Investment casting mounts

The determining role of chromium in stainless steel: There is only one element that determines the properties of stainless steel, namely chromium, and each stainless steel contains a certain amount of chromium. To date, there is no stainless steel that does not contain chromium. The fundamental reason why chromium has become a key element in determining the properties of stainless steel is that after adding chromium as an alloying element to the steel, it promotes its internal divergent movement toward a level that is conducive to resist corrosion and damage. This transformation can be seen in the following aspects: ① chromium raises the electrode potential of iron-based ionic crystals ② chromium absorbs electrons from iron to passivate it due to the prevention of anodic reflection, thus improving the corrosion resistance of metals and alloys. Film theory, adsorption theory and electron ordering theory are the keys to constitute the passivation of metals and alloys.

To avoid stress corrosion, titanium or niobium is added to stainless steel. The corrosion resistance of some stainless steels can be improved by molybdenum and copper. The effect of other elements on the properties and organization of stainless steel. In addition to the effect of these elements on the properties and organization of stainless steel, stainless steel also contains a number of other elements. Some are long-lived impurity elements, such as silicon, sulfur, phosphorus, etc., like ordinary steel for investment casting connection rods, and some are added for some specific stainless steel clad sand casting purposes, such as cobalt, boron.