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K-Monel/K500

K-Monel/K500

Nickel (Ni) - 63.0 Min
Copper (Cu) - 30.0 Median
(27.0 Min - 33.0 Max)
Aluminum Al - 2.725 Median
(2.3 Min - 3.15 Max)
Iron (Fe) - 2 Max
Manganese (Mn) - 1.5 Max
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 63.0 Min
  • Copper (Cu) 30.0 Median
    (27.0 Min - 33.0 Max)
  • Aluminum Al 2.725 Median
    (2.3 Min - 3.15 Max)
  • Iron (Fe) 2 Max
  • Manganese (Mn) 1.5 Max
  • Carbon (C) 0.25 Max
  • Silicon (Si) 0.5 Max
  • Sulfur (S) 0.01 Max
  • Titanium (Ti) 0.60

UNS N05500

K-Monel is a variant of Monel 400. The addition of aluminum and titanium, along with a heat-treat process known as age-hardening, creates a much stronger material. Corrosion resistance is similar. It is approved by ASME for bolting applications up to 500° F. K500 is used extensively in critical marine applications.

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Summary

  • Environment:
    Mildly Corrosive: Salt Water & Mild Acids
  • Temperature Limit:
    1100 °F / 593 °C
  • Ultimate Tensile (Typical):
    160 ksi / 1103 mpa

Specifications & Technical Data

If your question isn’t answered below, download the technical data sheet here.

Physical and Thermal Properties

Physical Constants of MONEL Alloy K-500
Density g/cm3 8.44
lb/in3 0.305
Melting Range °F 2400-2460
°C 1315-1350
Modulus of Elasticity, 103 ksi Tension 26.0
Torsion 9.5
Poisson’s Ratio (aged material at room temperature) 0.32

 

Thermal Properties of MONEL Alloy K-500
Temperature a Mean Linear Expansion b Thermal Conductivity b Specific Heat c Electrical Resistivity
°F °C in/in/°F x 10-6 µm/m•°C Btu-in/h/ft2/°F W/m•°C Btu/lb/°F J/kg•°C ohm-circ mil/ft µΩ•m
-320 -200 6.2 11.2 – – – – 330.8d 0.550
-250 -157 6.5 11.7 86 12.3 0.071 297.3 – –
-200 -130 6.8 12.2 92 13.1 0.077 322.4 – –
-100 -70 7.2 13.0 103 14.7 0.087 364.3 – –
70 21 – – 121 17.2 0.100 418.7 370 0.615
200 100 7.6 13.7 136 19.4 0.107 448.0 372 0.618
400 200 8.1 14.6 156 22.2 0.114 477.3 378 0.628
600 300 8.3 14.9 178 25.4 0.117 489.9 385 0.640
800 400 8.5 15.3 198 28.2 0.120 502.4 390 0.648
1000 500 8.7 15.7 220 31.4 0.125 523.4 393 0.653
1200 600 9.1 16.4 240 34.2 0.132 552.7 396 0.658
1400 700 9.3 16.7 262 37.3 0.141 590.3 400 0.665
1600 800 9.6 17.3 282 40.2 0.157 657.3 408 0.678
1800 900 – – e302 43.1 e0.186 778.7 418 0.695

aBetween 70°F (21°C) and temperature shown. Age-hardened material.
bMaterial was in the annealed condition prior to test.
cElectrical resistivity is markedly influenced by thermal history because of the age-hardening characteristics of the alloy. The data shown represent values measured on decreasing temperature on material in an equivalent to annealed condition with a small amount of age hardening.
dResistivity of sample from this test tested at room temperature: 355.5 ohm/circ mil/ft.
eExtrapolated.

Dimensional Stability of MONEL alloy K-500
Condition Length Change, microinch/inch Cycleda
Aged at 70°F Aged at 160°F
1 Month 3 Months 12 Months 1 Month 3 Months
Cold-Drawn 0 -5 -5 – – –
Cold-Drawn, Agedb -5 -5 – 0 -5 0

aCycled 10 times between 70°F and -95°F.
b1000°F/9 hr, F.C. to 900°F, A.C.

Mechanical Properties

Nominal Mechanical Property Ranges of MONEL Alloy K-500
Form and Condition Tensile Strength Yield Strength (0.2% Offset) Elongation, % Hardness
Brinell (3000-kg) Rockwell
ksi MPa ksi MPa
Rod and Bar
Hot-Finished 90-155 621-1069 40-110 276-758 45-20 140-315 75B-35C
Hot-Finished, Agedb 140-190 965-1310 100-150 690-1034 30-20 265-346 27-38C
Hot-Finished, Annealed 90-110 621-758 40-60 276-414 45-25 140-185 75-90B
Hot-Finished, Annealed and Agedb 130-165 896-1138 85-120 586-827 35-20 250-315 24-35C
Cold-Drawn, As-Drawn 100-140 690-965 70-125 483-862 35-13 175-260 88B-26C
Cold-Drawn, Agedb 135-185 931-1276 95-160 655-1103 30-15 255-370 25-41C
Cold-Drawn, Annealed 90-110 621-758 40-60 276-414 50-25 140-185 75-90B
Cold-Drawn, Annealed and Agedb 130-190 896-1310 85-120 586-827 30-20 250-315 24-35C
Sheet, Cold-Rolled, Annealed 90-105 621-724 40-65 276-448 45-25 – 85B max.
Strip, Cold-Rolled
Annealed 90-105 621-724 40-65 276-448 45-25 – 85B max.
Annealed and Agedb 130-170 896-1172 90-120 621-827 25-15 – 24C min.
Spring Temper 145-165 1000-1138 130-160 896-1103 8-3 – 25C min.
Spring Temper, Agedb 170-220 1172-1517 130-195 896-1345 10-5 – 34C min.
Tube and Pipe, Seamless
Cold-Drawn, Annealed 90-110 621-758 40-65 276-448 45-25 – 90B max.
Cold-Drawn, Annealed and Agedb 130-180 896-1241 85-120 586-827 30-15 – 24-36C
Cold-Drawn, As-Drawn 110-160 758-1103 85-140 586-965 15-2 – 95B-32C
Cold-Drawn, As-Drawn, Agedb 140-220 965-1517 100-200 690-1379 25-3 – 27-40C
Plate
Hot-Finished 90-135 621-931 40-110 276-758 45-20 140-260 75B-26C
Hot-Finished, Agedb 140-180 965-1241 100-135 690-981 30-20 265-337 27-37C
Wire, Cold Drawnc
Annealed 80-110 552-758 35-65 241-448 40-20 – –
Annealed and Agedb 120-150 827-1034 90-110 621-758 30-15 – –
Spring Temper 145-190 1000-1310 130-180 896-1241 5-2 – –
Spring Temper, Agedb 160-200 1103-1379 140-190 965-1310 8-3 – –

aThe ranges shown are composites for various product sizes and therefore are not suitable for specification purposes.
bNominal properties for material age-hardened to produce maximum properties.
cProperties shown are for sizes 0.0625 – 0.250-in. diameter. Properties for other sizes may vary from these.

Room-Temperature Smooth and Notch Tensile Properties of MONEL alloy K-500
Sample Temper Yield  Strength (0.2% Offset), ksi Notched Tensile Strength, ksi Tensile Strength, ksi NT/TSa Elongation, % Reduction of Area, % Hardness, Rc
Rod (2 5/8-in. Dia.) Cold-drawn, Annealed & Aged 97.5 185.5 152.5 1.22 25 43.0 28
Rod (3 5/8-in. Dia.) Hot-Rolled & Aged 119.0 212.0 165.0 1.28 22 45.2 32
Rod (3-in. Dia.) Cold-Drawn & Aged 122.0 215.0 161.0 1.34 22 43.2 29
Threaded cap screw Cold-Drawn & Aged 125.5 205.0 169.0 1.21 18 28.5 31
Threaded Stud Cold-Drawn & Aged 128.0
129.5		 232.0
237.5		 165.0
165.5		 1.41
1.43		 20
20		 42.0
41.5		 33
32

aRatio of notch tensile strength to smooth tensile strength.

Hot Hardness of MONEL alloy K-500 Rod
Condition Hardness, Brinell
70°F (21°C) 700°F (371°C) 800°F (427°C) 900°F (482°C) 1000°F (538°C) 1100°F (593°C)
Hot-Finished 241 223 207 201 170 179
Hot-Finished, Aged 331 311 302 293 255 229

 

Tensile Properties of MONEL Alloy K-500 Sheet and Butt Weldsa
Test Temperature, °F Sheet Weld
Tensile Strength, ksi Yield Strength, ksi Elongation, % NT/TSb Tensile Strength, ksi Joint Efficiency, % Elongation, %
78 154 97.3 22 0.93 141 92 11
-100 166 107 24 0.93 154 93 14
-320 183 120 30 0.95 170 93 15
-423 200 136 28 0.99 190 95 14

a0.020-in. sheet age-hardened 1080°F/16 hr. Heliarc welds heat-treated after welding. Longitudinal tests.

bRatio of notch tensile strength to smooth tensile strength, Kt=6.3.

Torsional Properties

Torsional Properties of MONEL Alloy K-500 Bar
Condition Yield Strength (0.00% Offset), ksia Johnson’s Apparent Elastic Limit, ksi Angle of Twist, deg/in
Hot-Rolled 27 29 620
Hot-Rolled, Aged 57 67 104
Cold-Drawn 48 55 360
Cold-Drawn, Aged 62 71 76

aSs= 5.08 Mt / d3, where Ss = torsional stress on the outer fiber (psi), Mt= Torsional moment (in.-lb), and d = specimen diameter (in.)

Comparison of Tensile and Torsional Properties of MONELAlloy K-500 Rod and Wire
Form Condition Tensile Torsional Ratios
Torsional Breaking Strength/ Tensile Strength Torsional Proportional Limit/ Tensile Strength Torsional Proportional Limit/Torsional Breaking Strength
Tensile Strength, ksi Yield Strength (0.2% Offset), ksi Breaking Strength, ksi Proportional Limit, ksi
Wire (0.148-in. Dia.) Cold-Drawn 50% 163 – 107 68 0.657 0.417 0.635
Cold-Drawn 50%, Age-Hardened 197 – 137 75 0.696 0.380 0.547
Rod (1-in. Dia.) Hot-Rolled 98 45 69 18 0.704 0.184 0.261
Hot-Rolled, Age- Hardened – – – 62 – – –
Cold-Drawn 20% 134 103 80 45 0.597 0.336 0.562
Cold-Drawn 20%, Age-Hardened 155 125 102 50 0.658 0.373 0.490

Shear Properties

Shear Strength of MONEL Alloy K-500
Condition Maximum Strength, ksi Deflection at Maximum Strength, ksi Tensile Strength, ksi Elongation % Hardness, Rockwell C
Annealed 65.3 0.08 97.5 49.0 84B
Annealed, aged 96.5 0.06 147.2 29.0 29
Half-hard 71.0 0.04 122.0 12.5 25
Half-hard, aged 98.8 0.05 155.6 24.0 31
Full-hard 89.5 0.04 151.5 16.5 33
Full-hard, aged 98.5 0.04 168.5 12.5 37

 

Properties of MONEL Alloy K-500 Rivet Wire and Rivets
Property Condition
As Received Aged 2 Hoursa Aged 4 Hoursb Aged 8 Hoursc Aged 16 Hoursd
Rivet Wire
Average Shear Stress, ksi 69.3 83.2 85.3 85.0 89.2
Ultimate Tensile Stress, ksi 107.3 133.0 137.6 – 147.0
Ratio 0.64 0.63 0.62 – 0.61
Hardness, Rc 13 24 26 26 32
Rivetse
Hardness, Rc – Head 34 40 40 40 40
Hardness, Rc – Shank 23 30 32 30 34

a1080°F/2 hr, A.C.
b1080°F/4 hr, A.C.
c1080°F/8 hr, A.C. 
d1080°F/16 hr, furnace cool to 900°F at the rate of 15°F/hr, A.C.
e1/8-in. diameter x 1/4-in. long.

Bearing Strength of MONEL Alloy K-500
Condition Tensile Properties Bearing Strength Ratio, Bearing Strength/
Tensile Strength, ksi Yield Strength (0.2% offset), ksi Elongation. % Ultimate Strength,a ksi Yield Strength,b ksi Ultimate Strength Yield Strength
Annealed 92.2 38.5 49.0 178.0 68.8 1.93 1.79
Annealed, Aged 145.5 98.5 31.0 295.0 162.0 2.03 1.65
Hard 145.9 139.0 5.0 294.0 190.0 1.72 1.37
Hard, Aged 195.5 177.0 10.0 358.0 262.0 1.83 1.48

aTearing out.

b2% enlargement of hole dia. in sheet.

Compressive & Impact Strength

Compressive Strength of MONEL Alloy K-500 Rod
Property Hot-Rolled Cold-Drawn
As-Rolled Aged As-Drawn Aged
Hardness
Brinell (3000 kg) 165 300 205 330
Rockwell C 5 33 23 35
Vickers (30 kg Diamond pyramid) 167 316 210 336
Tension
Tensile Strength, ksi 100.0 151.0 106.0 158.0
Yield Strength (0.2% offset), ksi 47.0 111.0 85.0 120.0
Elongation, % 42.5 30.0 26.5 22.0
Compression
Yield Strength (0.2% offset), ksi 40.0 121.0 76.0 121.0
Yield Strength (0.1% offset), ksi 34.0 96.0 55.0 102.0

 

Impact Strength of MONEL alloy K-500
Condition Test Orientation Charpy Keyhole Impact Strength, ft-lb
Hot-Finished Longitudinal 74
Transverse 51
Hot-Finished, Annealeda Longitudinal 75
Transverse 48
Hot-Finished, Agedb Longitudinal 39*
Transverse 23*
Hot-Finished, Agedc Longitudinal 25*
Transverse 20*
Hot-Finished, Annealed & Agedd Longitudinal 38*
Transverse 22*
Cold-Drawn Longitudinal 40
Cold-Drawn, Annealeda Longitudinal 90
Cold-Drawn, Agedb Longitudinal 26*
Cold-Drawn, Agedc Longitudinal 20*
Cold-Drawn, Annealed & Agedd Longitudinal 46*

* Specimen fractured completely.
a1800°F/1 hr, W. Q.
b1100°F/16 hr, A.C.
c1100°F/16 hr, F.C. 15°F/hr to 900°F.
dAnneal (a) + age (c).

Properties of Hot-Rolled MONEL alloy K-500 Rod (Annealed 1800°F/½ hr and aged 1100°F/16 hr, F.C. to 1000°F/6 hr, F.C. to 900°F/6 hr, A.C.)
Diameter, a in. Yield Strength (0.2% offset), ksi Charpy V-Notch Impact Strength, ft-lb
1.250 97.3 54
1.250 92.5 72
0.875 109.3 45
1.00 111.0 38

a Each diameter from different heat.

Properties of Cold-Drawn MONEL alloy K-500 Rod (Annealed 1900°F/½ hr and aged 1100°F/16 hr, F.C. to 1000°F/6 hr, F.C. to 900°F/6 hr, A.C.)
Diameter, a  in. Yield Strength (0.2% offset), ksi Charpy V-Notch
Impact Strength, ft-lb
1.250 92.5 76.25
0.812 103.0 43.75
0.687 110.6 39.5

a Each diameter from different heat. Data are averages of 2 tests.

Impact Properties of MONEL alloy K-500
Condition Average Energy Absorbed, ft-lb
Smooth Specimen Notched Specimena
-200°F -120°F +80°F -200°F -120°F +80°F
Tension Test
Hot-Finished, Aged 158 145 141 37 37 35
Cold-Drawn, Aged 127 108 117 34 28 29
Bending test
Hot-Finished, Aged – – – 42 50 55
Cold-Drawn, Aged – – 185 30 30 32

a In tension test, Kt = 3.00; in bending test, Kt = 4.00.

Charpy V-Notch Impact Strength of MONEL alloy K-500a at Low Temperatures
Temperature, °F Impact Strength, ft-lb
Room 37.0
-110 34.0
-320 31.0

a ¾-in. bar, aged 1100°F/21 hr, 1000°F/8 hr, A.C.

Fatigue Strength

Room-Temperature Fatigue Strength of MONEL alloy K-500
Form and Condition Fatigue Strength (108 cycles) ksi Tensile Strength, ksi Ratio, Fatigue Strength/Tensile Strength
Rod
Annealed 38 88 0.43
Hot-Rolled 43 99 0.43
Hot-Rolled, Aged 51 155 0.33
Cold-Drawn 45 120 0.37
Cold-Drawn, Aged 47 170 0.28
Strip
Annealed 27 88 0.31
Spring-Temper, Aged 37 153 0.24

 

Fatigue Strength of MONEL alloy K-500 at Elevated Temperature
Condition Temperature, °F Fatigue Strength, (108 cycles), ksi
Hot-Finished, Aged 80 46.0
1000 43.0
Cold-Drawn, Aged 80 52.0
1000 48.0

 

Fatigue Strength of MONEL alloy K-500 at Low Temperature
Temperature, °F Stress, ksi, for a Fatigue Life of
105 cycles 106 cycles 107 cycles
70 90 55 37
-110 99 67 –
-320 105 69 –
-423 143 101 –

 

Effect of Surface Finish on Fatigue Strength of MONEL alloy K-500 a
Condition Surface Finish Tensile Strength, ksi Fatigue Strength (108 cycles), ksi Ratio, Fatigue Strength/Tensile Strength
Hot-Rolled, Aged Polished 171.0 50.0 0.29
Oxidized 172.5 39.5 0.23
Cold-Drawn, Aged Polished 174.5 57.0 0.33
Oxidized 167.5 39.5 0.24

aR.R. Moore rotating-beam specimens.

Fatigue strength of commercially produced MONEL alloy K-500 wire

MONEL alloy K-500 wire (0.0375-in. diameter, cold-drawn 75% after final anneal). Tested in processed condition. Data determined with a rotating-wire (5000 rpm) arc-fatigue machine.

Creep and Rupture Properties

Creep properties of MONEL alloy K-500 (cold-drawn, aged)

Rupture life of hot-finished aged MONEL alloy K-500.

Rupture life of hot-finished aged MONEL alloy K-500.

 

Working Instructions

Effect of water quenching from various annealing temperatures on hardness of MONEL alloy K-500.

Effect of water quenching from various annealing temperatures on hardness of MONELalloy K-500.

 

Properties of MONEL alloy K-500 Cold Drawn Rod (Annealed 1900°F/1/2 hr, W.Q. and Aged 1100°F/16 hr, F.C. 15°F/hr to 900°F, A.C.)
Diameter, a Tensile Yield Strength Elongation, Reduction Hardness, Yield Strength
in. Strength, ksi (0.2% offset), ksi % of Area, % Rc (0.2% offset),b ksi
3 1/4 156.5 98.0 26 42 29 94.5
3 154.0 95.0 24 39 29 94.0
3 152.0 96.5 26 46 28 95.5
2 3/4 149.0 91.5 26 45 27 90.0
2 5/8 156.0 99.0 25 45 29-30 98.0
1 1/2 160.5 102.0 26 42 29 98.5
1 1/2 152.0 100.5 26 49 29 98.5
1 3/8 153.0 100.5 26 47 28 97.5
1 1/4 150.0 96.5 26 51 27 96.0
1 1/4 153.0 100.0 26 49 28 100.0
1 155.5 99.5 26 45 29 99.0
1 156.5 101.5 25 45 29 101.5
5/8 156.0 100.5 27 46 28 97.5
5/8 155.0 99.5 27 47 26 97.0

 

Effect of Short-Time Aging on Properties of MONEL alloy K-500a
Condition Thermal Treatment Tensile Properties
Temperature,°F Time, hr Tensile Strength, ksi Yield Strength (0.2% offset), ksi Elongation, % Hardness, Rockwell C
Rod, Hot-Rolled — 0 93 45 44 82B
1100 2 132 82 36 17
4 136 86 34 20
8 142 90 33 22
Strip, Annealed — 0 100 50 39 85B
1100 2 142 90 31 24
4 141 96 27 25
8 140 98 27 26
Strip, Cold-Rolled 10% — 0 111 90 27 19
1100 2 155 122 23 31
4 155 122 21 31
8 156 123 21 31
1000 2 141 124 24 31
4 144 123 23 31
8 149 129 22 32
Strip, Cold-Rolled 20% — 0 125 115 14 23
1100 2 163 140 18 34
4 163 142 18 33
8 163 141 18 33
1000 2 169 143 17 34
4 170 143 18 34
8 174 148 18 35
Strip, Cold-Rolled 40% — 0 143 136 5 27
1100 2 175 159 14 37
4 176 159 14 36
8 174 156 14 36
1000 2 182 165 11 37
4 183 164 14 37
8 184 167 13 38
Strip, ColdRolled 50% – 0 148 141 4 29
1100 2 179 166 12 38
4 181 165 12 38
8 177 161 13 38
1000 2 187 173 10 39
4 189 174 13 39
8 189 174 11 39

aThese data are offered as a guide to short-time aging treatments and are not suitable for specification purposes.

Long-Time Aging of Hot-Rolled MONEL alloy K-500 Rod
Thermal Treatment Tensile Strength, ksi Yield Strength (0.2% Offset), ksi Elongation, % Izod Impact, ft-lb Hardness, Brinell, (3000-kg)
Hot-Rolled 97.5 40.5 44.0 83 169
1080°F/16 hr 147.0 92.0 28.0 48 270
1080°F/16 hr + 800°F/1 month 161.5 109.0 26.0 26 310
1080°F/16 hr + 800°F/2 months 165.0 112.0 25.0 23 307
1080°F/16 hr + 800°F/4 months 162.3 109.2 25.5 24 310
1080°F/16 hr + 800°F/8 months 164.3 113.2 23.1 27 308
1080°F/16 hr + 800°F/16 months 163.5 112.0 24.5 25 305

 

Fabricating

Effect of cold work on hardness.

Comparison chart showing effect of cold work on hardness of Monel K-500 to other materials

Effect of cold work and age hardening on properties of MONEL alloy K-500.

Effect of cold work and age hardening on properties of MONELalloy K-500.

 

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