Why is the casting easy to be brittle and break when stainless steel precision casting

Stainless steel casting methods are generally precision casting. Stainless steel precision casting castings are prone to brittle fracture (brittle fracture) during shelling, machining and installation. If you encounter such a problem, the entire furnace will be burned out. There are many reasons for this phenomenon. The following is an example for everyone.

The causes of brittle fracture during stainless steel precision casting are as follows:

1. The amount of aluminum in the smelting deoxidizer is too large, and it will easily form aluminum nitride inclusions due to the nitridation reaction in the steel, which will make the casting brittle.

2. Too much boric acid is used in the furnace lining, which makes the carbon-boron compound in the steel "boron brittle".

3. Excessive carbon content and other alloying elements beyond the allowable range will also increase the brittleness of steel. For example, when pig iron is used to increase carbon, if it is accidentally added or calculated, it will inevitably bring harmful elements.

4. The molten steel is seriously overheated and the heat treatment is improperly operated, and the crystal grains are coarse.