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Microstructures and properties of phosphorus- containing high strength cold rolled and annealed IF steels

On industrial scale, high strength P- containing IF (Interstitial Free) steels were produced with both batch annealing and continuous annealing processes and their microstructures and properties were studied. Forming abilities of the two steels were compared with commercial Al- killed steel DC01 and extreme deep drawing IF steel DC04 produced with batch annealing. The results show that the microstructures of high strength IF steels are composed of equi- axial ferrite and their mechanical properties meet the requirement of relevant standard. The batch annealed high strength P- containing steels show poorer formability than continuous annealed ones. The test results of texture and orientation distribution function (ODF) demonstrate that density of ??- fiber increases in order of batch annealed high strength P- containing IF steel, commercial DC01, continuous annealed high strength P- containing IF steel and normal IF steel DC04.