Guidelines for Ordering Tinplate and Usage Precautions

Guidelines for Ordering Tinplate and Usage Precautions

It is recommended that consultations are held before the purchaser embarks on using a new product. The intended purpose should be clearly stated, together with details of the method of fabrication of the part.
Any subsequent modifications should also be discussed with the supplier; in turn, he should notify the user of any alterations in his practice which would significantly affect how the tinplate would be used.
The following factors may particularly need to be taken into account in ordering
cut sheet, whole coil, or slit coil. Selection will depend on the end use manufacturing operation, thus coil may be more economical in material and may be more suited to an in-line continuous process. However, it must be borne in mind that a coil may contain some defective material, which is normally sorted and removed during production of individual cut sheets, so that inspection is important.
The continuously cast steel now commonly used for the tinplate production is chemically in accordance with the most severe applications; the formability of the product of course imposes specific formulations in accordance with the producer’s practice. For Food, MR Type is recommended. SPCC can be used for General Line (Non-food) contents.
This must be selected carefully in relation to the degree of formability required in the product. Whether the steel strip is continuously annealed, or batch annealed can have a bearing on the mechanical properties.
When special decorative effects are required in the finished product, a matt finish may be specified; for general can-making operations, a bright or stone finish is customary. Various manufacturers employ their own designations for types of finish.
Selection of a tin coating mass depends on the severity of the corrosion conditions which may be encountered in use. In general, heavier tin coatings offer better protection. For tinplate used in the manufacture of DWI cans (and to some extent unlacquered DRD cans) a criterion is lubrication requirements. The thickness of the alloy layer may also need to be borne in mind. Differential coatings may have economic advantages when the corrosive conditions to be encountered by the two surfaces differ in severity. The application of an organic coating is of course to be taken into account in the global system performance, for determining the optimum tin coating. For differential tincoating, higher tincoating side should be specified with marking required. Usually higher tincoating is facing down with parallel marking.
Unless otherwise specified, the manufacturer will apply a standard passivation procedure. Special treatments appropriate to the application, to which the tinplate will be put, may be requested in consultation with the supplier.
Light, medium or heavy should be specified. Heavy oiling may create problem for lacquering or printing and may require oven drying adding to the cost of production.

Usage Precautions for Tinplate

Scroll to Top