The reasons for the brittle fracture of stainless steel castings are as follows:
1. The amount of deoxidizer-aluminum used in smelting is too high, and it is easy to form an aluminum nitride inclusion in the steel to make the casting brittle.
2. When the furnace lining is used, the amount of boric acid is too high, and the steel has a boron-boron compound.
3. the carbon content is too high and other alloying elements beyond the promised scale will also increase the brittleness of steel, for example, when using pig iron to increase carbon, the feeding is not careful or not accounted for, will certainly bring in harmful elements.
4. The molten steel is severely overheated and the heat treatment operation is not proper, and the crystal grains are coarse.