Six ways to identify inferior ductile iron pipes

1. Ductile iron pipes are prone to folding. Folding is a variety of fold lines formed on the surface of ductile iron pipes, and this defect often runs through the longitudinal direction of the entire product.

2. The appearance of poor-quality ductile iron pipes often has pockmarks. Pockmarked surface is the defect of irregular bumps on the surface of ductile iron pipe caused by severe wear of the rolling groove. Because manufacturers of inferior ductile iron pipes want to pursue profits, the precision of rolling grooves often exceeds the standard.

3. The surface of inferior ductile iron pipes is prone to scarring.

4. Cracks are easy to occur on the surface of inferior materials. The reason is that its billet is adobe, and the adobe has many pores. During the cooling process, the adobe is subjected to thermal stress and cracks are formed. After rolling, there are cracks.

5. Inferior ductile iron pipes are easily scratched, because the poor-quality material manufacturers have poor equipment, which is prone to burrs and scratches on the surface of ductile iron pipes. Deep scratches reduce the strength of ductile iron pipes.

6. Inferior ductile iron pipes have no metallic luster and are light red or similar to pig iron.

If you don't know how to choose and buy in purchasing, use all these six points, and you will definitely not buy inferior ductile ink tubes.