The process of cast steel and forged steel determines the performance of the coupling

XINLANCouplingAnalysis of the mechanical properties of cast steel is higher than cast iron, but its casting performance is worse than cast iron.Because of the high melting point of cast steel, the molten steel is easy to oxidize, the fluidity of molten steel is poor, and the shrinkage is large. Its body shrinkage rate is 10-14% and linear shrinkage is 1.8-2.5%.In order to prevent defects such as insufficient pouring, cold separation, shrinkage and porosity, cracks and sand sticking of steel castings, more complicated process measures than cast iron must be adopted:
　　1. Due to the poor fluidity of molten steel, in order to prevent cold barriers and insufficient pouring of steel castings, the wall thickness of steel castings should not be less than 8mm; the structure of the pouring system should be simple and the cross-sectional size is larger than that of cast iron; dry casting is used Or hot mold; appropriately increase the pouring temperature, generally 1520°～1600°C, because the pouring temperature is high, the molten steel has a high degree of overheating, and the liquid state is maintained for a long time, and the fluidity can be improved.However, if the pouring temperature is too high, it will cause defects such as coarse grains, thermal cracks, pores and sand sticking.Therefore, the casting temperature of small, thin-walled and complex-shaped castings is generally about the melting point temperature of steel + 150°C; the casting temperature of large, thick-walled castings is about 100°C higher than its melting point. 2. Since the shrinkage of cast steel greatly exceeds that of cast iron, in order to prevent shrinkage cavities and shrinkage defects in castings, most of the casting processes adopt measures such as risers, chilled iron, and subsidies to achieve sequential solidification.
　　In addition, in order to prevent the occurrence of shrinkage cavities, shrinkage porosity, pores and cracks in steel castings, the wall thickness should be uniform, sharp corners and right-angle structures should be avoided, sawdust should be added to the casting sand, coke should be added to the core, and Hollow cores and oil sand cores are used to improve the retreatability and air permeability of sand molds or cores.
       Forging is a commonly used forming method in mechanical manufacturing.Forging can eliminate the loose as-cast metal and welding holes, and the mechanical properties of forgings are generally better than those of castings of the same material.For the important parts of machinery with high load and severe working conditions, forgings are mostly used except for simpler shapes that can be rolled, profiles or welded parts.
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