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采用双辊薄带铸轧机制备出磷含量(质量分数,%)为0.15%的新型高磷耐候钢薄带。对比研究了常规薄带和铸轧薄带冷轧退火后的组织、深拉伸性能,并通过对常规薄带和铸轧薄带中心层织构演变规律的分析探讨了冷轧退火后的铸轧薄带深拉伸性能较好的原因。结果表明,在设定的工艺条件下冷轧退火后,铸轧薄带和常规薄带的组织均为铁素体和珠光体组成的平衡态组织,铸轧薄带纵断面上晶粒取向分布更均匀;常规薄带和铸轧薄带中γ取向线强度相当,导致塑性应变比r值相当,而铸轧薄带中{111}<110>织构强度比常规薄带降低50%导致Δr大幅减小,提高了深拉伸性能。
A new high-phosphorus weathering steel strip with 0.15% phosphorus content (mass fraction) was prepared by twin-roll strip casting and rolling mill. The microstructures and deep tensile properties of cold-rolled and annealed ribbons were compared and studied. The microstructure evolution of the conventional ribbons and cast strip was discussed. The reasons for the better tensile properties of the thin strip. The results show that the microstructures of the cast strip and the conventional strip are all the equilibrium states of ferrite and pearlite after the cold rolling and annealing under the set process conditions. The grain orientation distribution More uniform. The strength of γ-orientation lines in conventional ribbons and cast strip is comparable, resulting in a plastic strain ratio equivalent to r, whereas the texture strength of {111} <110> in the cast strip is reduced by 50% Substantial reduction, improve the deep tensile properties.