It is widely believed that when a part requires a special shape or irregular surface for greater efficiency, or needs to have internal channels and cavities, it is best to cast it as a single, integrated piece. From a quality standpoint, creating a single, whole part is a good preventive measure against assembly errors or the possibility of not including all parts during shipment. In any complex cutting, forming, or assembly operations, the likelihood of misfitting parts is always present, and it increases with the number of anti-corrosion spiral steel pipes. On the other hand, once the size of a single anti-corrosion spiral steel pipe is correctly determined, it can be reproduced completely by conventional methods.

Integrating the principles of castings design with the regular mechanical property testing of test bars cast from molten iron ensures high reproducibility and reliability of the castings. This level of reliability cannot be achieved with other production methods. For instance, welding involves a greater likelihood of hidden defects such as cracks and incomplete fusion due to manual labor.

If casting defects occur in cast iron, they typically appear as shrinkage or gas pores, rather than cracks or seams. The increased stress caused by these defects is less severe than that from cracks. Moreover, they are usually identifiable during surface inspections or rough machining. Defective castings are often detected and discarded before they are assembled into finished products.