Nickel is not easily oxidized at high temperatures, and has excellent corrosion resistance against alkalis and chemicals. Toyo Kohan provides highly functional nickel-plated steel sheet (Ni-Top) that makes the most of these properties of nickel by combining our unique surface treatment technology and rolling technology cultivated over many years to meet customer needs.
Nickel-plated steel sheet（Ni-Top）（Product catalog PDF/1.3MB）
Technology
The integration of the world class surface treatment and rolling technology realized high performance and high precision Ni-Top with excellent exterior appearance.
Superior Workability
Diffusion annealing process improves plating adhesion and corrosion resistance of the product and enhances the product’s processing suitability.
Quality
Toyo Kohan maintains stability of product function and quality by placing strict control on quality management.
Diffusion Aneealed Ni-Top
Diffusion Annealed（Semi-Gloss, Matte）
- Excellent heat and corrosion resistance.
- Diffusion annealing process reduces rusting caused by cracks at stamping process as it improves plating adhesion and workability of the plating layer.
Non-Diffusion Annealed Ni-Top
Nickel-plated only
- Excellent heat and corrosion resistance.
- Low contact resistance that is stable over time.
Applications
- Dry cell batteries
- Nickel hydride batteries
- Automotive parts
- Perforated core materials
- Electrical and electronic parts
- Stepper motor parts
- Stationery
Nickel is not easily oxidized at high temperatures, and has excellent resistance against corrosion by alkalis and chemicals. Toyo Kohan’s Ni-Top is a plated steel sheet that makes the most of these properties of nickel by combining our unique surface treatment technology and rolling technology cultivated over many years.
Due to its superior performance, Ni-Top is used in key parts of nickel hydride batteries and lithium-ion batteries for environmentally friendly hybrid and electric vehicles.
From dry-cell batteries to automotive parts, our earth-friendly, futuristic material Ni-Top is at your service.
Here too！
Batteries（Ni-Top）
Batteries have long been used to operate watches, toys, and remote controls, but now they are also used in environmentally friendly electric vehicles. Through the power of technology, Toyo Kohan continues to help protect the global environment.
We offer nickel plating solutions for a variety of battery and product designs.
We can also provide high-temperature heat treatment after processing.
Excellent resistance to deterioration, gasoline, heat, exhaust gases, etc.
Perforated core materials processed by our proprietary rotary press method are mainly used as battery parts for hybrid vehicles.
Properties
Plating Structure
Fe-Ni diffusion layer is derived by thermal process.
Diffusion Aneealed Ni-Top
Non-Diffusion Annealed Ni-Top
Electric Contact Resistance
| Resistance（mΩ） | Initial | After |
|---|---|---|
| Semi-gloss | 2.5 | 7.3 |
| Diffasion Annealed | 2.9 | 8.9 |
Over time：60℃×95%RH×2weeks
Comparison of Eriksen Corrosion Resistance
Diffusion annealed Ni-Top has excellent processing properties and has less cracks during processing. Therefore, the product is prevented from corrosion.
Type／Test item
- Cu-sulfate（5%）
- Solution Temp; 35℃
- Immersed Time ; 10s
- Eriksen; 7mm
Sheet Thickness 0.25mm, Plating Thickness; 3 µm
Charged Voltage and Tensile Shear Strength
No need for detailed settings due to wide range of welding conditions.
Comparison between as plated Ni-Top and dissusion annealed Ni-Top
Diffusion Aneealed Ni-Top
Nickel-plated only
Plating Thickness; 3 µm. JIS Z 2371 5% saltwater at 35℃ for 2 hours, tensile test distortion added（JIS specimen #5）
Available Sizes
Available Size Range
Plating Thickness
Standard plating thicknesses are shown in the table below. Please contact us if different plating thickness is required on each side.
- “Equal thickness plating” refers to sheet with the same amount of plating on both sides, while “Differential thickness plating” refers to sheet with different amounts of plating on each side.
- Ni thickness can be adjusted in increments of 0.5 μm. Please discuss your needs with us.
| Plating Thickness（same amount for Top/Bottom） | |
|---|---|
| Plating Thickness（μm） | Plating Weight（g/m²） |
| 0.25/0.25 | 2.23/2.23 |
| 0.5/0.5 | 4.45/4.45 |
| 1.0/1.0 | 8.9/8.9 |
| 2.0/2.0 | 17.8/17.8 |
| 3.0/3.0 | 26.7/26.7 |
| 4.0/4.0 | 35.6/35.6 |
| 5.0/5.0 | 44.5/44.5 |
| 6.0/6.0 | 53.4/53.4 |
| 10.0/10.0 | 89.0/89.0 |
For differential thickness plating or plating in increments under 0.5 µm, please discuss your needs with us.
Standards
Base material coil tempering classifications
A wide range of steel grades are available for selection, and standard characteristics can be controlled to meet various needs.
(Thick material equivalent to JIS G-3141 standard)
| Type | Tamper Grade | Code | Hardness | |
|---|---|---|---|---|
| HV | HR30T | |||
| SPCC | S（Standard Temper） | SB | Less than 116 | Less than 60 |
| SA | ||||
| SD | ||||
| SE | ||||
| 4（1/4 hardness） | SU4 | 116 to 151 | 60 to 70 | |
| SU5 | ||||
| 2（1/2 hardness） | 2 | 135 to 179 | 66 to 76 | |
| 2C | ||||
| 1 | 1 | More than 164 | More than 73 | |
| SPCD | S | SD | Less than 116 | Less than 60 |
Chemical Composition
（WT%）
| Type | C | Mn | P | S | Fe |
|---|---|---|---|---|---|
| SPCC | Less than 0.15 | Less than 1.00 | Less than 0.100 | Less than 0.035 | Bal |
| SPCD | Less than 0.10 | Less than 0.50 | Less than 0.040 | Less than 0.035 | Bal |
| SPCE | Less than 0.08 | Less than 0.45 | Less than 0.030 | Less than 0.030 | Bal |
Surface finish
Whether carefully polished or uniformly dull-finished, these rolls deliver a clean appearance to meet diverse needs.
| Surface Finish | Code | Description |
|---|---|---|
| Dull Finish | D | Lusterless and technically roughly finished. |
| Bright Finish | B | Smooth and flat finish. |