ASTM A815 UNS S31803 Duplex Steel Fitting ASME B16.9 Buttweld Duplex 2205 Equal Tee

ASTM A815 WPS31803 Duplex Steel Equal Tee ANSI ASME B16.9 Buttweld Pipe Fittings

ASTM A815 UNS S31803 Duplex Steel Fitting ASME B16.9 Buttweld Duplex 2205 Equal Tee" refers to a pipe fitting that is an equal tee (all three openings the same size) manufactured from duplex stainless steel grade UNS S31803 (commonly known as 2205), produced as a wrought buttweld fitting in compliance with ASTM A815 for material and heat treatment requirements, and dimensioned according to ASME B16.9 for factory-made buttwelding fittings.

Advantage: Duplex steels offers double the strength of 316L plus superior resistance to chloride corrosion and stress cracking.
Usage: The buttweld equal tee is widely used in offshore oil & gas, desalination, chemical processing, and heat exchanger systems to split flow into three equal paths under demanding corrosive conditions.

Equivalent Grades of ASTM A815 UNS S31803 Duplex Steel Pipe Fitting Equal Tee

Chemical Composition of ASTM A815 UNS S31803 Duplex Steel Pipe Fitting Equal Tee

ASTM A815 covers wrought ferritic, ferritic/austenitic, and martensitic stainless steel pipe fittings. For duplex grades (UNS S31803/S32205), it specifies:

• Fitting types: Elbows, tees, reducers, caps, lap joint stub ends, etc.

• Manufacturing processes: Seamless or welded (with welding filler if required)

• Heat treatment: Solution annealing followed by quenching (water or other rapid cooling)

• Corrosion testing: Intergranular corrosion test per ASTM A262 (Practice E) may be required

• Marking: Standard markings include ASTM A815, grade (e.g., WP-S31803 or S31803), size, schedule, heat number

Applications

• Chemical & petrochemical processing
• Oil & gas offshore platforms (seawater systems)
• Desalination plants
• Pulp & paper industry (digester, bleach plants)
• Marine exhaust and firewater systems
• Heat exchangers (as mentioned in your previous order – fin tube & tubesheet)