成泽伟, 王永胜, 阮强, et al. Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process[J]. Special Steel, 2010, 31(3): 24-26.
成泽伟, 王永胜, 阮强, et al. Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process[J]. Special Steel, 2010, 31(3): 24-26.DOI:
The longitudinal surface crack of 68 mm x 1 600 mm casting slab of Q235B steel (0. 18% C) and Q345B sleel (0. 17%C) produced by CSP process at Jiuquan Steel mainly occurred at first slab between heats with width of crack 0. 01 -0. 30 mm
depth 0. 10 mm and length ≥50 mm. The results by analyzing the influence factors on longitudinal crack show that as [ S] ≥ 008%
overheating temperature of liquid steel 340°
mold taper ≤4 mm
lower basicity and viscosity of mold powder and thickness of mold copper plat ≤12 mm
the crack index of slab obviously increases. With controlling [S] ≤0. 008%
overheating temperature of liquid steel 30 ±5 ℃
fluctuation of liquid surface in mold + 3 mm
the occurred rate of crack for Q235B steel decreases to 0. 36% from original 2%
and for Q345B steel decreases to 0. 98% from original 5% .