Stainless steel strip and sheet are mostly imported as single plate or in multi-plate form. The most popular type of import is flat plate, made of five elements: the flat plate of the steel, a secondary metal (such as zinc) that is twisted and bent into the shapes needed; an oxidizing agent, rolled steel back to shape, then finished with a coating of finishing steel. While this process produces a flat, smooth edge, a flat plate is also prone to flaring and bending, especially at high temperatures. In addition, raised grain areas and lack of straightness at the weld points can damage the weld and reduce efficiency.
Flat plate is typically preferred over other types of stainless steel sheet and strip since it is less susceptible to flaring and bending. Its strength is also enhanced by having higher carbon and chromium content, which improves corrosion resistance. Owing to its flat structure, a stainless steel sheet and strip can withstand many repeated cycles of heating and cooling. The process used for making flat plate and to build up layers of alloyed steel between the flat plate and the backing. This allows the plate to be thinner than the sheet metal. As mentioned, it can be shaped as desired, although it may get thicker as it cools.
In April 2021, the U.S. Federal Statistical System reported that steel imports in the country exceeded 2.1 million metric tons in March 2021, 65% higher than February’s 1.7 million metric tons import value. A major advantage of using a stainless steel sheet and strip for the purpose of forming the final parts of the frames is that the method is capable of providing for a tighter fit and greater strength than conventional hot rolled sheets. This is due to the fact that the process produces a tight, smooth edge with much better aesthetics. The additional edge that is formed by using the cold method is also ideal for use in creating more intricate designs.
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