Alloy C-263, 2.4650, UNS N07263, Nimonic® alloy 263, Haynes® 263 - nickel alloy according to DIN 17750, AMS 5886
Table of contents:
Standard | Grade | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chemical composition % | ||||||||||||||||||
Ni: | Co: | Cr: | Mo: | Ti: | C: | Al: | Mn: | Si: | S: | P: | Fe: | Cu: | Pb: | Ag: | B: | Bi: | Al+Ti | |
ASTM / UNS | Alloy C-263 / UNS N07263 | |||||||||||||||||
Balance | 19.0-21.0 | 19.0-21.0 | 5.6-6.1 | 1.9-2.4 | 0.04-0.08 | <0.6 | <0.6 | <0.4 | <0.007 | <0.015 | <0.7 | <0.2 | <0.002 | <0.0005 | <0.005 | <0.0001 | 2.4-2.8 | |
Haynes® | Haynes® 263 alloy | |||||||||||||||||
Balance | 20.0 | 20.0 | 6.0 | <2.4 | <0.06 | <0.6 | <0.4 | <0.2 | - | - | - | - | - | - | <0.005 | - | <2.6 | |
DIN | 2.4650 / NiCr20Co18Ti | |||||||||||||||||
Balance | 19.0-21.0 | 19.0-21.0 | 5.6-6.1 | 1.9-2.4 | 0.04-0.08 | <0.6 | <0.6 | <0.4 | <0.007 | <0.015 | <0.7 | <0.2 | <0.002 | <0.0005 | <0.005 | <0.0001 | 2.4-2.8 | |
BS | BS HR10 / HR206 / HR404 | |||||||||||||||||
Balance | 19.0-21.0 | 19.0-21.0 | 5.6-6.1 | 1.9-2.4 | 0.04-0.08 | <0.6 | <0.6 | <0.4 | <0.007 | <0.015 | <0.7 | <0.2 | <0.002 | <0.0005 | <0.005 | <0.0001 | 2.4-2.8 | |
ISO | NW7263 / NiCr20Cr20Mo5Ti2Al | |||||||||||||||||
Balance | 19.0-21.0 | 19.0-21.0 | 5.6-6.1 | 1.9-2.4 | 0.04-0.08 | <0.6 | <0.6 | <0.4 | <0.007 | <0.015 | <0.7 | <0.2 | <0.002 | <0.0005 | <0.005 | <0.0001 | 2.4-2.8 |
Alloy C-263, 2.4650, UNS N07263, Nimonic® alloy 263 – description
Alloy C-263 (UNS N07263) is a high-temperature, precipitation-hardened, creep-resistant Ni-Cr-Co-Mo alloy. It is supplied in the annealed condition. It is recommended for service temperatures up to 850°C, but it resists oxidation up to 1000°C. It is easily weldable (no susceptibility to post-weld heat treatment cracking), has good fabrication characteristics, good wear resistance, and does not exhibit intermediate temperature tensile ductility.
Applications
Alloy C-276 is used in aero and industrial gas turbines for low-temperature combustion chambers, transition liners, exhaust cones and rings.
Physical and Tensile Properties
Room temperature physical properties:
- Density: 8.4 g/cm3
- Melting temperature: 1300-1360 °C
- Magnetic permeability: <1.001
High-Temperature Coefficient of Thermal Expansion, from 20°C to:
- 100°C: 10.7 μm/m⋅K
- 200°C: 12.0 μm/m⋅K
- 300°C: 12.5 μm/m⋅K
- 400°C: 13.0 μm/m⋅K
- 500°C: 13.5 μm/m⋅K
- 600°C: 14.1 μm/m⋅K
- 700°C: 14.9 μm/m⋅K
- 800°C: 15.9 μm/m⋅K
- 900°C: 17.2 μm/m⋅K
- 1000°C: 18.2 μm/m⋅K
Thermal Conductivity:
- 20°C: 11.7 W/m · K
- 100°C: 13.0 W/m · K
- 200°C: 14.7 W/m · K
- 300°C: 16.3 W/m · K
- 400°C: 18.0 W/m · K
- 500°C: 19.7 W/m · K
- 600°C: 21.4 W/m · K
- 700°C: 23.0 W/m · K
- 800°C: 24.7 W/m · K
- 900°C: 26.8 W/m · K
- 1000°C: 28.5 W/m · K
Electrical Resistivity:
- 20°C: 1.15 μΩ·m
- 100°C: 1.17 μΩ·m
- 200°C: 1.18 μΩ·m
- 300°C: 1.2 μΩ·m
- 400°C: 1.22 μΩ·m
- 500°C: 1.24 μΩ·m
- 600°C: 1.26 μΩ·m
- 700°C: 1.26 μΩ·m
- 800°C: 1.25 μΩ·m
- 900°C: 1.24 μΩ·m
- 1000°C: 1.24 μΩ·m
Specific Heat Capacity:
- 20°C: 426 J/kg⋅K
- 100°C: 447 J/kg⋅K
- 200°C: 472 J/kg⋅K
- 300°C: 497 J/kg⋅K
- 400°C: 523 J/kg⋅K
- 500°C: 548 J/kg⋅K
- 600°C: 573 J/kg⋅K
- 700°C: 598 J/kg⋅K
- 800°C: 624 J/kg⋅K
- 900°C: 649 J/kg⋅K
- 1000°C: 674 J/kg⋅K
Young's Modulus:
- 20°C: 222 GPa
- 100°C: 218 GPa
- 200°C: 212 GPa
- 300°C: 206 GPa
- 400°C: 198 GPa
- 500°C: 192 GPa
- 600°C: 184 GPa
- 700°C: 176 GPa
- 800°C: 165 GPa
- 900°C: 153 GPa
- 1000°C: 143 GPa
High-Temperature Mechanical Properties of alloy C-263 bars:
- 20°C:
- Yield strength: 585 MPa
- Tensile strength: 1004 MPa
- Elongation: 45 %
- Reduction of area: 41 %
- 100°C:
- Yield strength: 550 MPa
- Tensile strength: 958 MPa
- Elongation: 44 %
- Reduction of area: 44 %
- 200°C:
- Yield strength: 520 MPa
- Tensile strength: 911 MPa
- Elongation: 44 %
- Reduction of area: 47 %
- 300°C:
- Yield strength: 505 MPa
- Tensile strength: 880 MPa
- Elongation: 45 %
- Reduction of area: 50 %
- 400°C:
- Yield strength: 490 MPa
- Tensile strength: 849 MPa
- Elongation: 46 %
- Reduction of area: 51 %
- 500°C:
- Yield strength: 500 MPa
- Tensile strength: 834 MPa
- Elongation: 46 %
- Reduction of area: 52 %
- 600°C:
- Yield strength: 490 MPa
- Tensile strength: 819 MPa
- Elongation: 43 %
- Reduction of area: 50 %
- 700°C:
- Yield strength: 495 MPa
- Tensile strength: 772 MPa
- Elongation: 27 %
- Reduction of area: 34 %
- 800°C:
- Yield strength: 460 MPa
- Tensile strength: 587 MPa
- Elongation: 15 %
- Reduction of area: 26 %
- 900°C:
- Yield strength: 145 MPa
- Tensile strength: 232 MPa
- Elongation: 34 %
- Reduction of area: 58 %
- 1000°C:
- Yield strength: 70 MPa
- Tensile strength: 108 MPa
- Elongation: 69 %
- Reduction of area: 72 %
High-Temperature Mechanical Properties of alloy C-263 sheets:
- 20°C:
- Yield strength: 580 MPa
- Tensile strength: 973 MPa
- Elongation: 39 %
- 100°C:
- Yield strength: 515 MPa
- Tensile strength: 896 MPa
- Elongation: 40 %
- 200°C:
- Yield strength: 500 MPa
- Tensile strength: 849 MPa
- Elongation: 41 %
- 300°C:
- Yield strength: 475 MPa
- Tensile strength: 834 MPa
- Elongation: 42 %
- 400°C:
- Yield strength: 470 MPa
- Tensile strength: 816 MPa
- Elongation: 43 %
- 500°C:
- Yield strength: 490 MPa
- Tensile strength: 803 MPa
- Elongation: 43 %
- 600°C:
- Yield strength: 490 MPa
- Tensile strength: 788 MPa
- Elongation: 41 %
- 700°C:
- Yield strength: 475 MPa
- Tensile strength: 757 MPa
- Elongation: 23 %
- 800°C:
- Yield strength: 440 MPa
- Tensile strength: 556 MPa
- Elongation: 20 %
- 900°C:
- Yield strength: 135 MPa
- Tensile strength: 201 MPa
- Elongation: 49 %
- 1000°C:
- Yield strength: 70 MPa
- Tensile strength: 108 MPa
- Elongation: 65 %
Stress Rupture requirements:
- 650°C, 100h: 531 MPa
- 650°C, 1000h: 441 MPa
- 705°C, 100h: 414 MPa
- 705°C, 1000h: 310 MPa
- 760°C, 100h: 290 MPa
- 760°C, 1000h: 193 MPa
- 815°C, 100h: 172 MPa
- 815°C, 1000h: 103 MPa
- 870°C, 100h: 97 MPa
- 870°C, 1000h: 51 MPa
- 930°C, 100h: 50 MPa
- 930°C, 1000h: 28 MPa
Creep Resistance - stress to produce 1% creep:
- 650°C, 100h: 517 MPa
- 650°C, 1000h: 400 MPa
- 705°C, 100h: 372 MPa
- 705°C, 1000h: 283 MPa
- 760°C, 100h: 255 MPa
- 760°C, 1000h: 172 MPa
- 815°C, 100h: 152 MPa
- 815°C, 1000h: 83 MPa
- 870°C, 100h: 76 MPa
- 870°C, 1000h: 41 MPa
- 930°C, 100h: 39 MPa
- 930°C, 1000h: 21 MPa
Thermal Stability - Ultimate tensile strength in a given temperature after staying in the temperature for the given time:
- 760°C, 0h: 689 MPa
- 760°C, 8000h: 577 MPa
- 815°C, 0h: 537 MPa
- 815°C, 8000h: 404 MPa
- 870°C, 0h: 341 MPa
- 870°C, 8000h: 176 MPa
Corrosion Resistance
Heat Resistance / High-Temperature Oxidation - good resistance up to 1000°C.
1008h long static oxidation test results (6 cycles per 168 h in flowing air):
- 870°C:
- Metal loss: 3 μm
- Average metal affected: 10 μm
- 925°C:
- Metal loss: 5 μm
- Average metal affected: 18 μm
- 980°C:
- Metal loss: 23 μm
- Average metal affected: 127 μm
The results of dynamic oxidation tests in the combustion gas (50 parts of air to 1 part of fuel) flowing at 0.3 mach. At the end of each 30 minutes cycle, samples were air cooled down to 260°C. In total, the samples spent 1000h in the combustion gas:
- 870°C:
- Metal loss: 36 μm
- Average metal affected: 102 μm
- 980°C:
- Metal loss: 318 μm
- Average metal affected: 409 μm
Weldability
Alloy 263 has improved weldability over alloy 80A. It can we welded with any common method. It is not susceptible to post-weld heat treatment cracking and heat-affected-zone cracking. The sources differ as to the pre-weld and post-weld heat treatment:
Haynes® 263 alloy datasheet says a post-weld heat treatment is required, and should consist of a solution anneal followed by an aging treatment.
Nimonic® alloy 263 datasheet states "a pre-weld heat treatment is not neccessary on age-hardened assemblies, but a subsequent age-hardening treatment is desirable after all salvage welding is completed. Materials will age in service if temperatures are above 750°C."
VDM Alloy C-263 datasheet says the material should be in the annealed condition before welding, and recommends diffusion annealing after welding.
Welding products: S NI 7263 / NiCo20Cr20MoTi, BS 2901 NA38, 2.4650
Heat Treatment, Working and Machining
Recommended work and heat treatment parameters:
- Hot working: 1170-950°C; water quench
- Solution-treatment: 1140-1160°C; rapid air cool / water quench
- Age-hardening: 785-815°C; 8h; air cool
- Intermediate annealing: 1070-1090°C; 4-6 min; air cool
- Homogenizing (treatment): 1150°C; 1h; air cool
During the final hot working operation, the temperature must not exceed 1120°C. The piece should be water-quenched.
We deliver this steel alloy as:
- Plates, strips and sheets according to AMS 5872, BS HR 206, AECMA PrEn 2203,2418, DIN 17750
- Bars, rods and forgings according to AMS 5886, BS HR 10, AECMA PrEn 2199,2201,2200, DIN 17752, DIN 17754
- Wires according to DIN 17753
- Pipes according to BS HR 404, DIN 17751, AECMA PrEn 2202
Replacements, equivalents and other designations:
AMS 5886, AMS 5966, Altemp 263, Nimonic® alloy 263, Nickelvac C-263, Udimet Ni90, Unitemp C-263, VDM Alloy C-263, Nicrofer 5120 CoTi, Haynes® 263, Alloy 263, Alloy C-263, N07263, 2.4650, NiCr20Co18Ti, BS HR 10, HR HR 206, BS HR 404, NW7263, NiCo20Cr20Mo5Ti2Al