Effect of carburizer quality on the quality of gray cast iron cylinder block and head casting

Effect of carburizer quality on the quality of gray cast iron cylinder block and head casting

Based on the quality problems and improvement cases of cylinder block and cylinder head castings in induction furnace melting conditions, this paper discusses the impact of carbon additive quality on the N holes, melting quality, processing performance, and surface roughness of cylinder block and cylinder head castings. Using carbon additives that have been thermally graphitized can effectively prevent the formation of N pores and improve the melting quality of the molten iron. It can also improve the density of the casting structure and reduce the scrap rate of leakage defects. After being thermally graphitized, the carbon additive has an ideal crystallinity and can reduce the tendency of shrinkage in the molten iron, improving the processing performance of the casting. It can also be quickly dissolved and absorbed during melting, eliminating unmelted graphite in the molten iron and improving the surface roughness of the casting during processing.

(1) Using carbon additives that have been thermally graphitized can effectively reduce the risk of N pores in the casting, and the w(N) content and w(S) content of the carbon additive are key indicators of its quality:

(2) After being thermally graphitized, the carbon additive can effectively improve the melting quality of the molten iron and improve the density of the casting structure, reducing the scrap rate of leakage defects:

(3) After being thermally graphitized, the carbon additive has an ideal crystallinity and can reduce the tendency of shrinkage in the molten iron, improving the processing performance of the casting:

(4) After being thermally graphitized, the carbon additive can be quickly dissolved and absorbed during melting, eliminating unmelted graphite in the molten iron and improving the surface roughness of the casting during processing.