Electrolytic chromium coated steel also called Tin Free Steel (TFS) is an electrolytic chrome plated steel consisting of a thin layer of chromium and a layer of chromium oxide deposited on the steel base.It has a beautiful, metallic luster as well as excellent properties in corrosion resistance and paintability. Coating Structure of Tin Free Steel

The thickness ranks from 0.5mm-3mm. They want to check which thickness is more suitable for them and make the right decision.