Alloy 625 Technical Information
Robert-James Sales, Inc.
Robert-James Sales, Inc.
Technical Information
  Piping Definitions Tube Stainless Steel Alloys Specifications Conversion Calculators 


Alloy 20
Alloy C-276
6061 T6
Alloy 200
Alloy 400
Alloy 600
Alloy 625
Alloy 800/800H/800HP
Alloy 825

Alloy 625

Chemical Composition %

C Cr Fe Ni Al Ti Co + TA
Max   Max Min Max Max  
0.10 20.0-23.0 5.0 58.0 0.40 0.40 3.15-4.15

Welded Pipe 1/2" - 8"
Butt Weld Fittings 1/2" - 8"
Flanges 1/2" - 8"
Bar 1" - 4-1/2"

ASTM 8443, 8705, B366, B446, B564
ASME SB443, SB705, SB366, SB446, SB564

Alloy 625 is a Nickel-Chromium alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures range from cryogenic to 1800 deg.F. Alloy 625 strength is derived from the stiffening effect of molybdenium and columbium 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.

Outstanding resistance to pitting, crevice corrosion, impingement corrosion 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.

Used for structures in contact with seawater and Subject to high mechanical stresses
Flue gas scrubbers components
Chimney linings
Superphosphoric acid production equipment
Sour gas production tubes
Offshore industry, marine equipment
High tensile, creep, rupture strength, outstanding fatigue and thermal-fatigue strength; oxidation resistance; and excellent weldability and brazeability make it a good choice in the aerospace industry

Tensile Strength (KSI) 120
Yield Strength (KSI) 60

KSI can be converted to MPA (megapascals) by multiplying by 6.895.

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