Duplex Steel

duplex material

The most challenging sites are situated in or close to the Arctic oceans, the place frequent storms intensify the extremely corrosive exposure to seawater. Molybdenum-containing alloys, particularly duplex and tremendous duplex stainless steels, last longer than virtually all different in these troublesome situations.

Super- ferritic grades with very low interstitial levels and high chromium and molybdenum contents have superior resistance compared to standard ferritic grades. However, although these steels have discovered sure purposes, their success has been limited. This kind of stainless steel is often used within the heat exchangers, oil and fuel industry, chemical processing gear, offshore platforms, pressure vessels, and boilers. It combines the most effective attributes of ferritic and austenitic stainless steel and offers excellent strength as well as ductility with high corrosion resistance.

We have thousands tons stock of stainless steel and coil with various size and grade,mainly include austenitic stainless steel, martens stainless steel (including precipitation hardened stainless steel sheet & coil), ferritic stainless steel, and duplex stainless steel.

Characteristics of Stainless Steel Sheet and Plate:
High corrosion resistance
High strength
High toughness and impact resistance
Temperature resistance
High workability, including machining, stamping, fabricating and welding
Smooth surface finish that can be easily clean

What is duplex stainless steel used for?

They are used for their good mechanical properties in the as-cast (and therefore as- condition) and/or their excellent corrosion resistance properties (particularly to stress corrosion cracking).

These grades had been developed to cut back the intergranular corrosion issues within the early high-carbon austenitic stainless steels. Duplex castings had been produced in Finland in 1930, and a patent was granted in France in 1936 for the forerunner of what would finally be often known as Uranus 50. It turned apparent that a balance of ferrite and austenite had better resistance to chloride stress-corrosion cracking than a completely austenitic microstructure. The designation of “duplex” comes with the biphasic structural constitution of the austenitic and ferritic section of each in equal parts. This kind of stainless-steel is considered finest and it is broadly chosen over the austenitic and ferritic steel due to its increased strength.

Stainless steels have an extended historical past of application involved with because of their excellent corrosion resistance. Applications embrace a range of conditions including plumbing, potable water and wastewater treatment, desalination, and brine therapy. Types 304 and 316 stainless steels are commonplace supplies of construction in contact with water. However, with growing chloride contents, greater alloyed stainless steels such as Type 2205 and super austenitic and tremendous duplex stainless steels are used.

  • There is certainly a unbroken demand for increased productiveness in welding, while maintaining the parent materials properties.
  • In the new era of duplex stainless steels , this impact reduces the problem of extra ferrite in the HAZ.
  • However, although these steels have found sure applications, their success has been restricted.
  • The final twenty years have seen the introduction of the “super” stainless steels.


As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless-steel. For chloride pitting and crevice corrosion resistance, their chromium, molybdenum and nitrogen content material are most necessary. Stainless steel is now used as one of the supplies for tramlinks, together with aluminium alloys and carbon steel. Duplex grades are typically preferred because of their corrosion resistance and better energy, allowing a discount of weight and a long life in maritime environments.

We produce ASTM/ASME Grade 304, Grade 304L,304h, 316, 316L, 316H, 316TI, 321, 321H, 309S, 309H, 310S, 310H, 410S, 2205, 904L, 2507, 254, gh3030, 625, 253MA, S30815, 317L, Type 317, 316lN, 8020, 800, 800H, C276, S32304 and others special requirement stainless steel grade.

Which Types Of Stainless Steel Are Magnetic?

Duplex stainless steels have decrease nickel and molybdenum contents than their austenitic counterparts of comparable corrosion resistance. Due to the lower alloying content, duplex stainless steels could be lower in cost, especially in occasions of excessive alloy surcharges. Additionally, it might typically be attainable to reduce the part thickness of duplex chrome steel, because of its elevated yield energy in comparison with austenitic stainless-steel.

They can’t be strengthened by chilly work to the same diploma as austenitic stainless steels. In the 70’s, the introduction of continuous casting in chrome steel production has contributed to decrease production costs and better quality.

Does duplex stainless steel rust?

As with all corrosion-resistant alloys, duplex stainless steels can suffer corrosion when exposed to suitably corrosive conditions. As they contain a higher chromium content than standard 3xx grades, their Pitting Resistance Equivalent Number (PREN) is higher, indicating increased resistance to pitting corrosion.

In the brand new technology of duplex stainless steels , this impact reduces the problem of excess ferrite within the HAZ. There is definitely a unbroken demand for increased productivity in welding, while maintaining the mother or father materials properties. The last 20 years have seen the introduction of the “tremendous” stainless steels.

duplex material
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