Comparison of ductile iron and pig iron and how to avoid graphite floating

- Feb 28, 2019 -

Ductile iron, which is a kind of material, is a common and commonly used material, and is widely used in some industries and fields. Therefore, it is necessary to familiarize and understand, because it can be known which occasions or circumstances can be used. This kind of material and get the desired finished product, through the correct use to achieve the purpose of use.


1. What is a ductile iron pipe? Is it different from the mechanism cast iron pipe?

A ductile iron pipe, which is a pipe made of spheroidal graphite cast iron, is called a ductile iron pipe, and is made of ductile iron. Comparing this kind of pipe with the mechanism cast iron pipe, we can conclude that there is a big difference between them. Specifically, it is:


Difference 1: In the production process, the ductile iron pipe is produced by heating and annealing the intermediate frequency furnace and then making the outer wall of the cement lining. The mechanical cast iron pipe does not need to be lined with cement.

The difference is two: the length of the ductile iron pipe is generally 6 meters and the wall thickness is large, and the length of the mechanism cast iron pipe is generally 3 meters and the wall thickness is small.

The third difference: ductile iron pipe can be used for municipal water supply and drainage, drinking water engineering and outdoor fire engineering, and the mechanism cast iron pipe is used for indoor high-rise drainage.

The difference is four: the ductile iron pipe is a slip-in connection with a flexible sealing ring, and the mechanism cast iron pipe is a clamp connection or a mechanical connection, and an inner gasket sealing ring.


2. Does the engine body use gray cast iron or ductile iron?

From a professional point of view, the structure of the engine block is more complicated. At the same time, the cylinder will be subjected to higher temperature and more heat, and more oil will be in the crankcase. Therefore, from these points In view of the fact, gray cast iron is better than ductile iron because gray cast iron is better than ductile cast iron in heat dissipation performance and lubrication performance.


3. Is pig iron and ductile iron the same? How does graphite cast iron avoid the problem of graphite floating?

Pig iron and ductile iron, in a strict sense, these are two different materials, although they are all iron-carbon alloys, because pig iron is iron ore smelted by blast furnace, ductile iron is made of pig iron and carbon through the blast furnace After smelting into molten iron and adding a spheroidizing agent, they are different in material.


Graphite cast iron wants to avoid the problem of graphite drift. It can be set up with a riser or cold iron, because graphite floatation is mainly related to carbon content, and it is also related to defects such as shrinkage and shrinkage. Moreover, after taking these measures, these defects can be