1. Due to the poor fluidity of molten steel, in order to prevent the cold separation and pouring of stainless steel casting parts, the wall thickness of stainless steel casting processing can not be less than 8mm, the casting system is simple in structure, and the section size is larger than c. ast cast iron, dry casting or hot casting. The pouring temperature is generally 1520 ° 1600 ° C. Due to the high pouring temperature, the molten steel has high fluidity, high superheat and long liquid retention. However, if the pouring temperature is too high, it will cause defects such as coarse grains, cracks, pores and sand. Therefore, the characteristics of stainless steel casting process, in general, small, thin-walled and complex castings, casting temperature of about + melting temperature of steel + 150 ° C, large, thick-wall casting temperature than its melting point of about 100 ° C.

2. Since the shrinkage rate of stainless steel casting processing is much higher than that of cast iron, in order to prevent the shrinkage and shrinkage defects of the casting, in the casting process, the riser and iron, subsidies and other measures are mostly used to achieve sequential solidification. In addition, in order to prevent shrinkage, shrinkage, porosity and crack defects in stainless steel casting parts, the wall thickness should be uniform, avoid sharp angle and right angle structure, increase wood chips to mold sand, add coke as core, and adopt hollow core and improve sand type. Or the yield and permeability of the core is the core of the oil sands.

Stainless steel casting process characteristics

3. The melting point of stainless steel casting process is high, and the corresponding pouring temperature is also high. The interaction of molten steel and castable at high temperatures is prone to sticking sand defects. Therefore, artificial quartz sand with high refractoriness should be used as the casting mold, and coatings made of quartz powder or zirconium sand should be applied to the surface of the mold. In order to reduce the gas source and increase the flowability and casting strength of the molten steel, most stainless steel casting parts are dry or fast-drying, such as CO2 hardened water glass sand.

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