Alloy 625(Inconel 625)

Corrosion Resistance
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Sourceable Materials


ALLOY625 is a low-carbon Ni-Cr-Mo-Nb alloy which shows excellent resistance to a variety of corrosive media.

  • outstanding resistance to pitting, crevice corrosion, erosion and intergranular attack
  • almost complete freedom from chloride-induced stress-corrosion cracking
  • good resistance to mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acids
  • good resistance to alkalis and organic acids
  • good mechanical properties

Stock Form and Sizes

※ ◆1000㎜ ◎2000㎜ ▲3000㎜ ■3500㎜ ●4000㎜ ★2500㎜~3990㎜

Round Bars Specification:ASTMB446/B564※ ASME SB446/SB564※ AMS5666 NACE MR0175(ISO 15156)
※B564/SB564 Apply to Forged Bar Only
Stock Specification: Grade 1(Annealed)

size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135
size 140〜350
140 145 150 160 165 170 180 190 200 210 220 230 250 280 300 330 350
Hex barsSpecification:ASTM B446
10 13 14 17 19 21 22 24 26 27 30 32 36
Nuts and washersSpecification: Nut JIS B1181 Class1 Washer, JIS B1256 Normal Series Grade.A
M5 M6 M8 M10 M12 M16 M20

※Please enquire about grades and sizes not in stock.

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plate Pipe/Tube Welding Rod & Wire
Min Max Min Max
Inconel625 9.52〜400 0.25~101.6

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
* We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

Corrosion resistance

For optimal corrosion resistance the material must be in a clean condition and free from all kinds of contaminants before any fabricated component is placed into service. Under these conditions ALLOY625 exhibits excellent corrosion resistance in a wide variety of media:

  • excellent resistance to pitting and crevice corrosion in chloride-bearing media
  • essentially resistant to chloride-induced stress-corrosion cracking
  • high resistance against impingement and erosion corrosion
  • practically no corrosive attack in marine and industrial atmosphrers. High resistance to seawater and brackish water, even at higher temperatures
  • high resistance against intergranular corrosion following thermal treatment and welding
    The solution-annealed version (grade 2) shows good resistance to many corrosive gas atmospheres:
  • good resistance to carburization and to oxidation under
  • resistance to nitridation
  • good resistance to halogen containing gases and to hydrogen chloride


The soft-annealed version of Nicrofer 6020 hMo (grade 1) is preferred for applications in the chemical process industry, in marine engineering and in pollution control equipment for environmental protection.

Typical applications are:
  • superphosphoric acid production equipment
  • nuclear waste reprocessing equipment
  • sour gas production tubes
  • piping systems and sheathing of risers in oil exploration
  • offshore industry and marine equipment
  • flue gas scrubber and damper components
  • chimney linings

For high-temperature applications, up to approximately 1000 °C (1830 °F), the solution-annealed version of alloy 625 (grade 2) can be used in accordance to the ASME code for pressure vessels. For design calculations for equipment for use within the temperature range of approximately 500 ~ 1000 °C (930 ~ 1830 °F) the loss in ductility resulting from prolonged exposure within that temperature range must be kept in mind

  • components in waste gas systems and waste gas cleaning plants exposed to higher temperatures
  • flare stacks in refineries and offshore platforms
  • recuperators and compensators
  • submarine diesel engine exhaust systems
  • superheater tubes in waste incineration plants
  • cladding of waterwall sections and superheater tubes in waste incineration plants by overlay welding

Chemical composition

  Ni Cr Fe C Mn Si Mo Co Al Ti Nb+Ta P S
min 58.0 20.0         8.0       3.15    
max   23.5 5.0 0.10 0.50 0.50 10.0 1.0 0.40 0.40 4.15 0.015 0.015

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Soft Annealed 413 827 30  
Typical Values at RT Hot Worked 588 980 45 210
Typical Values at RT Soft Annealed 539 931 45 180

Please contact us with any questions about reference or value of plate and pipe.
※Grade 1
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plates/Sheets Pipe/Tube
Seamless Welded
B446 B443 B444 B704/705
ASME SB446 SB443 SB444  
JIS NCF625 H4553 G4901 H4552  
DIN 2.4856 17752 17750 17751  
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