马氏体不锈钢板坯连铸保护渣研制与应用

 由于钢种特点，连铸马氏体不锈钢板坯容易产生裂纹缺陷，影响生产节奏和修磨效率；同时，由于采用通用型保护渣，也无法针对马氏体不锈钢板坯质量问题做出进一步改进。因此，尝试马氏体不锈钢板坯连铸保护渣的国产化研制和使用，通过保护渣碱度、CaF等的不同范围与保护渣结晶、黏度性能的关系研究，确定采用高碱度、低黏度、高结晶性的保护渣设计原则，并由此得出了适应马氏体不锈钢板坯连铸的保护渣设计方案。实际使用过程中，板坯纵裂率下降幅度达到30%，证明了马氏体不锈钢连铸板坯保护渣设计和研制的合理性和可行性。

Development and Application of Mould Powder for Continuous Casting Slab of Martensitic Stainless Steel

Due to the metallographic characteristics of the martensitic stainless steel,longitudinal crack was easily generated at wide-face and corner of slab during solidification process,which would seriously affect the production and grinding machine operating rate.Meanwhile,the slab quality was not improved owing to general mould flux in martensitic stainless steel.The design principle of mould powder with high basicity,low viscosity and high crystallinity was decided through study the relationship between basicity and CaF content of mould powder and the properties of viscosity and crystallinity.The domestic martensitic stainless steel slab mold flux was developed.As a result,and the degree of longitudinal crack was decreased by 30%.