 1.268 μΩ·m
• 400°C: 1.278 μΩ·m
• 500°C: 1.290 μΩ·m
• 600°C: 1.308 μΩ·m
• 700°C: 1.332 μΩ·m
• 800°C: 1.342 μΩ·m
• 900°C: 1.338 μΩ·m
• 1000°C: 1.378 μΩ·m

High-temperature Thermal conductivity:

• 20°C: 13.4 W/m · K
• 300°C: 17.7 W/m · K
• 400°C: 19.3 W/m · K
• 500°C: 20.9 W/m · K
• 600°C: 22.5 W/m · K
• 700°C: 23.9 W/m · K
• 800°C: 25.5 W/m · K
• 900°C: 27.1 W/m · K
• 1000°C: 28.7 W/m · K

High-temperature Specific heat capacity:

• 20°C: 419 J/kg⋅K
• 300°C: 490 J/kg⋅K
• 400°C: 515 J/kg⋅K
• 500°C: 536 J/kg⋅K
• 600°C: 561 J/kg⋅K
• 700°C: 586 J/kg⋅K
• 800°C: 611 J/kg⋅K
• 900°C: 636 J/kg⋅K
• 1000°C: 662 J/kg⋅K

High-temperature Tensile modulus:

• 20°C: 211 GPa
• 300°C: 194 GPa
• 400°C: 188 GPa
• 500°C: 181 GPa
• 600°C: 173 GPa
• 700°C: 166 GPa
• 800°C: 157 GPa
• 900°C: 149 GPa
• 1000°C: 139 GPa
• 1100°C: 129 GPa

High-temperature Shear modulus:

• 20°C: 81 GPa
• 300°C: 75 GPa
• 400°C: 72 GPa
• 500°C: 70 GPa
• 600°C: 66 GPa
• 700°C: 64 GPa
• 800°C: 61 GPa
• 900°C: 57 GPa
• 1000°C: 53 GPa
• 1100°C: 49 GPa

High-temperature Poisson's Ratio:

• 20-900°C: 0,3
• 1000°C: 0.31
• 1100°C: 0.32

Tensile properties of Inconel® 617 solutioned, hot-rolled plates:

• Yield strength: 322 MPa
• Tensile strength: 734 MPa
• Elongation: 62% %
• Hardness BHN: 172

Tensile properties of Inconel® 617 solutioned, hot-rolled rods:

• Yield strength: 318 MPa
• Tensile strength: 769 MPa
• Elongation: 56 %
• Hardness BHN: 181

Tensile properties of Inconel® 617 solutioned, cold-drawn tubes:

• Yield strength: 383 MPa
• Tensile strength: 758 MPa
• Elongation: 56 %
• Hardness BHN: 193

Tensile properties of Inconel® 617 solutioned, cold-drawn sheets:

• Yield strength: 351 MPa
• Tensile strength: 755 MPa
• Elongation: 58 %
• Hardness BHN: 173

Temperature stability - Inconel® 617 retains its ductility despite prolonged exposure to high temperature. KV impact strength of solutioned Inconel® 617 after given time of heating:

• No exposure: 232 J
• 595°C, 100h: 289 J
• 595°C, 1 000h: 302 J
• 595°C, 4 000h: 245 J
• 595°C, 8 000h: 133 J
• 595°C, 12 000h: 94 J
• 650°C, 100h: 259 J
• 650°C, 1 000h: 47 J
• 650°C, 3 640h: 47 J
• 650°C, 8 000h: 54 J
• 650°C, 12 000h: 52 J
• 705°C, 100h: 77 J
• 705°C, 1 000h: 65 J
• 705°C, 4 000h: 65 J
• 760°C, 100h: 76 J
• 760°C, 1 000h: 85 J
• 760°C, 4 000h: 84 J
• 760°C, 8 000h: 87 J
• 760°C, 12 000h: 91 J

High-temperature Allowable stress according to ASME SC VIII, Div. 1:

• 540°C: 106 MPa
• 650°C: 105 MPa
• 760°C: 45 MPa
• 815°C: 26 MPa
• 925°C: 9 MPa
• 980°C: 5 MPa

Creep-resistance of NiCr23Co12Mo alloy according to VdTUV WB485:06.2015:

• 10 000h
  • 600°C: 260 MPa
  • 650°C: 170 MPa
  • 700°C: 123 MPa
  • 750°C: 90 MPa
  • 800°C: 65 MPa
• 100 000h
  • 600°C: 190 MPa
  • 650°C: 125 MPa
  • 700°C: 95 MPa
  • 750°C: 65 MPa
  • 800°C: 43 MPa

Corrosion behaviour

High nickel, chromium, cobalt and molibdenum content with ~1% aluminum addition gives Alloy 617 very good oxidation resistance, as well as good carburization and nitridation resistance. The alloy has, however, the tendency to form internal aluminum nitrides in highly oxidizing combustion atmospheres.

Oxidation - very good resistance, as evident from following data.

1008h long static oxidation test results:

• 980°C:
  • Metal loss: 0.0075 mm
  • Average metal affected: 0.033 mm
• 1095°C:
  • Metal loss: 0.015 mm
  • Average metal affected: 0.046 mm
• 1150°C:
  • Metal loss: 0.028 mm
  • Average metal affected: 0.086 mm
• 1205°C:
  • Metal loss: 0.27 mm
  • Average metal affected: 0.32 mm

Dynamic oxidation resistance in high-velocity combustion gas stream test results (samples were cycled to less than 260°C once every 30 min):

• 500h, 1090°C:
  • Metal loss: 0.32 mm
  • Maximum metal affected: 0.61 mm, with internal aluminum nitrides through thickness
• 1000h, 980°C
  • Metal loss: 0.069 mm
  • Maximum metal affected: 0.27 mm

Results of cyclic oxidation tests at 1100°C for 504 h in high humidity (air-5H₂O):

• Weight change: 13.5 mg/cm²

High-temperature carburization - good resistance. 24 test in Ar-5H₂-5CO-5CH₄ at 1090°C resulted in carbon absorption of 11.5 mg/cm².

High-temperature nitridation - good resistance. This is confirmed by the following comparison of test results. In each, alloy 617 was exposed to ammonia for 168h.

• 650°C
  • Nitrogen absorption: 1.3 mg/cm²
  • Depth of nitride penetration: 0.03 mm
• 980°C
  • Nitrogen absorption: 1.5 mg/cm²
  • Depth of nitride penetration: 0.35 mm
• 1090°C
  • Nitrogen absorption: 1.9 mg/cm²
  • Depth of nitride penetration: >0.56 mm

Halogenation - good resistance. Descaled weight loss after 500 h of testing in high-temperature chlorine environment (Ar-30Cl₂):

• 400°C: 0.6 mg/cm²
• 500°C: 7 mg/cm²
• 705°C: 190 mg/cm²

Weldability

Alloy 617 has good weldability. It is included in weldability group 46 (ISO 15608) and 43 (ASME Section IX). It's brazing P-number is 111 (ASME Section IX).

Selection of welding consumables for Alloy 617

• Coated electrodes: ENiCrCoMo-1
• Filler metals: ERNiCrCoMo-1

Heat treatment, working and machining

Recommended working and heat treatment parameters:

• Heavy forging: 1205-1010 °C
• Light forging: 1205-925 °C
• Continuous soft-annealing: 1120-1175 °C; 30-60 min; air cool / water quench
• Batch soft-annealing in bell-type furnaces: 1120-1175 °C; 1-3 h; air cool
• Intermediate annealing: 1040 °C
• Solution-treatment according to ASME SB 176: 1140-1232 °C - to achieve austenit matrix without carbide precipitates.

Forging - good hot formability, but it requires relatively high forces because of its inherent strength at elevated temperatures.

Cold working usually require frequent intermediate anneals.

Machining - very difficult.

We deliver this steel alloy as:

• Rod, bar, wire, forging according to ASTM  B 166 / ASME SB-166, ASTM  B 564 / ASME SB-564, DIN 17752, DIN 17753, DIN 17754
• Plates, strips and sheets according to ASTM B 168 / ASME SB-168, DIN 17750, ISO 6208, VdTUV 485, AMS 5889, AMS 588
• Pipes according to VdTUV 485, DIN 17751, ISO 6207, ASTM B 546 / ASME SB-546

Replacements, equivalents and other designations:

Alloy 617, H06007, N06007, HNS3304, NS3402, W50276, 2.4663, NiCr23Co12Mo, BS NA 50, NW6007, NW6617, NiCr22Co12Mo9, NiCr22Fe20Mo6Cu2Nb, Haynes® 617, Inconel® 617, ASTM B166 (N06007) / ASME SB166 (N06007), ASTM B167 (N06007) / ASME SB167 (N06007), ASTM B168 (N06007) / ASME SB168 (N06007), ASTM B366 (CRHG) / ASME SB366 (CRHG), ASTM B366 (WPHG) / ASME SB366 (WPHG), ASTM B472 (N06007) / ASME SB472 (N06007), ASTM B546 (N06007) / ASME SB546 (N06007), ASTM B564 (N06007) / ASME SB564 (N06007), ASTM B581 (N06007) / ASME SB581 (N06007), ASTM B582 (N06007) / ASME SB582 (N06007), ASTM B619 (N06007) / ASME SB619 (N06007), ASTM B622 (N06007) / ASME SB622 (N06007), Nicrofer® 5520, Nicrofer® S5520, VDM® Alloy 617, VDM® FM 617, Phyweld® 617, SY 617 Arcelot Mittal, MTEK 617, bohler L617