How to Choose the Quality of Ductile Iron Pipe?

As a Ductile Iron Pipe Suppliers, share with you. Ductile iron is a brittle material. First of all, cast iron means that the carbon content is greater than 2.1% (the carbon content of ductile iron is 3.50-3.90%, and the metallographic structure is: ferrite + pearlite), high carbon content, and hardness It must be high. Secondly, the spheroidization of the nodular ink means that the size of the metal particles becomes smaller, which will also increase the strength and hardness of the material. So in general, the hardness of ductile iron is very high (definitely higher than that of ordinary steel).

Ductile Iron Pipe

However, sometimes the impact toughness test is done on some ductile irons, and the fracture is studied. The fracture morphology reflects the dimple fracture, and it is explained that it is ductile cracking. In view of the research habits, we usually call ductile iron brittle materials. Ductile iron pipes have so much advantage in water supply pipes and have so wide application range. So how to distinguish the quality of ductile iron pipes?

To share with us today how to look at the quality of ductile iron pipes: ductile iron pipes are easy to fold. Folding is a variety of fold lines formed by the appearance of ductile iron pipes. This shortcoming generally runs through the longitudinal direction of the entire product. Ductile iron pipes often have the appearance of pitting. The pitted surface is due to the serious wear of the rolling groove, which results in the irregularity of the surface of the ductile iron pipe. Because manufacturers of ductile iron pipes seek to make a profit, groove rolling is often the most overrun.

Nodular cast iron pipes are prone to scars. Nodular cast iron pipes are prone to cracks on the surface, because the billet is adobe, and the adobe has many pores. The adobe cracks due to thermal stress during the cooling process. After rolling, there will be cracks. The ductile iron pipe is simply scratched. The reason is that the equipment of the material manufacturer is simple, prone to burrs and scratches on the surface of the ductile iron pipe. Deep scratches reduce the strength of ductile iron pipes.

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