Analysis of the reasons why stainless steel precision castings are prone to brittle fracture

The stainless steel casting method is generally precision casting. Stainless steel precision castings are prone to brittle fracture (brittle fracture) during shelling, machining and installation. If such a problem is encountered, the entire furnace will burn out. The reasons for this phenomenon There are many. Here is an example.

The reasons why stainless steel precision castings are prone to brittle fracture are as follows:

1. If the aluminum content of the molten deoxidizer is too large, it will easily form aluminum nitride inclusions due to the nitridation reaction in the steel, making the casting brittle.

2. Too much boric acid is used in the furnace lining, which causes "boron embrittlement" of the carbon-boron compounds in the steel.

3. Alloying elements such as excessive carbon content exceeding the allowable range will also increase the brittleness of the steel. For example, when adding carbon to pig iron, if the materials are not carefully added or calculated, harmful elements will inevitably be introduced.

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