李杰, 郑京辉, 刘小军, et al. Control of Casting Slab Surface Longitudinal Cracks of 0.12%-0.16% C Chromium Molybdenum Steel[J]. Special Steel, 2016, 37(2): 32-35.
李杰, 郑京辉, 刘小军, et al. Control of Casting Slab Surface Longitudinal Cracks of 0.12%-0.16% C Chromium Molybdenum Steel[J]. Special Steel, 2016, 37(2): 32-35.DOI:
14CrMo and 15CrMo is metal-110t BOF-LF-VD-300 mm x (1700-2400) mm slab CC process. The effect of factors including carbon content in steel
Mn/S
mold inverted taper and immersion nozzle insertion depth on casting slab longitudinal cracks is analyzed. By optimizing the mold inverted taper from before optimization 1.10 for three kinds of steel to 1.20 for steel 12Cr2Mo
1.15 for steel 14CrMo and 1.10 for steel 15CrMo
adjusting the immersion nozzle insertion depth from original 170-180 mm to 140-150 mm
and using lower viscosity mold powder (basicity 1.25
viscosity 0.129 at 1300℃) to increase the flux flowability
the casting slab surface longitudinal cracks defect is effectively controlled
the longitudinal cracks occurred rate decreases from original 8.9% to 3.2% after optimization.