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Classification of tinplate
1. Classification by Processing Technology
Single Cold-Rolled Tinplate (Tinplate)
Grades: T1, T2, T3, T4, T5, T6.
Production Process: The base plate is hot-rolled, cold-rolled once, and then annealed.
Thickness Range: Typically 0.17-0.5mm. Also known as Single Reduce (SR).
Double Cold-Rolled Tinplate (Tinplate)
Grades: DR-8, DR-9, DR-9M, DR-10.
Production Process: The base plate is hot-rolled, cold-rolled once, annealed, and then cold-rolled once again.
Thickness Range: Typically 0.12-0.36mm. Also known as Double Reduce (DR). Double cold-rolled tinplate offers thinner thickness and higher strength, reducing canning costs and is widely used in overseas markets. However, its production process is more sophisticated and complex, and its supply capacity is smaller than that of single cold-rolled tinplate.
2. Classification by Tin Coating Amount
Tinplate with Uniform Thickness (Tinplate)
Common tin coating amounts include 2.8/2.8, 5.6/5.6, 8.4/8.4, and 11.2/11.2. Tinplate with low tin coating amounts is generally used for containers with less stringent corrosion resistance requirements and those intended for painting. Tinplate with high tin coating amounts is generally used for cans with high corrosion resistance requirements and for containers intended for direct use without painting.
Tinplate with Differential Thickness (Tinplate)
Common tin coating amounts include 5.6/2.8, 8.4/2.8, 8.4/5.6, 11.2/2.8, 11.2/5.6, 11.2/8.4, and 15.1/5.6. Similarly, the difference in tin coating amount determines the packaging application for which it is suitable: Tinplate with low tin coating amounts is used for containers with general requirements, while tinplate with high tin coating amounts is used for applications requiring high corrosion resistance.
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