1. due to the poor flowability of molten steel, steel castings to prevent cold shuts and water shortage, the wall thickness of steel castings can not be less than 8mm; strive gating system structure is simple, and the cross-sectional size larger than the cast iron; dry mold or hot mold; appropriately increasing the pouring temperature, typically 1520 ° ~ 1600 ℃, because the casting temperature is high, the degree of superheat of molten steel, long time remain liquid, liquidity can be improved. But the pouring temperature is too high, it will cause coarse grains, thermal cracking, porosity and sticky sand and other defects. It is generally small, and thin-walled castings of complex shape, its temperature is about pouring steel melting temperature + 150 ℃; large, thick-walled castings pouring temperature higher than the melting point of about 100 ℃.
2.appears to prevent the casting shrinkage, shrinkage defects, mostly using riser and cold iron and subsidies and other measures in the casting manufacturing process, in order to achieve solidification. In addition, to prevent the steel castings produced shrinkage, shrinkage, pores and cracks defect and should be made uniform thickness, avoid sharp corners and right-angle structure plus sawdust with sand in the mold, add coke in the core, and hollow core and oil sand core sand or the like to improve the core concession and breathability.

Cast high melting point, its corresponding pouring temperature is high. High temperature molten steel and mold material interaction, which is easy to produce sticky sand defects. Therefore, a higher refractoriness synthetic quartz sand to make a mold, and the brush is made of quartz sand powder or zirconium powder paint was prepared in the mold surface. To reduce the gas source, improve mobility and strength of the mold steel, steel castings mostly used to dry or drying type casting, such as the use of CO2 hardened sodium silicate sand.

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