DUPLEX & SUPER DUPLEX STAINLESS STEELS


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Duplex & Super Duplex Stainless Steels
Duplex & Super Duplex Stainless Steels
Duplex & Super Duplex Stainless Steels

Duplex and super duplex steels are formed from an approximately 50/50 mixture of austenitic and ferritic phases and are sometimes referred to as austenitic-ferritic stainless steels.

Duplex stainless steels combine the best attributes of both austenitic and ferritic stainless steels and provide high strength/ductility with good corrosion resistance to corrosion (including stress corrosion cracking). This gives them a significant advantage over 300 and 400 series stainless steels.

Super duplex stainless steels are generally more complex, more highly alloyed materials with PREn (Pitting Resistance Equivalent number) = 40.0 and offer even higher strength and corrosion resistance making them suitable for very demanding applications such as offshore marine engineering.

A range of duplex and super duplex stainless steels are stocked and released to various specifications (including NORSOK) in a variety of forms. Bar (stocked from ½” to 10” diameter), Forgings (blocks, rings and stepped forgings), Sheet, Plate, Pipe, Tube, Closed die forgings, Castings, Flanges, Bolting, Welding Consumables. Super duplex wire, strand and wire rope available under the trade name AMINOX® 255 (UK Patent 2354264B).

Nearest Equivalent Specification

Available Products

Super Duplex Stainless Steel. 25% chromium super duplex (austenitic/ferritic) steel with 0.75% tungsten and copper. Good strength/ductility combined with high corrosion resistance. For Oil & Gas, defence, pollution control, chemical/ petrochemical and marine applications.

EN
ASTM

1.4501
A135 F55

Duplex Stainless Steel. 22% chromium duplex (austenitic/ ferritic) steel (2205 type) with moderate/good strength and good general corrosion/ stress corrosion cracking resistance. For Oil & Gas, brewing, power generation and chemical industry applications.

EN
ASTM

1.4462
A135 F51

Super Duplex Stainless Steel. 25% chromium copper-free super duplex (austenitic/ferritic) steel (also known as 2507). Good strength and ductility combined with high marine corrosion resistance. Primarily used for Oil & Gas and marine applications.

EN
ASTM

1.4410
A135 F53

Super Duplex Stainless Steel. High performance 25% chromium super duplex (austenitic/ferritic) steel with 1.75% copper. Good strength/ductility combined with high resistance to all forms of corrosion. For Oil & Gas, defence, nuclear, chemical/petrochemical and marine applications.

EN
UNS
ASTM

1.4507
32550
A135 F61

Super Duplex Stainless Steel. High performance, high strength 25% chromium super duplex (austenitic/ferritic) steel strands and wire ropes with outstanding corrosion resistance. For swimming pool flume/ducting supports, mast rigging, mooring and architectural supports.

EN
UNS

32550
S32550

Other Stainless
Steels

See Aerospace Alloy & Stainless Steel Sheet, Aerospace Stainless Steel Bar, Precipitation Hardening Stainless Steels and Stainless Steel.