EN 10312 is an European Standard specifies the technical delivery conditions for light gauge welded stainless steel tubes from austenitic, austenitic-ferritic, and duplex stainless steels, primarily for water application, including water intended for human consumption, supplied in straight lengths and suitable for used with related fittings. The standard is applicable to the size range from 6mm to 267mm outside diameter made of stainless steel grades taken from EN 10088-2. It establishes clear guidelines for manufacturers on the dimensions, material properties, and testing procedures that must be met to ensure that the tubes will perform as intended and resist corrosion over their lifetime.