When welding recommendations are followed, the mechanical properties of welded joints are equal to those of non-coated steels. Metal coated steels can be welded by various welding techniques including different methods of resistance welding, laser welding and arc welding. The successful forming of metal coated steels depends on selections made regarding the geometry of component, steel grade, metal coating type and thickness, surface quality and protection, and a tool used in the forming. The bending performance of zinc coated sheets with coating masses up to 275g/m2 can be regarded as equal to that of corresponding uncoated sheets. The metal coating has an advantageous characteristic of serving as lubricant, which works greatly with low and moderate surface pressures taking place in forming. Small differences in surface behavior may require some changes, for instance in lubrication, tooling geometry and holding forces. Consequently usually the same forming processes as for uncoated steels can be applied for zinc-based coated steels without any substantial modifications to the process conditions. In general, zinc (Z) coating endures severe deformations thanks to its ductility and good frictional behavior.
In addition to these Zinc coating thicknesses defined according to EN10346:2015, the offering contains different asymmetric coatings, coatings with equal coating minimum mass per surface, and other OEM specifications that are available upon request. Guidance value for coating thickness per surface, typically (μm) Minimum total coating mass, both surfaces (g/m 2 ) * SSAB offers zinc coatings with different coating thicknesses, surface qualities and surface treatments to meet the demands of various applications.
Full corrosion protection is also achieved in areas that have been heavily formed because the peeling tendency of low-friction and tightly bonded coating is low. Therefore, in certain applications, batch galvanizing of finished components can be substituted by using Z450 or Z600 coated sheet steel thereby simplifying the overall process chain.īecause of the sacrificial nature of the zinc, the coating provides corrosion protection for areas of exposed steel surfaces, such as cutting edges and areas where coating has damaged (scratches, impacts, etc.). The Z600 coating (42 µm on both sides) can achieve a service life of up to 80 years. The corrosion resistance provided by the zinc coating is in direct proportion to the coating's thickness.
The composition of zinc coating consists almost entirely of zinc (>99%) and is lead free, resulting in finely crystallized zinc spangle that meets high requirements for visual appearance. These properties make zinc coatings well suitable to forming and demanding corrosive atmospheres. The continuous hot-dip galvanizing process offers a wide protection range from Z100 to Z600 in addition to a tight bond between the coating and the steel. Protection against rust with zinc coating Zinc coating (Z) produced on both sides by hot-dip galvanizing extends the service life of the end product by protecting the steel from corrosion.