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Composition selection and body shrinkage of copper aluminium alloy water pump castings
- Oct 26, 2018 -

The body shrinkage of the copper aluminium alloy water pump castings, the cast iron and the high silicon carbon produced by the conventional process have lower carbon content than the cast iron, but the carbon equivalent is slightly higher, so there is no significant difference in the body shrinkage of the cast iron. This feature has also been verified in production. Section sensitivity. High silicon carbon is less sensitive than cast iron sections, a property that is important for submersible pump castings that are often subjected to impact forces.

The composition selection of copper aluminium alloy water pump castings generally means that the water-thickness of the water pump casting with small wall thickness is not easy to form ferrite, that is, it is easy to produce white mouth. Increasing the silicon to carbon ratio can effectively prevent the formation of a port at the thin wall, which is beneficial to improve the uniformity, strength and hardness of the casting structure and reduce the residual stress. However, when the carbon equivalent is high, the chance of occurrence of ferrite in the cast iron structure is significantly increased, which is extremely disadvantageous for improving the overall performance of the casting. According to the production test, we determined that: Wc = 3.1% to 3.3%, wherein the control carbon content is the core. When the carbon equivalent is high, the manganese content can be appropriately increased, and the requirement of UHT200 can be stabilized in this range.

Copper-aluminum alloy water pump castings mainly use locally produced coke and pig iron, which can be added to some extent.

5% to 15% scrap. The thickness of scrap steel is ≥3mm, and the blockiness is greater than 1/5 of the diameter of the furnace. It is required to be rust-removed. The rest of the furnace block is not more than 1/3 of the diameter of the furnace. In order to reduce the burning loss of silicon, iron alloy with lower silicon content is selected as much as possible. In order to ensure the melting temperature, coke with a higher fixed carbon should be used, and the blockiness should be between 90 and 130 mm.

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