Context. The first duplex casting was made at Avesta in Sweden in 1930, when the idea of ​​duplex stainless steels was the subject of discussion within the industries. Over the last 30 years duplex steels have evolved significantly and have been used significantly. The evolution of steel production techniques mainly influenced this take-off. Duplex stainless steels are a combination of many of the beneficial properties of ferritic and austenitic steels. Early grades of duplex steel had excellent performance characteristics, but also had some limitations. The metallurgical processes of the time were not suitable for producing grades with the right austenite-ferrite balance. These early duplex steels also had a high carbon content due to the unavailability of efficient decarburization techniques. Due to these limitations products using these materials were limited to specific applications. (Alvares-Armas, 2008) The advancement of manufacturing techniques in the late 1960s and early 1970s led to the fabrication of modern duplex steels. The introduction of vacuum and argon-oxygen decarburization (VOD and AOD) was the main factor leading to this massive development of duplex steels during this period. With the advancement of these techniques it has been possible to obtain steels with low carbon content by mixing with high contents of nitrogen and chromium in equilibrium with austenite and ferrite. This eliminated many shortcomings of older duplex steels. The alloy content provided corrosion resistance while the duplex microstructure helped prevent chloride stress cracking under severe conditions. And these duplex steels also possessed good welding ability. Modern duplexes were used for offshore and near shore industries where conditions are severe and... middle of paper... cutting using a flame torch using oxygen and propane along with iron powder is also used for cut steel. This method is clean and fast. Plasma jet cutting is another method that uses a column of ionized gas together with an electric arc through a small orifice. The gas produces extremely high temperatures to melt the metal. (Chater, 2010)FinishingFinally, the surface is finished to the required standard using different methods.Type of finish MethodMatte finishHot rolling, annealing and descalingBright finishFirst hot rolling and then cold rolling on polished rollsHighly reflective finishCold rolling in combination by annealing a controlled atmosphere oven, by grinding with abrasives, or by polishing to a finely honed surfaceMirror finish Polishing with progressively finer abrasives, followed by extensive polishing