苏春霞, 陈本文, 付超, et al. An Analysis on Crane- Conveying Fracture of Partial 170 mm Casting Slab of Steel 25SiMn2 and Improving Measures[J]. Special Steel, 2014, 35(4): 34-35.
苏春霞, 陈本文, 付超, et al. An Analysis on Crane- Conveying Fracture of Partial 170 mm Casting Slab of Steel 25SiMn2 and Improving Measures[J]. Special Steel, 2014, 35(4): 34-35.DOI:
The cause for fracture of partial 22 t 170 mm x 1 650 mm x 10 000 mm casting slab of steel 25SiMn2 during crane-conveying process has been examined and analyzed. Results show that during casting the superheating extent of liquid steel in tundish is higher (30 ~36 °C) led to significant columnar crystal growth at 1/4 thickness of slab
poor fluidity of molten steel and lack back feeding during solidification
as result a lot of micro-shrinkage cavity occur causing crack at micro-shrinkage cavity by stress concentration effect and finally causing fracture of slab by repeating crane-conveying and acting with self-gravity. The fracture of casting slab is availably avoided by decreasing superheating extent of liquid in tundish to 10 ~30 ℃ and reducing times of crane-conveying of slab.