Internal quality and casting method of Heat-resistant Castings

- Jun 22, 2018-

Heat-resistant castings with excellent casting properties can be made into complex parts directly and generally have good machinability, wear resistance and shockproof, low price and so on. The carbon content of industrial cast iron is generally 2% and 4%. The carbon in cast iron is mostly in graphite form and sometimes in cementite form. In addition to carbon, cast iron also contains 1% of silicon, as well as manganese, phosphorus, sulfur and other elements.


The hard spots of heat-resistant castings are formed effectively during casting. Molten steel spattered during casting forms steel beans of different sizes, and in order to prevent spattered molten steel from falling when casting steel parts, All casting risers should be covered with a thin iron plate, pouring a box open to avoid casting hard spot defects.


The production process of large heat-resistant castings is a complex system engineering, the production of high-precision products to meet the domestic demand must involve many new materials, new processes, new technologies, The key technology in the manufacturing process must also involve many fields and aspects in the process of material processing. Cast carbon steel, cast low-alloy steel and cast special steel 3, cast carbon steel. Cast steel with carbon as the main alloy element and a small amount of other elements.


In order to improve the internal quality, dimensional precision, surface smoothness and production efficiency of heat-resistant castings, metal mold and pressure casting are mainly used in some degree. Due to the large latent heat of solidification, the solidification process time of liquid aluminum is much longer than that of cast steel and cast iron under the same weight.