In silicon chromium alloy, the silicon content is usually 25% - 45%, the chromium content is 20% - 40%, and the rest is mainly iron. These elements work together to give the alloy unique properties. Silicon can enhance the deoxidation ability, and chromium can improve the hardness, wear resistance and corrosion resistance of steel.
Steelmaking and casting selection of suitable ferro silicon chromium alloys need to consider the following key factors
Steelmaking purposes
Ordinary carbon steel
If used for ordinary carbon steel production, the chromium content in SiCr alloys is relatively low, and the focus is on its deoxidation ability. Silicon chromium alloys with moderate silicon content and relatively economical prices can be selected to help remove oxygen from molten steel, improve the purity of steel, and appropriately increase the strength of steel.
Stainless steel
When producing stainless steel, the carbon content must be strictly controlled. Low-carbon or micro-carbon ferro silicon chromium alloys should be selected, and the chromium content must meet the stainless steel production standards. Chromium is a key element for stainless steel to form a passivation film. Sufficient chromium content can ensure the corrosion resistance of stainless steel. For example, in the production of 304 stainless steel, silicon-chromium alloy with a suitable chromium content needs to be added to ensure that the corrosion resistance of the final product meets the standard.
Special alloy steel
Special alloy steels such as heat-resistant steel and mold steel have specific requirements for the content and proportion of silicon and chromium in CrSi alloy. When producing heat-resistant steel, a higher chromium content is required to improve oxidation resistance and thermal strength; when producing mold steel, in addition to chromium, the silicon content also affects the hardness, wear resistance and hardenability of mold steel. According to the performance requirements of special alloy steel, the composition ratio of silicon-chromium alloy should be accurately selected.
Casting use
General castings
For the casting of general mechanical parts, select chromium silicon alloys that can refine grains and improve the strength and hardness of castings. Medium content of silicon and chromium can meet the needs, help improve the overall performance of castings, and reduce production costs.
Wear-resistant castings
The production of wear-resistant castings such as crusher hammers and wear-resistant liners requires ferro silicon chrome alloys with high chromium content to significantly improve the wear resistance of castings. Chromium can form hard spots on the surface of castings, resist wear, and extend the service life of castings.
