bedra18160

Copper Chromium Zirconium

Characteristics:

It combines excellent electrical and thermal conductivity with enhanced mechanical strength and resistance to softening at elevated temperatures, achieved through precipitation hardening. Zirconium prevents electrode sticking during spot welding of galvanized steel, while a minor addition of silicon (Si) further improves the alloy's thermal stability.

Typical applications:

Due to its superior thermal stability, this alloy is a preferred choice for resistance welding applications, including welding wheels, spot welding electrodes, seam welding wheels and tips, and contact tips. It is also used for mold inserts in non-ferrous metal casting molds.

Standardization and composition

UNS	C18150/C18160
EN	/
JIS	/
GB	/
Cu	balance
Cr	0.5-1.5%
Zr	0.02-0.20%
Si	≤ 0.01-0.06%
Fe	＜ 0.1%
Ni	＜ 0.1%

Physical properties①

Note①：The testing temperature is 20℃. Note②：The testing temperature range is 20℃ to 300℃.

Density (g/cm³)	8.9
Melting point(℃)	1080
Electrical conductivity (%IACS)	75
Thermal conductivity (W / m x K)	324
Coefficient of thermal expansion② (10-6/K)	16.5
Modulus of elasticity (GPa)	117
Softening temperature(℃)	550

Fabrication Properties

Note③：C37700 = 100% Note④：C36000 = 100%

Capacity for being cold worked	Good
Capacity for being hot worked	Good
Brazing	Good
Resistance welding	Good
Forgeability rating ③	80%
Machinability rating④	20%

Mechanical Properties⑤

Note⑤：bedra technical standards

Temper	Diameter (mm)	Tensile Strength (MPa min.)	Yield Strength (MPa min.)	Elongation (% min.)
TH04	8 ≤ Φ ≤ 12	520	480	8

Dimension Tolerance and Delivery Forms

Note⑥：The tolerances listed in the table are specified as all plus or all minus. When tolerances are specified as plus and minus (±), half the values given.

			Straight bar
Diameter (mm)	Tolerance⑥ (mm)	Ovality (mm)	Length (mm. max.)	Straightness (mm/m max.)
8 ≤ Φ ≤ 10	0.06	0.03	4000	1.0
10 ＜ Φ ≤ 12	0.10	0.05	4000	1.0