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High Strength and High Conductivity Copper Alloy KLF™ 170

CDA No. 19170
KLF™ 170 has electrical conductivity equivalent to C19400 and strength equivalent to 42 alloy.

Good Points

  1. Has high electrical and thermal conductivity. Electrical conductivity is equivalent to C19400 class.
  2. Has high strength with good electrical conductivity. Has excellent strength of 42 alloy class. (Temper ESH)
  3. Has good stamping formability and etching formability, resulting in no smut contamination in the etching process or
    pre-plating process.
  4. Has good solderability and platability. Protrusions in the silver plating are reduced.
  5. Has good bare bondability by gold wire and copper wire. Also applicable for direct bear wire-bonding without plating.

Nominal Compositions

Cu-0.7Ni-0.13P-0.1Fe-0.1Zn (mass%)


Fig. Softening resistance of KLF170
Fig. Softening Resistance of KLF™ 170

1. Physical Properties

Specific Gravity 8.9
Coefficient of Thermal Expansion
17.5 x 10-6/K
Thermal Conductivity (293K) 267 W/m.K
Electrical Resistivity (293K) 26.5 nΩ.m
Electrical Conductivity (293K) 65 %IACS
Modulus Elasticity (293K) 110 GPa

* The above are typical characteristics.

2. Mechanical Properties



Tensile Strength



Vickers Hardness
MHv: 4.9N
SPH 580~680 5 min 170~210
ESH 610~730 5 min 180~220

* The above tensile strength and hardness are our standard specifications. We will adjust these specifications by your requests.

3. 90°V-type Bend-formability (MBR)

Temper Good
SPH 0 0
ESH 1.0 2.0

* The above are typical characteristics.
The value slightly varies depending on the thickness of specimens.


Leadframe for QFP, QFN package, Inner-frame for Heat spreader etc.


Not used cadmium (Cd), lead (Pb), mercury (Hg), six value chrome (Cr+6), polybrominated biphenyl (PBB), Polybrominated biphenyl ether (PBDE) restricted with RoHS etc.


Kobe Steel, Ltd. Advanced Materials Business

Copper Rolled Products Unit

Copper Flat Rolled Products Sales Department