As a professional manufacturer of cast iron covers, cast iron covers aspects of quality, technology, materials, etc. has a profound study. The quality of the cast iron covers, generally depends on several factors.

Depends on the quality of the cast iron covers its use: light weight with some of the South, the North because of the weather did heavy South generally 60KG-90KG 70KG common heavy covers northern generally 75-95KG.

The cast iron covers are not heavier the better the quality, its two most important parameters for the hardness and toughness. In general, the higher the hardness, the better the quality. However, high hardness, toughness but also good, this is good covers. To design, in addition to determining the cast iron covers geometry, size according to the working conditions and metal material properties, but also must be from the perspective of the cast alloy and casting process characteristics to consider the design is reasonable, that is obvious size effect and solidification, shrinkage, stress and other issues, in order to avoid or reduce the cast iron covers of segregation, deformation, cracks and other defects.

Is to have a reasonable casting process, the accumulation of years of casting process well known, and use the best materials, so to ensure the quality of our factory covers are the best.

1. Cast iron covers technical planning. When planning, in addition to be judged according to the working conditions and metal material properties, dash shape, scale the size of the cast iron covers, but also from forged alloy and forging technical characteristics point of view to consider the plan is reasonable, that is a significant scale effect and condensation, shortening, stress doubt as to prevent or reduce the cast iron covers of segregation, deformation, cracks and other defects occur.

2. Have a reasonable forging technology, namely on the basis of cast iron covers structure, component size and scale, forged alloy properties and production conditions, the selection of a suitable type and shape, making the core approach, a reasonable set of forged bars, cold iron, riser and pouring system so as to ensure access to quality cast iron covers.

3. We are forging quality of raw materials. Manhole covers as a shaft member, such as a diesel engine crankshaft, connecting rod, high strength, requires patience along with better mechanical properties of cast iron covers were tempered disposition.