Principal Features

Good High-Temperature Strength Up to 1650°F (900°C), Excellent Ductility, and Excellent Weldability

HAYNES® 263 alloy (UNS N07263) is an age-hardenable nickel-cobalt-chromium-molybdenum alloy developed specifically to combine good age-hardened strength properties with excellent fabrication characteristics in the annealed condition. HAYNES® 263 alloy exhibits excellent intermediate temperature tensile ductility, and is not normally subject to strain age cracking problems common for gamma prime strengthened alloys.  Its strength at elevated temperature is not quite as high as materials such as HAYNES® 282® alloy, Waspaloy alloy, or R-41 alloy.  However, it is much easier to form or weld than Waspaloy alloy and R-41 alloy.  Because HAYNES® 282® alloy exhibits superior tensile, creep-rupture, and low cycle fatigue strength than HAYNES® 263 alloy and has significantly greater fabricability than Waspaloy and R-41 alloys, it is replacing HAYNES® 263 alloy in many applications.

HAYNES® 263 alloy is normally used for applications up to about 1650°F (900°C). Its oxidation resistance is comparable to that for other gamma-prime-strengthened superalloys.

Applications

HAYNES® 263 alloy combines properties which make it suitable for a variety of fabricated component applications in both aircraft turbine engine and industrial turbine applications. These include low-temperature combustors, transition liners, and some ring components.

*Please contact our technical support team if you have technical questions about this alloy.

Nominal Composition

Weight %
Nickel Balance
Cobalt 20
Iron 0.70 max.
Chromium 20
Molybdenum 6
Manganese 0.40
Silicon 0.20
Aluminum 0.60 max.
Titanium 2.40 max.
Carbon 0.06
Boron 0.005 max.
Zirconium 0.04 max.
Aluminum + Titanium 2.60

Creep and Stress Rupture Strength

HAYNES® 263 Alloy Sheet, Age-Hardened*

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
100h 1,000h
°F °C % ksi MPa ksi MPa
1200 649 1 75 517 58 400
R 77 531 64 441
1300 704 1 54 372 41 283
R 60 414 45 310
1400 760 1 37 255 25 172
R 42 290 28 193
1500 816 1 22 152 12 83
R 25 172 15 103
1600 871 1 11 76 6.0 41
R 14 97 7.4 51
1700 927 1 5.7 39 3.0 21
R 7.3 50 4.0 28

*Samples were age hardened by treating at 1472°F (850°C)/8h/AC

Comparison of Stress to Produce 1% Creep in 1000 Hours in Sheet

At temperatures of 1200°F (649°C) and above, HAYNES® 263 alloy has creep strength less than those of two other gamma-prime strengthened alloys, HAYNES® 282® alloy and HAYNES® Waspaloy alloy.  At temperatures greater than 1300°F (704°C), HAYNES® 263 has a creep strength far superior to that of HAYNES® 718 alloy.

Thermal Stability

Condition Test Temperature 0.2% Yield Strength Ultimate Tensile Strength 4D Elongation
°F °C ksi MPa ksi MPa %
Solution Annealed RT RT 58 400 120.1 828 53.3
Age Hardened* RT RT 93.1 642 154.2 1063 36.9
1200 649 78.2 539 132.3 912 38.6
1400 760 79.2 546 100 689 29.5
1500 816 69.3 478 77.9 537 36.9
1600 871 42.2 291 49.4 341 61.2
Age Hardened* + 1200°F/8000h RT RT 113.3 781 176.8 1219 28.7
1200 649 96.7** 667** 149.2** 1029** 31.3**
Age Hardened* + 1400°F/8000h RT RT 83.3 574 151.3 1043 24.8
1400 760 60.9 420 83.7 577 36.4
Age Hardened* + 1500°F/8000h RT RT 77.5 534 132.8 916 23
1500 816 42 290 58.6 404 37
Age Hardened* + 1600°F/8000h RT RT 54.9 379 115.7 798 37.8
1600 871 38.4 265 25.5 176 49.1

* Samples were age hardened by treating at 1472°F for 8 hours and air cooling.
** Limited data

Tensile Properties

Cold-Rolled Sheet, Solution Treated and Aged

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 89.2 615 151.0 1041 35.8
400* 204* 82.3* 567* 139.6* 963* 40.9*
800* 427* 80.4* 554* 126.7* 874* 39.6*
1000 537 76.4 527 124.8 860 42.1
1200 649 75.2 518 130.7 901 36.9
1400 760 76.0 524 100.9 696 26.6
1500* 816* 68.2* 470* 77.3* 533* 35.2*
1600 871 43 296 50.5 348 58.1
1700 927 17.0 117 25.0 172 105.2
1800 982 12.3 85 17.9 123 95.1
2000 1093 5.5 38 9.0 62 103.6

* Limited data
Mill Annealed +1472°F/8h/Air Cool

Cold-Rolled Plate, Solution Treated and Aged

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 84.7 584 147.7 1018 30.4
400* 204* 74.5* 514* 139.6* 963* 34.2*
800* 427* 70.9* 489* 126.8* 874* 41.2*
1000 537 74.3 512 122.6 845 42.5
1200 649 71.8 495 125.8 867 32.7
1400 760 72.5 500 101.9 703 19.9
1500* 816* 64.1* 442* 81.8* 564* 22.8*
1600 871 45.2 312 53.2 367 47.5
1800 982 12.5 86 18.8 130 101.6
2000 1093 6 41 9.1 63 114.8

* Limited data
Mill Annealed +1472°F/8h/Air Cool

Aged Hardness

Age Hardened Room Temperature Hardness

Form Hardness
Sheet 26 HRC
Plate 27 HRC

Mill Annealed +1472°F/8h/Air Cool
HRC = Rockwell Hardness “C”

Oxidation Resistance

Static Oxidation Testing

Environment: Flowing Air
Test Duration: 1,008 h
Number of Cycles: 6
Cycle Length: 168 h
Temperatures: 1600, 1700, 1800°F (871, 927, 982°C)
Metal Loss = (A-B)/2
Average Internal Penetration = C
Maximum Internal Penetration = D
Average Metal Affected = Metal Loss + Average Internal Penetration
Maximum Metal Affected = Metal Loss + Maximum Internal Penetration

Comparative Oxidation Resistance in Flowing Air, 1008 Hours

Alloy 1600°F (871°C) 1700°F (927°C) 1800°F (982°C)
Metal Loss Avg. Met. Aff. Metal Loss Avg. Met. Aff. Metal Loss Avg. Met. Aff.
mils μm mils μm mils μm mils μm mils μm mils μm
263 0.1 3 0.4 10 0.2 5 0.7 18 0.9 23 5.0 127
282® 0.2 5 0.6 15 0.1 3 1.1 28 0.2 5 1.8 46
R‐41 0.2 5 0.8 20 0.2 5 1.5 38 0.2 5 2.9 74
Waspaloy 0.3 8 1.4 36 0.3 8 3.4 86 0.7 18 5.0 127

Dynamic Oxidation Testing (Burner Rig)

Burner rig oxidation tests were conducted by exposing, in a rotating holder, samples 0.375 inch x 2.5 inches x thickness (9.5mm x 64mm x thickness) to the products of combustion of fuel oil (2 parts No. 1 and 1 part No. 2), burned at an air to fuel ratio of about 50:1. The gas velocity was about 0.3 mach. Samples were automatically removed from the gas stream every 30 minutes and fan cooled to less than 500°F (260°C) and then reinserted into the flame tunnel.

Alloy 1600°F (871°C), 1000 hours, 30 minute cycles 1800°F (982°C), 1000 hours, 30 minute cycles
Metal Loss, Avg. Met. Aff. Metal Loss, Avg. Met. Aff.
mils μm mils μm mils μm mils μm
263 1.4 36 4.0 102 12.5 318 16.1 409
282® 1.8 46 4.2 107 8.0 203 13.0 330
Waspaloy 1.9 48 4.3 109 9.5 241 13.6 345
R‐41 1.2 30 4.4 112 5.8 147 12.1 307

Physical Properties

Physical Property Metric Units British Units
Density RT
0.302 lb/in3
RT
8.36 g/cm3
Melting Range 2370-2470°F 1300-1355°C
Electrical Resistivity RT 45.3 µohm-in RT 115 µohm-cm
200°F 45.8 µohm-in 100°C 116 µohm-cm
400°F 46.5 µohm-in 200°C 118 µohm-cm
600°F 47.5 µohm-in 300°C 120 µohm-cm
800°F 48.2 µohm-in 400°C 122 µohm-cm
1000°F 49.1 µohm-in 500°C 124 µohm-cm
1200°F 49.6 µohm-in 600°C 126 µohm-cm
1400°F 49.4 µohm-in 700°C 126 µohm-cm
1600°F 48.9 µohm-in 800°C 125 µohm-cm
1800°F 48.9 µohm-in 900°C 124 µohm-cm
- - 1000°C 124 µohm-cm
Thermal Conductivity RT
81 Btu-in/ft2-hr-°F
RT 11.7 W/m-°C
200°F
89 Btu-in/ft2-hr-°F
100°C 13.0 W/m-°C
400°F
103 Btu-in/ft2-hr-°F
200°C 14.7 W/m-°C
600°F
115 Btu-in/ft2-hr-°F
300°C 16.3 W/m-°C
800°F
128 Btu-in/ft2-hr-°F
400°C 18.0 W/m-°C
1000°F
141 Btu-in/ft2-hr-°F
500°C 19.7 W/m-°C
1200°F
154 Btu-in/ft2-hr-°F
600°C 21.4 W/m-°C
1400°F
167 Btu-in/ft2-hr-°F
700°C 23.0 W/m-°C
1600°F
182 Btu-in/ft2-hr-°F
800°C 24.7 W/m-°C
1800°F
195 Btu-in/ft2-hr-°F
900°C 26.8 W/m-°C
- - 1000°C 28.5 W/m-°C
Mean Coefficient of Thermal Expansion 70-200°F 6.2 µin/in-°F 25-100°C 11.1 µm/m- °C
70-400°F 6.7 µin/in-°F 25-200°C 12.1 µm/m- °C
70-600°F 7.1 µin/in-°F 25-300°C 12.7 µm/m- °C
70-800°F 7.2 µin/in-°F 25-400°C 12.8 µm/m- °C
70-1000°F 7.6 µin/in-°F 25-500°C 13.6 µm/m- °C
70-1200°F 7.9 µin/in-°F 25-600°C 13.9 µm/m- °C
70-1400°F 8.3 µin/in-°F 25-700°C 14.7 µm/m- °C
70-1600°F 9.0 µin/in-°F 25-800°C 15.4 µm/m- °C
70-1800°F 9.9 µin/in-°F 25-900°C 17.0 µm/m- °C
- - 25-1000°C 18.1 µm/m- °C
Dynamic Modulus of Elasticity RT
32.1 x 106 psi
RT 221 GPa
200°F
31.7 x 106 psi
100°C 219 GPa
400°F
30.7 x 106 psi
200°C 212 GPa
600°F
29.6 x 106 psi
300°C 205 GPa
800°F
28.5 x 106 psi
400°C 198 GPa
1000°F
27.5 x 106 psi
500°C 192 GPa
1200°F
26.2 x 106 psi
600°C 185 GPa
1400°F
24.8 x 106 psi
700°C 176 GPa
1600°F
22.9 x 106 psi
800°C 166 GPa
1800°F
21.1 x 106 psi
900°C 154 GPa
- - 1000°C 143 GPa

RT= Room Temperature

Low Cycle Fatigue

Comparative Low-Cycle Fatigue Data

Fabrication and Welding

Fabrication

HAYNES® 263 alloy has excellent forming and welding characteristics. The hot working temperature range for the alloy is approximately 1750 to 2150°F (954- 1177°C). The alloy has excellent ductility in the annealed condition, and thus may also be formed by cold working. Intermediate annealing in the temperature range from 1900 to 2000°F (1038 to 1093°C) may be needed for complex component forming operations. All hot- or cold-worked parts should be annealed and rapidly cooled in order to restore the best balance of properties.

Welding

For welding HAYNES® 263 alloy, please review the General Welding and Joining Guidelines. In addition to those guidelines, there are some additional considerations when welding 263 alloy.

HAYNES® 263 alloy is a precipitation-strengthened alloy and requires a postweld heat treatment (PWHT) to develop suitable properties.  Postweld heat treatment for 263 alloy consists of two parts: a solution anneal, which is followed by a suitable aging treatment.  Details can be found here.  During PWHT, the gamma-prime phase (Ni3Al,Ti) precipitates and the alloy undergoes a slight volumetric contraction.  This makes it susceptible to strain-age cracking, which typically occurs upon heating to the solution annealing temperature.  To inhibit strain-age cracking, the heating rate to the solution annealing temperature should be as fast as possible, within the capability of the furnace being used.

Filler metal of matching composition is suggested for welding 263 alloy to itself.  For filler metal suggestions for welding 263 alloy to other alloys, please refer to the Haynes Welding SmartGuide, or contact Haynes International for further guidance.

Tensile Properties of Solution Annealed 263 at Room Temperature

Ultimate Tensile Strength Yield Strength Elongation
ksi MPa ksi MPa %
Sheet 116.9 806 49.1 339 57.5
Plate 115.6 797 47.7 329 59.3

Solution Annealed Room Temperature Hardness

Form Hardness Typical ASTM Grain Size
Sheet 98 HRBW 5 – 7.5
Plate 31 HRC 4 – 6

All samples tested in solution-annealed condition.
HRBW = Hardness Rockwell “B”, Tungsten Indentor.
HRC = Hardness Rockwell “C”.

Heat Treatment

Wrought HAYNES® 263 alloy is furnished in the solution heat-treated condition unless otherwise specified. The alloy is normally solution heat-treated in the range of 1900 – 2150°F (1038 – 1177°C) and rapidly cooled or water quenched for optimal properties. Following solution heat treatment, the alloy is age-hardened at 1475°F (802°C) for eight hours, and air-cooled.

Specifications

Specifications

HAYNES® 263 alloy (N07263)
Sheet, Plate & Strip AMS 5872
Biller, Rod & Bar AMS 5886
Coated Electrodes
Bare Welding Rods & Wire AMS 5966
Seamless Pipe & Tube
Welded Pipe & Tube
Fittings
Forgings AMS 5886
DIN
Others

Disclaimer

Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums.  It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.

For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc.  All trademarks are owned by Haynes International, Inc., unless otherwise indicated.

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