How to identify inferior ductile iron pipes

Six tips to identify inferior ductile iron pipes

1. Ductile iron pipes are prone to folding. Folds are various fold lines formed on the surface of ductile iron pipes. This defect often runs throughout the longitudinal direction of the product.

2. Inferior ductile iron pipes often have pitted surfaces on the surface. The pitted surface is an irregular uneven defect on the surface of the ductile iron pipe caused by severe wear of the rolling groove. As manufacturers of low-quality ductile iron pipes pursue profits, groove rolling often exceeds the standard.

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

4. The surface of inferior materials is prone to cracks because its raw material is adobe, which has many pores. The adobe is subject to thermal stress during the cooling process, causing cracks, and cracks appear after rolling.

5. Inferior quality ductile iron pipes are easily scratched. The reason is that the equipment of inferior material manufacturers is simple and easy to produce burrs, which can scratch the surface of ductile iron pipes. Deep scratching reduces the strength of ductile iron pipe.

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

If you don’t know how to choose when purchasing, use these six points and you will definitely not buy inferior ductile graphite tubes.