What is the main reason for cracking of stainless steel castings?

Stainless steel castings are made of various stainless steel materials. The main cause of cracking of stainless steel castings is the casting structure. What is the main cause of cracking of stainless steel castings?

The causes of stainless steel casting cracks are as follows:

1. Smelting.

Minimize the smelting PS during the smelting process to reduce the content of harmful elements, NHO gas and inclusions. The use of low phosphorus master alloy has good results.

2. Casting structure.

The structure, shape, and size of the casting should be comprehensively considered. Appropriate process parameters should be selected to prevent casting defects such as shrinkage cavities.

3. Insulation.

The heat preservation time of sand castings is mainly controlled at the unboxing temperature below 70 degrees Celsius to ensure that the shrinkage of liquid and solid is completely completed and to avoid stress concentration caused by external factors.

4. Falling sand.

When cleaning castings, sand molds and castings are not allowed to be poured during boxing, and external impact is not allowed to avoid cracks caused by the interaction between external forces and the internal stress of the castings.

5. Strengthen annealing.

Increase the stress relief annealing process of large stainless steel castings and strictly control the insulation time and furnace temperature. This invention aims to reduce the new stress concentration generated during the production process so that the stress in the castings can prevent cracks.

6. Cut the riser.

According to the casting conditions, select the appropriate hot cutting and pouring riser process to ensure that the starting temperature of hot cutting is not lower than 30,000 degrees Celsius. The gas cutting gun and oxygen blow pipe are all cut by vibration.

The main reasons for cracking of stainless steel castings are the above aspects. Now we should understand the situation of stainless steel castings. We all need to use stainless steel castings correctly.