What is the difference between duplex and stainless steel

Masteel supply a large range of different steels globally, including duplex and super duplex stainless steel. We stock various grades of both duplex and super duplex stainless steel. If you have any questions about these metals, please contact us.

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Helena St. What is the difference between austenitic and duplex stainless steels? Super Duplex Austenitic Stainless Steels — Thanks to their predictable levels of corrosion resistance and excellent mechanical properties, austenitic stainless steels are the most commonly used grades of stainless steel. This family of stainless steels can be divided rather loosely into three groups: Common chromium-nickel series Manganese-chromium-nickel-nitrogen series Specialty alloys Easily recognised by their non-magnetic properties, the completely austenitic grain structure means that they are very formable, readily welded and retain their ductility down to cryogenic temperatures.

The higher strength and corrosion resistance also means that many parts made using duplex stainless can be thinner than their austenitic counterparts providing lower costs. Due to their excellent corrosion resistance , increased strength, and affordable pricing, duplex stainless steels are popular in a variety of industries and markets, including:.

Unified Alloys offers a range of corrosion-resistant stainless steel products to help meet the needs of industries across Canada.

Our expert advisors are available to help you determine the best alloys and products to help you meet your goals. Call today. For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser. An Introduction to Duplex Stainless Steels A look at the uses for duplex stainless steel, its history, and the benefits it offers. However, cost is only one part of a bigger picture.

Could duplex stainless steel work in your next project? It is possible to prevent galvanic corrosion by practicing several rules. Materials with similar corrosion potentials must be selected, the electrical connection must be broken down, by means of insulation, and lastly, the application of a coating to both the materials.

The application of proper coating prevents the stripping of metals from either the cathode or anode, thereby improving their resistance to corrosion and effectively protecting both the metals. Passivation is a phenomenon that occurs in stainless steels that contain higher contents of chromium in their alloy. Since duplex stainless steels contain high levels of chromium in their alloy, it is possible for the surface of these components to form a passivated oxide layer over the surface of the steel.

However, some stainless steel alloys possess insufficient chromium content to form this self-repairing passivation oxide layer, leading to the material getting corroded by oxidation.

Oxidation is a common problem associated with low chromium stainless steel.