What is the difference between F55 and 2507?
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What is equivalent to F55 material?
F55 material (ASTM A182 F55) is primarily equivalent to UNS S32760 (also known as Zeron 100) and EN 1.4501 (X2CrNiMoCuWN25-7-4). It is a highly alloyed super duplex stainless steel containing 25% chromium, molybdenum, and tungsten, designed for superior corrosion resistance in chloride environments.
What is equivalent to 2507 material?
2507 material (a super duplex stainless steel) is primarily equivalent to UNS S32750. It is widely recognized by trade names like SAF 2507 and standard specifications including Werkstoff No. 1.4410, ASTM A240/A790/A182, and F53. It offers 25% chromium and 7% nickel for superior corrosion resistance. It can be processed into various practical product forms, including sheets, coils, tubes, bars, and wires.
F55 vs. 2507 Stainless Steel:Chemical Composition (wt.%)
| Element | F55 (UNS S32760) | 2507 (UNS S32750 / F53) | Key Difference |
|---|---|---|---|
| Carbon (C) | ≤ 0.03 | ≤ 0.03 | Same low-carbon level |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 | Same chromium content |
| Nickel (Ni) | 6.0 – 8.0 | 6.0 – 8.0 | Same |
| Molybdenum (Mo) | 3.5 – 5.5 | 3.0 – 5.0 | F55 has higher Mo |
| Nitrogen (N) | 0.24 – 0.32 | 0.24 – 0.32 | Same nitrogen level |
| Copper (Cu) | 0.5 – 1.0 | ≤ 0.5 | F55 contains more Cu |
| Tungsten (W) | 0.5 – 1.0 | - | Only present in F55 |
| Iron (Fe) | Balance | Balance | - |
F55 vs. 2507 Stainless Steel:Mechanical Properties
|
Property |
F55 (S32760) | 2507 / F53 (S32750) | Notes |
|---|---|---|---|
| Tensile Strength (MPa) | 780 – 1000 | 750 – 950 | F55 slightly higher |
| Yield Strength (MPa) | ≥ 600 | ≥ 550 | F55 offers higher safety margin |
| Elongation (%) | ≥ 20 | ≥ 20 | Similar ductility |
| Hardness (HB) | ≤ 320 | ≤ 300 | F55 harder |
| Density (g/cm³) | 7.8 | 7.8 | Same |
| Max Service Temp. | 300–350 °C | 300–350 °C | Similar |
Corrosion Resistance
F55 offers higher corrosion resistance than 2507 due to its enhanced alloying with tungsten (0.5–1.0%) and higher molybdenum (up to 5.5%), which significantly improves resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC). The PREN (Pitting Resistance Equivalent Number) of F55 is typically ≥40–42, while 2507 generally ranges from ~38–40. This makes F55 better suited for high-chloride seawater, acidic media, and sour service (H₂S) environments where corrosion margins are critical.
High-Temperature Performance
Both F55 and 2507 provide excellent strength retention at elevated temperatures, with recommended continuous service temperatures up to approximately 300–350 °C, depending on environment and design code. Neither grade is recommended for long-term service above this range, as excessive temperatures may affect phase balance and corrosion resistance.
Applications
Because of its superior corrosion margin, F55 is commonly used in extreme service conditions, such as offshore platforms, subsea pipelines, seawater desalination plants, chemical reactors, and oil & gas processing equipment. In comparison, 2507 (F53) is widely applied in heat exchangers, pressure vessels, piping systems, pumps, and valves where excellent corrosion resistance is required but operating conditions are less aggressive. In practice, 2507 is often selected as a cost-effective alternative when F55's extra alloying is not strictly necessary.
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.
