Why does gray iron castings hard?

The comprehensive mechanical properties of gray cast iron are low, due to the presence of flake graphite. The metal matrix structure is split and the effective area of ​​load-bearing is reduced. However, the gray iron castings’ vibration damping, wear resistance, castability and machinability are better.

If the gray iron casting is too hard to machine during processing, we recommend the following inspection and rescue methods:

  1. If the manganese content is too high, the surface of gray iron castings will be hard. Therefore, It is necessary to check the chemical composition.
  2. The gray iron casting will be hard if the thin-walled cooling process is too fast.
  3. Due to the relatively high hardness of gray iron castings, choosing a reasonable tool is necessary. You can use G8 for rough machining, G6 for semi-finishing, and G3 for finishing. It is also necessary to select the appropriate speed and feed rate.
  4. Annealing treatment can eliminate the hardness of the casting itself, and lower the hardness of the casting as well. 

Yide Casting provides gray iron castings parts for kinds of industry, high attention to producing the qualified and high-quality casting parts according to the requirements from our customers, all of our casting products can be checked after selling. We provide both casting and machining by ourselves, has our own casting workshop and machining workshop, and we also have long term cooperator to do complex machining. If you are looking for a professional casting foundry, please don’t hesitate to contact us for a quick quote, and you are also welcome to visit our factory for better work.


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