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INCONEL 625 (UNS N06625 / W.Nr.2.4856) Featured Image
  • INCONEL 625 (UNS N06625 / W.Nr.2.4856) 1

INCONEL 625 (UNS N06625 / W.Nr.2.4856)

Short Description:

Alloy 625 (UNS N06625) 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. Alloy 625 is used in chemical processing, aerospace and marine engineering oil & gas, pollution control equipment and nuclear reactors.


Product Detail

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Product Introduction

Inconel 625 is composed primarily of nickel (58%), chromium (20-23%), molybdenum (8-10%), manganese (5%), and iron (3-5%). It also contains trace amounts of titanium, aluminum, cobalt, sulfur, and phosphorus. This combination of elements makes it resistant to oxidation and corrosion at high temperatures.

Alloy 625 is a nickel-chromium alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures can range from cryogenic to 980°C (1800°F). Alloy 625 strength is derived from the solid solution strengthening effect of molybdenium and niobium on its nickel-chromium matrix.

Thus precipitation-hardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to high-temperature effects such as oxidation and carburization.

Inconel alloy 625 is a highly sought-after alloy due to its impressive mechanical properties. It has excellent fatigue strength, tensile strength, and a high degree of creep rupture under temperatures as high as 1500F. Furthermore, its stress corrosion cracking resistance and oxidation resistance make it suitable for many extreme applications. UNS N06625 also offers superior weldability and formability compared to many other similar materials – making it an ideal choice for parts that need to be deeply formed or complexly joined. All in all, Inconel 625 is an incredibly strong and versatile solution in the competitive world of metal alloys

The behavior and chemical composition of this grade make it well suited for nuclear and aerospace applications.

Application

The behavior and chemical composition of this grade make it well suited for nuclear and aerospace applications.

Product Specifications

ASTM B444

Chemical Requirements

Alloy 625 (UNS N06625)

Composition %

C
Carbon		 Mn
Manganese		 Si
Silicon		 P
Phosphorous		 Cr
Chromium		 Nb+Ta
Niobium-Tantalum		 Co
Cobalt		 Mo
Molybdenum		 Fe
lron		 Al
Aluminum		 Ti
Titanium		 Ni
Nickel
0.10 max 0.50 max 0.50 max 0.015 max 20.0-23.0 3.15-4.15 1.0 max 8.0-10.0 5.0 max 0.40 max 0.40 max 58.0 min
Mechanical Properties 
Yield Strength 60 Ksi min
Tensile Strength 120 Ksi min
Elongation(2" min) 30%

Size Tolerance

O.D O.D Toleracne W.T Tolerance
Inch mm %
1/8" +0.08/-0 +/-10
1/4" +/-0.10 +/-10
Up to 1/2" +/-0.13 +/-15
1/2" to 1-1/2" , excl +/-0.13 +/-10
1-1/2" to 3-1/2" , excl +/-0.25 +/-10
Note: The tolerance can be negotiated according to the customer's specific requirements
Maximum allowable pressure(unit: BAR)
Wall Thickness(mm)
    0.89 1.24 1.65 2.11 2.77 3.96 4.78
O.D(mm) 6.35 774 1125 1540        
9.53 497 713 982 1293      
12.7 366 521 712 937 1271    
19.05   339 459 597 806    
25.4   251 338 439 588 872 1080
31.8     268 346 461 679 837
38.1     222 286 381 558 685
50.8     165 213 282 410 501

Certificate Of Honor

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ISO9001/2015 Standard

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ISO 45001/2018 Standard

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PED Certificate

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TUV Hydrogen compatibility test certificate

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    • No. Size(mm)
    O.D Thk
    BA Tube Inner surface roughness Ra0.35 
    1/4″ 6.35 0.89
    6.35 1.00
    3/8″ 9.53 0.89
    9.53 1.00
    1/2” 12.70 0.89
    12.70 1.00
    12.70 1.24
    3/4” 19.05 1.65
    1 25.40 1.65
    BA Tube Inner surface roughness  Ra0.6
    1/8″ 3.175 0.71
    1/4″ 6.35 0.89
    3/8″ 9.53 0.89
    9.53 1.00
    9.53 1.24
    9.53 1.65
    9.53 2.11
    9.53 3.18
    1/2″ 12.70 0.89
    12.70 1.00
    12.70 1.24
    12.70 1.65
    12.70 2.11
    5/8″ 15.88 1.24
    15.88 1.65
    3/4″ 19.05 1.24
    19.05 1.65
    19.05 2.11
    1″ 25.40 1.24
    25.40 1.65
    25.40 2.11
    1-1/4″ 31.75 1.65
    1-1/2″ 38.10 1.65
    2″ 50.80 1.65
    10A 17.30 1.20
    15A 21.70 1.65
    20A 27.20 1.65
    25A 34.00 1.65
    32A 42.70 1.65
    40A 48.60 1.65
    50A 60.50 1.65
      8.00 1.00
      8.00 1.50
      10.00 1.00
      10.00 1.50
      10.00 2.00
      12.00 1.00
      12.00 1.50
      12.00 2.00
      14.00 1.00
      14.00 1.50
      14.00 2.00
      15.00 1.00
      15.00 1.50
      15.00 2.00
      16.00 1.00
      16.00 1.50
      16.00 2.00
      18.00 1.00
      18.00 1.50
      18.00 2.00
      19.00 1.50
      19.00 2.00
      20.00 1.50
      20.00 2.00
      22.00 1.50
      22.00 2.00
      25.00 2.00
      28.00 1.50
    BA Tube, No request about the inner surface roughness
    1/4″ 6.35 0.89
    6.35 1.24
    6.35 1.65
    3/8″ 9.53 0.89
    9.53 1.24
    9.53 1.65
    9.53 2.11
    1/2″ 12.70 0.89
    12.70 1.24
    12.70 1.65
    12.70 2.11
      6.00 1.00
      8.00 1.00
      10.00 1.00
      12.00 1.00
      12.00 1.50
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