梅钢精冲钢连铸板坯中心偏析控制技术与应用

连铸板坯的中心偏析是造成精冲钢带状组织的重要原因。动态轻压下技术是改善连铸板坯中心偏析的有效手段。本文通过射钉试验,准确测定了230 mm连铸板坯凝固末端的位置,为制定合理的轻压下工艺参数提供了重要参考。在轻压下工艺改进前(9、10段,总压下量7.5 mm),典型精冲钢的板坯中心偏析级别在曼标M2.4以上;通过改进轻压下位置和压下量参数后(8、9段,总压下量10 mm),连铸板坯的中心偏析得到明显改善,板坯低倍偏析曼标控制在M2.0以内,精冲钢用户的带状组织也得到有效控制。

Practice Application for Controlling Technology of Center Segregation of Fine Blanked Steel Continuons Casting Slab at Meigang

Center segregation of continuous casting slab is the main cause to form banding structure in fine blanked steel. Dynamic soft reduction technique is an effective measure to improve the center segregation of continuous casting slab. In this paper,final solidifying end of 230 mm continuous casting slab can be accurately determined by rivet pin shooting experiment improvement of soft reduction process. The center segregation of representative fine blanked steel was beyond M2.4 of Manesman standard before improvement of soft reduction process ( at zone 9 and 10, total reduction 7. 5 mm). The result of rivet pin shooting experiment is the reference of parameter of dynamic soft reduction. With the parameter optimizing of soft reduction (at zone 8 and 9, total reduction 10 mm) , center segregation of continuous casting slab can be controled within M2. 0 of Manesman standard. Banding structure in fine blanked steel can also be controled effectively.