THE CASTING PROCESS OF STAINLESS STEEL PRODUCTS

Stainless steel is the common name for a large group of ferrous alloys that are resistant to rust. This rust-resistance makes it a good choice for many applications, including outdoor, aqueous, and high-temperature uses. An overview of the casting stainless steel steps involved is given below.

• Manufacturing of pattern, cores: Mold for stainless steel casting is designed and produced according to the exact shape of a product. Based on detailed drawings, they will make the casting pattern and the cores. The casting pattern is used to create a mold cavity that bears the appearance and the core to make to create the inner shape of the casting product. The material for it is selected by aluminum alloy which features a low melting point, low hardness, low price and lightweight.
• Manufacturing of casting mould: A large number of wax models are produced by injecting wax into an aluminum alloy mold where the pattern and cores are placed. After taking out the wax models from mold, workers will need to check the dimensions of them and then assembly them together The previous model will be first painted with industrial glue, then sprayed with a layer of fine sand (usually used sand is silica sand) and naturally dry under the room temperature. This stage will be repeated multiple time, according to the surface requirements, size, weight of stainless steel castings. The result is a production complete wax model.
• Sand shell making: Before baking process, evenly coat the shell with a layer of white industrial latex in order to adhesive and and seal wax models. Heating the wax model in a special oven with metal seal at about 150℃. The wax model after heating will be melted and flow out along the tube gate. This process is called dewaxing. The wax model after dewaxing is just an empty sand shell which is ready for pouring. 
• Pouring: The desired steel alloy (including steels, at least 10.5% chromium, less than 1.2% carbon and other alloying elements) is melted in a large furnace and brought to cast temperatures at over 1500 degrees. Then, pouring it into dewaxed sand shell, the liquid stainless steel will fill fully the sand shell, including the middle part of casting product.
• Removal of the castings: After cooling and solidification of stainless-steel liquid, break the outermost sand shell by means of mechanical tools. The displayed solid stainless steel part is the original pattern's shape, also is the final required blank. 
• Surface treatment: The product will be cut, separated and then polished to become a single stainless steel casting blank.