Fittings and Flanges

Fittings and Flanges

Alloy 625 Flange and Fittings is a nonmagnetic, nickel-chromium alloy. It is used for its high strength, excellent fabricability (including joining), and outstanding corrosion resistance. Inconel 625 Flange has special quality finishing and durable for long life, high pressure and zero defects.

Chemical composition

GRADE   Cr Mo Co Nb+Ta Al Ti C Fe Mn Si P S Ni
INCONEL 625 MIN 20 8 3.15 Balance
MAX 30 10 1 4.15 0.4 0.4 0.1 5 0.5 0.5 0.015 0.015 Balance

Inconel 625 fittings and flanges have better resistance to pitting and crevice corrosion. They have a good resistance to chloride containing environment, high corrosion-fatigue strength, high tensile strength, and resistance to chloride-ion stress-corrosion cracking makes it widely used in seawater heat exchangers in refineries, power plants, and offshore topside services that often need this material.

Physical properties

Grade Density (g/cm3) Thermal Conductivity W.m -1.°K-1 Elastic Modulus (GPa) Specific Heat°K-1 Electrical Resistivity (nΩ.m)
Inconel 625 8.42 1354-1413 207 460 10.3

Specification of Flange

The specified ASTM Standard Specification for Nickel Alloys Flanges is ASTM B 564 with manufacturing standard such as ANSI/ASME B16.5, B16.47, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc.

According to application and uses in pipes and tubes, Alloy 625 flanges are broadly grouped into different sort, for example, Welding Neck Flange(WNF) & Long Welding Neck Flange(LWNF), Slip-on Flange(SOF), Lap Joint Flange(LJW), Blind Flange, Socket Welding Flange (SWF), Threaded Flange(THW), Plate Flange.

Inconel 625 Flange for the most part has different face type, for example, Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), blind flange, with various class rating as 50 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, din 2.4856, 25, 40 & ANSI B16.5.

Specification of Fittings

The specified ASTM Standard Specification for Inconel 625 pipe fittings is ASTM B 366, having Specific manufacturing Standards as ASME/ANSI B16.9, ASME B16.28, MSS-SP-43.

Inconel 625 pipe fittings and Inconel 625 tube fittings are categorically available are Elbow, Reducer, Tee, Coupling, Bend, Stub End, Cap, Nipple, Washer, Cross, Union etc. which are available in different types such as Welded, Seamless and Fabricated having thickness range from 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS available with NACE MR 01-75.

Mechanical Properties

Grade Tensile Strength Yield Strength Elongation
[MPA] [MPA] (% in 50mm) min
Alloy 625 758-827 345-414 25-30


Alloy 625 fittings and flanges due to high corrosive nature are mostly used in Heat Exchanger, Marine application, Nuclear reactor, Oil and Gas Industry, Chemical Industry and many other applications.

  • Aircraft ducting systems
  • Jet engine exhaust systems
  • Engine thrust-reverser systems
  • Specialized seawater equipment
  • Chemical process equipment

NOTE: Inconel 625 Fittings and Flanges is a registered trademark of  Special Metals Corporation.