Kobe Steel’s Copper

Manufacturing High Performance and High Quality Original Alloys
World-Class In-House Facilities for Copper Production
Commitment to New Materials and Technologies
Awards and Recognitions

Production of Original Alloys Offering High Functionality and Quality

With the advancement of CASE technologies, demand for copper continues to grow.
At Kobe Steel, we manufacture original alloys with high performance and high quality, and provide surface treatment technologies.

World-Class
In-House Facilities for Copper Production

Hot Rolling Mill

4-high Cold Rolling Mill (No. 10 Rolling Mill)

20-high Cold Rolling Mill (No. 1 Rolling Mill)

Annealing Furnace

Continuous Annealing/Polishing Line

Slitter Line

Commitment to New Materials and Technologies

We meet customer needs through material development and surface treatment technologies tailored to a wide range of applications.

Alloys Developed by Kobe Steel (Partial List)

Alloy Name	Chemical Composition (wt%)	Features	Applications
KFC^®	Cu-0.1Fe-0.03P	Excellent electrical and thermal conductivity Higher strength than pure copper Excellent bare bonding properties Good solder wettability and plating characteristics Softening begins above 400℃; better heat resistance than pure copper and tin-added copper	Lead frames for transistors and LEDs, IGBT heat sinks, heat spreaders, radiation plates for BGAs, internal radiation frames, etc.
SuperKFC^®	Cu-0.3Fe-0.1P	Good electrical and thermal conductivity; conductivity higher than C194 Combines high strength and high conductivity, suitable for various applications No crystal residue (smut) formation during plating pretreatment or etching Excellent stamping and etching workability Excellent plating characteristics (Ag, Ni, Sn, solder, etc.); achieves high-reflectivity Ag plating needed for high-intensity LED frames Good solder wettability	Lead frames for QFP and QFN packages and LEDs, internal heat dissipation frames, etc.
KLF^®-5	Cu-2.0Sn-0.1Fe-0.03P	Heat resistance approximately 100℃ higher than phosphor bronze Electrical conductivity approximately 40–50% higher than brass and phosphor bronze Excellent solder wettability and plating properties Better stress corrosion cracking resistance than phosphor bronze Strength comparable to phosphor bronze	General-purpose terminals and small terminals for automotive use; small terminals and connectors for consumer and industrial equipment
KLF^®-170	Cu-0.7Ni-0.13P-0.1Fe-0.1Zn	Good electrical and thermal conductivity; conductivity equivalent to C194 No smut formation during plating pretreatment or etching Excellent stamping and etching workability Good solder wettability and plating properties; suppresses protrusions from Ag plating	Lead frames for QFP and QFN packages, internal heat dissipation frames, etc.
CAC^®60	Cu-1.8Ni-0.4Si-1.1Zn-0.1Sn	Yield strength ≥ 580 MPa; supports terminal downsizing Better bending workability than conventional Ni-Si alloys, allowing for more flexible design Excellent stress relaxation resistance; compliant with SAE Class 4 Good conductivity (44% IACS); suitable for high-current areas	Small automotive wire harness terminals, specialized terminals for consumer and industrial equipment, internal heat dissipation frames, etc.
CAC^®5	Cu-0.8Ni-1.2Sn-0.07P	General-purpose copper alloy optimized for terminals with wire barrels Especially good stress relaxation resistance, suitable for automotive use; complies with JASO-C400 Strength level equivalent to phosphor bronze for springs (C5210-1/2H) and brass (C2600-EH) Registered with the Copper Development Association (CDA)	Small automotive wire harness terminals, specialized terminals for consumer and industrial equipment, lead frames for mini-mold transistors, etc.
CAC^®75	Cu-2.5Ni-0.55Si-1.0Zn-0.2Sn	Yield strength ≥ 750 N/mm²; suitable for small terminals Yield strength equivalent to low-beryllium copper; conductivity approximately 3 times that of phosphor bronze Excellent bending workability and low anisotropy allow for flexible design Excellent stress relaxation resistance; suitable for automotive use	Small automotive wire harness terminals, specialized terminals for consumer and industrial equipment, etc.

Awards

	Technology Development	Award Details
2024	Introduction of KOBELCO-TQM	Japan Quality Recognition Award

Contact Us

You can reach us by clicking the inquiry button.

Inquiry