Copper bar is a kind of non-ferrous metal processing bar, which has good processing performance and high conductivity. It is mainly divided into brass rod (copper zinc alloy, cheaper) and red copper rod (higher copper content).
Brass rod It is a bar shaped object made of copper and zinc alloy, named after its yellow color. Copper content 56%~68% And its melting point is 934~967 Degrees. Brass has good mechanical properties and wear resistance, and can be used to manufacture accurate instruments, ship parts, gun casings, etc. Different zinc content will have different colors, such as 18%-20% It will be red, and the zinc content is 20%-30% It will be brown. In addition, brass has a unique sound, so the eastern gongs, cymbals, bells, horns and other instruments, as well as the western ones Copper tube All musical instruments are made of brass.
classification
Materials include: H59 、 H59-1 、 H59-2 、 H59-3 、 H60 、 H60-2 、 H62 、 H63 、 H65 、 H68 、 H70 、 H80 、 H90 ； C1100 、 C1020 、 C2680 、 C2800 、 C2600 、 C2801 、 C5191 、 C5210 、 C2200 、 C7521 、 C7541 、 C17200 、 C1070 、 C7701 、 QSn6.5-0.1 、 QSn8-0.3 、 QSn4-0.3 、 BZn18-18 、 BZn15-20 、 CuBe2 And many other materials, welcome customers to order samples.
58-3 Copper bar, 59-1 Copper bars are free cutting brass , There are environmental protection brass bars and ordinary brass bars. General 58-3 Copper rod ,59-1 The copper bars are all extruded. The performance of copper bars produced by ordinary continuous casting copper bars cannot reach the standard. The copper bars produced by extrusion process have good tensile strength, high hardness and high straightness. Generally, there are more accurate copper parts used in automobile parts, health parts, electrical accessories, etc.
Scope of application
air conditioner Pipe Refrigerator Pipe, oil pipe, fuel supply Water pipe Road and various machinery supporting materials, automobile synchronizer gear ring, marine pump, valve, structural parts, friction accessories, etc [1]
three Principles of alloy manufacturing edit
（ one ）All elements, without exception, reduce the conductivity and thermal conductivity of the copper bar. When elements are dissolved in the copper bar, they cause lattice distortion of the copper bar, which causes wave scattering when free electrons flow in a directional direction, and increases the resistivity. On the contrary, elements with no or little solid solution in the copper bar have little impact on the conductivity and thermal conductivity of the copper bar, Special attention should be paid to the fact that the solid solubility of some elements in the copper bar decreases sharply with the decrease of temperature. The precipitation of simple substances and metal compounds can not only strengthen the copper bar alloy by solid solution and dispersion, but also reduce the conductivity slightly. This is an important alloying principle for the study of high conductivity alloys. Here, it should be noted that iron, silicon, copper The alloy composed of chromium four elements and copper bar is an important high conductivity alloy; Because the influence of alloy elements on the performance of copper bar is superposition CoCr — Zr This alloy is * * * high conductivity alloy.
（ two ）The preparation of copper base corrosion resistant alloy should be single-phase to avoid the electrochemical corrosion caused by the second phase in the alloy. For this reason, the added alloy elements should have great solid solubility in copper bars, even infinite mutual soluble elements. Single phase brass bars, bronze bars and white copper bars used in engineering have excellent corrosion resistance and are important heat exchange materials.
（ three ）There are both soft phase and hard phase in the preparation of copper based wear-resistant alloy, so it is necessary to ensure that the added elements are not only solidly dissolved in the copper bar, but also have hard phase precipitation. Typical hard phases in copper bar alloys are Ni3Si 、 FeALSi Compounds, etc, a Phase should not be greater than 10 % 。
（ four ）The solid copper bar alloy with polycrystalline transformation has damping properties, such as Cu one Mn The alloy with thermoelastic martensite transformation in solid state has memory properties, such as Cu one Zn one Al 、 Cu one Al one Mn
