Principal Features

HASTELLOY® N alloy (UNS N10003) is a nickel-base alloy that was invented at Oak Ridge National Laboratories as a container material for molten fluoride salts. It has good oxidation resistance to hot fluoride salts in the temperature range of 1300 to 1600°F (704 to 871°C).

In tests of over two years duration, corrosion attack on HASTELLOY® N alloy in molten fluoride salts at temperatures up to 1300°F (704°C), was less than one mil per year. It is expected that alloy N will be most useful in environments involving fluorides at high temperatures; however, the alloy compares favorably with other HASTELLOY® alloys in various corrosive media, as shown in the table of penetration rates. Corrosion test samples of the alloy are available from Haynes International locations. It is especially suggested that the alloy be tested in molten halides of zirconium, beryllium, lithium, sodium, potassium, thorium or uranium.

HASTELLOY® N alloy has good oxidation resistance in air. It shows promise for continuous operations at temperatures up to 1800°F (982°C). Intermittent use at temperatures up to 1900°F (1038°C) may also be possible. No discernible oxidation could be measured for the alloy at temperatures up to 1200°F (649°C).

Metallographic examinations have shown that the elements in alloy N remain in solid solution in the 1100 to 1600°F (593 to 871°C) range. Tensile tests have indicated no tendency toward embrittlement for prolonged periods at 1500°F (816°C). Alloy N has good weldability and can be readily forged. The hot working range is between 1600 and 2150°F (871 to 1177°C). It has been successfully extruded and further processed into high-quality seamless or manufactured as welded and drawn tubing.

Solution heat-treatment is recommended after hot or cold working of HASTELLOY® N alloy parts. For sheet and plate, this is accomplished by soaking at 2150°F (1177°C) [sections up to 1/4 inch thick] and then cooling rapidly in air, or at 2165°F (1185°C) [sections 1/4 inch and thicker] followed by waterquenching.

HASTELLOY® N alloy can be supplied, to order, in the forms of sheet, plate, and bar

HASTELLOY® N alloy sheet, plate, bar, rod, and welded and seamless wrought pipe and tubing have been approved for use in the construction of unfired pressure vessels in accordance with the requirements of the ASME Boiler and Pressure Vessel Code Section VIII under Case 1315 (Special Ruling). Alloy N is approved for use at temperatures up to 1300°F (704°C).

The properties data listed are typical or average values and should not be interpreted as guaranteed values except where so stated.

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

Nominal Composition

Weight %
Nickel 71 Balance
Chromium 7
Molybdenum 16
Iron 4 max.
Silicon 1 max.
Manganese 0.8 max.
Vanadium: 0.5 max.
Carbon 0.06
Cobalt 0.2 max.
Copper 0.35 max.
Tungsten 0.5 max.
Aluminum + Titanium 0.5 max

Oxidation Resistance

Temperature
Weight Gain*, mg./cm2
Shape of Rate Curve
°F °C 100 h 1000 h -
1200 649 0.00 0.00 Cubic or Logarithmic
1600 871 0.25 0.67** Cubic
1800 982 0.48 1.5** Parabolic
1900 1038 0.52 2.0** Parabolic
2000 1093 2.70 28.2** Linear

3.7mg./cm2=0.001 inch of oxidation
** Extrapolated from data obtained after 170 hours at temperature

Average Room Temperature Hardness

Form Condition Aging Form
Sheet Heat-treated at 2150°F (1177°C), RAC °F h -
- - 96
1500 4 92
1500 8 97
1500 16 96
1500 32 97
1500 64 99
1500 128 96

HRB = Hardness Rockwell “B”, Tungsten Indentor.

Average Stress-Rupture Data

Form Test Temperature Stress Life Elongation Reduction of Area
Sheet °F °C psi h % %
1100 593 80,000 0.4 44.0 31.6
60,000 38.9 21.0 19.4
55,000 87.7 17.4 16.9
1300 704 35,000 18.6 11.8 11.0
25,000 129.6 26.5 10.3
20,000 338.6 12.6 9.0
1500 816 15,000 19.0 15.4 9.6
10,000 78.6 13.8 9.5
8,000 172.2 18.4 10.1
1700 927 6,000 24.3 21.0 21.4
4,000 75.5 19.3 11.5
3,000 219.6 28.0 11.5

Average Rupture Data, Weld Metal

Test Temperature Stress Average Rupture time, h Average Elongation %
°F °C psi As Welded
Stress Relieved1
Stress Relieved1
1100 593 - - Hydrogen Argon Hydrogen Argon
74,000 1.3 1.7 - 14.1 -
54,000 197.8 188.3 - 2.5 -
49,000 308.4 570.5 - 2.2 -
1300 704 45,000 3.7 6.4 5.5 3.9 5.4
24,000 158.4 337.8 185.4 3.7 7.4
20,000 472.3 936.7 4522.0 4.6 3.7
1500 816 22,000 12.7 12.1 - 16.9 -
13,000 172.1 117.5 - 14.4 -
10,000 446.9 314.5 - 8.3 -

1Stress-relieved at 1600°F for 2 hrs. in atmosphere specified

Total Elongation

0.063 – in. SHEET

HASTELLOY® N alloy Total Elongation

Test Temperature Stress Life Time, Hours, for Elongation of
°F °C psi h 0.1% 0.2% 0.3% 0.4% 0.5% 0.75% 1.0% 1.5% 2.0% 3.0% 4.0% 5.0%
1300 704 20,000 285.5 0.29 15.0 26.9 33.7 40.5 57.0 70.5 96.8 121.7 168.7 209.5 245.5
20,000 277.4 20.2 52.4 58.9 65.4 72.0 87.8 103.4 133.0 160.0 207.1 219.4 -
20,000 462.9 0.86 16.2 29.4 46.6 50.2 62.0 73.7 96.7 141.7 225.5 326.9 369.9
20,000 328.6 1.1 7.3 15.3 23.1 30.7 50.0 64.8 94.0 123.0 178.2 223.9 265.5
25,000 109.6 - 0.14 1.14 2.43 5.14 7.74 10.3 15.4 20.6 41.2 60.6 78.6
25,000 165.9 - 3.9 12.8 20.2 26.5 37.4 47.9 64.7 80.3 109.8 133.8 -
25,000 116.9 - 1.9 5.63 9.5 13.2 22.8 28.5 37.4 46.4 63.1 78.6 91.9
25,000 125.8 - 6.6 10.9 15.2 19.6 30.3 36.0 47.0 57.2 82.4 116.3 -
35,000 19.0 - - - - - - - 0.62 4.78 - - -
35,000 16.9 - - - - - - 0.38 3.7 - - - -
35,000 23.3 - - - - - - - 3.0 5.9 - - -
35,000 15.1 - - - - - - - - 1.4 4.4 - -
1500 816 8,000 157.7 2.34 7.31 11.6 16.0 20.4 29.7 37.7 53.4 69.4 95.4 116.8 132.4
8,000 136.8 0.9 4.4 7.8 11.5 15.2 24.4 30.7 43.0 55.8 78.9 97.3 110.7
8,000 210.0 0.75 3.7 7.0 10.6 14.2 23.5 31.1 46.1 59.2 89.5 114.4 136.2
8,000 184.6 0.75 4.0 8.1 12.9 17.8 28.5 37.5 55.3 73.3 103.2 128.6 145.1
10,000 80.2 0.67 3.8 7.0 8.4 9.4 13.3 16.8 23.8 28.3 38.4 47.3 56.8
10,000 64.3 1.3 3.3 5.0 6.47 7.8 11.2 - - - - - -
10,000 86.5 1.58 4.17 6.5 9.3 10.4 15.3 20.2 28.8 36.6 51.6 62.5 73.5
10,000 83.4 1.17 3.7 6.0 8.0 9.7 14.1 18.5 25.9 32.0 44.1 56.2 68.2
15,000 19.8 0.15 0.73 1.02 1.55 1.94 2.9 3.85 5.76 - - - -
15,000 19.7 0.27 1.1 1.84 2.21 2.45 3.15 3.82 - - - - -
15,000 20.9 - - 0.2 0.48 0.76 1.53 2.32 3.9 5.5 - - -
15,000 15.5 - 0.54 1.06 1.32 1.57 2.27 2.95 4.3 5.7 - - -
1700 927 3,000 297.7 1.67 7.5 13.1 18.7 24.3 38.7 53.0 78.4 97.8 130.1 155.2 176.0
3,000 155.6 2.3 5.3 7.9 10.3 13.1 19.8 26.5 39.7 53.0 76.6 93.2 106.8
3,000 237.5 2.14 5.54 8.8 11.7 14.6 22.0 29.4 44.0 58.7 83.4 102.9 119.0
3,000 187.5 1.72 4.41 6.97 9.9 12.9 20.4 28.0 42.9 58.0 85.4 103.9 118.3
4,000 69.0 0.18 0.55 0.9 1.25 1.6 3.67 6.53 12.1 17.8 28.6 - -
4,000 62.7 0.25 0.88 1.47 2.11 3.66 7.21 10.2 15.9 21.7 - - -
4,000 87.0 1.54 3.85 6.0 7.8 9.1 14.4 18.9 28.0 34.8 48.2 58.6 66.8
4,000 83.1 0.6 2.47 5.1 7.51 8.95 12.6 16.6 23.6 - - - -
6,000 23.4 0.26 0.7 1.1 1.5 1.9 2.8 3.67 5.23 6.25 8.3 10.3 12.3
6,000 22.5 0.12 0.5 0.81 1.13 1.45 2.24 4.53 5.9 - - - -
6,000 17.5 0.13 0.57 0.9 1.2 1.47 2.2 2.9 4.25 5.5 - - -
6,000 33.9 0.28 0.8 1.41 2.0 2.64 4.2 5.7 8.4 11.2 16.6 22.1 26.1

Comparative Aqueous Corrosion Data mm y

Chemical Concentration Temperature Corrosion Rates (mpy)
- wt. % °F °C N B-2 C-22® W
Hydrochloric Acid 2 RT RT 1 < 1 < 1 -
2 150 66 18 11 < 1 10
2 Boiling Boiling 73 3 61 -
5 RT RT 1 < 1 < 1 -
5 150 66 20 9 17 14
15 RT RT 3 2 < 1 -
25 RT RT 2 1 2 -
37 RT RT < 1 < 1 2 -
Sulfuric Acid 5 RT RT 1 < 1 < 1 -
5 150 66 11 6 < 1 3
5 Boiling Boiling 11 3 9 1
25 RT RT 1 < 1 < 1 -
25 150 66 10 5 < 1 3
50 RT RT < 1 < 1 < 1 -
80 RT RT < 1 < 1 < 1 -
96 RT RT < 1 < 1 < 1 -
Ferric Chloride 2 RT RT 1 138 < 1 158
Phosphoric Acid 10 RT RT < 1 < 1 < 1 -
10 150 66 1 3 < 1 -
10 Boiling Boiling 6 1 < 1 14
30 RT RT 1 < 1 < 1 -
30 150 66 1 2 < 1 -
50 RT RT < 1 < 1 < 1 -
85 RT RT < 1 < 1 < 1 -
Hydrofluoric Acid 5 RT RT 2 < 1 < 1 1
5 175 79 20 11 15 -
25 RT RT 3 5 5 3
45 RT RT 5 3 6 3
48 175 79 31 25 27 -
Acetic Acid 10 RT RT 1 < 1 < 1 -
10 150 66 3 < 1 < 1 2
10 Boiling Boiling 1 < 1 < 1 -
50 RT RT 1 < 1 < 1 -
50 150 66 3 < 1 < 1 2
50 Boiling Boiling 2 < 1 < 1 -
99 RT RT < 1 < 1 < 1 -
99 150 66 < 1 < 1 < 1 < 1
99 Boiling Boiling < 1 < 1 < 1 -

RT= Room Temperature

Average Fatigue Data

Rotating

Form Condition Test Temperature
Stress for Failure in 106 Cycles:
Sheet Heat-treated at 2150°F (1177°C), RAC 1100 °F 47,500 psi
1300 °F 38,000 psi
1500 °F 23,000 psi

Boiler Code Design Data

Metal Temperature Not Exceeding Maximum Allowable Stress Values, psi All Material Other Than Boiling Boiling
°F °C - -
100 38 25,000 10,000
200 93 24,000 9,300
300 149 23,000 8,600
400 204 21,000 8,000
500 260 20,000 7,700
600 316 20,000 7,500
700 371 19,000 7,200
800 427 18,000 7,000
900 482 18,000 6,800
1000 538 17,000 6,600
1100 593 13,000 6,000
1200 649 6,000 3,500
1300 704 3,500 1,600

Physical Properties

Physical Property British Units Metric Units
Density RT
0.320 lb./in.3
RT
8.86 g/cm3
Melting Range 2375-2550°F - 1300-1400°C -
Thermal Conductivity 400°F
89 Btu-in./ft.2-hr.-°F
200°C 13.1 W/m-ºC
600°F
101 Btu-in./ft.2-hr.-°F
300°C 14.4 W/m-ºC
800°F
114 Btu-in./ft.2-hr.-°F
400°C 16.5 W/m-ºC
1000°F
130 Btu-in./ft.2-hr.-°F
500°C 18.0 W/m-ºC
1200°F
151 Btu-in./ft.2-hr.-°F
600°C 20.3 W/m-ºC
1400°F
176 Btu-in./ft.2-hr.-°F
700°C 23.6 W/m-ºC
Mean Coefficient of Thermal Expansion 70-400°F 6.9 µin/in.-°F 20-200°C 12.3 µm/m-°C
70-600°F 7.3 µin/in.-°F 20-400°C 13.0 µm/m-°C
70-800°F 7.4 µin/in.-°F 20-600°C 13.4 µm/m-°C
70-1000°F 7.5 µin/in.-°F 20-700°C 13.8 µm/m-°C
70-1200°F 7.9 µin/in.-°F 20-800°C 14.5 µm/m-°C
70-1400°F 8.2 µin/in.-°F 20-900°C 14.9 µm/m-°C
Electrical Resistivity 70°F 47.5 µohm-in. 20°C 120.5 µohm-cm
1300°F 49.6 µohm-in. 705°C 126.0 µohm-cm
1500°F 48.8 µohm-in. 815°C 124.1 µohm-cm
Dynamic Modulus of Elasticity 70°F
31.7 x 106psi
20°C 219 GPa
400°F
29.4 x 106psi
200°C 204 GPa
800°F
27.7 x 106psi
400°C 192 GPa
1000°F
26.7 x 106psi
600°C 181 GPa
1200°F
25.8 x 106psi
700°C 171 GPa
1400°F
24.1 x 106psi
800°C 163 GPa
1600°F
22.4 x 106psi
900°C 151 GPa
1800°F
20.1 x 106psi
1000°C 136 GPa

RT= Room Temperature

Impact Strength

Form Condition Test Temperature Charpy V-Notch Impact Strength
Bar, forged, 1/2-inch diameter Heat-treated for 30 minutes at 2150°F (1177°C), RAC °F °C Range ft.-lb. Mean Value, ft.-lb.
RT RT 80-88 85.0
500 260 94-102 97.4
800 427 94-96 94.8
1100 593 80-90 83.4
1400 760 73-76 74.8
1700 927 63-72 68.6

RT= Room Temperature

Tensile Data

Short-Time Tensile Data

Form Condition Aging Test Temperature 0.2% Offset Yield Strength Ultimate Tensile Strength Elongation
Sheet 0.063 in. thick Heat-treated for at 2150°F (1177°C), RAC °F °C Time, h °F °C ksi MPa ksi MPa %
- - - RT RT 45.5 314 115.1 794 50.7
- - - 1100 593 32.9 227 86.9 599 45.3
- - - 1300 706 31.6 218 69.6 480 30.0
- - - 1500 816 29.5 203 55.9 385 24.3
- - - 1700 927 25.9 179 34.0 234 30.0
Aged 1500 816 128 RT RT 49.3 340 115.4 796 46.8
Heat-treated at 2150°F (1177°C), then welded andtested as-welded - - - RT RT - - 116.1 800 37.5
- - - 1200 649 - - 71.5 493 17.0
- - - 1300 704 - - 63.5 438 10.5
- - - 1500 816 - - 52.0 359 8.5
Sheet 0.045 in. thick Heat-treated at 2150°F (1177°C), then welded andtested as-welded, RAC - - - RT RT 44.7 308 114.4 789 50.0
- - - 1000 538 28.3 195 93.0 641 46.0
- - - 1100 593 28.9 199 93.0 641 50.0
- - - 1200 648 27.5 190 82.4 568 37.0
- - - 1300 704 28.0 193 69.9 482 24.0
- - - 1400 760 26.2 181 61.8 426 21.0
Aged 1000 538 10,000 RT RT 45.1 311 117.7 812 50.0
1100 593 10,000 RT RT 47.5 328 120.0 827 49.0
1200 648 10,000 RT RT 46.8 323 116.0 800 46.0
1300 704 10,000 RT RT 45.8 316 115.5 796 46.0
1400 760 10,000 RT RT 43.6 301 115.0 793 40.0
1000 538 10,000 1000 538 - - 97.7 674 46.0
1100 593 10,000 1100 593 - - 90.5 624 40.0
1200 648 10,000 1200 649 - - 81.9 565 32.0
1300 704 10,000 1300 704 - - 76.1 525 24.0
1400 760 10,000 1400 760 - - 65.1 449 20.0
Weld Metal As Welded - - RT RT - - 116.1 800 39.3*
- - 1200 649 - - 73.6 507 18.1*
Aged 1200 648 500 RT RT - - 116.8 805 38.6*
1200 648 500 1200 649 - - 82.7 570 26.5*

*Elongation in one inch
RT= Room Temperature

Formability

Form Condition Erichsen Cup Depth, mm.
Sheet, 0.063 inch thick Heat-treated for 8 minutes at 2150°F (1177°C), RAC 13.4

Specifications and Codes

Specifications

HASTELLOY® N alloy (N10003)
Sheet, Plate & Strip AMS 5607SB 434/B 434P= 44
Billet, Rod & Bar AMS 5771SB 573/B 573P= 44
Coated Electrodes -
Bare Welding Rods & Wire SFA 5.14/ A 5.14 (ERNiMo-2)F= 44
Seamless Pipe & Tube -
Welded Pipe & Tube -
Fittings SB 366/B 366P= 44
Forgings AMS 5771
DIN -
TÜV -
Others Mil-N24390B

Codes

HASTELLOY® N alloy (N10003)
ASME Section l -
Section lll Class 1 -
Class 2 -
Class 3 -
Section Vlll Div. 1
1300°F (704°C)1
Div. 2
800°F (427°C)1
Section Xll
650°F (343°C)1
B16.5
1300°F (704°C)2
B16.34
1300°F (704°C)2
B31.1 -
B31.3 -
VdTÜV (doc #) -

1Plate, Sheet, Bar
2Plate, Bar

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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