Stainless steel can be defined as steel grades that have a particularly low content of harmful elements such as phosphorus, sulfur, arsenic or tin.
In the production of stainless steels, elements like sulphur, arsenic or tin are removed from the melt. This can be done by adding chalk, for example. This lime binds harmful elements to a slag which can be skimmed off.
When harmful accompanying elements have been reduced to a minimum, unalloyed steel is the result. However, despite its purity, it is still susceptible to rust.
By adding at least 10,5% Chromium to the melt, Stainless steel is produced. The more aggressive the environment, the more alloy elements have to be used and depending on the environment, different elements have to be added to the mix.
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