Mold burned onto ingot 1.2.

Mold burned onto ingot 1.2. - Ingot defects

Figure 1: Mold 1.2 after emptying of the ingot.

Defect name: No data.
Record No.: 2810
Type of defect (Internal/Surface): Surface
Defect classification: Ingot defects
Steel name: Steel
Steel composition in weight %: No data.
Note: The purpose of this thesis has been to evaluate the use of a swirl blade in the uphill teeming process through plant trials. Two series of trials were carried out at Scana Steel Stavanger AS. In the trials a divergent entrance nozzle with a 62° outlet angle were used when casting duplex stainless steel on a base plate with two 6.2 tons ingots. All molds were burned onto the ingots; leading to problems with emptying the ingots from the molds and severe damages on the molds. To get a better insight during the casting and understand why the molds were burned onto the ingots; during the second series of trials one mold on each base plate were filmed in the beginning of the casting process. Evaluation of the castings indicated that splashing on the mold wall at an initial stage was one reason for the mold burned onto the ingot. Further, material samples were collected to evaluate the Non-metallic inclusion composition and distribution with SEM when casting with a swirl blade compared to when casting without. The area percentage of the inclusions in the samples was 1% and 2% for samples casted with and without swirl blade respectively with d=2.8 mm. The inclusion size also varied for samples casted with and without swirl blade; 98% of the inclusions were in the size range of 0-10 µm when casted with and in the size range 0-20 µm when casted without swirl blade.
Reference: Not shown in this demonstration version.