| 摘要 |
A high-formability and super-strength hot galvanizing steel plate. The weight percentage of its chemical components: C: 0.15-0.25wt%, Si: 1.00-2.00wt%, Mn: 1.50-3.00wt%, P=0.015wt%, S=0.012wt%, Al: 0.03-0.06wt%, N=0.008wt%, and the rest are Fe and inevitable impurities. The microstructure of the steel plate at room temperature is the ferrite of 10-30%, the martensite of 60-80% and the retained austenite of 5-15%; and the yield strength of 600-900 MPa, the tensile strength of 980-1200 MPa, and the elongation of 15-22%. Through proper involved components, a super-strength cool-rolled hot galvanizing steel plate is produced by continuous annealing, without adding any expensive alloying element. By only properly improving the content of Si and Mn and combining proper annealing and furnace atmosphere control processes, the strength of the steel plate can improve substantially, and the plasticity is also desirable. Meanwhile, the galvanizing quality of the steel plate is good, and the use requirement of an automotive cool-rolled and super-strength hot galvanizing steel can be satisfied. |
