h65 brass band lead content GB Environmental C2800 environmental brass plate with a lead content of cloud H65 Brass Copper Copper sales 150PPM C3604 lead content of lead-free brass rod brass rods can be achieved within 50PPMM -H62 brass rods brass -H65 Stick -C3604 -C3602 brass rod brass rods - brass rods -H62 unleaded brass rods -H65 ruled brass threaded rods -C3561 -HPB63-3 brass rod brass rod - environmental brass rods -H59 yellow copper - brass rods imported brass rods -HPB59-1 -C4640 brass rod brass rods -H65 -C3603 brass hexagonal rods - brass square brass rod brass -H62 - in the thick brass - H65 yellow copper - copper -H59 green yellow brass plate -CUZN10 brass - copper -C2680 import yellow brass plate brass plate -H90 -C2600 -H96 yellow brass yellow brass copper -H70 -H62 brass brass brass -C2680 -H65 Brass - Brass capillary -H68 brass -H59 Brass brass wire brass wire -H62 - semi-hard brass wire brass wire -H2600 -H65 -H68 brass wire brass wire brass wire -H59 - imported brass line - environmental brass wire Yunnan Copper Copper Industry (Shenzhen) Co., Ltd. brass band brass band -H68 -H62 yellow brass band -CUZN10 Copperbelt -C2680 brass band -H65 brass band - semi-hard brass band -C2200 brass band - super hard brass band - environmental brass band brass band -CUZN37 -C2700 -H90 brass band brass band - High precision brass band H65 brass band cuzn35 cuzn33 cuzn36 brass band brass band brass band cuzn33 cuzn40 cuzn35 brass brass brass cuzn36 cuzn37 cuzn40 brass brass brass brass row row -H62 -C2680 -H65 brass brass row row - row -H68 brass brass brass row -H59 row (1) Ordinary Brass Brass is an ordinary room temperature organization binary alloy of copper and zinc, zinc content varied range compared Great, so the room is also very different organization. According to CU-ZN binary state diagram, brass room three organizations: the amount of 35% zinc brass, the microstructure at room temperature by a single phase solid solution Α called Α brass; zinc amount in 36% to 46% of the brass, the microstructure at room temperature by (Α + Β) of two phases, called (Α + Β) brass (two-phase brass); zinc content of more than 46 % to 50% of the brass, the microstructure at room temperature only phase consists Β, called Β brass. (2) pressure processing performance Α single phase brass (from H96 to H65) with good ductility, can withstand hot and cold processing, but Α single phase brass prone to temperature brittle forging and other thermal processing, the specific temperature range ZN containing different amounts vary, typically between 200 ~ 700 ℃. Thus, thermal processing temperature should be higher than 700 ℃. The main single-phase Α brass brittle zone temperature causes at CU-ZN alloy system Α phase region exists CU3ZN and CU9ZN two ordered compounds, occurs when low-temperature heating and orderly transition of the alloy brittle; other alloy in the presence of trace amounts of lead, bismuth harmful impurities and copper forming low melting point eutectic films distributed in the grain boundary, resulting in intergranular fracture during thermal processing. Practice shows that adding small amounts of cerium can effectively eliminate temperature brittle. Two-phase brass (from H63 to H59), Alloy plasticity in addition to good Α phase, but also emerged from the electronic-based compound CUZN Β solid solution. Β phase with high plasticity at high temperatures and low temperatures Β 'phase (ordered solid solution) hard and brittle nature. Therefore (Α + Β) should be forged brass in the hot state. Zinc greater than 46% to 50% due to the performance of Β brass brittle and can not be pressure processing. ? 0? 2 is more of an alloy made of two or more constituent elements called special brass. The copper alloy of lead, tin, manganese, nickel, iron, silicon composition. Brass has strong wear resistance. Special brass special brass called it high strength, hardness, resistance to chemical corrosion. There machining mechanical properties are more prominent. The pull from the brass into a seamless copper tube, soft, strong wear resistance. Seamless brass heat exchangers and condensers can be used for low temperature piping, sea transport pipe. Manufacture of sheet, strip, bars, tubing, casting parts. 62% copper 68%, strong plastic, manufacturing pressure equipment. Brass classified according brass alloy elements contained in different types of brass is divided into ordinary brass and special brass two. Pressure called deformation processing of brass brass. Brass to zinc as the main element of the copper alloy, with a beautiful yellow, collectively referred to as brass. Cu-Zn binary alloy that ordinary brass, or a simple brass. More than triple brass said the complexity of special brass or brass. Less than 36% zinc brass alloy by solid solution, with good cold working properties, such as 30% zinc brass used to make shells, commonly known as cartridge brass or seventy-three brass. Zinc between 36 to 42% of the brass alloy by solid solution, of which the most commonly used is 40% zinc brass Tiananmen. To improve the performance of ordinary brass, and often add other elements such as aluminum, nickel, manganese, tin, silicon and lead. Brass aluminum can improve the strength, hardness and corrosion resistance, but the plastic lower condenser suitable for sea vessels, and other corrosion-resistant parts. Brass tin can improve the strength and corrosion resistance to seawater, it said the Navy brass, used thermal equipment and ship propellers and so on. Lead can improve the cutting performance of brass; this cutting brass is often used as watch parts. Brass castings used to produce valves and pipe fittings brass characteristics ① there is a very good plasticity (which is the best in brass) and high intensity, can be cutting performance, easy welding, corrosion is very stable in general, but easy to produce corrosion cracking. Ordinary brass in the most widely used species. ② strength than copper (brass, but in general, it is the lowest), electrical conductivity, thermal conductivity, has high corrosion resistance in the atmosphere and fresh water, and good plasticity, easy to cold and hot pressure processing easy welding, forging, and tin, no stress corrosion cracking tendencies