Comparison and application examples of ductile iron and cast steel and gray cast iron

- Dec 03, 2018 -

Ductile iron, which is a common and commonly used material, is widely used in some industries and fields. Therefore, it is necessary to comprehensively and deeply understand the correct and rational use of this material, so as to obtain specific The product also guarantees the performance and use of the product, and allows the spheroidal graphite cast iron material to perform its intended function and function.


1. Can spheroidal graphite cast iron be used to make manhole covers?

Ductile iron is a material that can be used to manufacture the manhole cover. The finished product is a ductile iron manhole cover and is one of the ductile iron products. Moreover, it has a significant improvement in strength, ductility and toughness compared to a manhole cover made of carbon steel. In the shape of the manhole cover, there are generally two types of round and square. In the urban area, the circular shape is adopted, and in the countryside and the cable well, the square shape is adopted.


2. Comparison of ductile iron and cast steel

Ductile iron and cast steel, which are two different materials, but can be compared in terms of strength. Ductile iron is higher in yield strength than cast steel because its yield strength is generally above 40k, and the yield strength of cast steel is only 36k. In addition, ductile iron is better than cast steel in corrosion resistance and oxidation resistance. In terms of vibration damping performance, it is also better for ductile iron. In terms of cost, ductile iron is lower than cast steel, and this is one of the reasons why ductile iron has more applications.


3. Comparison of gray cast iron and ductile iron

Gray cast iron and nodular cast iron, both of which belong to cast iron, but are two different types of cast iron, because the graphite in the gray cast iron structure exists in the form of flakes, while the graphite in the ductile cast iron structure exists in the form of spheres. Moreover, due to the differences in the organization of the two materials, they have a huge difference in performance, specifically:


Gray cast iron has low strength and small plasticity and high brittleness, but it has good vibration damping performance. Therefore, it is used to produce some parts with low strength requirements, such as various boxes and bases; ductile iron, which has certain The plasticity and good toughness are used to make parts with high strength and toughness and complex shapes, such as crankshafts and connecting rods in internal combustion engines. In addition, ductile iron can also be strengthened by heat treatment, while gray cast iron cannot.


4. Ductile iron and pig iron, which one contains which?

From a professional point of view, pig iron contains ductile iron because spheroidal graphite cast iron is one of the pig irons. Pig iron, which is an iron-carbon alloy with a carbon content greater than 2%. If it is industrial pig iron, its carbon content is generally between 2.5% and 4%, and contains C, SI, Mn, S, P and other elements, according to There are different forms of carbon in pig iron, which can be divided into three types: steelmaking pig iron, foundry pig iron and