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 is a high-performance nickel-based alloy known for its exceptional strength, corrosion resistance, and ability to withstand extreme temperatures. Its unique combination of properties makes it ideal for demanding environments, especially in the aerospace, marine, chemical processing, and oil & gas industries. In fastener applications, Inconel 625 offers durability and reliability in corrosive and high pressure settings where standard materials may fail. This alloy is a trusted choice for critical components requiring long-term performance. Ready to enhance your project with Inconel® 625 fasteners?
Contact us today to request a quote or learn more about this material below with content including material specifications, descriptions, sample products and more (Scroll down▼).
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
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
High-temperature tensile properties of hot-rolled solution-treated rod
Approximate relationships between hardness and tensile properties of strip
Fatigue Strength
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.
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
Rupture life of solution-treated material
Creep strength of annealed material
Rupture life of annealed material
Corrosion Resistance
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)
Effect of Annealing (1 Hour) on Room-Temperature Properties of Cold-Drawn Rod
AnnealingTemperature,
TensileStrength,
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
WireDiameter,
Cold Reduc-tion, %
TensileStrength
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, %
TensileStrength
Yield Strength(0.2% offset)b
Elongation %
Reduction Of Area, %
Hardness
ksi
MPa
ksi
MPa
RockwellC
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
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
Low-Temperature Impact Strength of INCONEL Welding Products All-Weld Metal
WeldingMaterial
Notch Orientation To WeldingDirection
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 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
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
Transverse Properties
Strength of Dissimilar Weldsa
INCONEL alloy 625Joined to
Gas-Metal-Arc(Spray Transfer) With Filler Metal 265
Gas-Tungsten-ArcWith Filler Metal 625
Shielded-Metal-Arc With Welding Electrode 112
Tensile Strength, Ksi (MPa)
FractureLocation
Tensile Strength, Ksi (MPa)
FractureLocation
Tensile Strength, Ksi (MPa)
FractureLocation
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
This overview includes a definition of Inconel® 625 including its chemical, physical, and mechanical specifications along with its characteristics. It also contains multiple comparison charts with other similar materials, which we offer.
What is Inconel® 625
Inconel 625 is a nickel-based – chromium – molybdenum – Niobium metal alloy known for its high strength, corrosion & heat resistance. One of its outstanding attributes is its ability to maintain its mechanical properties across a broad temperature range–from cryogenic levels to over 1800℉ (982℃). It also has superior resistance to pitting, crevice corrosion, and stress corrosion cracking.
Chemical Composition
Check out our chemical composition breakdown of Inconel® 625.
Physical Properties
Density: 0.305 lb/in³
Melting Range: 2350℉ – 2460℉
Specific Heat @ 70℉: 0.098 Btu/lb℉
Modulus of Elasticity Dynamic: 29.8 ksi x 10³
Mechanical Properties
Ultimate Tensile Strength: 135 ksi
0.2% Yield Strength: 65 ksi
Elongation: 44%
A Chemical Composition Comparison
Below is a chemical composition comparison between Inconel® 625 and several comparable materials. One of its unique features is its high strength. Inconel® 625 derives its strength from the combination of molybdenum and niobium within its nickel-chromium structure.
Yield Strength vs. Temperature Comparison
Below is a chart graphing Inconel® 625’s yield strength vs temperature and comparing it to other related materials. Most notable is its ability to maintain its high yield strength up to 1500℉. If you are looking for a material for your fastener applications that offers great corrosion resistance and strength, Inconel® 625 is a great option.
Crevice & Pitting Corrosion Resistance
Inconel® 625 has excellent crevice and pitting corrosion resistance. Its PREN Number is 51 and is good option for someone seeking a fastener that resists seawater corrosion. (Get more information about pitting corrosion & PREN values on our blog post.) Check out Inconel® 625’s performance compared to other similar materials concerning critical temperature resistance testing. In this test, each material is exposed to acidified 6 wt.% ferric chloride in accordance with ASTM Standard G 48. The below temperatures indicate the lowest temperature at which crevice or pitting begin to occur. Inconel 625 shows incredible resistance to both crevice and pitting corrosion compared to 316L, 254SMO, and Hastelloy G-30.
Oxidation Resistance Comparison
Oxidation resistance refers to a material’s ability to resist chemical reactions with oxygen, especially at high temperatures. Below are the results of a comparative burner rig oxidation test. Samples are burned on a rotating holder at 1800℉ for 1000 hours. They rotated between the gas stream and a fan cooled process every 30 minutes. Below are the results. Dimensions are in micrometers (μm).
Stress Corrosion Resistance
Another type of corrosion is chloride-induced stress corrosion. Below is a stress corrosion comparison test. In this test, the samples are exposed to 45% magnesium chloride, ASTM G 36. The samples are exposed for 1,008 hours. Inconel® 625 passed the test without any stress corrosion cracking.
Inconel® 625 is an excellent high strength, temperature & corrosion resistant fastener that can meet your project’s specifications & perform in the most extreme conditions providing long-term protection.
Request a quote today or continue scrolling to see our sample products & related products or materials (Scroll down▼).
Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.
