Several common ductile iron casting material selection and treatment skills

Today, Wuxi Hongming Casting Co., Ltd. will introduce ductile iron castings to you. Ductile iron is an important casting material, which is widely used in industrial production. The selection of the appropriate ductile iron casting material and the correct handling techniques are crucial to ensure the quality and performance of the casting. This article will introduce several common ductile iron casting material selection and treatment skills.

First of all, it is very important to choose the right ductile iron material. According to the structure and performance characteristics of ductile iron, commonly used ductile iron materials can be divided into gray cast iron, ductile cast iron and vermicular cast iron three categories. Gray cast iron has high hardness and wear resistance, which is suitable for making friction pairs and parts with serious wear. Ductile iron has good toughness and tensile strength, which is suitable for parts with large forces; Vermicular graphite cast iron has high heat and corrosion resistance and is suitable for parts in high temperature and corrosive environment.

Secondly, the reasonable treatment of ductile iron material is the key to ensure the quality and performance of the casting. The first is the melting process, in the smelting of ductile iron need to control the melting temperature and time, to ensure that the molten iron obtained by melting uniform and stable composition. The second is the pouring process, the pouring temperature and cooling speed have an important impact on the structure and performance of the casting. The proper pouring temperature should be selected according to the shape and size of the specific casting, and the cooling speed of the casting should be controlled to avoid deformation and cracks caused by excessive temperature gradient. The end is the heat treatment process, for some need to improve the performance of ductile iron castings, you can carry out normalization, quenching and tempering and other heat treatment processes to improve the strength and toughness of ductile iron castings.

In addition to choosing the right material and reasonable treatment, the following aspects should also be paid attention to to ensure the quality of ductile iron castings. The first is the design and structure of the casting, and the shape and size of the casting should be reasonably designed according to the use environment and the force situation, to avoid the possibility of stress concentration and cracking. Secondly, the mold and pouring system of the casting, the mold should have good ventilation and smooth pouring system to avoid defects such as sand holes and inclusions. At the same time, it is also necessary to master the parameters of casting temperature, casting speed and pouring pressure of the ductile iron to ensure the quality of the casting. The end is the surface treatment of the casting, you can choose to grind, polishing and painting methods to improve the surface finish and corrosion resistance of the casting.

To sum up, the choice of the appropriate ductile iron casting material and the correct handling techniques are crucial to ensure the quality and performance of the casting. In the selection of materials to consider the use of the casting environment and the force situation, choose the appropriate ductile iron material. In the process of treatment, it is necessary to master the melting, pouring and heat treatment processes to ensure that the composition of the casting is uniform and stable to avoid defects and deformation. At the same time, attention should also be paid to the design and structure of the casting, the optimization of the mold and pouring system, and the importance of surface treatment. Through reasonable selection of materials and correct treatment to ensure the quality and performance of ductile iron castings, improve the competitiveness of products.