The brass rod is a rod-like object made of an alloy of copper and zinc, named after its yellow color. Brass with a copper content of 56% to 68% has a melting point of 934 to 967 degrees. Brass has good mechanical properties and wear resistance, and can be used to manufacture precision instruments, parts of ships, and shells of guns.
Different zinc content will also have different colors. For example, if the zinc content is 18%-20%, it will be red-yellow, and if the zinc content is 20%-30%, it will be brown-yellow. In addition, the sound of brass is unique, so Eastern gongs, cymbals, bells, horns and other musical instruments, as well as Western brass instruments, are all made of brass.
Classification
Materials are: 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
58-3 copper rod, 59-1 copper rod is free-cutting brass, divided into environmental protection brass rod and ordinary brass rod. Generally, the authentic 58-3 copper rods and 59-1 copper rods are extruded. The copper rods produced by ordinary continuous casting copper rods cannot reach all aspects. The copper rods of the extrusion process have good tensile properties. High hardness and high straightness. Generally, there is a relatively large amount of precision copper parts such as auto parts, medical accessories, and electrical accessories.
Scope of application
Air-conditioning pipes, refrigerator pipes, oil pipes, water supply pipes and various mechanical supporting materials, automobile synchronizer gear rings, marine pumps, valves, structural parts, friction accessories, etc.
(1) All elements reduce the electrical conductivity and thermal conductivity of the copper rod without exception. All elements are dissolved in the copper rod, causing the lattice distortion of the copper rod, causing the free electrons to flow in the direction of wave scattering and resistance. On the contrary, there is no solid solubility or few solid solution elements in the copper rod, which has little effect on the electrical and thermal conductivity of the copper rod. It should be particularly noted that the solid solubility of some elements in the copper rod decreases with the temperature. It is drastically reduced and precipitated with elemental substances and metal compounds, which can not only solid solution and dispersion strengthen the copper rod alloy, but also has little reduction in electrical conductivity. This is an important alloying principle for the study of high-strength and high-conductivity alloys. It should be specially It is pointed out that the alloy composed of the four elements of iron, silicon, zirconium (not wrong), chromium and copper rods is an extremely important high-strength and high-conductivity alloy; because the alloying elements have superimposed effects on the performance of copper rods, the CoCr-Zr series alloy is The famous high-strength and high-conductivity alloy.
(2) The structure of the copper-based corrosion-resistant alloy should be single-phase to avoid the appearance of the second phase in the alloy to cause electrochemical corrosion. For this reason, the alloy elements added should have a large solid solubility in the copper rod, and even infinitely mutually soluble elements. The single-phase brass rod, bronze rod, and cupronickel rod used in engineering have excellent corrosion resistance. , Is an important heat exchange material.
(3) There are both soft and hard phases in the structure of copper-based wear-resistant alloys. Therefore, during alloying, it must be ensured that the added elements are not only dissolved in the copper rods, but also hard phases are precipitated. In the copper rod alloys Typical hard phases include Ni3Si, FeALSi compounds, etc., and phase a should not exceed 10%.
(4) Copper rod alloys with polycrystalline transformation in solid state have damping properties, such as Cu-Mn series alloys, and alloys with thermoelastic martensite transformation in solid state have memory properties, such as Cu-Zn-Al, Cu-Al-Al Mn series alloy.
(5) The color of the copper rod can be changed by adding alloy elements, such as zinc, aluminum, tin, nickel and other elements. With the content change, the color also changes from red to green to yellow to white, which is reasonable To control the content will obtain imitation gold materials and imitation silver alloys.
(6) The elements selected for the alloying of copper rods and alloys should be commonly used, inexpensive and pollution-free. The added elements should be based on the principle of multiple and small quantities. The alloy raw materials can be used comprehensively. The alloy should have excellent process performance and suitable For processing into various finished and semi-finished products.
