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Langley Alloys

Super Duplex Alloys

Ferralium 255, 2507, and UNS S32760

In the 1960’s Langley Alloys developed the first commercially available 25% Chromium Duplex alloy, FERRALIUM® 255, and coined the phrase Super Duplex. It pioneered the use of a deliberate nitrogen addition in order to improve ductility and corrosion resistance.

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Super Duplex alloys are characterised by higher Chromium content than standard duplex stainless, typically around 25% and a PREN > 40 (PREN = Cr% + 3.3Mo% + 16N%) and offer improved corrosion resistance and better mechanical properties.

Today, Langley Alloys offers all 3 grades of Super Duplex.

FERRALIUM® 255-SD50 (UNS S32550, S32520, F61), UNS S32750 (Alloy 2507, Alloy 2507, F53) & UNS S32760 (ZERON® 100, F55) are all available from stock in Round Bar, Plate, Sheet, and Pipe.

Custom forgings can also be manufactured on short lead times.


Ferralium 255 - Super Duplex Super Duplex Ferralium 255
Sets a new bench mark for Super Duplex as the first to state 570N/mm2 as the minimum 0.2% Proof Stress. Suited to many applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.

Super Duplex 2507 2507 - Super Duplex
Has excellent corrosion resistance to a wide variety of media.

Super Duplex UNS S32760 UNS S32760 - Super Duplex
Has excellent corrosion resistance to a wide variety of media.

Super Duplex Ferralium 255

Super Duplex Ferralium 255
Sets a new bench mark for Super Duplex as the first to state 570N/mm2 as the minimum 0.2% Proof Stress. Suited to many applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.

Super Duplex 2507

Super Duplex 2507
Has excellent corrosion resistance to a wide variety of media.

Super Duplex UNS S32760

Super Duplex UNS S32760
Has excellent corrosion resistance to a wide variety of media.

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.

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.