据日刊《铁与钢》报道新日铁大分厂在进行高速连铸之初,发现铸坯中心裂纹增多,而该裂纹在轧制中不能焊合,是钢板分层或超声波探伤(下称UST)不合格而报废的重要原因,故对之了深入研究。 铸坯横断面中心部位的线状裂纹谓之中心裂纹。对铸坯的UST检测表明,缺陷(近90％为间断式岛状缺陷)严重的,中心裂纹发 According to the journal “Iron and Steel,” Nippon Steel Branch at the beginning of the high-speed casting at the beginning and found that the center of the slab cracks increased, and the crack can not be welded in the rolling, the steel stratification or ultrasonic flaw detection (hereinafter UST ) Unqualified and scrapped the important reason, so the in-depth study. The center of the slab cross-section of the center of the linear cracks that the center of the crack. The UST test on cast slabs showed that the defects (nearly 90% discontinuous island defects) were severe with central crack