Casting production of A23 wear-resistant steel large dredging pump impeller
Recently, a large dredging job in the coastal city of Jiaozhou Bay required a 42" diameter high-pressure pump impeller made out of A23 steel. The impeller is a key component of the dredging system, which requires the development of specialized production methods to ensure its strength and accuracy.
The impeller starts from a forged A23 steel blank which is then machined into the required shape and profile. The process starts with pre-heating and vacuum quenching of the blank to reach the appropriate hardness and strength. The shape is then produced by milling and drilling while accuracy is maintained by careful inspection and measurement.
Once the shape is complete, it is subjected to double-tempered heat treatment in a sand-vacuum furnace. This process further increases the hardness and strength of A23 steel to help ensure its wear resistance. The impeller is then coated with polyurethane epoxy which is compatible with high pressure seawater and helps protect the surface.
The finished impeller is then moved to the assembly stage, where it must be fit into the larger pump body. To ensure precision and accuracy, the impeller and pump body components must be precision-fit together. This is accomplished by using a special fixture which allows for small amounts of adjustments to be made in order to achieve the exact fit that is needed for optimal performance.
The finished large dredging impeller was accepted with high satisfaction and met the strict requirements for wear-resistance and accuracy. The team of engineers and machinists have successfully demonstrated the accuracy and strength of A23 steel in a high pressure marine application. The seamless production and assembly process demonstrates the expertise and capabilities of the project team and their ability to work together to create a high quality product.
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