Introduction of High Silicon Wear Resistant Cast Steel     The patented high silicon wear resistant cast steel was authorized to produce under the permission of Tsinghua University (ZL 99105704.X). With silicon as the main alloying element, high silicon wear resistant cast steel utilizes a new invented composition, casting and heat treatment technique in the production. The micro structure of high silicon wear resistant cast steel is composed of austenite-bainite (A-B) or austenite-bainite-martensite (A-B-M) phases. High silicon wear resistant cast steel has many characteristics such as high strength, high toughness, excellent wear and impact resistance etc., it is a new kind of wear resistant material substituting for high manganese steel and high chromium cast iron.     Technical Specifications: Tensile strength(σb)=1200~1800MPa; Yield strength(σ0.2) =1000~1600MPa; Elongation(δ)≥5%; Impact toughness (αkV) ≥20J/cm2; Hardness (HRc) =35~48 (before use) and 50~58(after impacting and hardening).     Service Performance: The initial hardness of high manganese steel is low, its wear resistance depends totally on the work hardening effect in use. The work hardening effect can not be fully accomplished in the condition that the impact strength is not enough, high manganese steel has short service life. High chromium cast iron has high hardness and excellent wear resistance, but its toughness is very low, it is apt to fracture while bearing heavy impact loads. High silicon wear resistant cast steel overcomes the shortcomings of high manganese steel having low hardness and high chromium cast iron having low toughness, it has high initial hardness and better work hardening effect under impact wear, its wear resistance and dependability are obviously higher than that of high manganese steel and high chromium cast iron, the service life can be raised by more than one time.     Application Scopes: High silicon wear resistant cast steel is mainly used for making spare parts for crushing, excavating and grinding etc. in metallurgy, mine, building materials, electricity and chemical industries. The hammer and jaw plate of crusher, the bucket tooth of digging machine and liner of ball mill manufactured by this new material has excellent service performance, the products have already been sold to various provinces in China including Hong Kong.