By silica sol precision casting precision casting a OEM casting, casting requirements RT2 level, 100% of PT, VT full inspection, duplex stainless steel is made of super line, from the appearance of the casting size, outline size is 700 mm * 500 mm * 470 mm, and the quality is about 130 kg;Combined with water the risk system, the quality is about 220 kg, in the casting of silicon sol process a larger parts.Casting Jane body wall thickness of about 20 mm (/), is evener, cubes in the wall thickness of 27 mm, cylinder parts and cube combination of transition form the size of the ship o mm 4 hot pitch, cubes and bottom plate connecting transition place and form the size of four hot pitch circle indicates a 60 mm.8 from precision casting solution of casting hot feeding can get no shrinkage cavity defects of castings, the second is to solve the casting slag blowhole defects.Precision casting on the hot iron (stick), the application of cold iron, although solves the defects of castings, but have not form a system of test data, the need for different structure in the production of castings, decorate in the different locations of different diameter, length, width and height size with a hot iron (stick), cold iron.E = "Verdana" > 800 ℃ to 1200 ℃, and between the three kinds of materials use temperature rise in turn.Low plasticity, high brittleness is iron chromium aluminum is the chief drawback of electrothermal alloy material, especially between 400 ℃ to 800 ℃, use for a long time can make the material in precipitation "CrFe" type metal compounds, lead alloy plastic fell sharply, appear serious embrittlement phenomenon, so iron chromium aluminum series electric heating alloy material to avoid forming in this temperature region and use.Surface load refers to the unit surface area on the electric heating element for electrical values.The surface of the material using load intensity is higher, shorter service life of the material, but also the consumption of materials of the smaller.So, reasonable choice of components heat load intensity, the electric heating element has high thermal efficiency, long service life, the comprehensive effect of saving material.