T1, T2 and T3 are three grades of red copper. What are the differences between these three grades of red copper, mainly in the following aspects:

1. Different copper content

The content of T1 pure copper is the highest and purest. The chemical composition of T1: Copper + silver CuAg: ≥ 99.95.

T2 copper refers to copper silver alloy, in which the copper + silver content of copper is more than 99.9%, that is, silver + copper + silver cuaq: 2999, and there is no requirement for phosphorus.

The content of T3 copper is Cu + Ag CuAg; ≥99.70。

2. Different intensities

Mechanical properties and tensile strength of T1 pure copper: ob (MPA) ≥ 295 elongation after fracture: 45% ~ 50% HBS: 35 ~ 40.

T2 copper tensile strength AB (MPA) > 195, back extension length: 45% ~ 50% HBS: 35 ~ 40

Tensile strength of T3 copper AB (mpal: > 210. Elongation after fracture: 45% ~ 50% HBS: 35 ~ 40. Tensile strength of T4 copper is lower

3. Different conductivity

T1 pure copper has good conductivity, thermal conductivity, corrosion resistance and processing performance, and can be used for light welding and fiber welding. It contains less impurities that reduce conductivity and thermal conductivity, and a small amount of oxygen has little effect on conductivity, thermal conductivity and processing.

T2 copper has good electrical and thermal conductivity, corrosion resistance and processing properties, and can be welded and brazed. It contains less impurities that reduce conductivity and thermal conductivity, and a small amount of oxygen has little effect on conductivity, thermal conductivity and processing, but it is easy to cause "hydrogen disease".

T3 copper has lower conductivity, more thermal conductivity impurities, and higher gas content than T2, which is more likely to cause "gas disease" and cannot be processed (annealed, welded, etc.) and used in high-temperature reducing atmosphere.

4. Different resistance

T2 has low resistivity, high copper content, relatively pure, high conductivity and high T3 resistivity.

T3 ordinary pure copper, ordinary pure copper for high conductivity is oxygen-containing copper with a mass fraction of copper not less than 99.7% and a small amount of impurities, which is commonly used in industry. The appearance is purplish red, so it is also called red copper. Its recrystallization temperature is 200-280 ℃.

T3 oxygen free copper has no hydrogen embrittlement, high conductivity, good processability, welding performance, corrosion resistance and low temperature performance. The standards for oxygen content in different countries are also different, and there are some differences. OFC (oxygen free copper): metallic copper with a purity of 99.995%. It is generally used in electrical and electronic applications such as audio equipment, vacuum electronic devices and cables.

Among them, there are lc-ofc (linear crystalline oxygen free copper or crystalline oxygen free copper): purity above 99.995% and OCC (single crystal oxygen free copper): purity above 99.996%, which are also divided into pc-occ and up-occ. The single crystal oxygen-free copper produced by up-occ Technology (ultra pure copper by Ohno Continuous Casting Process) has no directionality, high purity, corrosion resistance and extremely low electrical impedance, which makes the wire suitable for high-speed and excellent transmission signals.

T3 chemical composition:

Copper + silver CuAg: ≥ 99.70

Lead Pb: ≤ 0.01

Bismuth Bi: ≤ 0.002

Note: ≤ 0.3 (impurity)

T3 is easy to produce hydrogen embrittlement in the reduction medium containing hydrogen, commonly known as hydrogen disease, so it is not suitable to process and use it in the reduction medium with high temperature above 370 ℃: its strength will be improved when it is lower than - 250 ℃.

T3 is fire refined copper, which contains a lot of metals and magazines. It has good electrical conductivity, thermal conductivity, corrosion resistance and processing performance, and can be welded and brazed. T3 is mainly used for the use of structural materials, such as the production of electrical lighting, gaskets, rivets, nozzles, and various conduits, and is also used for less important conductive components.

Red copper is not necessarily pure copper, sometimes a small amount of degassing elements or other elements are added to improve the material and performance, so it is also classified as copper alloy. Chinese red copper processing materials can be divided into four categories according to composition: ordinary red copper (T1, T2, T3), oxygen free copper (TU1, TU2 and high-purity, vacuum oxygen free copper), deoxidized copper (TUP, tumn) and special copper (arsenic copper, tellurium copper, silver copper) with a small amount of alloying elements.

Source: Internet

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