Shandong Xinyuantai Pipe Industry Co., Ltd. outlines the first stage of the ductile iron pipe production process. The ductile cast iron is melted in a medium-frequency induction furnace, and the temperature does not need to be excessively high—reaching approximately 1480°C. Once melted, the molten iron is left to settle for a certain period to ensure stability. Depending on the size of the casting, pouring temperatures typically range between 1380°C and 1410°C.
The second step involves the furnace lining, which can be either acidic or basic. The lining ratio, tamping, drying, and sintering are all carried out following standard procedures to ensure durability and performance.
In the third step, the charging process follows a conventional sequence. Initially, refractory iron alloys such as gray pig iron and molybdenum iron are placed at the bottom of the furnace. Then, scrap steel is added based on the principle of "loose on the bottom," which helps with better collapse and melting efficiency.
The fourth step focuses on the melting of high-chromium cast iron, which requires a higher melting temperature compared to regular cast iron—around 1200°C. The tapping temperature is generally around 1500°C, and the smelting is done using a medium-frequency induction furnace.
After all the metal charge has been fully melted and the temperature reaches 1480°C, deoxidation is performed by adding ferromanganese, ferrosilicon, and aluminum. This step is crucial to remove excess oxygen and improve the quality of the final product.
The fifth stage involves transferring and melting the electric power. The furnace operates at maximum power during this phase. Due to the significant chromium loss (approximately 5% to 15%), ferrochromium is usually added toward the end of the process, typically after the scrap has completely melted and the material is in a molten state.
This detailed process ensures that the ductile iron pipes produced meet high-quality standards and are suitable for various industrial applications. Shandong Xinyuantai Pipe Industry Co., Ltd. continues to refine and optimize its manufacturing techniques to maintain its position as a leading producer in the industry.
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