Principal Features

Vacuum-melted, nickel-based HAYNES® R-41 (UNS N07041) alloy has exceptionally high strength at temperatures in the range of 1200 to 1800°F (649 to 982°C). The alloy is a precipitation-hardening type
and strength is developed by various solution annealing and aging heat treatments. Because of its high
strength and good oxidation resistance, the alloy is being used in afterburner parts and nozzle
diaphragm partitions in current gas turbine engines. In the annealed condition, the alloy is ductile
and has essentially the same forming characteristics as 18-8 stainless steel and other nickel-based
alloys. It is stronger, however, and has a greater resistance to forming. The alloy has been formed
with success on drop hammers, expanding mandrels and stretch formers.  R-41 alloy is now being replaced in many applications by HAYNES® 282® alloy, due to the superior fabricability of 282® alloy.

Mechanical properties can be tailored by selecting various combinations of solution annealing and aging
treatments. In general, higher solution heat treating temperatures result in better room-temperature
ductility and improved formability. Stress-rupture strength is also improved by this type of
treatment. Lower solution annealing temperatures produce higher tensile strengths at temperatures up to about 1700°F (927°C). The effect of solution heat treating temperature can be seen in tensile and stress-rupture data.

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

Nominal Composition

Weight %
Nickel 52 Balance
Chromium 19
Cobalt 11
Molybdenum 10
Titanium 3.1
Aluminum 1.5
Silicon 0.5 max.
Manganese 0.1 max.
Carbon 0.09
Boron 0.006
Zirconium 0.07 max.

Physical Properties

Physical Property British Units Metric Units
Density 70°F
0.298 lb/in3
21°C
8.25 g/cm3
Melting Temperature 2250-2535°F - 1232-1391°C -
Mean Coefficient of Thermal Expansion 70-1000°F 7.5 µin/in -°F 21-538°C
13.5 x 10-6m/m·°C
70-1200°F 7.8 µin/in -°F 21-649°C
14.0 x 10-6m/m·°C
70-1400°F 8.2 µin/in -°F 25-760°C
14.8 x 10-6m/m·°C
70-1500°F 8.5 µin/in -°F 25-816°C
15.2 x 10-6m/m·°C
70-1600°F 8.8 µin/in -°F 25-871°C
15.7 x 10-6m/m·°C
70-1700°F 9.1 µin/in -°F 25-927°C
16.3 x 10-6m/m·°C
70-1800°F 9.4 µin/in -°F 25-982°C
16.8 x 10-6m/m·°C
Thermal Conductivity 300°F
80 Btu-in/ft2-hr-°F
149°C 11.5 W/m-°C
400°F
87 Btu-in/ft2-hr-°F
204°C 12.5 W/m-°C
500°F
95 Btu-in/ft2-hr-°F
260°C 13.6 W/m-°C
600°F
102 Btu-in/ft2-hr-°F
316°C 14.7 W/m-°C
800°F
117 Btu-in/ft2-hr-°F
427°C 16.8 W/m-°C
1000°F
131 Btu-in/ft2-hr-°F
538°C 18.8 W/m-°C
1100°F
139 Btu-in/ft2-hr-°F
593°C 20.0 W/m-°C
1200°F
146 Btu-in/ft2-hr-°F
649°C 21.0 W/m-°C
1300°F
153 Btu-in/ft2-hr-°F
704°C 22.0 W/m-°C
1400°F
161 Btu-in/ft2-hr-°F
760°C 23.1 W/m-°C
1500°F
168 Btu-in/ft2-hr-°F
816°C 24.1 W/m-°C
1600°F
175 Btu-in/ft2-hr-°F
871°C 25.1 W/m-°C
Specific Heat 70°F 0.108 Btu/lb.-°F 21°C 452 J/kg-°C
Electrical Resistivity  32°F  50.0 µohm-in  0°C  127.0 µohm-cm 
Magnetic Permeability 70°F <1.002 at 200 oersteds 21°C <1.002 at 200 oersteds

Tensile Data

Tensile properties after heat treating at
2050°F (1121°C) /30 min./RAC + 1650°F (899°C) /4h/AC

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength 4D Elongation
°F °C ksi MPa ksi MPa %
RT RT 116.4 803 181.8 1253 20.5
400 204 109* 752* 174.2* 1201* 16.5*
800 427 109.1* 752* 161.6* 1114* 20.3*
1000 538 107.2 739 161 1110 21.2
1200 649 107.7 743 172.9 1192 19.3
1400 760 114.3 788 139.1 959 28.3
1500 816 104* 717* 115.7* 798* 27.2*
1600 871 79.7 550 89.2 615 28.5
1700 927 59.1* 407* 66.9* 461* 24.8*
1800 982 34.2 236 40.2 277 31.1
2000 1093 4.9* 34* 8.5* 59* 94.4*

*Limited data

Tensile properties after heat treating at 1400°F (760°C) /16h/AC

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength 4D Elongation
°F °C ksi MPa ksi MPa %
RT RT 154.3 1064 205.4 1416 22.3
400 204 141.2* 974* 198.2* 1367* 23.0*
800 427 141.8* 978* 181.6* 1252* 25.6*
1000 538 139.8 964 182.6 1259 20.5
1200 649 138.3 954 196.2 1353 23.4
1400 760 126.1 869 150.8 1040 17.9
1500 816 112.2 774 128.1 883 19.4
1600 871 83.9 578 98.5 679 31.4
1700 927 51.1 352 62.3 430 38.7
1800 982 25.9 179 34.5 238 42.7

*Limited data

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

Aged Hardness

Age Hardened Room Temperature Hardness

Form Hardness Heat Treatment
Sheet 35 HRC 2050F, 30 Min, AC + 1650F, 4 Hr, AC
Plate 36 HRC 2050F, 30 Min, AC + 1650F, 4 Hr, AC
Sheet 42 HRC 1400F, 16 Hr, AC
Plate 39 HRC 1400F, 16 Hr, AC

HRC = Hardness Rockwell “C”

Creep-Rupture

HAYNES® R-41 Sheet, Age-Hardened*

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
100h 1,000h
°F °C % ksi MPa ksi MPa
1200 649 1 105 724 84 579
R 110 758 90 621
1300 704 1 75 517 59 407
R 85 586 68 469
1400 760 1 53 365 34 234
R 63 434 43 296
1500 816 1 32 221 18 124
R 39 269 24 165
1600 871 1 17 117 9.0 62
R 23 159 13 90
1700 927 1 8.4 58 4.6 32
R 13 90 6.5 45

*Samples were age hardened by heat treating at 2050°F (1121°C) /30 min./RAC + 1650°F (899°C) /4h/AC

Thermal Stability

Baseline Tensile Properties at RT and ET; Residual Tensile Properties at
Room Temperature and Exposure Temperature

Condition Test Temperature 0.2% Yield Strength Ultimate Tensile Strength 4D Elongation
°F °C ksi MPa ksi MPa %
Solution Annealed RT RT 83.6 576 151.4 1044 38.7
Age Hardened* RT RT 116.8 805 178.6 1231 17.3
1200 649 103.1 711 169.6 1169 18.0
1400 760 111.6 769 138.2 953 28.4
1500 816 100.6 694 113.5 783 32.0
1600 871 78.1 538 87.9 606 30.0
Age Hardened* + 1200°F/8000h RT RT 150.7 1039 188.5 1300 5.3
1200 649 129.7** 894** 182.6 1259 8.1**
Age Hardened* + 1400°F/8000h RT RT 151.6** 1045** 173.9** 1199** 0.1
1400 760 88.2 608 126.8 874 30.1**
Age Hardened* + 1500°F/8000h RT RT 113.5 783 156.6 1080 1.4
1500 816 58.2 401 88.5 610 26.8
Age Hardened* + 1600°F/8000h RT RT 83.3 574 122.9 847 2.0
1600 871 36.3 250 60.9 420 33.0

*Aged hardened at 2050°F (1121°C)/30 MAT/AC + 1650°F (899°C)/4H/AC
**Limited data

Elastic Modulus

Elasic Modulus, Shear Modulus, and Poisson’s Ratio

Test Temperature Modulus of Elasticity Shear Modulus Poisson's Ratio
°F °C
106 psi
GPa
106 psi
GPa
80 27 31.6 218 12 83 0.31
300 149 30.9 213 12 81 0.31
500 260 29.6 204 11 77 0.32
700 371 28.7 198 11 75 0.32
900 482 27.6 190 10 72 0.32
1000 538 27.2 188 - - -
1100 593 26.4 182 10 69 0.33
1200 649 25.9 179 - - -
1250 677 25.8 178 10 67 0.33
1400 760 24.8 171 9 64 0.33
1500 816 24.1 166 - - -
1550 843 23.7 163 9 61 0.34
1600 871 23.2 160 - - -
1700 927 21.8 150 8 55 0.35

Low Cycle Fatigue

Comparative Low-Cycle Fatigue Data

Heat Treatment

Wrought HAYNES® R-41 alloy is furnished in the solution annealed condition unless otherwise specified. After component fabrication, the alloy would normally again be solution annealed at 1950°F – 2150°F (1066°C – 1177°C) for a time commensurate with section thickness and rapidly cooled or water-quenched for optimal properties. Following solution annealing, the alloy is given an age-hardening treatment to optimize the microstructure and induce age-hardening.  A variety of age hardening practices are used commercially, all of which include heat treating in the range of 1400°F – 1800°F (760°C – 982°C).  For example, AMS 5545 specifies age hardening samples at 1400°F (760°C) for a minimum of 16 hours and air cooling.

Fabrication

Solution Annealed Room Temperature Hardness

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

HRBW = Hardness Rockwell “B”, Tungsten Indentor.
HRC = Hardness Rockwell “C”.

R-41, Solution Annealed, Room Temperature Tensile

Form Test Temperature 0.2% Yield Strength Ultimate Tensile Strength 4D Elongation
°F °C ksi MPa ksi MPa %
Sheet RT RT 84.2 581 148.1 1021 44.7
Plate RT RT 101.0 696 195.0 1344 38.8

For welding HAYNES® R-41 alloy, please review the General Welding and Joining Guidelines. In addition to those guidelines, there are some additional considerations when welding R-41 alloy.

HAYNES® R-41 alloy is a precipitation-strengthened alloy and requires a postweld heat treatment (PWHT) to develop suitable properties.  Postweld heat treatment for R-41 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 R-41 alloy to itself.  For filler metal suggestions for welding R-41 alloy to other alloys, please refer to the Haynes Welding SmartGuide,or contact Haynes International for further guidance.

Specifications and Codes

Specifications

HAYNES® R-41 alloy (N07041)
Sheet, Plate & Strip AMS 5545
Billet, Rod & Bar AMS 5712
Coated Electrodes -
Bare Welding Rods & Wire AMS 5800
Seamless Pipe & Tube -
Welded Pipe & Tube -
Fittings -
Forgings AMS 5712
DIN -
Others -

Codes

HAYNES® R-41 alloy (N07041)
MMPDS  6.3.7

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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