bedra10200

Oxygen-Free Copper

It is produced from selected refined cathodes by direct conversion under carefully controlled conditions to prevent contamination by oxygen and other impurities. This alloy exhibits exceptionally high electrical and thermal conductivity, as well as good corrosion resistance and solderability. Due to its extremely low oxygen content, it is suitable for gas welding or high-temperature brazing without embrittlement or blistering when heated in a reducing atmosphere.

Typical applications:

It is mainly used in the electrical industry, including busbars in electrical power installations; rotor bars in induction motors; EV connectors, contacts, and relays; vacuum tubes and solid-state devices; as well as glass or ceramic to metal seals.

Standardization and composition

UNS	C10200
EN	Cu-OF (CW008A)
JIS	C1020
GB	T10180 (TU2)
Cu+Ag	≥99.95 %
Pb	≤ 0.005 %
Bi	≤ 0.0005 %
O	≤ 0.001 %
Others	≤ 0.03 %

Physical properties①

Density (g/cm³)	8.94
Melting point (℃)	1083
Electrical conductivity (%IACS)	≥ 98.3
Thermal conductivity (W/m·K)	391.4
Coefficient of thermal expansion② (10-6/K)	16.97
Modulus of elasticity (GPa)	117.2

Note①：The testing temperature is 20℃.

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

Fabrication Properties

Cold workability	Excellent
Hot workability	Excellent
Brazing	Excellent
Machinability rating③	20%

Note③：C36000 = 100%

Mechanical Properties of Rods

Temper	Diameter(mm)	Tensile Strength(MPa min.)	Yield Strength(MPa min.)	Elongation(A% min.)	Hardness(HRF min.)
H04	Φ ≤ 10	310	/	12	/
H04	10 ＜ Φ ≤ 25	275	/	12	80
H04	25 ＜ Φ ≤ 50	240	/	15	75
H04	50 ＜ Φ ≤ 75	230	/	15	65
H04	Φ ＞ 75	205	/	15	/
O60	All sizes	195	/	25	50 max.

Mechanical Properties of Rars

Temper	Thickness (a) mm	Width (b) mm	Tensile Strength MPa min.	Yield Strength MPa min.	Elongation A% min.
H02	3.0 ≤ a ≤ 10	5.0 ≤ b ≤ 110	260	/	10
H02	All other sizes	All other sizes	230	/	15
O60	All sizes	All sizes	195	/	25

Dimension Tolerance for Rods and Wires

Diameter(mm)	Tolerance ④(mm)	Ovality(mm max.)	Length(mm max.)	Straightness(mm/m max)	ID(mm)	Weight(kg)
3.0 ≤ Φ ＜ 6.0	0.04	0.02	2500	0.5	650	50
6.0 ≤ Φ ＜ 10	0.06	0.03	3600	0.5	1200	500
10 ≤ Φ ＜ 18	0.06	0.03	3600	0.5	1200	500
18 ≤ Φ ＜ 30	0.15	0.075	4000	1.0	/	/
30 ≤ Φ ＜ 50	0.18	0.09	4000	1.0	/	/
50 ≤ Φ ＜ 60	0.2	0.10	4000	1.0	/	/
60 ≤ Φ ≤ 80	0.3	0.15	4000	1.5	/	/

Note④：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.

Dimension Tolerance for Bars ⑤

Nominal width (mm)		Tolerance on width	Tolerance on nominal thickness for range of thickness (mm)
over	Up to and including		over 3 to 13 inclusive	over 13 to 25 inclusive	over 25 to 50 inclusive
5 ⑥	50	0.40	0.16	0.20	0.22
50	100	0.60	0.20	0.22	0.26
100	200	0.6 ⑦	0.22	0.26	0.30
200	300	0.6 ⑦	0.28	0.30	…

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.

Note⑥: Including 5.

Note⑦: Percent of specified width expressed to the nearest 0.01 mm.