MITSUBISHI MATERIALSCopper & Copper Alloy Business

MITSUBISHI MATERIALSCopper & Copper Alloy Business


Products information

HRSCHigh strength and high conductivity heat-resistant copper alloy

Standerd No.
C1862(Tube) CDA: C18620(Tube),C18625(Strip, Plate, Rod/Bar, Wire, Forging)

HRSC has high thermal conductivity and high electrical conductivity.
And it has an excellent balance of strength and workability.
HRSC maintains initial strength inspite of heat -treatment at 800℃×10min due to the grain grow is suppressed.
HRSC is able to be provided at various shapes (such as plate,strip,rod/bar,pipe,wire and hot forged).

Positioning of Alloy

HRSC is a heat-resistance copper alloy .And it has high erectric conductivity (equal to Phosphorus deoxidized copper‐C1220) and strength (par with brass‐C2600 and Phosphor bronze‐C5191) .

Main features

  1. Has high thermal and electrical conductivity and also has an excellent barance of strength and workability.
  2. Good bending workability, press workability, and drawing workability.
  3. Maintains initial strength inspite of heat -reatment at 400℃
  4. Maintains initial strength inspite of brazing at 800℃ ×10min..
  5. Possible to process reflow-Sn plating with excellent surface quality and whisker resistance

Main applications

  1. Heat sink, heat spreader
  2. Heat exchanger, EcoCute high pressure piping
  3. Power relay
Eco Cute
heat exchanger
Plate for sputtering target
Spring and Contact for power relay
Heat sink for power module

Chemical composition

(Weight %)

Cu Co P Sn Ni
Rem. 0.27 0.08 0.04 0.04
* Including inevitable impurities and trace additive elements

Physical properties

(Weight %)

Property Representative Value
Specific Gravity (293K) 8.9
Coefficient of liner expansion( ×10-6/K:293~573K) 17.1
Thermal Conductivity(W/(m・K):293K) 330
Electrical Conductivity(%IACS:293K) 85
Modulus of Elasticity(kN/mm2 : 293K) 125
Poisson Ratio(293K) 0.33

Mechanical properties (Sampling Direction ; L.D.)

Mechanical properties
Shape Strip* Rod/Bar Forging
Size(mm) 0.65 Φ10 -
Temper H H As aged
Tensile Strength
525 540 380
0.2% Yield Strength
510 520 255
5 15 40
Vickers Hardness
(160) 165 115
Electrical Conductivity
85 85 85
* reference value

Softing resistance

Even after brazing heat treatment (800 °C x 10 minutes), there is no coarsening of the metal structure and it has thermal stability compared with C1220.

Heat treatment condition: 800 °C × 10 min (equivalent condition for brazing in furnace)
a) HRSC (G.S. 10 µm) 0.2% proof stress of 110 N/mm2
b) C1220 (G.S. 100 µm) 0.2% proof stress of 22 N/mm2

Heat resistance: cross-sectional structure and strength after brazing heat treatment

Softening Resistance: isochronal annealing curve

Stress relaxation resistance

Test method: JCBA-T309: 2004
Exposure temperature:150℃
Bending stress: 0.2% yield strength 80%
Evaluation: The mean value of TD and LD

Bending workability

It has good bending workability and it can cope with various processing.

  • Strip product 90 ° W bending (bending evaluation, safety bending radius)
  • Strip product 180 ° tight bending
  • Rod/Bar product 180 ° bending appearance
90 ° W bending JCBA T307:2007 Sample size: Width 10mm×Length 30mm Load: 9807N
Temper Sampling Direction Bending Inside Radius (mm) R Evaluation
0.0 0.1 0.15 0.2 0.3 0.4 0.6 0.8 1.0 2.0 R/t
H G.W. 0.2
B.W. 0.6
EH G.W. 0.5
B.W. 0.9
Method of evaluation: ◎Good (Acceptance)、○Minor rough surface (Acceptance)、△Major rough surface (Acceptance)、▲Minor crack (Rejection)、×Major crack (Rejection)

Bending test 180°(B.W.) R/t=0
Temper: H, Thickness0.64mm

Strip: 180°adhesion bending

Rod/Bar Temper: 0, φ25mm

Bar: 180°bending appearance

Fatigue properties

It has good fatigue property.


Strip & Plate

Rolled product Sales Dept.


Bar & Rod

Group Ⅲ, Extruded Product & Wire Rod Sales Dept.