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Advantages and disadvantages of stainless steel precision casting processing technology

Advantages and disadvantages of stainless steel precision casting processing technology
Friends working in the foundry industry are aware of the mechanical properties of stainless steel precision casting is higher than cast iron, but its performance than the cast iron worse, are called precision casting or precision casting. Its melting point is high relative to other, and the molten steel is easily oxidized, poor mobility of molten steel, shrink large, in fact, cast stainless steel precision tubes not only applicable to all types and alloy casting from a practical point of view.
    First of all, it is because of the poor mobility of molten steel, castings we produce in order to prevent cold shut and Misrun wall thickness of steel castings is not less than 8 mm; gating system structure to be 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 ℃
In order to prevent our stainless steel precision castings produced shrinkage, cracks and other phenomena, we must take these measures to make it uniform thickness, but also to avoid sharp corners and right-angle configuration, also in the need to increase the mold-use sawdust plus coke in the core, the last also need to use a hollow core and change the oil sand core or core sand concession and breathability.

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