What is the difference between ASTM A182 F53 and F55?

🔹What is ASTM A182 F53 material?

ASTM A182 F53 is a high-performance super duplex stainless steel forging grade (UNS S32750/Alloy 2507) suitable for forged pipes, fittings, flanges, and valve components, designed for high-strength, corrosion-resistant applications. Solution annealing must be performed at a temperature of at least 1880°F [1025°C] followed by water quenching to ensure maximum corrosion resistance.

 

🔹What is the equivalent of ASTM A182 F53?

The primary equivalent for ASTM A182 F53 is the UNS designation S32750. It is a 25% Chromium Super Duplex stainless steel, frequently referred to as Alloy 2507, and is also commonly classified under the European Werkstoff Number 1.4410 (X2CrNiMoN25-7-4). It is designed for superior corrosion resistance and high strength.

 

🔹What is ASTM A182 F55 Material?

ASTM A182 F55 is a high-performance super duplex stainless steel (UNS S32760) forging specification. It combines high strength (minimum 550 MPa yield) with excellent corrosion resistance, particularly in seawater and chloride environments. It is commonly used for valves, flanges, and piping components in demanding, high-pressure, and corrosive applications.

 

🔹ASTM A182 F53 VS. F55:Chemical Composition(Typical Values)

Element	F53 (S32750)	F55 (S32760)	Notes
Carbon (C)	≤0.03%	≤0.03%	Low carbon ensures excellent weldability
Chromium (Cr)	24–26%	24–26%	Enhances pitting corrosion resistance
Nickel (Ni)	6.0–8.0%	6.0–8.0%	Provides toughness and corrosion resistance
Molybdenum (Mo)	3.0–5.0%	3.5–5.5%	Higher Mo in F55 improves resistance to chlorides and crevice corrosion
Nitrogen (N)	0.24–0.32%	0.24–0.32%	Increases strength and chloride stress corrosion cracking resistance
Iron (Fe)	Balance	Balance	Main matrix element
Copper (Cu)	≤0.5%	≤0.5%	Improves acid corrosion resistance

 

🔹ASTM A182 F53 VS. F55: Mechanical Properties

Property	F53	F55	Notes
Tensile Strength (MPa)	750–950	780–1000	F55 slightly higher for high-strength applications
Yield Strength (MPa)	≥550	≥600	F55 offers higher safety margin
Elongation (%)	≥20	≥20	Both have similar ductility
Hardness (HB)	≤300	≤320	F55 achieves slightly higher hardness
Density (g/cm³)	7.8	7.8	Same
Service Temperature	≤300–350°C	≤300–350°C	Both stable at elevated temperatures

 

🔹ASTM A182 F53 vs. F55: Corrosion Resistance

Due to the intentional addition of tungsten (0.5%~1.0%) to its composition, ASTM A182 F55 (UNS S32760) exhibits slightly better corrosion resistance than F53 (UNS S32750), especially in harsh marine and acidic environments. Both are super duplex steels with high resistance to chloride pitting corrosion, but F55 is preferred due to its superior crevice corrosion resistance.

🔹ASTM A182 F53 and F55: Applications 

Oil & Gas Industry: Subsea pipelines, offshore platform equipment, valves, pumps, and structural components subjected to high pressures and sour environments.
Marine & Subsea Components: Propeller shafts, rudders, marine fasteners, and seawater handling systems, owing to their excellent resistance to chloride-induced stress corrosion cracking.
Chemical Processing Plants: Pressure vessels, heat exchangers, reactors, and piping systems exposed to acidic, chloride-rich, or corrosive fluids.
Desalination Plants: Components that require high resistance to harsh, concentrated seawater, such as reverse osmosis systems.

 

🔹ASTM A182 F53 and F55 stainless steel flanges Supplier

GNEE can supply ASTM A182 F53 and F55 duplex stainless steel in a wide range of product forms, including tubesheets, flanges, forged fittings, bars, and seamless/welded pipes, all manufactured to ASTM A182 / ASME SA182 standards.
Our F53 and F55 products are available in diameters from 100 mm up to 1500 mm, thicknesses from 10 mm to 150 mm, and lengths up to 6 m, with machined, polished, or hot-rolled finishes.

All products are supplied with EN10204 3.1/3.2 Mill Test Certificates and meet international inspection standards for quality assurance.