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首页> 外文期刊>ISIJ international >Effect of Feeding Modes of Molten Steel on the Mould Metallurgical Behavior for Round Bloom Casting
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Effect of Feeding Modes of Molten Steel on the Mould Metallurgical Behavior for Round Bloom Casting

机译：钢水送料方式对圆坯大方坯铸型冶金行为的影响

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Three kinds of modes for molten steel delivery have been studied in the paper for better understanding of their mould metallurgical effects during round bloom casting. The melt flow, free surface fluctuation, temperature field and solidification behavior in the mould region have been numerically analyzed upon the respective adoption of conventional straight single SEN, quad-furcated SEN with outlets in radial direction and a new type of quad-furcated SEN with outlets at tangential direction. For the latter, a strong horizontal swirling flow has been observed along with the upper and lower recirculation region in the mould. It is shown that the horizontal swirling flow in the mould can reduce the impingement depth of molten steel remarkably, inhibit the mould level fluctuation, and create an active bulk flow below the meniscus, which can also move the hot spot upward and promote superheat dissipation of the molten steel. Meanwhile, the temperature of molten steel near the free surface can be increased by 2.6 K to 4.4 K as compared with the two other normal nozzles. Moreover, compared with quad-furcated SEN with outlets in radial direction, the jet impingement on shell is much weaker, while the thickness of solidified shell at the cross-section of the mould is more even. Furthermore, the shell thickness at exit of the mould under the new type of SEN can reach approximately 18.6 mm, while that under quad-furcated SEN with outlets at radial direction is about 17.4 mm, which leave much allowance for the speed enhancement of present round bloom castings.
机译：为了更好地了解它们在圆坯大方坯铸造过程中的结晶冶金效应，本文研究了三种钢水输送方式。通过分别采用传统的直型单SEN，径向出口的四叉SEN和新型的带有四孔的SEN的数值分析，对模具区域中的熔体流动，自由表面波动，温度场和凝固行为进行了数值分析。切线方向的出口。对于后者，已经观察到强烈的水平涡流以及模具中的上部和下部再循环区域。结果表明，结晶器内的水平旋流可以显着减小钢水的冲击深度，抑制结晶器液面的波动，并在弯月面下方产生有效的整体流，这也可以使热点向上移动并促进合金的过热散发。钢水。同时，与其他两个普通喷嘴相比，自由表面附近的钢水温度可以提高2.6 K至4.4K。而且，与径向出口的四叉式SEN相比，射流对壳体的冲击要弱得多，而在模具截面处凝固的壳体的厚度则更均匀。此外，在新型SEN下，模具出口处的壳厚度可以达到约18.6 mm，而在径向出口处的四叉SEN下，其出口壳厚度为约17.4 mm，这为当前轮的速度提高留了很多余地大方坯铸件。

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