Tin Plate
Electrolytic Tin Plate (ETP) consists of cold-rolled sheet steel. It owes its name to an ultra-thin coating of tin which imparts a whitish gloss to the material. This coating is electrolytically applied and protects the material from corrosion.
Surface appearance and finish
|
Commodity |
Letter Symbol |
Classification |
Specific feature |
|
|
B |
Bright finish |
A luster surface provided by a flow-brightened tin coating on a smoothly grindstone finished steel base. |
|
Single cold- reduced |
R |
Stone finish |
A luster surface provided by a flow-brightened tin coating on a steel base characterized by a directional grindstone pattern. |
|
S |
Silver finish |
A luster surface provided by a flow-brightened tin coating on a coarse dull finished steel base. |
|
|
M |
Matte finish |
A dull surface provided by a non-melted coating generally on dull finished steel base. |
|
|
Double cold- reduced products |
R |
Stone finish |
A luster surface provided by a flow-brightened tin coating on a steel base characterized by a directional grindstone pattern. |
Temper designation
The temper designation gives a guide to the hardness (and stiffness) of products.
For Single Reduced products, the softer tempers are normally produced from Batch Annealed (BA) feed, while the harder tempers are offered only from Continuous Annealed (CA) feed.
Continuous Annealed (CA) products normally have more consistent mechanical properties throughout the length of coil than Batch Annealed (BA), due to the nature of the process involved.
|
Designation |
|
Aimed Rockwell |
Applications |
|
Single Reduced |
T1
T2
T2.5
T3
T4- CA
T5- CA |
46- 52
50- 56
52-58
54-60
58-64
62-68 |
Nozzles, spouts, toys, ends of 5 liters gallon oil cans and other applications involving extra- deep drawing. Small square cans, drawn fish can (oval), ring caps, and other requiring moderate- deep drawing. Crowns, top plugs for paint cans and other applications where moderate- deep drawability and hardness are required. 5 liters gallon oil can body, sundry cans, large cans, and other applications requiring a proper degree of hardness. Can ends and bodies where comparatively high strength is required. Can ends and bodies where a combination of high hardness, strength and good formability is desired. |
|
Double Reduced |
DR8
DR9 |
70-76
73-79 |
Bodies and ends for small- diameter cans requiring high strength. Bodies and ends for large diameter cans requiring high strength |
Coating Weight
Tinplate is produced either equally-coated or differentially-coated. Tin coating mass is measured in grams of tin per square meter of steel surface area (g/m2). The common designations are listed below together with their nominal tin coating mass specification. Available of other tin coating is subject to enquiry.
|
Type |
Coating designation |
Normal coating |
|
Equally coated weight |
# 25 |
2.8/2.8 |
|
Differentially coated weight |
#25/50 |
2.8/5.6 |