Electrolytic tinplate coil is low-carbon mild steel sheet or coil coated on both surfaces with tin that is applied in continuous electrolytic operation. The surface of electrolytic tinplate coil is normally subjected to a passivation treatment and to oiling.
Single reduced cold-rolled tinplate coil refers to those steel coils where the steel substrate has been reduced to the desired thickness in a cold-reduction mill and subsequently annealed and temper rolled.
Double reduced cold-rolled tinplate coil is given a partial cold reduction to reach an intermediate gauge, then annealed and given another cold reduction to the final gauge prior to coating with tin. The resulting product is stiffer, harder, and stronger than single reduced cold-rolled tinplate coil.
According to the difference of the tin plating thickness on the front and back of the thin steel coil, tinplate coil can be divided into two types: equal thickness tinplate coil and differential thickness tinplate coil. Among them, equal thickness tinplate coil refers to the same tin plating on the front and back of tinplate.
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