Characteristics of Stainless Steel Precision Casting Processing

The mechanical properties of stainless steel precision casting are higher than cast iron. However, its casting performance is worse than cast iron. Therefore, it belongs to fusion mould precision casting or precision casting. It has a high melting point, easy oxidation of the steel, poor fluidity of the steel and large shrinkage. Stainless steel precision casting is therefore suitable for all types and alloys of casting.

Features of stainless steel precision casting processing

1. The shrinkage of stainless steel precision casting greatly exceeds that of cast iron. To prevent shrinkage defects in castings, most casting process uses measures such as risers and, cold iron and subsidies. This method can achieve sequential solidification.

To prevent stainless steel castings from shrinkage, porosity and cracking defects, should make its wall thickness uniform, avoid sharp angles and right angle structure. Add sawdust in the sand used for casting, add coke in the core, and use hollow cores to improve the recession and permeability of the sand or core.

2. The poor liquidity of the steel. In order to prevent the cast steel parts produced by cold isolation and pouring insufficient, the wall thickness of the cast steel parts can not be less than 8mm. using dry casting type or hot casting type; appropriate to improve the pouring temperature, generally 1520 ° ~ 1600 ℃. Because the pouring temperature is high, the steel superheat degree is large, keeps the liquid state for a long time, liquidity can be improved. If the pouring temperature is too high, will cause grain coarseness, thermal cracking, porosity and sticky sand and other defects.

Therefore, for small, thin-walled and complex precision castings, the pouring temperature is about 150°C above the melting point of the steel. The structure of the pouring system should be simple and larger in cross-section than that of cast iron. The pouring temperature for large, thick-walled castings is about 100°C higher than their melting point.

Conclusion

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