Ferralium 255 offshoreFerralium 255 power Ferralium 255 chemical

Langley Alloys

Duplex Stainless Steel

UNS 31803 (F51), UNS 32205 (F60) Alloy 2205, UNS S32550 (F61), UNS S 32750 (F53) Alloy 2507, and UNS 32760 (F55)

Deriving the Duplex name from the presence of both Austenite and Ferrite in similar proportions, Duplex Stainless Steels combine excellent corrosion resistance with high strength. The typical mechanical properties would be double that of a single phase austenitic grade such as 316, while, for example, offering superior stress corrosion cracking resistance in chloride solutions.

Standard Duplex Stainless Steels typically have a 22% Chromium and 5% Nickel and in the 1960's Langley Alloys developed the first 25% Chromium Duplex alloy, Ferralium 255, and coined the phrase Super Duplex.

Duplex Stainless Steel is at the heart of the Langley Alloys business, with Langley Alloys being the ONLY supplier today offering its customer the complete choice on Duplex, and Super Duplex grades, with stock in the following grades:

22Cr Duplex:  UNS S31803 (F51) and UNS S32205 (F60)  Alloy 2205. 
25Cr Super Duplex  grades:  Alloy 255, UNS S32550 (F61), Alloy 2507, UNS S32750 (F53) Alloy 2507 and UNS S32760 (F55)

Alloy Common Name Related Specifications Tensile Strength Proof Stress Elongation
European United States
ASTM A479/A182
UNS S32205
UNS S31803
Alloy 2205 2205 1.4462 F60 F51 655

Alloy 2205


  • • Alloy 2205 to MLA-MPS-22V-BAR
  • • EN 10088-3 1.4462
  • • ASTM A182 UNS S31803 Forgings Grade F51
  • • ASTM A182 UNS S32205 Forgings Grade F60
  • • ASTM A240 UNS S31803 Sheet and Plate
  • • ASTM A479 UNS S31803 Bar
  • • ASTM A479 UNS S32205 Bar
  • • ASTM A276 UNS S31803 Bar
  • • ASTM A76 UNS S32205 Bar

Langley Alloys

Langley Alloys, (Langley Alloys), located in Vancouver, Washington, is a full service metals distributor specializing in duplex and super-duplex stainless steels as well as Austenitic XM-19 alloys...... Metals ideal for chemical, marine, pulp & paper, mining, phosphate fertilizer production and pollution control applications. Our sales staff has over 50 years experience in the metals industry. Let them put that expertise to work for you.

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Langley Alloys carries a full line of products in super-duplex stainless steel Ferralium 255 (UNS S32550, S32520, F61), UNS S32750 (Alloy) 2507, F53) & UNS S32760 (ZERON® 100, F55). Langley Alloys prides itself as a service oriented company that can meet the high demands of our customers. With our many years of experience and close relationships with vendors, we can provide finished products directly from engineering drawings.

Using advanced technology such as abrasive water jet and plasma cutting, slitting and CNC machining, Langley Alloys can save you money and time by providing cut-to-order products in many configurations. Langley Alloys - Portland is ISO 9001:2008 certified and provides full chemical and physical certification to ASTM, ASME, ANSI, AWS, NACE, NORSOK.