Defects of the steel billet in continuous casting

Abstract

In continuous casting process, defects of the steel billet (e.g. crack, pinhole, blowhole, central shrinkage, slag entrapment and appearance deviation, etc.) negatively affect the quality and the yield of rolled products. This research has been carried out to investigate some defects which often occurred in Vietnamese steel plants. The experimental work was conducted in an industrial 4-strands continuous casting machine with the billet’s cross-section of 130×130 mm2. The position, generating cause identification of these defects and proper measures have been discussed. A change in the steel compositions and the water distribution during secondary cooling was applied to improve the steel billet quality It has shown that the billet defects have greatly decreased and the quality of billet has obviously increased.

Crack damage monitoring for compressor blades based on acoustic emission with novel feature and hybridized feature selection

“…The SCES feature is expressed as equation. (2). Especially, energy ringing (ER) is adopted for the energy exceeding the threshold.…”

“…1 In manufacturing process of blades, there are several tiny blowholes and micro cracks, which are the early defects for compressor blades. 2 With the presence of an artificial flaw and in-service loading of centrifugal force, the early defects are damaged and tended to cracks, which release the acoustic emission (AE) waves during this process. 3 For the structural health monitoring (SHM) of compressor, the crack propagation and potential safety risks can be effectively avoided by monitoring the onset of crack in advance.…”

Effects of Sulfur on the Surface Crack in Medium Carbon Bloom

“…[2] Moreover, the cracks in continuous casting slabs or billet generated during the actual production have yet to be completely solved. [3,4] Therefore, an increasing number of researchers are focusing on continuous casting slabs or billet cracks.…”