节镍型奥氏体钢板热轧分层分析及改进措施

Analysis and Improvement Measures of Hot Rolling Delamination of Nickel Saving Austenitic Steel Plate

摘要: 通过光学显微镜、扫描电镜和能谱仪等手段对钢带1/2处进行分析，研究钢板分层的原因及预防措施。结果表明：钢带出现严重的中心偏析和较多夹杂物，而轧制后应力集中在板厚中心处，在后续热处理过程中，应力集中释放，造成钢板分层。通过改进连铸设备和工艺、优化连铸二冷水等措施，使钢板的中心分层现象得到明显改善。

Abstract: Optical microscope, scanning electron microscope and energy dispersive spectrometer were used to study the region of half of slab to explore the causes and preventive measures of steel plate delamination. The results show that there are serious central segregation and lots of inclusions in the steel strip, and the stress is concentrated in the center of the plate thickness after rolling. In the subsequent heat treatment process, the stress is concentrated and released, resulting in the delamination of the steel plate. By improving the equipment and process of continuous casting and optimizing the secondary cooling water, the central delamination of steel plate has been significantly improved.