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首页> 外文期刊>ISIJ international >Influence of Soft Reduction on the Fluid Flow, Porosity and Center Segregation in CC High Carbon- and Stainless Steel Blooms
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Influence of Soft Reduction on the Fluid Flow, Porosity and Center Segregation in CC High Carbon- and Stainless Steel Blooms

机译：软还原对CC高碳高碳钢和不锈钢大块坯中流体流动，孔隙率和中心偏析的影响

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摘要

Mechanical soft reduction, MSR, is today an established technique for reducing center segregation and center porosity in the continuous casting of blooms. The bloom cross section is reduced by pinch rollers to compensate for the downward liquid flow in the mushy zone due to solidification shrinkage. In the literature, results are reported on how much MSR quantitatively affects the center segregation, but not on how it influences the liquid flow velocities.An analytical mathematical model has been developed to calculate the liquid flow velocity along the strand taking into account the effect of height reduction at each pinch roller and the solidification shrinkage. The model considers how much of the total area reduction contributes to an area reduction of the liquid in the center and thus how it affects the flow velocities. The model is easy to apply and brings deeper understanding of the effect of MSR. Calculated results from different scenarios show that the area reduction should increase closer to the crater end. MSR trials on a high carbon steel grade show that the center segregation decreases in proportion to the amount of reduction and clarify the importance of applying a pinch roller just before the crater end. Elongations of the strand above ~1% gave inner cracks in this case. MSR of only 2% height reduction on a stainless steel bloom, type AISI 316, gave a substantial closure of visual center porosity on inspected longitudinal samples.
机译：如今，机械软压下MSR是减少大方坯连铸过程中中心偏析和中心孔隙率的一项成熟技术。通过压紧辊减小大方坯的横截面，以补偿由于凝固收缩而在糊状区域中向下的液体流动。在文献中，报道了有关MSR定量影响中心偏析的结果，但没有影响其对液体流速的影响。每个压紧辊的高度减小和凝固收缩。该模型考虑了总面积减少的多少有助于中心液体的面积减少，从而影响了流速。该模型易于应用，并且可以更深入地了解MSR的效果。不同情况下的计算结果表明，减少的面积应在靠近火山口的地方增加。在高碳钢等级上的MSR试验表明，中心偏析与减少量成正比，并阐明了在压坑末端之前使用压紧辊的重要性。在这种情况下，股线的伸长率超过〜1％时会产生内部裂纹。在AISI 316型不锈钢大方坯上，MSR仅降低了2％的高度，从而使被检查的纵向样品的视觉中心孔隙率大大降低。

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