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Copper alloys: temperatures for heat treatment of copper and copper alloys


Release time:

2021-09-05

Copper alloy: Classification of copper and copper alloy: 1. Pure copper: Pure copper is purplish red, also known as red copper. Its conductivity is second only to gold and silver, ranking third. It has good plasticity and toughness even at very low temperatures. It has a melting point of 1083, a density of 8.89-8.95 g/cm, a resistivity of 1.67-1.6810cm(20, a thermal conductivity of 391w/)MK, and a linear expansion coefficient of 17.010/. It has good stability in fresh water and seawater, the symbol t in the industrial bronze.

Copper alloys: temperatures for heat treatment of copper and copper alloys

Copper alloy: copper and copper alloy heat treatment overview

classification of copper and copper alloy:

1. Pure copper: Pure copper is purplish red, also known as red copper. Its conductivity is second only to gold and silver, ranking third. It has good plasticity and toughness even at very low temperatures. It has a melting point of 1083, a density of 8.89-8.95 g/cm, a resistivity of 1.67-1.6810cm(20, a thermal conductivity of 391w/)MK, and a linear expansion coefficient of 17.010/. It has good stability in fresh water and seawater, the symbol t in the industrial bronze.

2. Copper alloy: Copper alloy is divided into deformed copper alloy and cast copper alloy according to the process, and is divided into brass, bronze and cupronickel according to the chemical composition. Is it true among the varieties of copper alloy? Is it true that the symbol h, the symbol q of bronze and the symbol B of cupronickel use zinc as the main alloy? With tin, aluminum, beryllium, silicon, chromium as the main alloy is bronze, nickel as the main alloy is cupronickel, all kinds of copper alloys are also classified in more detail according to the main added elements, so there are many varieties of copper and copper alloys, which will be described in detail later.

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Overview of Heat Treatment of Copper and Copper Alloys

The heat treatment method commonly used in pure copper is recrystallization annealing. The heat treatment methods commonly used in copper alloys include homogenization annealing, stress relief annealing, recrystallization annealing, solid solution and aging treatment. The main purpose of homogenization annealing is to homogenize the chemical composition of ingots and castings, mainly in metallurgical plants and foundries.

1. The main purpose of strain relief annealing is to eliminate the residual internal stress generated during deformation processing, welding and casting, stabilize the size and performance of cold deformation or welded parts, and prevent workpiece deformation during cutting processing. Cold deformed brass, aluminum bronze and silicon bronze have a strong tendency to stress corrosion cracking, and stress relief annealing must be carried out. The strain relief annealing temperature of copper alloy is 30-100 lower than that of crystallization annealing, about 230-300, the temperature of copper alloy with complex composition is slightly higher, generally 300-350, and the holding time is 30-60 minutes.

Stress relief annealing has a significant effect on the strength and hardness of copper alloys. However, when stress relief annealing is required for large copper alloys, annealing hardening occurs, especially for aluminum bronze with Zn content exceeding 10%, Al content exceeding 4%, and yellow bronze with Mn content exceeding 5%, which is related to the aggregation of regular solid solution or solute atoms around dislocations.

2. Recrystallization annealing includes annealing between price processes and annealing of products. The purpose is to eliminate work hardening, restore plasticity, and obtain fine grain structure. Is it true? The grain size has a great influence on its processing performance. The fine grain structure has high strength and good processing surface quality, but it will change.

The resistance is large, the forming is difficult, and the coarse grain structure is easy to process, but the surface quality is poor and the fatigue performance is poor. Therefore, the grain size of the yellow bronze used for stamping must be controlled according to the needs.

3. Bright annealed copper and copper alloys are easy to oxidize during processing. In order to prevent oxidation, the surface quality of the workpiece should be improved. Anneal in atmosphere or vacuum furnace, that is, bright annealing. The usual protective gases include water vapor, ammonia decomposition gas, hydrogen dried with nitrogen, and strengthening effect can be obtained through subsequent aging treatment. Some alloys such as beryllium bronze and silicon bronze can improve plasticity through solid solution treatment and are easy to cold deformation processing, the martensite microstructure can be obtained after complex solution treatment of aluminum bronze.

Copper alloy solid solution treatment must strictly control the furnace temperature, the temperature is too high will lead to the alloy grain coarse, serious oxidation, burning too brittle, the temperature is too low, the solid solution is not sufficient, after the impact of aging strengthening, furnace temperature control within 5, after heating generally use water cooling.

Copper alloy aging generally adopts artificial aging or direct artificial aging after thermal processing. After aging, in order to eliminate the internal stress caused by some reason, re-aging (slightly lower than the previous paragraph) is required, and the accuracy of temperature control also needs to be higher. Generally, it does not exceed the range of 3.

Heat treatment of industrial pure copper

The heat treatment of industrial pure copper is mainly recrystallization annealing, which aims to change the grain size, eliminate internal stress and soften metal. The annealing temperature is 500-700. In order to prevent hydrogen syndrome, the workpiece must be cleaned. In the case of oxygen-containing copper, especially pure copper with oxygen content exceeding 2% by mass, annealing needs to be carried out in a weak reducing atmosphere, preferably in a vacuum furnace, or the annealing temperature is limited to below 500, after annealing, the workpiece quickly overcomes water cooling and reduces oxidation.

The main products of Nantong Moore New Material Technology Co., Ltd. are GIL connector, beryllium cobalt copper, watchband contact finger, spring contact finger, special-shaped plum contact finger, composite watchband contact finger, charging pile current connector, chrome zirconium copper, copper alloy, copper alloy spring, etc. Nantong Moore New Material Technology Co., Ltd. is developed from its predecessor Nantong Moore Electric Co., Ltd., which is an enterprise specializing in the design, development and research of high-strength and high-conductivity alloy materials and electrical connection products. Companies in the industry has achieved a high degree of recognition and reputation of the majority of customers. The company in line with professional advanced, pioneering spirit, set up rigorous and pragmatic, the basic concept. To do a product, cast a boutique for the purpose of the enterprise, and give full play to the characteristics of flexible and diverse enterprises, intentions to serve every customer.

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