Duplex stainless steels are a family of stainless steels. These are called duplex  grades because their metallurgical structure consists of two phases, austenite (face-centered cubic lattice) and ferrite (body centered cubic lattice) in roughly equal proportions. 

They are designed to provide better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, and higher strength than standard austenitic stainless steels such as Type 304 or 316. 

They are therefore used extensively in the offshore oil and gas industry for pipework systems, manifolds, risers, etc. and in the petrochemical industry in the form of pipelines and pressure vessels.

Mechanical Property	Value
Proof Stress	450 Min MPa
Tensile Strength	620 Min MPa
Elongation A50 mm	25 Min %
Hardness Brinell	290 Max HB

    Duplex stainless steels are usually selected for their high mechanical properties and good to very high corrosion resistance (particularly to stress corrosion cracking).
    Architecture：Stockholm's waterfront building ，Louvre Abu Dhabi，La Sagrada Familia
    Infrastructure：Helix Bridge，Singapore ，Cala Galdana bridge ，Hong Kong–Zhuhai–Macau bridge and undersea tunnel ，sea walls, piers, etc.  
    Oil and Gas：a wide range of equipment: flowlines, manifolds, risers, pumps, valves, etc.
    Pulp and Paper：digesters, pressure vessels, liquor tanks, etc.
    Chemical engineering：pressure vessels, heat exchangers, condensers, distillation columns, agitators, marine chemical tankers, etc.

We are a well known worldwide supply and export Duplex stainless steels in following countries：,Italy, Philippines, France，Ireland, Portugal, Gambia, Thailand, Ukraine, United Kingdom, Netherlands, South Africa, Spain, Turkey, Libya, Romania, Puerto Rico, Azerbaijan, United Arab Emirates, Pakistan, Ghana, Slovakia, Germany, Saudi Arabia, Afghanistan, Bolivia, Switzerland, Bangladesh, Taiwan, Oman, Egypt, Greece, Norway, Singapore, Bulgaria, Estonia, Belgium, Yemen, Hong Kong, Ecuador, Sri Lanka, Nepal, Belarus, Finland, Gabon, Iran, Canada, Argentina, Lebanon.