Copper Flat Bar

Copper flat bars are made of high-purity electrolytic copper (purity ≥99.9%) as the base material. Common grades include T2 (oxygen content ≤0.003%), TU1 (oxygen-free copper) and American Standard C11000 (electrolytic tough copper). They are made into rectangular cross-section profiles through hot rolling or cold rolling processes. Its electrical conductivity is above 97% IACS, far exceeding that of ordinary metals, making it an ideal material for power transmission and electronic components. In terms of physical properties, the tensile strength is 200-250MPa, and the elongation is ≥30%. It can withstand cold bending, stamping and other processing without brittle cracking. Surface treatment usually uses mechanical polishing, tinning (thickness 5-10μm) or anti-oxidation coating to prevent oxidation discoloration and enhance weldability. The specifications range from 6-200mm in width, 2-50mm in thickness, and 2-10m in length. They are often used to make busbars for power distribution cabinets (with a current carrying capacity of several thousand amperes), transformer winding terminals, automotive motor conductive parts, and heat sinks that require high thermal conductivity (thermal conductivity ≥380W/m・K). In the high-end field, oxygen-free copper flat bars (such as C10200) are used in vacuum electronic devices and aerospace cable components due to their extremely low oxygen content (≤0.001%).