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Inconel 625

Inconel 625

Nickel (Ni) - 57.92 Balance
Chromium (Cr) - 21.5 Median
(20.0 Min - 23.0 Max)
Molybdenum (Mo) - 9.0 Median
(8.0 Min - 10.0 Max)
Iron (Fe) - 5.0 Max
Cobalt (Co) - 1.0 Max
Niobium + Tantalum (Nb+Ta) - 3.65 Median
(3.15 Min - 4.15 Max)
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 57.92 Balance
  • Chromium (Cr) 21.5 Median
    (20.0 Min - 23.0 Max)
  • Aluminum Al 0.4 Max
  • Molybdenum (Mo) 9.0 Median
    (8.0 Min - 10.0 Max)
  • Iron (Fe) 5.0 Max
  • Manganese (Mn) 0.5 Max
  • Cobalt (Co) 1.0 Max
  • Carbon (C) 0.1 Max
  • Silicon (Si) 0.5 Max
  • Titanium (Ti) 0.4
  • Sulfur (S) 0.015 Max
  • Phosphorus (P) 0.015 Max
  • Niobium + Tantalum (Nb+Ta) 3.65 Median
    (3.15 Min - 4.15 Max)

UNS N06625

Inconel 625 combines heat resistance, corrosion resistance and strength. Inconel 625 fasteners are used in environments from cryogenic to 1800º F (1000º C). Resistance to oxidation is a primary characteristic. Like Alloy C276, Inconel 625 is a nickel-chrome-molybdenum alloy. The addition of niobium creates a stronger material. Common applications are in marine environments and pollution control equipment.

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Summary

  • Environment:
    Moderately Corrosive: Acids & Chemicals
  • Temperature Limit:
    1800 °F / 982 °C
  • Ultimate Tensile (Typical):
    144 ksi / 993 mpa

Specifications & Technical Data

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

Specifications

  • Plate, Sheet & Strip: ASTM B443, ASME SB443
  • Rod & Bar: ASTM B446, ASME SB446
  • Seamless Pipe & Tube: ASTM B444, ASME SB444
  • Welded Pipe & Tube: ASTM B704, ASME SB704
  • Fittings: ASTM B366, ASME SB366
  • Forgings: ASTM B564, ASME SB564
  • Others: NACE MR0175

Physical and Thermal Properties

Physical Constants
Density lb/in3 0.305
g/cm3 8.44
Melting Range °F 2350-2460
°C 1290-1350
Specific Heata, Btu/lb°F (J/kg°C) 0°F (-18°C) 0.096 (402)
70°F (21°) 0.098 (410)
200°F (93°C) 0.102 (427)
400°F (204°C) 0.109 (456)
600°F (316°C) 0.115 (481)
800°F (427°C) 0.122 (511)
1000°F (538°C) 0.128 (536)
1200°F (649°C) 0.135 (565)
1400°F (760°C) 0.141 (590)
1600°F (871°C) 0.148 (620)
1800°F (982°C) 0.154 (645)
2000°F (1093°C) 0.160 (670)
Permeability at 200 Oersted 15.9 kA/m 1.0006
Curie Temperature °F < -320
°C -196

 

Thermal and Electrical Properties
Temp. °F Mean Linear Expansiona 10-6 in/in•°F Thermal Conductivityb,c Btu•in/ft2-h•°F Electrical Resistivityc ohm-circ mil/ft        Temp °C Mean Linear Expansiona µm/ µm•°C Thermal Conductivity b,c W/m•°C Electrical Resistivityc µΩ-cm
-250 – 50 –       -157 – 7.2 –
-200 – 52 –       -129 – 7.5 –
-100 – 58 –        -73 – 8.4 –
0 – 64 –        -18 – 9.2 –
70 – 68 776         21 – 9.8 129
100 – 70 780         38 – 10.1 130
200 7.1 75 794         93 12.8 10.8 132
400 7.3 87 806        204 13.1 12.5 134
600 7.4 98 812        316 13.3 14.1 135
800 7.6 109 818        427 13.7 15.7 136
1000 7.8 121 830        538 14.0 17.5 138
1200 8.2 132 830        649 14.8 19.0 138
1400 8.5 144 824        760 15.3 20.8 137
1600 8.8 158 818        871 15.8 22.8 136
1700 9.0 – –        927 16.2 – –
1800 – 175 812        982 – 25.2 135
2000 – – 806       1093 – – 134

aFrom 70°F to temperature shown     bMeasurements made at Battelle Memorial Institute     cMaterial annealed 2100°F/1 hr

Modulus at Elevated Temperaturesa
Temp. °F Modulus of Elasticity, 103 ksi Poisson’s Ratio Temp. °C Modulus of Elasticity, GPa
Tension Shear Tension Shear
Annealed Solution- Treated Annealed Solution- Treated Annealed Solution- Treated Annealed Solution- Treated Annealed Solution- Treated
70 30.1 29.7 11.8 11.3 0.278 0.312 21 207.5 204.8 81.4 78.0
200 29.6 29.1 11.6 11.1 0.280 0.311 93 204.1 200.6 80.0 76.5
400 28.7 28.1 11.1 10.8 0.286 0.303 204 197.9 193.7 76.5 74.5
600 27.8 27.2 10.8 10.4 0.290 0.300 316 191.7 187.5 74.5 71.7
800 26.9 26.2 10.4 10.0 0.295 0.302 427 185.5 180.6 71.7 68.9
1000 25.9 25.1 9.9 9.6 0.305 0.312 538 178.6 173.1 68.3 66.2
1200 24.7 24.0 9.4 9.2 0.321 0.314 649 170.3 165.5 64.8 63.4
1400 23.3 22.8 8.7 8.8 0.340 0.305 760 160.6 157.2 60.0 60.7
1600 21.4 21.5 8.0 8.3 0.336 0.289 871 147.5 148.2 55.2 57.2

aDetermined dynamically on samples from ¾ -in. hot-rolled rod.

Mechanical Properties

True stress-true strain of round.

Inconel 625 True stress-true strain of round.

Nominal Room-Temperature Mechanical Propertiesa
Form And Condition Tensile Strength Yield Strength (0.2% Offset) Elongation Reduction Of Area Hardness, Brinell
ksi MPa ksi MPa % %
ROD, BAR, PLATE
As-Rolled 120-160 827-1103 60-110 414-758 60-30 60-40 175-240
Annealed 120-150 827-1034 60-95 414-655 60-30 60-40 145-220
Solution-Treated 105-130 724-896 42-60 290-414 65-40 90-60 116-194
SHEET and STRIP
Annealed 120-150 827-1034 60-90 414-621 55-30 – 145-240
TUBE and PIPE, COLD-DRAWN
Annealed 120-140 827-965 60-75 414-517 55-30 – –
Solution-Treated 100-120 689-827 40-60 276-414 60-40 – –

aValues shown are composites for various product sizes up to 4 in. They are not suitable for specification purposes. For properties of larger-sized products, consult Special Metals Corporation.

Tensile Properties and Hardness

High-temperature tensile properties of annealed bar

High-temperature tensile properties of annealed bar

Effect of Intermediate-Temperature Exposure (2000 hrs) on Properties of Hot-Rolled Annealed Bar
Exposure Temp., °F (°C) Properties at Room Temp. Properties at Exposure Temp.
Tensile Strength Yield Strength (0.2% offset) Elongation, % Tensile Strength Yield Strength (0.2% offset) Elongation, %
ksi MPa ksi MPa ksi MPa ksi MPa
No Exposure 140.0 965.3 69.5 479.2 54 – – – – –
1200 (649) 176.0 1213.5 126.5 872.2 30 146.5 1010.1 106.5 734.3 54
1400 (760) 163.0 1123.8 107.0 737.7 26 84.8 584.7 79.0 544.7 62
1600 (871) 144.0 992.8 76.7 528.8 34 41.2 284.1 40.0 275.8 80

aValues shown are composites for various product sizes up to 4 in. They are not suitable for specification purposes. For properties of larger-sized products, consult Special Metals Corporation.

High-temperature tensile properties of cold-rolled annealed sheet

Inconel 625 High-temperature tensile properties of cold-rolled annealed sheet.

High-temperature tensile properties of hot-rolled solution-treated rod

Inconel 625 High-temperature tensile properties of hot-rolled solution-treated rod.

Approximate relationships between hardness and tensile properties of strip

Inconel 625 Approximate relationships between hardness and tensile properties of strip.

Fatigue Strength

Fatigue strength at room temperature of hot-rolled round (5/8-in. diameter)

Inconel 625 Fatigue strength at room temperature of hot-rolled round (5/8-in. diameter)

Rotating-beam fatigue strength of hot-rolled solution-treated bar (0.625-in. diameter) at elevated temperature. Average grain size, 0.004 in.

Inconel 625 Rotating-beam fatigue strength of hot-rolled solutiontreated bar (0.625-in. diameter) at elevated temperature. Average grain size, 0.004 in.

Rotating-beam fatigue strength of hot-rolled annealed bar (0.625-in. diameter) at elevated temperature. Average grain size, 0.0006 in.; room-temperature hardness, 24.5 Rc

Rotating-beam fatigue strength of hot-rolled annealed bar (0.625-in. diameter) at elevated temperature. Average grain size, 0.0006 in.; room-temperature hardness, 24.5 Rc.

 

Creep and Rupture Strength

Creep strength of solution-treated material

Creep strength of solution-treated material.

Rupture life of solution-treated material

Rupture life of solution-treated material.

Creep strength of annealed material

Creep strength of annealed material.

Rupture life of annealed material

Rupture life of annealed material.

Corrosion Resistance

Scaling resistance at 1800°F

Inconel 625 Scaling resistance at 1800°F

Working Instructions

Effect of Annealing (1 hour) on Room-Temperature Properties of Hot-Rolled Rod
Annealing Temperature, °F Tensile Strength, ksi Yield Strength (0.2% Offset), ksi Elongation, % Reduction Of Area, % Hardness, Rb
As-Rolled 147.5 92.0 46.0 55.3 98
1400 145.5 90.8 43.0 49.5 101
1500 143.5 85.0 42.0 45.7 101
1600 145.5 87.2 39.0 41.5 101
1700 147.0 86.0 40.0 48.0 103
1800 143.5 83.6 44.0 48.0 101
1850 142.5 78.6 46.0 53.0 99
1900 142.5 66.3 49.0 51.5 95
2000 124.0 52.5 64.0 62.5 93
2100 116.0 50.0 62.0 61.0 89
2200 116.5 48.0 72.0 61.3 88
Annealing Temperature,°C Tensile  Strength, MPa Yield Strength (0.2% Offset), MPa Elongation, % Reduction Of Area, % Hardness, Rb
As-Rolled 1017.0 634.3 46.0 55.3 98
760 1003.2 626.0 43.0 49.5 101
816 989.4 586.1 42.0 45.7 101
871 1003.2 601.2 39.0 41.5 101
927 1013.5 593.0 40.0 48.0 103
982 989.4 576.4 44.0 48.0 101
1010 982.5 542.0 46.0 53.0 99
1038 982.5 457.1 49.0 51.5 95
1093 855.0 362.0 64.0 62.5 93
1149 799.8 344.7 62.0 61.0 89
1204 803.2 331.0 72.0 61.3 88
Effect of annealing temperature on the hardness Of sheet (30 min at temperature)

Inconel 625 Effect of annealing temperature on the hardness Of sheet (30 min at temperature).

Effect of Annealing (1 Hour) on Room-Temperature Properties of Cold-Drawn Rod
Annealing Temperature, Tensile Strength, Yield Strength (0.2% Offset), Elongation % Reduction Of Area, % Hardness, Rb Impact Strength (Charpy V) Grain Size,
°F °C ksi MPa ksi MPa ft•lb J in. mm
As-Drawn As-Drawn 163.0 1123.8 145.5 1003.2 21.0 50.5 106 64.5 87.5 0.003 .076
1100 593 160.5 1106.6 134.3 926.0 28.0 48.3 106 75.0 101.7 0.0035 .089
1200 649 159.5 1099.7 133.5 920.5 28.5 47.2 106 71.5 97.0 0.0045 .114
1300 704 164.0 1130.7 135.0 930.8 26.0 38.8 106 57.0 77.3 0.005 .127
1400 760 162.5 1120.4 135.5 934.2 27.0 39.0 106 53.0 71.9 0.005 .127
1500 816 152.0 1048.0 120.0 827.4 29.0 41.5 105 55.0 74.6 0.0035 .089
1600 871 146.5 1010.1 102.5 706.7 35.0 45.2 103 62.0 84.1 70% 0.005 .127
30% 0.009 .229
1700 927 133.5 920.5 62.3 429.5 48.5 44.0 97 82.5 111.9 0.0008 .203
1800 982 127.5 879.1 62.3 429.5 52.0 55.3 95 84.5 114.6 0.0009 .229
1900 1038 130.5 899.8 60.8 419.2 53.0 55.7 95 91.0 123.4 0.0008 .203
2000 1093 126.5 872.2 56.5 389.6 57.0 61.0 93 115.5 156.6 0.0019 .048
2100 1149 118.0 813.6 48.3 333.0 63.0 60.4 89 138.0 187.1 0.0032 .081
2200 1204 113.0 779.1 44.6 307.5 62.3 58.4 86 141.0 191.2 0.006 .152
Loads required for shearing annealed material (hydraulic shear, 21/64 in./ft knife rake)

Room-Temperature Tensile Properties of As-Drawn Wirea
Wire Diameter, Cold Reduc-tion, % Tensile Strength Yield Strength (0.2% offset)b, Elongation In 10 Inches, %
In. Mm ksi MPa ksi MPa
0.0397c 1.008c 0 138 952 61.5 424 52.3
0.036 0.914 19 174.5 1203 153.3 1057 17.5
0.0318d 0.808d 37 220 1517 205 1413 2.0
0.0285d 0.724d 49 246 1696 218 1503 2.0
0.0253d 0.643d 60 269 1855 253 1744 2.4
0.0226d 0.574d 68 283 1951 242 1669 2.2
0.020d 0.508d 75 293 2020 251 1731 2.0
0.0179 0.455 80 295.3 2036 220 1517 3.8
0.0159 0.404 84 303 2089 250 1727 3.4
0.0142 0.361 87 306 2110 252.8 1743 3.0
0.0126 0.320 90 316 2181 269 1855 2.6
0.0111 0.282 92 316 2179 264 1820 2.3
0.0099 0.251 94 322.3 2222 274.5 1893 3.0

aAverage of 2 tests unless otherwise shown.   bCrosshead speed, 0.1 in./min.   cStrand-annealed at 2150°F, 29 ft/min, in 10-ft furnace with 6-7 ft hot zone.   dOne test.

Effect of Cold Work on Mechanical Properties of Strips Cut From Hot-Rolled Plate (0.372-in.), Solution-Treated 2150°F/1 hr and Cold Worked
Cold Reduction, % Tensile Strength Yield Strength (0.2% offset)b Elongation % Reduction Of Area, % Hardness
ksi MPa ksi MPa Rockwell C Vickers
0 115.5 796.3 49.5 341.3 67.0 60.4 88 Rb 179
5 121.0 834.3 77.5 534.3 58.0 58.1 94 Rb 209
10 130.0 896.3 102.5 706.7 47.5 54.6 25 257
15 137.0 944.6 112.5 775.7 39.0 51.9 32 309
20 143.0 986.0 125.0 861.8 31.5 50.0 34 326
30 165.0 1137.6 152.0 1048.0 17.0 49.3 36 344
40 179.5 1237.6 167.0 1151.4 12.5 41.9 39 372
50 189.5 1306.6 177.0 1220.4 8.5 38.0 40 382
60 205.0 1413.4 180.5 1244.5 6.5 32.7 44 427
70 219.0 1510.0 201.0 1385.8 5.0 25.4 45 440
Effect of cold work on hardness

Effect of cold work on hardness.

 

Machining

Recommended Conditions for Turning with Single-Point Tools
High Speed Steel Coated Carbide
Surface Speed Feed Surface Speed Feed
fpm m/min lpr Mm/rev fpm m/min lpr m/rev
13-35 4.0-10.7 0.005-0.020 0.13-0.51 45-110 14-34 0.005-0.020 0.13-0.51

 

Welding

Limiting Chemical Composition, %, of Welding Products
  INCONEL Filler Metal 625 INCONELa  Welding Electrode 112
Nickelb 58.0 min. 55.0 min.
Carbon 0.10 max. 0.10 max.
Manganese 0.50 max. 1.0 max.
Iron 5.0 max. 7.0 max.
Sulfur 0.015 max. 0.02 max.
Silicon 0.50 max. 0.75 max.
Chromium 20.0-23.0 20.0-23.0
Niobium (plus Tantalum) 3.15-4.15 3.15-4.15
Molybdenum 8.0-10.0 8.0-10.0
Aluminum 0.40 max. –
Titanium 0.40 max. –
Cobaltc – 0.12c
Phosphorus 0.02 max. 0.03
Copper 0.50 max. 0.50 max.
Other 0.50 max. 0.50 max.

aDeposited weld metal.    bPlus cobalt.    cWhen specified.

 

All-Weld-Metal Properties

Low-Temperature Impact Strength of INCONEL Welding Products All-Weld Metal
Welding Material Notch Orientation To Welding Direction Charpy V-Notch Impact Strength, ft-lb (J)
-320°F (-196°C) -110°F (-79°C) Room Temperature
Filler Metal 625a Perpendicular 57.0 (77.3) 60.0 (81.5) 68.5 (92.9)
Electrode 112 Perpendicular 34.8 (47.2) 42.5 (57.6) 46.5 (63.1)
Parallel 32.8 (44.5) 41.5 (56.3) 45.0 (61.0)

aGas-tungsten-arc welding process.

High-temperature tensile properties of transverse specimens of INCONEL alloy 625 welds (1/2-in. solution-treated plate; gas-tungsten-arc process with INCONEL Filler Metal 625)

High-temperature tensile properties of transverse specimens of INCONEL alloy 625 welds (1/2-in. solution-treated plate; gas-tungsten-arc process with INCONEL Filler Metal 625).

High-temperature tensile properties of INCONEL alloy 625 all-weld metal (1/2-in. solution-treated plate; gastungsten-arc process with INCONEL Filler Metal 625)

High-temperature tensile properties of INCONEL alloy 625 all-weld metal (1/2-in. solution-treated plate; gastungsten-arc process with INCONEL Filler Metal 625).

High-temperature tensile properties of deposited weld metal from weld made in alloy 625 with Welding Electrode 112

High-temperature tensile properties of deposited weld metal from weld made in alloy 625 with Welding Electrode 112.

Rupture strength of INCONEL Welding Electrode 112 all-weld metal

Rupture strength of INCONEL Welding Electrode 112 all-weld metal.

100-hr rupture strength of transverse specimens from joints n alloy 625 made by gas-tungsten-arc process using Filler Metal 625

100-hr rupture strength of transverse specimens from joints n alloy 625 made by gas-tungsten-arc process using Filler Metal 625.

Transverse Properties

Strength of Dissimilar Weldsa
INCONEL alloy 625 Joined to Gas-Metal-Arc (Spray Transfer) With Filler Metal 265 Gas-Tungsten-Arc With Filler Metal 625 Shielded-Metal-Arc With Welding Electrode 112
Tensile Strength, Ksi (MPa) Fracture Location Tensile Strength, Ksi (MPa) Fracture Location Tensile Strength, Ksi (MPa) Fracture Location
Hastelloy alloy X 121.2 (835.6) Alloy X 119.7 (825.3) Alloy X 118.5 (817.0) Alloy X
INCONEL alloy 718 120.7 (832.2) Alloy 718 107.5 (741.2) Alloy 718 110.25 (760.1) Alloy 718
Type 304 Stainless Steel 88.5 (610.2) Type 304 92.0 (634.3) Type 304 91.25 (629.1) Type 304
Type 410 Stainless Steel 65.6 (452.3) Type 410 67.6 (466.1) Type 410 61.6 (424.7) Type 410
MO-RE® 1 – – 97.3 (670.9) MO-RE 1 94.7 (653.0) MO-RE 1

aTransverse specimens. Joints were 3/8 in. thick except for those with MO-RE 1, which were ½ in.   bThese joints were preheated to 300°F. Hastelloy is a trademark of Haynes International, and MO-RE is a trademark of Blaw-Knox Corporation

 

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