SF: Steel Foil

We apply various plating to the very thin and wide roll steel foil to add functions according to the use. Steel foil can be used as a core material or a reinforcing material, and as a face material we can magnetize it. We have a full lineup of steel foil with various functions from a thickness of 25 μm.

In recent years there has been a growing demand for "smaller", "thinner" and "lighter" materials in various fields and for various uses because of environmental and energy concerns.
Toyo Kohan has collected its core technologies of rolling, surface treatment and lamination to produce and sell steel foil. Steel foil is available in thicknesses of 25 μm to 100 μm (thicknesses over 100 μm can be produced as normal material) and widths up to 1,000 mm.
In addition, depending on a customer's uses (the properties required), we can treat the steel foil with galvanizing and electrolytic chromic acid.

* The sheet thickness and product width that we can provide depends on the steel type (hardness) and plating type, so please be sure to refer to the separate Available Sizes page.
Although there are many ways to use steel foil, reducing the gauge from general steel materials or using steel foil as an alternative to other metal foils can help to reduce costs.
Combining steel foil with other materials (resins, paper, etc.) can improve the rigidity and strength of core materials and reinforcing materials. In addition, it is also possible to add "magnetic" properties. As a result, steel foil is used in a wide variety of ways.


Features 1 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.

Features 2 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.

Features 3 Magnetizing

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

Plating types and features

Plating type Electrolytic chromic acid treatment Galvanization Cold rolled steel sheet
Category Tin free steel Galvanized steel sheet Cold rolled steel sheet
(Hi-Top) (Silver Top) (Top)
  • Good paint adhesion
  • High temperature baking finish possible (400℃)
  • Good surface appearance after painting
  • Resistant to alkaline chemicals
  • Rust resistant
  • Good paint adhesion
  • Post-plating possible

Coating composition


From standard industry products to leading-edge products, this product is used in the lives of people around the world.

Construction materials (flexible duct material)

Battery parts (Square cross-section core material)

Food containers (core material)

  • Magnetic uses: White boards, signboards, magnetic toys (core material)
  • Lead wires, etc. (for post-plating)
  • Cable armor
  • Various SIM material
Production Process

In order to assure the production of ultra-thin and wide steel foil, Toyo Kohan uses the newest equipment and technology to produce steel foil under strict quality controls.


The properties will change depending on the type of electroplating, 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.

Galvanization production range
Electrolytic chromic acid treatment production range
Cold rolled steel sheet production range
<Hard material>
Cold rolled steel sheet production range
<Soft material>
Standard Products

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

Electroplating thickness and coating quantity

The electroplating thickness and coating quantity depend on the nominal designation and thickness displays of the various types of electroplating, so please refer to the standards for the various products.
* Note: Thick electroplating is not possible because this is extremely thin steel sheet. Please consult with us if you need thick electroplating.

Substrate types and hardness

Substrates are not affected by the type of electroplating, so please refer to the table below.

Item Temper code Hardness (reference value)
Soft material S 58 or less 115 or less
Hard material 1 71 or more 170 or more