904L Pipe Fittings & Flanges

Alloy 904L is a non-stabilized austenitic stainless steel that has less concentration of carbon. Alloy 904L is mixed with copper to increase the resistance to strong reducing acids i.e. sulfuric acid. It has the ability to resist stress corrosion cracking and crevice corrosion. Alloy 904l is non-magnetic and possesses exceptional forming and welding characteristics.
Other contents found in it include molybdenum and nickel in high abundance. This grade provides nice oxidation resistance, though it loses its structure when placed under high temperatures, especially above 400° C.
Alloy 904L can be hardened using thermal procedures. It can be solution heat-treated at 1090 to 11750° C, giving the instant cooling right after. Under cold atmospheres, these grades can be easily molded to a tiny radius. These alloys hold the ability to be machined following any general procedures.
Its major applications include
• Wires used in electrostatic precipitators
• Oil refining industries
• Seawater cooling equipment
• Gas scrubbing machines
• Pulp and paper making industries
• Acetic, phosphoric and sulfuric acid processing equipment

Standards – 904L Pipe Fittings & Flanges

Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy FittingsASTM B 366
Standard Specification for Wrought Austenitic Stainless Steel Piping FittingsASTM A 403
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature ServiceASTM A 182

Mechanical Properties – 904L Pipe Fittings

Tensile , Yield & Elongation shall conform to their respective parent material standards.

Mechanical Properties – 904L Flanges

Tensile Strength : Unit – ksi (MPa) , Minimum
Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum
Elongation : in 2″, Unit : % , MinimumValues as per ASTM A 182

Condition & GradeTensile StrengthYeild StrengthElognation
Annealed 71 (490)31(215)35

Chemical Industry

Elbow / Bends

904L Elbow / Bends

Long Radius / Short Radius

45˚ , 90˚ & 180˚


904L Reducers




904L Caps


904L Stub Ends




904L Flanges




Lap Joint


904L Fasteners