Knowledge for Tinplate

Tinplate is a low carbon steel sheet (base metal), coated on both sides with a thin layer of tin, throughout on electrolytic process. Since the tin firmly adheres to the base metal, the product may be press molded, stamped, drawn or bent and shaped into complex forms without the tin coating peeling off. It has a beautiful, metallic luster as well as excellent properties in corrosion resistance and paintability.

Tinplate-Steel-Coil.jpg


1、Coating Structure

Coating-Structure-of-Tinplate.jpg


2、Features of Tinplate Products

Excellent Corrosion Resistance    By selecting a proper coating weight, appropriate corrosion resistance is obtained against container contents.
Excellent Paintability & Printability    Printing is beautifully finished using various lacquers and inks.
Excellent Solderability & Weldability    TIN PLATE is widely used for making various types of cans by soldering or welding.
Excellent Formability & Strength    By selecting a proper temper grade, appropriate formability is obtained for various applications as well as the required strength after forming.
Beautiful Appearance    Electrolytic ETP is characterized by its beautiful metallic luster. Products with various kinds of surface roughness are produced by selecting the surface finish of the substrate steel sheet.


3、Comparison of Properties of Tinplate

   Comparison of Properties of Tinplate
PropertiesTin Coat Weight g/m2
2.8Over 5.6
Bare Corrosion Resistance (sealed)(1)Rust Resistance
Acid Resistance
Alkali Resistance
Black Sulfide Stain Resistance
Stress Cracking Resistance
Paintability
Corrosion Resistance after Painting(2)
Filiform Corrosion Resistance
Paint Adhesion
Formabity
Solderability
Weldability
Heat Resistance(3)

◎: excellent ○: good △: fair

Note:
①Bare corrosion resistance is evaluated under tightly sealed conditions.
②Corrosion resistance after painting is evaluated by crosshatching corrosion tests.
③High-temperature baking after painting and printing may cause changes in material properties.


4、Advantages of Tinplate Cans in Food Packaging

Hygienic:   Provide excellent and non-toxic barrier properties to protect food products from impurities, bacteria, moisture, light, and odours.
Safe:   Low weight and high strength make food cans easy to ship and store.
Eco-Friendly:   Offer 100% recyclability; and significant cost benefits compared with aluminum.


5、K-Tinplate's Resistance to Corrosion

   K-Tinplate’s Resistance to Corrosion
Pickling Lag Value (PLV)Iron Solution Value (ISV)Tin Crystallite Size (TCS)Alloy-Tin Couple (ATC)
≤ 10 Sec≤ 20μg/3in2≤ 9#≤ 0.12μA/3in2

Note: If different coating tinplate, the side of higher coating weight should be tested.


6、Mechanical Properties of DR(Double Reduced) Tin Mill Products

   Mechanical Properties of DR (Double Reduced) Tin Mill Products
Temper GradeHardness (HR30Tm)Target Yield Strength/ MPa
Target ValueRange
DR-7M7171±5520
DR-87373±5550
DR-8M7373±5580
DR-97676±5620
DR-9M7777±5660
DR-108080±5690

Note: Making cans with DR materials, please pay a special attention to the rolling direction.

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