Gray cast, which is a specific type of casting, and is made of gray cast iron, so this type of casting is called gray cast. The following is to learn and master the knowledge of this type of casting, and then, the product can be used correctly and reasonably in the right place.
1. What is the gray cast iron used in the gray casting?
Gray cast iron used in grey castings, which is a material used in cast iron. It is based on a pearlite or ferrite matrix and is slowly cooled after casting to promote graphitization of the material. Further, to obtain a cast iron of gray cast iron, the fracture is grayish black, so that it can be well distinguished from white cast iron.
2. Product selection of gray mouth castings
The purchase of gray cast products is important because it is an important task, so it needs to be taken seriously and all relevant factors are taken into consideration. It is necessary to comprehensively and comprehensively consider these factors so that accurate judgments and correct choices can be made. To the right product. In terms of product purchase considerations, there are some factors that must be considered, such as the origin, parameters, quality, real-time quotation and price of the product, product quality, etc. If necessary, the product use environment and usage requirements can also be considered. These two.
In addition, it is also necessary to know that there are some specific requirements in the choice of the manufacturer of the product, because if the wrong choice occurs, it will affect the normal use and use of the product, so it should not be underestimated and sloppy. In the selection requirements, it is required to select professional and regular manufacturers, so as to ensure product quality and product performance.
3. Heat treatment of gray mouth castings
The heat treatment of the gray cast casting is usually only annealed or surface hardened. However, the gray cast iron material can be improved by alloying and heat treatment. The specific contents are as follows:
Stress relief annealing: For some shapes with more complicated gradual, in order to ensure dimensional stability and prevent deformation and cracking, stress relief annealing can be performed to achieve the purpose.
High temperature annealing: its main purpose is to reduce hardness and improve the cutting performance of castings.
Surface hardening: It is to make the surface of some large castings have high hardness and wear resistance, and can be carried out after machining.www.xihuafoundry.com