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In recent years, due to environmental and energy concerns, demand for smaller, thinner, and lighter materials has been growing in various fields and for various applications. In order to produce and sell steel foil, Toyo Kohan relies upon combining its core technologies of rolling, surface treatment, and lamination.

Steel foil is available in thicknesses of 25 μm to 100 μm (thicknesses over 100 μm can be produced as regular materials) and in sheet as wide as 930 mm. In addition, depending on each customer’s requirements, we can treat the steel foil with galvanizing or electrolytic chromic acid surface treatments.

Available sheet thickness and product width depends on the steel type (hardness) and plating type, so please be sure to refer to the Available Sizes page. Although there are many ways to use steel foil, using it helps to reduce the gauge from general steel materials or reduce costs from other metal foils.

SF : Steel Foil

Extremely thin and wide material can be provided

Reducing the gauge can help to make things lighter, thinner and smaller.Can be used as a core material or reinforcing material by combining it with other materials.

Properties of various surface treatments can be added

Depending on a customer’s goals and uses, various electroplating can be applied to the surface of steel foil.


Steel foil can be magnetized when used as a face material(core material).

Plating type and features

NamePlating typeCategoryFeatures
SF-HTElectrolytic chromic acid treatmentTin-free steel
  • Good paint adhesion
  • High-temperature baking finish possible (400℃)
  • Attractive surface appearance after painting
  • Resistant to alkaline chemicals
SF-ZnGalvanizationGalvanized steel sheet
(Silver Top)
  • Rust resistant
  • Good paint adhesion
SFCold rolled steel sheetCold rolled steel sheet
  • Post-plating possible

Coating composition

Basic Coating Composition Diagram


  • Construction materials (flexible duct materials)
  • Attery parts (square cross-section core material)
  • Food containers (core material)
  • Magnet applications, Whiteboards, Signboards, Magnetic toys (core material)
  • Lead wires, etc. (for post plating)
  • Cable armor applications
  • Various SIM materials, etc
Construction materials(flexible duct material)
Construction materials(flexible duct material)
Battery parts(Square cross-section core material)
Battery parts(Square cross-section core material)
Food containers(core material)
Food containers(core material)

Manufacturing process

Ultra-thin and wide steel foil is manufactured under strict quality control using state-of-the-art equipment and techniques.

Production Process


Properties will change depending on the type of plating, so please refer to the properties of the various products.
If you have any questions about other properties, please contact us.

Available Sizes

The available sizes differ according to the combinations of sheet thickness, steel type (hardness) and electroplating, so please contact us for details.


All of our products are made under strict quality control based on the various JIS standards.

Plating thickness and coating quantity

Plating thickness and coating quantity depend on the indicated designation and thickness for the various types of plating. Please refer to the standards for individual products.

As this is extremely thin steel sheet, thick plating is not available. Please consult with us if you need thick plating.

Substrate types and hardness

Substrates are not affected by the type of plating. Please refer to the table below.

ItemTemper codeHardness (Reference value)
Soft materialS58 or less58 or less
Hard material171 or more170 or more