低Al和高Al两种成分体系合金化热镀锌DP780性能对比
The Comparison of Properties between Low-Al and High-Al Annealed Hot-Dip Galvanizing DP780

针对传统DP780，本文采用Al元素替代部分Cr元素，在相同热轧温度、冷轧压下率、退火温度等生产工艺条件下，完成了低Al与高Al两种成分体系DP780合金化镀锌板生产试制，并对其性能进行了详细对比。结果表明，高Al系DP780与低Al系DP780相比，基体微观组织更加均匀，横纵向性能差异更小，扩孔性能更优，且对合金化镀层无影响。因此，用适量Al元素替代部分Cr元素，不仅可以明显降低成本，还有效提升了DP780综合性能。
For traditional DP780, this paper uses Al el-ement to replace part of Cr element. Under the same production process conditions as hot rolling temperature, cold rolling reduction rate and annealing temperature, the trial production of DP780 annealed galvanized sheet with low Al and high Al component was completed, and its properties were compared in detail. The results show that when comparing high Al series DP780 with low Al series DP780, the matrix microstructure is more uniform, the difference in transverse and longitu-dinal properties is smaller, the hole expansion performance is better, and it has no effect on the al-loyed coating. Therefore, replacing some Cr elements with an appropriate amount of Al elements can not only significantly reduce the cost, but also effectively improve the comprehensive perfor-mance of DP780.