Copper Bar

Product features

A brass rod is a rod-shaped 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 excellent mechanical and wear resistance properties and can be used to manufacture precision instruments, ship parts, and gun casings.

The zinc content varies, and there will also be different colors. For example, a zinc content of 18% -20% will turn red yellow, while a zinc content of 20% -30% will turn brown yellow. In addition, brass has a unique sound when struck, so Eastern instruments such as gongs, cymbals, bells, and horns, as well as Western brass instruments, are all made of brass.

Principles of Alloy Manufacturing

(1) All elements without exception reduce the conductivity and thermal conductivity of copper bars. Any element that solidly dissolves in the copper bar causes lattice distortion, resulting in wave scattering when free electrons flow in a directional manner, increasing the electrical resistivity. On the contrary, elements with no or little solid solubility in the copper bar have little effect on the conductivity and thermal conductivity of the copper bar. It should be noted that some elements in the copper bar have a drastic decrease in solid solubility as the temperature decreases, and precipitate as elemental and metallic compounds. This can not only strengthen the copper bar alloy through solid solution and dispersion, but also has little effect on the conductivity reduction. This is an important alloying principle for the study of high-strength and high conductivity alloys. It should be particularly pointed out that iron, silicon, The alloy composed of zirconium (not wrong), chromium and copper rod is an extremely important high-strength and high conductivity alloy; Due to the superimposed effects of alloying elements on the performance of copper bars, CoCr Zr series alloys are well-known high-strength and high conductivity alloys.

(2) The microstructure of copper based corrosion-resistant alloys should be single-phase to avoid electrochemical corrosion caused by the presence of a second phase in the alloy. The alloy elements added for this purpose should have a high solid solubility in copper rods, even infinitely miscible elements. In engineering applications, single-phase brass rods, bronze rods, and white copper rods all have excellent corrosion resistance and are important heat exchange materials.

(3) Both soft and hard phases exist in the microstructure of copper based wear-resistant alloys. Therefore, during alloying, it is necessary to ensure that the added elements not only dissolve in the copper rod, but also precipitate hard phases. Typical hard phases in copper rod alloys include Ni3Si FeALSi compounds, etc, Phase A should not exceed 10%.

(4) Copper bar alloys with polycrystalline transformation in solid state have damping properties, such as Cu Mn series alloys, and alloys with thermoelastic martensitic transformation in solid state have memory properties, such as Cu Zn Al Cu Al Mn alloy series.

(5) The color of copper bars can be changed by adding alloying elements, such as zinc, aluminum, tin, nickel, etc. As the content changes, the color also changes from red to blue, yellow to white. Reasonably controlling the content will obtain imitation gold materials and imitation silver alloys.

(6) The elements selected for the alloying of copper bars and alloys should be commonly used, inexpensive, and pollution-free. The added elements should follow the principle of multiple elements and small amounts. The alloy raw materials can be comprehensively utilized, and the alloy should have excellent process performance, suitable for processing into various finished and semi-finished products.