Slag inclusions are produced in the process of stainless steel casting, which are divided into primary slag and secondary slag.
Primary slag: the slag produced in the process of molten steel smelting and treatment flows into the furnace cavity with water flow. Most of them are caused by the artificial or unsatisfactory slag retaining effect of the pouring system.
Secondary slag: the slag produced by molten steel oxidation during pouring operation enters into the mold cavity. Most of them are caused by the serious spout of the internal soup channel.
Production practice has proved that from sprue cup, direct sprue, direct sprue, cross sprue, internal sprue to casting, all parts may cause sand entry, especially the joint part. In the whole production process, the main reasons for the defects of sand entry and slag inclusion are the paint peeling off and cracking on the surface of the white mold of the pouring system, the paint peeling off and cracking on the joint part of the white mold, the paint peeling off and cracking on the surface of the white mold of the casting, and the airtight closure of the sprue. Secondly, the selection of process parameters, such as the size of pouring head, pouring temperature, negative pressure, dry sand size and other factors, as well as the model transportation process and packing operation, have a great impact on the casting sand and slag inclusion defects. Only by adopting systematic measures and careful operation in these links can the slag inclusion defects be reduced and eliminated, and high quality castings can be obtained. It is a system engineering to overcome the slag inclusion.
For steel castings, during the filling operation, the metal material liquid and the gas in the mold cavity and the molding raw materials interact, resulting in Al2O3, SiO2, MnO, FeO and other complex secondary dregs, which enter the mold cavity and generate surface or internal slag holes.
If the particle size distribution of Al2O3 is less than 5m, it can’t aggregate and grow in 10-30min, so that the macroscopic slag can be seen by human eyes, and it can only disperse in the molten steel. The practice shows that in the wet production of stainless steel casting, aluminum is used for final deoxidation, and slag inclusions are easily produced on the upper surface or side. The water content in the CO 2 hardened sand of the water glass often causes slag defects even if it is not dry.
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