ASTM A182 F44 specification for Flanges,forged fittings

ASTM A182 F44 refers to a  stainless steel that is part of the ASTM A182 specification, which covers forged or rolled alloy steel piping components, such as flanges, fittings, valves, and similar items used in pressure systems. The F44 grade, also known as UNS S31254, is specifically designed for high-strength applications and offers excellent corrosion resistance, particularly in chloride-rich environments.

UNS S31254
ASTM
Specification or Grade		 F 44
Corresponding Standard ASTM A182/A182M-2018
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Classification Austenitic Stainless Steel
Properties Corrosion Resistance

Chemical Element Composition Content (%) of A182 F44

Component C Si Mn P S Cr Ni Cu Mo N
Minimum Value – – – – – 19.5 17.5 0.5 6 0.18
Maximum Value 0.02 0.8 1 0.03 0.01 20.5 18.5 1 6.5 0.25

Mechanical Properties of A182 F44

thickness
t
mm		 Heat Treatment or Condition Tensile Strength
σb
Mpa		 Yield Point
σs
Mpa		 Elongation or Extension Rate
δ
%
All specifications solution treat and quench ≥650 ≥300 ≥35

 

Heat treatment Details 

Solution treat and quench, ≥1150°C
Cooling media, liquid
Quenching cool below 260℃

 

Approximate Comparison Table Equivalent grade of A182 F44

China United States Germany European Standard Sweden
GB Commercial Grade UNS DIN EN/DIN W-Nr. EN Numerical Grade SS
254SMo 254SMO S31254 X1CrNiMoCuN20-18-7 1.4547 X1CrNiMoCuN20-18-7 1.4547 2378

Product Scope of ASTM A182 F44:

  1. Flanges:

    • Weld Neck (WN), Slip-On (SO), Blind (BL), Threaded (TH), Socket Weld (SW), Lap Joint (LJ) flanges.

    • Available in pressure classes ranging from 150# to 2500# or higher, depending on size and application.

    • Used in high-pressure, high-temperature, and corrosive environments.

  2. Forged Fittings ASME B16.11

    • Elbows, Tees,  Caps, and other piping components.

    • Typically available in socket-welded, and threaded configurations.

    • Often used in chemical, marine, and offshore applications where resistance to stress corrosion cracking (SCC) and pitting corrosion is critical.

  3. Valves:

    • Gate, Globe, Ball, Check, and Butterfly valves.

    • Designed for use in extreme environments, such as seawater, desalination plants, and chemical processing systems.

  4. Other Components:

    • Forged bars and forged shafts made from ASTM A182 F44.

    • Bolting materials and other specialized forged products for high-strength, high-corrosion-resistance applications.