A182 F44 material equivalent

What is A182 F44 material?

ASTM A182 (Standard Specification for Forged or Rolled Alloy Steel Pipe Flanges, Fittings, Valves, and Parts for High-Temperature Service). A182 F44 is a high-molybdenum austenitic stainless steel, also known as UNS S31254 or 6Mo. It is a forged material under the American ASTM A182 standard. Its main characteristic is its extremely high resistance to pitting and crevice corrosion, making it particularly suitable for corrosive environments containing chlorides (halides), such as seawater. It is commonly used in the manufacture of high-pressure pipe fittings, flanges, and other components to withstand harsh marine environments.

 

What is F44 equivalent material?
Alloy 254SMO / 6Mo / F44 is a fully austenitic alloy containing 6% molybdenum and offering excellent corrosion resistance in a wide variety of aggressive, aqueous environments. It replaces the conventional, austenitic stainless steels (AISI 316 and 317), where their capabilities are pushed to their performance limits.

 

What is the grade of F44 casting?
F44 castings typically correspond to Grade 4A in the ASTM A995/ASTM A890 standards. They are a type of super austenitic stainless steel casting with a PREN value of approximately 42–45, exhibiting excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking in seawater, chlorides, and highly corrosive media. They are widely used in marine engineering, pump and valve castings, and chemical equipment.

 

A182 F44 Stainless Steel Flange Specifications

Pipe, SMLS& Welded	Tube , SMLS&Welded	Sheet/Plate	Bar /Rod	Forging /Flange	BW Fittings
ASTM A312	ASTM A269	ASTM A240	ASTM A276/A479	ASTM A182	ASTM A403

 

A182 F44 Chemical Composition, %

Ni	Fe	Cr	Cu	Mo		N
17.5~18.5	Balance	19.5~20.5	0.5~1.0	6.0~6.5		0.18~0.22
C	Mn	P	S		Si
0.002max	1.0max	0.030max	0.010max		0.80max

 

A182 F44 Mechanical Properties

Material Grade	Yield Strength, Min(Mpa)	Tensile Strength, Min(Mpa)	Elongation,Min( %)
254SMO	300	650~820	28

 

What are the corrosion resistance properties of A182 F44?
A182 F44 exhibits excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking (SCC). It is particularly suitable for seawater, brine, acidic media, and high-temperature, high-pressure chlorine-containing environments, making it a high-end material choice for marine and chemical systems.

 

What are the differences between A182 F44 and A182 F51/F53?
F44 has a significantly higher corrosion resistance rating than F51 (2205) and F53 (2507), especially in high-temperature, high-chlorine environments. However, its material cost is also relatively higher, making it suitable for critical parts with extremely high risks of corrosion failure.

 

Is A182 F44 magnetic?
A182 F44 has a fully austenitic structure and is essentially non-magnetic in the solution-annealed state. Slight magnetism may only appear after severe cold working.

 

What product forms are commonly made from A182 F44?
It is mainly used for flanges, valve bodies, pipe fittings, forged rings, and pressure vessel connectors, meeting the strict requirements of ASTM A182 for high-corrosion-resistant forgings.

GNEE currently has ASTM A182 F44 in stock, including flanges, valve bodies, pipe fittings, forged rings, pressure vessel connectors, etc. In addition, we offer a variety of surface treatments for you to choose from.
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