Inconel 625 Tech Data, Inconel 625, Nickel 625 Sheet 625 Plate 625 Pipe 625 Tube 625 Tubing 625 Rod 625 Bar AMS 5599 ASTM-B-443, UNS N06625 UNS N06626 ASTM-B-444 AMS 5666 ASTM-B446 Nickel Sheet Alloys 200, 400, 600, 601, 617, 625, 718, 750, 800, 825, C276

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* Inconel/Incoloy and Monel are Registered Trademarks of Special Metals Corporation and its subsidiaries.

 

Inconel 625 Technical Data

Description: Inconel 625 is a nickel-chromium-molybdenum alloy with an addition of niobium. The addition of molybdenum acts with the niobium to stiffen the alloy matrix, providing a high strength without a strengthening heat treatment. The alloy resists a wide range of corrosive environments and has a good resistance to pitting and crevice corrosion. Inconel 625 is used in chemical processing, aerospace and marine engineering oil & gas, pollution control equipment and nuclear reactors.

Applications: Some typical applications for Inconel 625 have included heat shields, furnace hardware, gas turbine engine ducting, combustion liners and spray bars, chemical plant hardware, and special seawater applications.

      

Specifications:

 

Bar ASTM B 446, ASME SB 466, AMS 5666, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, ASME Code Case 1935
Rod ASTM B 446, ASME SB 466, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, SME Code Case 1935
Wire AMS 5837, ISO 9724, DIN 17753
Forging Stock ASTM B 564, ASME SB 564, AMS 5666, ISO 9725, SME Code Case 1935, DIN 17754
Plate ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499,  BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935
Sheet ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499,  BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935
Strip ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499, EN 10095, DIN 17750,  ASME Code Case 1935
Pipe Seamless ASTM B444, ASTM B829, ASME SB 444, ASME SB 829,  BS3074 NA21
Pipe Welded ASTM B705, ASTM B775, ASME SB 705, ASME SB 775
Tube Seamless ASTM B444, ASTM B829, ASME SB 444, ASME SB 829,  AMS 5581, BS3074 NA21, 
Tube Welded ASTM B704, ASTM B751, ASME SB 704, ASME SB 704,  AMS 5581,   
Tube VdTUV 499, ISO 6207, DIN 17751, ASME Code Case 1935
Fittings ASTM B 366, ASME SB 366
Other UNS N06625, W. Nr 2.4856, ISO NW6625, NACE MR-01-75, INCONEL 625 (trademark)

   

 

Chemical Composition:

 

Ni

Fe

Cr

Si

Mo

Mn

C

Max

 

5.0

23.0

0.50

10.0

0.50

0.10

Min

58.0

 

20.0

 

8.0

 

 

 

 

 

 

 

 

 


      

 

Typical Mechanical Properties:

Material

Ultimate Tensile Strength (psi)

0.2% Offset Yield Strength (psi)

Elongation in 50.8mm (%)

Hardness, Rockwell

Alloy 625 130,000 68,000 42 B65

Nominal Mechanical Properties in the annealed condition

 

Corrosion & Oxidation Resistance:
Inconel 625 has withstood many corrosive environments. In alkaline, salt water, fresh water, neutral salts, and in the air, almost no attack occurs. The nickel and chromium provide resistance to oxidizing environments. Nickel and molybdenum provide for resistance to nonoxidizing atmospheres. Pitting and crevice corrosion are prevented by molybdenum. Niobium stabilizes the alloy against sensitization during welding. Chloride stress-corrosion cracking resistance is excellent. The alloy resists scaling and oxidation at high temperatures.
 

The high level of chromium and molybdenum in Alloy 625 provides a high level of pitting and crevice corrosion resistance to chloride contaminated media, such as seawater, neutral salts, and brines.

Typical Data in Chloride Solutions:

Crevice Test in 10 Percent Ferric Chloride Alloy
316
Alloy
625
Onset Temperature Degrees F (Degrees C)
for Attack in ASTM Procedure G-48
<32
(<0)
104-113
(40-45)

Panel Exposures in Seawater:

Panel Location Onset Temperature Alloy 316 Alloy 625
Flowing Seawater Crevice Attack
1 Month
No Attack
18 Months
Tidal Zone Crevice Attack
1 Month
No Attack
18 Months
Partial Mud Burial Crevice Attack
1 Month
No Attack
18 Months


      

The alloy is resistant to a variety of corrosive media from highly oxidizing to moderately reducing.

Tests in geothermal brines indicate Alloy 625 is highly resistant to hot geothermal fluids comparable to Titanium Grade 2.

Tests in simulated flue gas desulfurization environments show Alloy 625 highly resistant to the environment in comparison to alloys such as Alloy 316 and comparable to Alloy 276.

The following data are illustrative. Typical corrosion rates are in mils/year (mm/a).

Boiling Organic Acid Solutions:

Alloy 45% Formic 10% Oxalic 88% Formic 99% Acetic
Alloy 625 5.0 (0.13) 6.0 (0.15) 9.0 (0.23) 0.4 (0.01)
Alloy 316 11 (0.28) 40 (1.02) 9.0 (0.23) 2.0 (0.05)

Dilute Reducing Acids Boiling Solutions*

Alloy 1% Sulfuric 5% Sulfuric 10% Sulfuric 1% Hydrochloric
Alloy 625 2.2 (0.06) 8.9 (0.23) 25.3 (0.64) 36.3 (0.92)
Alloy 316 25.8 (0.65) 107 (2.72) 344 (8.73) 200 (5)

* Sulfuric acid test samples activated before tests and hydrochloric acid test samples tested without activation.

Miscellaneous Environments:

Environment Alloy 625 Alloy 316
20% Phosphoric Acid .36 (<0.01) 6.96 (0.18)
10% Sulfamic Acid 4.80 (0.12) 63.6 (1.61)
10% Sodium Bisulfate 3.96 (0.10) 41.6 (1.06)


      

Chloride Stress Corrosion Cracking Resistance:

Test Alloy 625 Alloy 316 Alloy 20
42% Magnesium Chloride No Cracks
1000 Hours
Cracks
<24 Hours
Cracks
<100 Hours
26% Sodium Chloride No Cracks
1000 Hours
Cracks
600 Cracks
No Cracks
1000 Cracks

Oxidation Resistance:
Alloy 625 has excellent oxidation and scaling resistance at temperatures up to 2000Degrees F (1093Degrees C). It is superior to many other high temperature alloys under cyclic heating and cooling conditions.

Pickling:
Sodium hydride baths are necessary to descale this alloy. After the sodium hydride treatment, the material should be immersed in a sulfuric acid bath 165 Degrees F (74 Degrees C) for approximately 3 minutes. A 25-minute immersion in a nitric-hydrofluoric bath 145 Degrees F (63 Degrees C) is then necessary. Rinse. Sulfuric solution: 16% by weight, H2SO4. Nitric solution: 8% HNO3 by weight and 3% HF by weight. Acid etching for macro-inspection-expose material electrolytically to a 3-to-1 HCl to HNO3 solution, saturated with CuCl2 at a current density of 0.645 amp/in (25.4 A/m).

Heat Treatment:
Inconel 625 has three basic heat treatments:
(1)High Solution Anneal - 2000/2200 Degrees F (1093/1204 Degrees C), air quench or faster.
(2)Low Solution Anneal - 1700/1900 Degrees F (927/1038 Degrees C), air quench or faster.
(3)Stress Relieve - 1650 Degrees F (899 Degrees C), air quench.

The time at the above temperatures depends on volume and section thickness. Strip, for example, would require shorter times than large sections. Temperatures for treatments No. 1 and 2 are generally held for 1/2 to 1 hour, 1 to 4 hours for treatment No. 3.

Treatment No. 1 is not commonly used for applications below 1500 Degrees F (816 Degrees C). It is generally used above 1500 Degrees F and where resistance to creep is important. The high solution anneal is also used to develop the maximum softness for mild processing operations such as cold rolling or drawing.
 

Treatment No. 2 is the used treatment and develops an optimum combination of tensile and rupture properties from ambient temperatures to 1900 Degrees F (1038 Degrees C). Ductility and toughness at cryogenic temperatures are also very good.
 

Treatment No. 3 is recommended for application below 1200 Degrees F (649 Degrees C) when maximum fatigue, hardness, tensile and yield strength properties are desired. Ductility and toughness at cryogenic temperatures are excellent. When a fine grain size is desired for fatigue, tensile and yield strengths up to 1500 Degrees F (816 Degrees C), treatment No. 3 is sometimes used.

Workability:

Hot Working
Hot working may done at 2100 Degrees F (1149 Degrees C) maximum furnace temperature. Care should be exercised to avoid frictional heat build-up which can result in overheating, exceeding 2100 Degrees F (1149 Degrees C). Alloy 625 becomes very stiff at temperatures below 1850 Degrees F (1010 Degrees C). Work pieces that fall below this temperature should be reheated. Uniform reductions are recommended to avoid the formation of a duplex grain structure. Approximately 15/20% reduction is recommended for finishing.


      

Cold Forming
Inconel 625 can be cold formed by standards methods. When the material becomes too stiff from cold working, ductility can be restored by process anneal.

Machineability
Low cutting speeds, rigid tools and work piece, heavy equipment, ample coolant and positive feeds are general recommendations.

Carbide tools should have smaller angles than high-speed tools and operating speeds can be higher. A sulfur-based cutting fluid is recommended. Thoroughly clean work piece after machining to prevent surface contamination during subsequent heat treating. Chlorine additives would be an alternative.

Weldability
Welding can be accomplished by the gas-shielded processes using a tungsten electrode or a consumable electrode. Postweld heat treatment of the weld are not necessary to maintain corrosion resistance. Heavy restrained sections can be welded and the weld's mechanical properties follow the same trends as base metal properties. Standard practices such as clean surfaces, good joint alignment, U-joints for thicker sections, etc., should be followed.

Physical Properties:

Density:
0.305 Ib/in3
8.44 g/cm3

Specific Gravity:
8.44

Melting Range:
2350 Degrees - 2460 Degrees F
1280 Degrees - 1350 Degrees C

Magnetic Permeability:
75 Degrees F, 200 oersted 1.0006

Specific Heat:
0.098 Btu/lb.- Degrees F
410 Joules/kg- Degrees K

Electrical Resistivity:
0.098 Btu/lb.- Degrees F
410 Joules/kg- Degrees K


      

Temperature Electrical Resistivity
microhm-cm
Degrees F (Degrees C)
70 21 128.9
100 38 129.6
200 93 131.9
400 204 133.9
600 316 134.9
800 427 135.9
1000 538 137.9
1200 649 137.9
1400 760 136.9
1600 871 135.9
1800 982 134.9
2000 1093 133.9

Thermal Properties:

Temperature Linear Coefficient of Thermal
Expansion (a) (Units of 10-6)
Thermal Conductivity (b) (c)
Degrees F Degrees C / Degrees F / Degrees C Btu-ft / ft2 h-Degrees F W/m-Degrees K
-250 -157 4.2 7.3
-200 -129 4.3 7.4
-100 -73 4.8 8.3
0 -18 5.3 9.2
70 21 5.7 9.9
100 38 5.8 10.0
200 93 7.1 12.8 6.3 10.7
400 204 7.3 13.1 7.3 12.6
600 316 7.4 13.3 8.2 14.2
800 427 7.6 13.7 9.1 15.7
1000 538 7.8 14.0 10.1 17.5
1200 649 8.2 14.8 11.0 19.0
1400 760 8.5 15.3 12.0 20.8
1600 871 8.8 15.8 13.2 22.8
1700 927 9.0 16.2
1800 982 14.6 25.3

(a) Average coefficient from 70 Degrees F (21 Degrees C) to temperature shown.
(b) Measurements made at Battelle Memorial Institute.
(c) Material annealed 2100 Degrees F (1149 Degrees C).


      

Modulus Data:

Temperature Modulus of
Rigidity (G)
Elastic Modulus (E) Poisson's Ratio (a)
Degrees F Degrees C Units of 106 psi Units Gpa Units of 106 psi Units Gpa ()
70 21 11.4 79 29.8 205 0.308
200 93 11.2 77 29.2 200 0.310
400 204 10.8 75 28.4 195 0.312
600 316 10.5 72 27.5 190 0.313
800 427 10.1 70 26.6 185 0.312
1000 538 9.7 67 25.6 175 0.321
1200 649 9.2 63 24.4 170 0.328
1400 760 8.7 60 23.1 160 0.329
1600 871 8.2 57 -- -- --

(a) Poisson's ratio (m) computed from the relation: = E-2G/2G

Impact Resistance
Alloy 625 maintains high impact resistance at low temperatures as shown below.

Typical Alloy 625 Impact Properties:

Test Temperature Orientation  Impact Energy (a)
Degrees F Degrees C Ft-lbs Joules
85 30 Longitudinal 49 66
85 30 Transverse 49 66
-110 - 79 Longitudinal 44 60
-110 - 79 Transverse 41.5 56
-320 -196 Longitudinal 35 47
-320 -196 Transverse 35 47

(a) Charpy Keyhole Specimens (Mean Value of 3 Tests)

Impact properties may be expected to decrease with extended service in the 1200 Degrees  to 1600 Degrees F (649 Degrees  to 871 Degrees C) range.

 

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