What is stainless steel casting slag inclusion?

Slag inclusion in stainless steel casting is a mixture of external non-metallic materials, which can be divided into primary slag and secondary slag.

Primary slag: The slag generated during the smelting and treatment of molten steel flows into the furnace cavity with the water. Most of it is due to artificial or unsatisfactory slag retaining effect of the pouring system.

Secondary slag: The slag produced by the oxidation of molten steel during the pouring operation enters the mold cavity. This is mainly due to the serious jet flow in the inner soup channel.

Production practice has proved that sand may be produced from the sprue cup, sprue, sprue, cross runner, from the inner runner to the casting, mainly the assembled parts. During the entire production process, the pouring system white mold The coating on the surface falls off and cracks. The coating on the joint part of the white mold falls off and cracks. The coating on the surface of the white mold of the casting falls off and cracks. Factors such as loose sprue sealing lead to sand intrusion. The main reason for slag inclusion defects. Secondly, the process The selection of parameters, such as the size of the pouring head, the pouring temperature, the degree of negative pressure, the particle size of dry sand and other factors, as well as the model transportation process and packaging operations, have a great impact on the defects of casting sand and slag. Only in these links Only in this process can systematic measures be taken. In order to reduce and eliminate slag inclusion defects, castings must be obtained and operated carefully. Overcoming slag inclusion defects is a systematic project.

For cast steel, during the filling process of the metal material liquid and the gas in the cavity, the molding raw materials interact with each other to produce Al2O3.SiO2.MnO.FeO to form complex secondary slag. After entering the mold cavity, surface or internal slag holes are generated.

Deoxidation of aluminum is used to produce Al2O. If the particle size distribution is less than 5m, it cannot converge and grow within 10-30 minutes, reaching macroscopic slag visible to the human eye and can only be dispersed in the molten steel. Practice has shown that in the wet process of cast steel parts In production, aluminum is used for deoxidation, which easily produces slag on the upper surface or sides. Co-hardened sand contains moisture, so even if it is not dry, slag defects often occur.