The Manufacturing Process Of Ductile Iron Pipe

Visitors to the DINSEN ductile iron facility are often curious about how ductile iron pipes are manufactured. The raw materials for ductile iron pipes are primarily high-purity molten iron or pig iron, requiring low phosphorus and low sulfur content to ensure the basic quality of the pipe material. During the manufacturing process, spheroidizing agents (such as magnesium alloys) must be added to make the graphite spherical, which is crucial for the high strength of ductile iron pipes.

Simultaneously, inoculants are added to promote graphitization and ensure uniform mechanical properties of the ductile iron pipe. To adjust the composition or reduce costs, scrap steel, recycled materials, and carburizing agents can also be added. Through the combination of these raw materials, ductile iron pipes ultimately possess both the essence of iron and the performance of steel.

The Manufacturing Process Of Ductile Iron Pipe

1. Intermediate frequency furnace Molten Iron Refining

All raw materials are tested in all aspects
Monitoring the chemical composition of molten iron in each set
Monitoring the temperature of molten iron in each set before outlet
Monitoring data are all networked and shared online

2. Spheroidizing Treatment

Monitoring the chemical composition of each ladle
Measure the temperature of each ladle of molten iron before casting

3. Centrifugation Casting

The highest production efficiency in the world
The pioneered automatic pipe extracting technology in China

4. Heat Treatment

Intelligent temperature control
Monitoring metallograhic structure and mechanical properties

5. Zinc Spraying

Strict control of zinc spraying amount
The pioneered anti-corrosion of zinc-aluminum alloy in China

6. Internal Cement Lining

Adopt blast furnace slag cement, which is the pioneered BFSC China
Monitoring the quality of raw materials, appearance of internal lining, wall thickness and performance