bedra18150

Copper Chromium Zirconium

Characteristics:

This high-copper alloy, containing small additions of chromium (Cr) and zirconium (Zr), is strengthened by precipitation hardening. This treatment significantly enhances the alloy's mechanical strength while maintaining its exceptionally high electrical and thermal conductivity. Furthermore, the zirconium content helps prevent electrode sticking during the spot welding of galvanized steel.

Typical applications:

It is extensively used for spot and seam welding electrodes, particularly cap-style resistance welding electrodes. Its excellent conductivity and mechanical properties make it suitable for electrical contacts, current-carrying shafts, arms, and backup bars in welding and electrical equipment.

Standardization and composition

UNS	C18150
EN	CuCr1Zr (CW106C)
JIS	/
GB	C18150 (TCr1-0.15)
Cu	Balance%
Cr	0.5-1.5%
Zr	0.03-0.3%
Fe	≤ 0.08%
Si	≤ 0.1%
Others	≤ 0.2%

Physical properties①

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

Density (g/cm³)	8.9
Electrical conductivity (%IACS)	79
Thermal conductivity (W / m x K)	324
Coefficient of thermal expansion② (10-6/K)	16.5
Modulus of elasticity (GPa)	117

Fabrication Properties

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

Capacity for being cold worked	Good
Brazing	Good
Resistance welding	Not recommended
Forgeability rating ③	80%
Machinability rating④	20%

Mechanical Properties

Temper	Diameter(mm)	Tensile Strength(MPa min.)	Yield Strength(MPa min.)	Elongation(A% min.)
R470	4 ≤ Φ ≤ 30	470	420	8
R430	30 ≤ Φ ≤ 50	430	350	10
R370	50 ≤ Φ ≤ 100	370	250	16

Dimension Tolerance and Delivery Forms

Note⑤：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		Coil wire
Diameter (mm)	Tolerance⑤ (mm)	Ovality (mm max.)	Length (mm max.)	Straightness (mm/m max.)	ID(mm max.)	Weight(kg max.)
0.5 ≤ Φ ≤ 3	0.04	0.02	/	/	550	50
5 Φ ≤ 10	0.06	0.03	4000	1.0	800	500
10 Φ ≤ 20	0.10	0.05	4000	1.0	1200	500
20 Φ ≤ 25	0.16	0.08	4000	1.0
25 Φ ≤ 30	0.18	0.09	4000	1.0
30 Φ ≤ 40	0.20	0.10	4000	1.0
40 Φ ≤ 45	0.24	0.12	4000	1.0
45 Φ ≤ 50	0.30	0.15	4000	1.0
50 Φ ≤ 60	0.34	0.17	4000	1.0
60 Φ ≤ 80	0.44	0.22	2500	3.0
80 Φ ≤ 100	0.60	0.30	2000	3.0
100 Φ ≤ 120	1.00	0.50	1500	3.0
120 ≤ Φ ≤ 160	2.00	1.00	1000	5.0