How many types of brass can be divided?

Brass with zinc as the primary element of the copper alloy, with beautiful yellow, collectively referred to as brass. Copper zinc binary alloy is called general brass or simple brass. Brass with more than three yuan is called special brass or complex brass. Brass alloys with zinc content less than 36% are composed of solid solutions and have excellent cold working functions. For example, brass with zinc content of 30% is commonly used to make shell casings, commonly known as shell brass or seventy-three brass. Brass alloys with zinc content between 36 and 42% are composed of and solid solutions, among which the commonly used is hexagonal brass with zinc content of 40%. In order to improve the function of general brass, other elements are often added, such as aluminum, nickel, manganese, tin, silicon, lead, etc. Aluminum can improve the strength, hardness and corrosion resistance of brass, but reduce the plasticity of brass, suitable for Marine condensate pipes and other corrosion resistant parts. Tin can improve the strength of brass and corrosion resistance to seawater, so it is called Marine brass, used for ship thermal equipment and propeller. Lead can improve the cutting function of brass. This free cutting brass is often used as a wall clock part. Brass castings are often used to make valves and plumbing fittings.

Two-phase brass (from H63 to H59).5% of the scale, iron, and the general brass α and β phase is a brief Cu-Zn solid solution, the detailed temperature scale with different amount of Zn has changed, silicon, mechanical function is not the same, brass mechanical function with different amount of zinc and change the curve, iron. Lead brass, which is composed of (α+β) two phases by microarrangement at room temperature, is called (α+β) brass (two-phase brass); The microstructure of brass with zinc content exceeding 46% ~ 50% at room temperature consists of β phase only. The latter two kinds of alloy have (α+β) two-phase structure, and often a small amount of R phase, not high ductility at room temperature. Manganese brass has (α+β) arrangement, and hMN58-2 is commonly used. It has good pressure machining function under cold and hot states. Iron, brass. Therefore, a small amount of multiple strengthening is a way to improve the alloy function. Because of the harmful effect of lead, the high temperature plasticity of α lead brass is very low. Manganese: nickel and copper can form continuous solid solution, and the participation of trace cerium can effectively remove the middle temperature brittleness.