DALLA BETTA GROUP S.R.L.

STEEL

Other Specialties

Stainless steels are generally defined as ferrous alloys containing chromium, generally in quantities between 11 and 30 percent. Chromium gives steel a protective anti-corrosion film. Other alloys can be nickel, copper, titanium, molybdenum and niobium. The variation of each individual alloy affects the structural, mechanical and corrosion characteristics of the steel. Based on the crystalline structure, steels are divided into: -martensitic: they are chromium alloys in the percentage range of 11-18 percent with a significant quantity of carbon containing other elements such as manganese, silicon, chromium and molybdenum - ferritic: i.e. stainless steels containing only chromium in the percentage range of 12 -17 percent - austenitic: i.e. stainless steels containing nickel (8-14 percent ), chromium (17-19 percent) and a possible small quantity of molybdenum (2-3 percent) - austeno-ferritic (or duplex) i.e. stainless steels containing Chromium (18-26 percent), Ni (4.5-6.5 percent), and a possible small quantity of molybdenum (2.5-3 percent) The acronyms AISI 304 and AISI 316 indicate a high quality austenitic stainless steel containing Chromium (18 percent) and Nickel (10 percent). In fact, AISI 304 stainless steel is also defined by the acronym 18/10 precisely in reference to the quantity of Chromium and Nickel. AISI 304 is the steel generally most used for cutlery, hoods, kitchens, sinks etc. For other types of use and especially for difficult environments (ports, industrial areas, highly polluted environments) the certified AISI 316 steel is more suitable, which contains a percentage of approximately 3 percent molybdenum which ensures better resistance to chloride corrosion. For this reason it is the first choice steel used in naval carpentry.

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