With the continuous construction of urban society, the demand for ductile iron manhole covers is also increasing, so what does the quality of ductile iron manhole covers depend on? What are the factors that affect the quality of ductile iron manhole covers?

1. Design processability: When designing, in addition to determining the geometry and size of the manhole cover according to the working conditions and the properties of the metal material, the rationality of the design must also be considered from the perspective of casting alloys and casting process characteristics.

2. There must be a reasonable casting process: that is, according to the structure, weight and size of the casting, the characteristics of the casting alloy and the production conditions, select the appropriate parting surface, shape, and core-making method, and set up the casting ribs, cold iron, Riser and gating system, etc. To ensure high quality castings.

3. The quality of raw materials for casting: the quality of materials such as metal furnace charge, refractory material, fuel, flux, modifier, casting sand, molding sand binder, coating, etc. is not up to standard, which will cause pores, pinholes, slag inclusions, sticking Defects such as sand will affect the appearance quality and internal quality of iron castings, and in severe cases, the castings will be scrapped.

4. Process operation: It is necessary to formulate reasonable process operation procedures to improve the technical level of workers so that the process procedures can be implemented correctly.

The above is the explanation of the factors affecting the quality of ductile iron manhole covers.