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EPD: Steel with aluminium-zinc coating, 0.5 mm, 3.925 kg/m2 (Lindab Steel AB)
Aluminium-Zinc (AZ) – AZ is a metal coated steel for applications up to corrosion class C4. The coating consists of 55% aluminum, 43,4% zinc and 1,6% silicon dioxide The surface can be treated with anti-fingerprint protection to prevent discoloration during handling and facilitate shaping. The surface is initially glossy and rose-patterned, but after being outdoors for a while it becomes greyish and dull. The rose pattern can vary between front and back and between different rolls. The AZ coated steel is delivered in wide coils, slit coils, or sheets. It can be processed by conventional processing operations such as bending, drawing, clinching, profiling, stamping, welding etc. and contains approximately 20% of recycled scrap steel. Aluminium-Zinc coating protects the steel from corrosion in two ways. It serves as a protective layer keeping oxygen and water away from the steel, but it also acts as a cathodic protection. This means that at cut edges or in case of damages through the metal coating, the coating will sacrifice itself and react to form protective compounds and block further corrosion processes. The metal coating covers the steel on both sides. In addition, a metal coating can improve formability, resistance welding properties and paintability.
sweden, OCLEPD