bedra18155

Chromium Zirconium Copper

Characteristics:

A high copper alloy with higher additions of Cr and Zr than C18150. This alloy is strengthened by precipitation hardening and it shows very good electrical and heat conductivity combined with high strength and high thermal stability after heat treatment.

Typical applications:

This alloy shows very good thermal stability and much higher softening temperature, which can significantly improve the service life of contact tips.

Standardization and composition

UNS	/
EN	/
JIS	/
GB	/
Cu	Balance%
Cr	1.5-2.0%
Zr	0.02-0.20%
Fe	0.1%
Si	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 temperature(℃)	1080
Electrical conductivity(%IACS)	75
Thermal conductivity(W/(m·K))	324
Coefficient of thermal expansion ②(10⁻⁶/K)	16.5
Modulus of elasticity(GPa)	117
Softening temperature(℃)	550

Fabrication Properties

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

Cold workability	Good
Hot workability	Good
Brazing	Good
Resistance welding	Good
Machinability ③	20%
Forgeability ④	80%

Mechanical Properties ⑤

Note⑤: bedra technical standard

Temper	Diameter(mm)	Tensile Strength(min.MPa)	Yield Strength(min.MPa)	Elongation(min.A%)
TH04	8.0 ≤ Φ ≤ 12	500	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 max.)	Length (mm max.)	Straightness (mm/m max.)
8.0 ≤ Φ ≤ 10	0.06	0.03	4000	1.0
10 ＜ Φ ≤ 12	0.10	0.05	4000	1.0