Stainless Steel Pipe Fittings

Duplex And Super Duplex Stainless Steels – Twice As Strong As Austenitics By

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Yaang duplex stainless steel offer an excellent combination of strength and corrosion resistance, meaning you can significantly reduce material thickness and cost in a host of applications.
Our duplex stainless steel is unmatched in the industry and our offering covers a full palette of duplex stainless steels for use in diverse industries and applications. 
The high mechanical strength of duplex stainless steel grades is a result of the duplex microstructure and the alloying with nitrogen. This high strength gives opportunities for reducing both weight and cost as a thinner material can be used. Low nickel content of the duplex stainless steel grades makes them price stable.
Grades 2507 and 4501 are regarded as super duplex stainless steel grades. They are highly alloyed and have a corrosion resistance comparable to high performance austenitics like 254 SMO. Typical applications for super duplex are desalination plants, seawater systems, flue-gas cleaning, umbilicals, storage tanks and pressure vessels.

By lowering total material weight, you also lower transportation and assembly costs, reducing environmental impacts even further – making duplex stainless steel a genuine material of the future.

Grade properties

Duplex stainless steel grades have a ferritic-austenitic microstructure, with a phase balance of approximately 50% ferrite and 50% austenite. Duplex stainless steel grades combine many of the beneficial properties of ferritic and austenitic stainless steels. The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking.

Other characteristic properties of duplex stainless steel grades include good abrasion and erosion resistance, good fatigue resistance, high-energy absorption and low thermal expansion.

Duplex stainless steels generally have good weldability and can be welded using most of the welding methods used for austenitic stainless steels:
Shielded metal arc welding (SMAW)
Gas tungsten arc welding TIG (GTAW)
Gas metal arc welding MIG (GMAW)
Flux-cored arc welding (FCW)
Plasma arc welding (PAW)
Submerged arc welding (SAW)
Laser welding
Resistance welding

High-frequence welding

Corrosion resistance
Duplex stainless steel grades are superior to standard austenitics with regard to stress corrosion cracking resistance, and duplex grades are also good in a number of acidic and alkaline environments.

Yaang’s duplex stainless steel offering is unique: for a given austenitic stainless steel grade there is a duplex counterpart that not only provides similar corrosion resistance but also twice the strength.

About Zhejiang Yaang Pipe Industry Co., Limited

Established in 2008, Zhejiang Yaang Pipe Industry Co., Limited is a professional organizer and one-stop-shop supplier for stainless steel piping system products, including stainless steel pipes and stainless steel tubes, stainless steel forged flanges and butt-welding stainless steel pipe fittings, stainless steel pipe fittings, stainless steel elbows, stainless steel tees, stainless steel reducer, stainless steel stub end, stainless steel gaskets, stainless steel fasteners, stainless steel valves, Sanitary Services, stainless steel bar, etc. in China. We have devoted to providing the best solutions of steel materials and industrial equipment for our respected customers.
We supply not only commonly used stainless steel materials (SS304/L,SS316/L,SS321), but also duplex and super duplex steel 1.4547, 1.4462, 1.4410 (S31254,S31803,S32750,S32760), special austenite stainless 310S, 347H, 347, 317L, 904L… Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining,Sewage treatment, Natural gas and Pressure vessels and other industries.

Yaang stainless steel products are according to national standard GB/T12459, GB/T13401, U.S. standard ANSI/ASME B16.9, ANSI/ASME B16.5/B16.47, ANSI/ASME B16.11, ANSI/ASME B36.19M/ B36.10M, ASME B16.20,British standard BS,Germany standard DIN,Japan standard JIS…, The purpose built nonstandard or special use products as per customer’s demand,  we will try our best to satisfy it.
Source: Yaang Pipe Industry (

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Duplex Stainless Steel

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