Beryllium bronze is a very versatile precipitation hardening alloy. After solid solution and aging treatment, the strength can reach 1250-1500MPa (1250-1500kg). Its heat treatment characteristics are: it has good plasticity after solid solution treatment and can be deformed by cold working. However, after aging treatment, it has an excellent elastic limit, and its hardness and strength are also improved.
(1) Solid solution treatment of beryllium bronze
Generally, the heating temperature for solution treatment is between 780-820℃. For materials used as elastic components, 760-780℃ is used, mainly to prevent coarse grains from affecting the strength. The temperature uniformity of the solution treatment furnace should be strictly controlled within ±5°C. The holding time can generally be calculated as 1 hour/25mm. When beryllium bronze is subjected to solid solution heating treatment in air or oxidizing atmosphere, an oxide film will be formed on the surface. Although it has little effect on the mechanical properties after age strengthening, it will affect the service life of the tool mold during cold working. To avoid oxidation, it should be heated in a vacuum furnace or ammonia decomposition, inert gas, reducing atmosphere (such as hydrogen, carbon monoxide, etc.) to obtain a bright heat treatment effect. In addition, attention should be paid to shortening the transfer time (during quenching) as much as possible, otherwise the mechanical properties after aging will be affected. Thin materials shall not exceed 3 seconds, and general parts shall not exceed 5 seconds. The quenching medium generally uses water (no heating required). Of course, oil can also be used for parts with complex shapes to avoid deformation.
(2) Aging treatment of beryllium bronze
The aging temperature of beryllium bronze is related to the Be content. All alloys containing less than 2.1% Be should be aged. For alloys with Be greater than 1.7%, the optimal aging temperature is 300-330°C, and the holding time is 1-3 hours (depending on the shape and thickness of the part). For highly conductive electrode alloys with Be less than 0.5%, due to the increased melting point, the optimal aging temperature is 450-480°C and the holding time is 1-3 hours. In recent years, double-stage and multi-stage aging have also been developed, that is, short-term aging at high temperature and then long-term insulation aging at low temperature. The advantage of this is that the performance is improved but the deformation is reduced. In order to improve the dimensional accuracy of beryllium bronze after aging, fixtures can be used for aging, and sometimes two separate stages of aging treatment can be used.
(3) Stress relief treatment of beryllium bronze
The stress relief annealing temperature of beryllium bronze is 150-200℃ and the holding time is 1-1.5 hours. It can be used to eliminate residual stress caused by metal cutting, straightening, cold forming, etc., and stabilize the shape and dimensional accuracy of parts during long-term use.
Commonly used beryllium bronze/beryllium copper grades
| Chinese standard | QBe2, QBe1.9, QBe1.9-0.1, QBe1.7, QBe0.6-2.5, QBe0.4-1.8, QBe0.3-1.5. |
| European standard | CuBe1.7 (CW100C), CuBe2 (CW101C), CuBe2Pb (CW102C), CuCo1Ni1Be (CW103C), CuCo2Be (CW104C) |
| American standard | beryllium copper C17000, C17200, C17300, beryllium cobalt copper C17500, beryllium nickel copper C17510. |
| Japanese standard | C1700, C1720, C1751. |
Jindalai Steel Group has the ability to provide timely delivery and on-demand rolling and cutting processing to ensure that it can provide users with qualified metal products accurately and quickly. The company stocks a large amount of copper alloy materials such as copper, oxygen-free copper, beryllium copper, brass, bronze, white copper, chromium zirconium copper, tungsten copper, etc. all year round. The products supplied include copper rods, copper plates, copper tubes, copper strips, copper wires, copper Wire, copper row, copper bar, copper block, hexagonal rod, square tube, round cake, etc., and various non-standard materials can be customized.
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Post time: Mar-23-2024