TU1 OFC
     
     Name: TU1 oxygen-free copper belt
     Oxygen-free copper is copper deoxidizer also does not contain any residue. But in fact still contains a very small amount of oxygen, and some impurities. According to standard regulations, the oxygen content is not more than 0.03% total impurity content of not more than 0.05%, a purity of greater than 99.95% copper.
     According to the oxygen content and impurity content, divided into I and II OFC oxygen-free copper. The 1st 99.97% purity oxygen-free copper, the oxygen content of not more than 0.003%, and the total impurity content of not more than 0.03%; the 2nd to 99.95% purity oxygen-free copper, the oxygen content of not more than 0.003%, and the total content of impurities not more than 0.05%.
     OFC no hydrogen embrittlement, high conductivity, workability and weldability, corrosion resistance and low temperature performance are good.
     TU1 oxygen-free copper plate and strip are key materials by vacuum industry, due to the power vacuum devices such as high-power transmitting tubes, magnetrons, traveling wave tubes, vacuum capacitors, vacuum switches, etc., are needed at a high temperature of 920 ℃, the hydrogen atmosphere brazing, the copper in the case of hydrogen and oxygen occurs Cu 2 O + H 2 → Cu + H 2 O reaction, the resulting vapor will cause intergranular cracking of copper, thereby causing the vacuum product items leakage, and therefore the world are special provisions have OFC special varieties were strict rules for oxygen content, our zero number, the 1st, the 2nd OFC oxygen content were defined as 5ppm, 20ppm, 30ppm, while the general copper oxygen content is defined as 200ppm, American ASTM standard electric vacuum with oxygen-free copper provides two grades, the oxygen content was 5 ppm and 10 ppm, in addition, due to under high vacuum conditions (≤ 10 - 8 / t), elemental copper evaporate easily destroy a vacuum environment, it must be strictly controlled, especially Zn, P, Mn, As, Sb, Bi and other elements, to ensure that oxygen-free high conductivity, must be strictly control impurity content, oxygen-free copper in the copper content specified in the national standard number zero, the 1st, the 2nd oxygen-free copper content were defined as 99.99, 99.97, 99.95; conductivity oxygen-free copper products should reach 100% IACS .