Annealing: Annealing is to heat the steel castings to 20 to 30 degrees Celsius above Acs, which is suitable for all grades of steel castings.
Ductile Iron Casting process: various castings are heated to a temperature of 860-900 ° C, the original substrate is all austenitized and then cooled in oil or molten salt to achieve quenching, and then heated and tempered at 250-350°C
When the dewaxing kettle pressure gauge indicates that the pressure is zero, open the wax discharge valve, drain the wax, open the dewaxing kettle door, and pull out the basket of the molded case.
Investment casting, in simple terms, uses a fusible material to make a fusible model, which is then coated with several layers of special refractory coatings, followed by drying and hardening.
Due to the poor fluidity of molten steel, in order to prevent cold insulation and insufficient pouring, the wall thickness of precision castings should not be less than 8mm.
The processing of stainless steel castings directly affects the quality of stainless steel castings. Although the general working process is similar, stainless steel casting is different from ordinary carbon steel casting.
In order to save materials and energy, and improve the efficiency of machining, casting methods and materials such as precision casting, precision forging, cold rolling, profiled steel should be fully considered.
Because the melting point of stainless steel castings is high, the molten steel is easily oxidized, the fluidity of molten steel is poor, and the shrinkage is large. The body shrinkage is 10 to 14%, and the linear shrinkage is 1.8 to 2.5%.