The formation of hot cracks during solidification leads to a high defect volume in industrial steel castings, resulting in an increased effort in post-processing and increased production cost. Thus, it is necessary to determine the influences on hot tearing in cast steel. The Submerged Split Chill Tensile test provides a suitable test method for evaluating these influences. Hot cracks form during solidification in the two-phase area, close to the solidus temperature of the steel and when a critical load exceeds. In the present thesis, the alloy G17CrMoV5-10-2, classified as susceptible to hot cracking from operational observations, was examined for its susceptibility to hot tearing. The work's second part deals with the characterization of steels with increased boron content. This element is used in cast steel to improve the hardenability and creep resistance. Within the scope of this work, G17CrMoV5-10-2 proved not to be susceptible to hot cracking under the selected laboratory conditions. The boron-alloyed steel grades show a different behaviour resulting in massive damage under similar testing conditions. However, the increase in the number of cracks strongly depends on the added boron content, and a distinct increase in the hot cracking tendency is observed if the boron content exceeds 75 ppm. In both investigated steel grades, a coarsening of the microstructure by applying a ZrO2 coating increases sensitivity to hot cracking.