Precision casting parts are very common types of castings, castings may occur in the high carbon content of the situation, for the reason that there are many high carbon content, to find out the root cause to be able to carry out faster processing. Stainless steel is essentially a higher carbon content, stainless steel variation, according to the hot rolling can make it have a higher compressive strength, is a high silicon content of stainless steel, with high resistance to high temperature air oxidation characteristics.
1. The configuration of the pouring system is not scientific: in particular, the vacuum packaging system software and pouring sand box or casting pouring processing process design is not equipped with scientific, resulting in the casting in the whole process of pouring, the vacuum value in the pouring sand box is not the same. The error is too large, or the specific vacuum value is not enough. The carbon content in the manufacturing smelting seasoning is not strictly controlled, especially the carbon content in each scrap of steel and the variety of scrap of steel, is not the prevalence of raw materials with other metal ingredients unknown.
2. Pouring standard setting is not scientific: such as pouring filling method set too long, precision vacuum casting lead to pouring the whole process of pouring steel temperature is low, especially for the casting wall thickness expansion parts, pouring steel condensation speed is relatively slow, promote the use of steel and look decomposition reaction products between the time to improve, increase the amount of stainless steel casting nitriding and carbon accumulation.