AISI 316L Stainless Steel

It is a carbon steel alloyed with percentages of chromium, nickel, manganese, molybdenum and other elements in a lower quantity. The molybdenum increases its resistance to corrosion allowing its use in very hard conditions as for example in presence of sulphuric acid solutions, of organic acids, of chlorides, etc. Optimum weldability (with no necessity of a subsequent solution heat-treatment). The possible treatment of decontamination is highlighted in the code by the change of letter from “Y” to “N”. It is recommended for the use in chemical industries, oil industries, textile industries, paper industries, plastic industries, naval industries and food industries for the working of particularly aggressive products.

Decontamination o passivation - Pickling

The decontamination according to ASTM A/380-88 or passivation is a chemical treatment used to restore the natural passive state of stainless steel surfaces, removing traces of less noble metals or of various deposits, possible causes of corrosion starting. It is made by dipping the manufactured article in a nitric acid bath thinned for some minutes. Pickling is made instead when it is necessary to remove the fl akes of oxides resulting from welding or from high thermic treatments.
This treatment, much more aggressive than the previous one, can be made mechanically (siliceous sand, steel balls, etc...) or chemically (thinned sulphuric acid or thinned nitric plus hydrofl uoric acid).

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