F61 (255) Duplex Stainless Steel
UNS S32550 | ASTM A182 F61 | ASTM A276/A479 | ASTM A240 | NACE MR0175F55 (25Cr) Duplex Stainless Steel
F61 (also known as Ferralium 255) Super Duplex is an austenitic-ferritic (duplex) stainless steel. Consisting of 25% Chromium and 5% Ni. A main difference in F61 (Ferralium 255) is the alloy is more suited in acidic environments over F53 (2507). Like other duplex grades F55 combines high corrosion resistance and strength over austenitic stainless steels, while also having superior pitting resistance. F55 does suffer from embrittlement and loss of toughness, when exposed to prolonged use in applications or environments below -50°F or above +600°F, this is why duplex is not suitable for exposure outside of these ranges.
Common industry/applications are: Oil & Gas equipment, Chemical and Biofluid processing, Pressure Vessels, and Mechanical and Structural.
Product forms include round bar, plate & sheet, and forgings.
Standards
- UNS S32550
- ASTM A182 F61
- ASTM A276/A479
- ASTM A240
- NACE MR0175
Characteristics
- For use in -50F to +600F temperatures.
- Excellent corrosion & pitting resistance.
- Good cryogenic (-50F) impact strength
Physical Properties
- Density: 0.282LB/in³ (7.81g/cm³)
- Melting Point: 2550–2630°F (1399–1443°C)
- Modulus of Elasticity: 30.0x10⁶psi (200 GPa)
- Magnetic Permeability: less than 1.05 @ 68°F (20°C)
Chemical Composition
PREN: Pitting Resistance Equivalent Number: An Equation to correlate pitting resistances of product, based on chemistry. This equation is: Cr + (3.3 x Mo) + (16 x N) – PREN = greater than 40
C
Mn
S
P
Si
Cr
Ni
Mo
N
Cu
Mechanical Properties: Wrought & Forged Bars
Charpy Impact: Temp: -50°F (-46°C) / Value: ≥33Ft-Lbs (≥45J).
Typical mechanical properties, actual minimums may vary based on processing.
KSI (MPa)
KSI (MPa)
HRC (BHN)
Specialty Steel Supply makes all reasonable efforts to ensure the accuracy and correctness of the data found on this website and the associated documents but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.
Stainless and Alloys
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Specialty Steel Supply Inc. is one of the largest distributors of austenitic, precipitation hardened, duplex and martensitic stainless steels. We have a wide range of products and types of stainless steel round bar and our well trained staff offers many years of experience in all aspects of the steel industry. Our ability to procure and source metals from all parts of the world allows us to stay competitive in a global marketplace. We are committed to developing and servicing just in time inventory programs.
Specialty Steel Supply
19201 Circle Lake Drive
Pinehurst, Texas 77362
info@specialtysteelsupply.com
Business Hours
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