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日本住友金属有限公司所属和歌山制铁所的2号大钢坯连铸机是生产品种广泛,尺寸变化的高级棒材坯料和无缝钢管坯料设备。在开坯轧制时的压下比较小的情况下,钢坯中心疏松没有压合而残留在钢坯轴心处,成为UST不良的原因之一。为此,开发控制铸坯阶段的中心疏松技术是非常重要的。为使在铸坯阶段中心疏松压合,而进行了在连铸机内用拉拔矫正带(紧压轧辊带)和在钢液凝固末期进行轻压下试验。实施紧压轧辊带,凝固末期轻压下试验是通过改变注入速度和紧压轧辊带的压力来探讨合适的压合条件。试验证明,注入速度在0.4m/min以上,
Japan’s Sumitomo Metal Co., Ltd. owned Wakayama Iron & Steel’s No. 2 large billet continuous casting machine is the production of a wide range of sizes of advanced bar stock and seamless steel pipe billet equipment. When the reduction in the bloom rolling is relatively small, the center of the billet becomes loose and does not press and remains at the center of the billet, which is one of the causes of the UST failure. For this reason, it is very important to develop a center loosening technology to control the slab phase. In order to loosely press the center of the slab stage, a straightening tape (nip) was used in the continuous casting machine and a soft reduction test was carried out at the end of the solidification of molten steel. The implementation of the squeeze roll, the end of the solidification light pressure test by changing the injection speed and squeeze the pressure roller to explore the appropriate pressure conditions. Test proved that the injection rate of 0.4m / min or more,