Industrial trial on Ferrite Rolling of IF Steel in Hansteel 2250 Hot Continuous Rolling Mill
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摘要: 为了实现汽车板热轧工序的节能创效,河钢邯钢依托2250热连轧产线开展超低碳IF钢铁素体轧制工业试制,分别对热板显微组织、力学性能及连退成品显微组织、力学性能、织构等进行对比分析。结果显示:DC06铁素体轧制热板显微组织为非再结晶轧制态组织,奥氏体轧制热板显微组织为典型再结晶多边形铁素体;DC06铁素体轧制热板屈服强度Rp0.2和抗拉强度Rm较奥氏体轧制有所提高且波动范围大,断后延伸率A降低约10%;铁素体轧制工艺连退成品DC06显微组织均匀、晶粒尺寸较奥氏体轧制更加细小;其塑性应变比r值相对较低、各向异性更明显;奥氏体轧制工艺{111}面织构比铁素体轧制工艺强烈,更有利于冲压成型。Abstract: In order to save energy and improve efficiency during hot rolling automobile steel sheet,Handan Company,HBIS Group carried out the industry trial production of ferrite rolling of ultra-low carbon IF steel relying on a production line of 2250 hot continuous rolling.The microstructure,mechanical properties of hot coiled strip,microstructure,mechanical properties and texture of the continuous annealing products were compared and analyzed.The results show that the microstructure of hot strip steel under ferrite rolling did not recrystallize,and the microstructure of hot strip under austenite rolling is composed of typical recrystallized polygonal ferrite.The yield strength Rp0.2 and tensile strength Rm of DC06 steel under ferrite rolling are higher than those of austenite rolling,and the fluctuation range is larger,and the elongation after fracture is reduced by about 10%.The microstructure of DC06 of ferrite rolling process is uniform,and the grain size is finer than that of austenite rolling,and its plastic strain ratio is relatively low and anisotropy is more obvious.The {111} texture of strip under austenite rolling process is stronger than that of ferrite rolling process,which is more favorable for stamping forming.
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Key words:
- IF steel /
- ferrite rolling /
- microstructure /
- performance /
- r value /
- texture
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