Speaker
Description
Ingot-casting continues to play an important role in producing high-quality semi-finished products of high-alloy steels for large machinery. The final products are critical components, including crankshafts, which are exposed to elevated levels of mechanical stress. Therefore, it is essential that they meet high quality standards. The quality of the steel is influenced by various factors throughout the entire process. During casting, the use of suitable refractory materials with appropriately designed channel geometries is crucial to prevent the formation of inclusions or surface defects. Whilst products must meet the highest quality standards, economic factors frequently influence the selection of refractory materials, resulting in the application of low-quality materials.
It is well known that certain alloying elements can reduce components of Al₂O₃-SiO₂ refractory materials, such as free SiO₂ and Fe2O3, which leads to the re-oxidation of the alloying elements. The specific elements involved can be estimated by consulting the electrochemical series. Based on this knowledge, suitable materials can be selected to decrease the reactions between liquid steel and the refractory material and thus inclusions in the product.
An additional measure that has the potential to enhance the quality of the ingot surface is the creation of an advanced channel design to ensure a constant flow of steel with minimal turbulence. A stable steel flow is crucial for producing an ingot with good surface quality, which subsequently results in reduced scrap. The innovative SmartCast spider brick design and customized endrunners are possibilities to ensure this.
The refractory material used during casting has a clear impact: Investing in refractory material means investing in the quality of the ingots.
| Speaker Company/University | Steuler-KCH GmbH |
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