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The difference between aluminum bronze and tin bronze and the main points of semi-continuous casting

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Update time : 2023-02-09 09:50:38

Aluminum bronze is a copper-base alloy with aluminum as the main alloying element. Tin bronze is a copper-based alloy called tin bronze with tin as the main alloying element. Aluminum bronze has higher mechanical properties than tin bronze. The aluminum content of aluminum bronze in practical application is between 5% and 12%. The aluminum bronze with 5% to 7% aluminum has good plasticity and is suitable for cold working. Aluminum bronze can be strengthened by heat treatment, its strength is higher than tin bronze, high temperature oxidation resistance is also better. When the aluminum content is greater than 7%~8%, the strength increases, but the plasticity decreases sharply, so it is mostly used in the cast state or after hot working. Aluminum bronze has higher wear resistance and corrosion resistance in the atmosphere, seawater, seawater carbonic acid and most organic acids than tin bronze. Aluminum bronze can be manufactured gear, shaft sleeve, worm gear and other high strength wear resistance parts and high corrosion resistance elastic components.

Key points of semi-continuous casting of aluminum bronze

1. Aluminum bronze has casting properties such as strong inspiratory ability, easy oxidation and slag production, large solidification shrinkage, poor thermal conductivity, and poor casting performance;

2. Before casting, some alkali earth metal compounds, such as the mixture of Na3AlF6 and NaF, are used as slag cleaning agent to purify copper liquid, which is effective for the pure liquid metal and the improvement of the crystal structure of the ingot;

3. The casting temperature of aluminum bronze is generally 1120~1180℃, and the casting temperature of large size ingot is generally slightly lower. Aluminum bronze casting speed is low, for example, a factory produces 200mm ingot, casting speed is 4.0~4.5m/h; The production of 400mm ingot, casting speed is 2.4~2.6m/h;

4. When casting aluminum bronze round ingot, the metal liquid level in the mold can be cast without any protection, using the open flow mode;

5. The melt shall enter the crystallizer through the hole at the bottom of the funnel. The design of funnel aperture should meet two conditions at the same time: one is to ensure the flow rate matching the casting speed; Two to ensure that the funnel always maintain a certain height of the liquid level, so that the liquid surface of the scum can not flow into the mold from the funnel hole;

6. Aluminum bronze ingot is prone to porosity and concentrated shrinkage, which should be carefully repaired at the end of pouring to avoid the concentrated shrinkage of ingot.

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