Points for Attention in Steel Casting Processing

Dongguan Precision Casting Company Hongzhe adopts international excellent silica sol precision casting processing technology. Dongguan Precision Casting Company Hongzhe has a complete set of technical equipment and raw material composition testing instruments. For each furnace of molten steel with different raw materials, use a spectrometer to carry out on-site raw material composition measurement and analysis. If the raw materials are not enough or too high, high-precision casting is definitely not allowed, which ensures the quality and credibility of the products from the source.

1. Because of the poor circulation of desolvation, in order to avoid the cold barrier and insufficient pouring of the steel castings, the thickness of the steel castings should not be less than 8 mm; the construction of the pouring system should be simple and the cross-sectional specification should be larger than that of pig iron; Dry casting or hot casting; increase the pouring temperature appropriately, usually 1520°～1600°C. Due to the high pouring temperature, the high degree of superheat of the molten steel and the long time to maintain the liquid state, the flowability can be improved. However, if the pouring temperature is too high, it will cause defects such as coarse crystals, hot cracks, vent holes and sand sticking. Dongguan Precision Casting is aimed at castings that are usually small and medium-sized, thick-walled and complex in appearance. Its pouring temperature is about the melting point temperature of steel +150℃; the pouring temperature of large and thick-walled pipe castings is higher than the melting point of about 100℃. .

2. Hongzhe of Dongguan Precision Casting Company told us that because the gathering of steel castings greatly exceeds that of pig iron, in order to avoid shrinkage and shrinkage of castings, most of the forging processes adopt countermeasures such as gates, cold iron, and subsidies. , To complete sequential condensation. In addition, in order to avoid the defects of shrinkage cavity, shrinkage porosity, vent holes and cracks caused by steel castings, the wall thickness should be made uniform, oblique and right-angled structures should be prevented, wood chips should be added to the casting sand, and coke should be added to the core. , And the use of hollow cores and oil sand cores to improve the concession and air permeability of sand molds or cores.

The melting point of cast steel is high, and its pouring temperature is relatively high. At high temperatures, molten steel and mold raw materials affect each other, which is easy to cause the disadvantage of sand sticking. Therefore, synthetic quartz sand with high fire resistance should be used as the casting mold, and the surface of the casting mold should be brushed with a coating made of quartz powder or zirconium sand powder.