Chinese name ZCuZn38Mn2Pb2 material name cast copper alloy
Standard GB/T 1176-1987 alias 38-2-2 manganese brass, metal type
overview:
ZCuZn38Mn2Pb2 cast copper alloy has high mechanical properties, corrosion resistance, wear resistance is better, and the machinability is good. ZCuZn38Mn2Pb2 cast copper alloy is used for general purpose structural parts, ships, instruments, etc. simple castings, such as sleeves, bushings, bearings, slides, etc.
Chemical composition
Copper Cu: 57.0~60.0
Tin Sn : ≤ 2.0 (excluding the sum of impurities)
Zinc Zn: The rest
Lead Pb: 1.5 to 2.5
Aluminum Al: ≤ 1.0 (excluding the sum of impurities)
Iron Fe: ≤0.8 (impurities)
Manganese Mn: 1.5~2.5
Beryllium Sb : ≤ 0.1 (impurity)
Note: The sum of impurities ≤ 2.0
Mechanical properties:
Tensile strength σb (MPa): ≥345
Elongation δ5 (%): ≥18
Hardness: ≥785HB
●Heat treatment specification: heating temperature 1050 ~ 1100 °C; pouring temperature 980 ~ 1000 °C.
CuZn39pb2 lead brass
Chinese CuZn39pb2 lead brass composition Cu 57. 5－59． 5 Pb2 etc
Impurity ingredient Fe≤0. 5 Ni special hardness, good strength
The main ingredient is Cu 57. 5－59． 5 Pb2, etc., for the production of hot mines and cutting machining.
Chemical composition and properties:
The main ingredient Cu 57. 5－59． 5 Pb2． 0－2． 8 Zn Allowance Impurity Component % Fe≤0. 5 Ni-- Total Impurities % ≤1. 2
Characteristics of hardness, good strength, lead particle distribution is uniform, long-term use without warping. Widely used lead brass: Properties: On the basis of copper-zinc alloy, lead brass is added. According to the zinc content, it can be divided into single-phase α lead brass, two-phase (α + β) lead brass. Single-phase α lead brass can only be cold-rolled and hot extruded, commonly used 63Cu-34Zn-3Pb alloy, soft tensile strength of 350MPa, elongation of 45%. It has high strength and good cold working performance, excellent cutting ability, and is mainly used for parts with high machinability on instruments and other mechanical instruments. Two-phase (α + β) lead brass can be hot rolled, hot extruded and cold working, the typical alloy is 59Cu-40Zn-1Pb, superplastic in the temperature range of 550 ~ 650 ° C, has high strength and excellent cutting performance, soft tensile strength of 420MPa, elongation of 45%, is the most economical, the most commonly used lead brass. Parts, screws, washers, bushings, nuts, bases, bearing retainers, etc. for hot mines and machining
Lead brass
Lead brass is an extremely important and most widely used complex brass, which has excellent cutting properties, wear resistance and high strength, lead brass has a lead content of less than 3%, and a small amount of Fe, Ni or Sn is often added. Ph exists in a free state in the tissue, splitting the matrix, giving lead brass good cutting and friction reduction. Mainly used in mechanical engineering in a variety of connectors, valves, stem bearings to maintain, of which hot forging valve blanks, lock industry, clock and watch industry is three important markets, lead brass cost is an important premise of its wide application, its alloy composition can contain a variety of alloying elements, and the content requirements are relatively loose, but also for the comprehensive utilization of copper alloy raw materials laid the foundation.
quality
Lead brass is a complex brass with lead as the main added element, which is made of Cu, Pb, Al, Zn 4 non-ferrous metals combined in a certain proportion. Lead is rarely soluble in copper-zinc alloys, exists in an independent phase in the alloy, and is distributed in the grain boundaries and crystals in a free particle, which has both lubricating effect and can make the chips into a crumbling state, which can improve the cutting and wear resistance of brass. Lead brass is directly proportional to lead content, but when the lead content exceeds 3%, it no longer significantly improves the machinability of copper and reduces the hardness, strength and elongation of brass. Therefore, the main properties of lead brass can be summarized as wear resistance, corrosion resistance and good toughness.
use
In the electronics industry, it is used for precision corrosion-resistant parts such as tape recorder movements, video recorders, cameras, clocks and watches and other electronic components