Effect of Soluble Al Content on the Microstructure and Property of Batch Annealed Ti‐If Steels

As an important deoxidizer in steelmaking, the Aluminum in low carbon Aluminum-killed steel has a significant influence on the steel inclusion number and finished product property. In this paper, the influence of soluble (free) Aluminum content (in the range between 50ppm and 550ppm) on the property of final product of batch annealed Ti-IF steel is investigated on an industrial scale. Uniaxial tensile testing and optical microstructure observation were conducted. It was found that apart from the yield strength, the variation of Al content within the above range does not have any remarkable influence on other mechanical property. The microstructure shows equiaxed morphology regardless of the soluble Aluminum content. And the grain size was all graded within the range between 9.0 and 9.5. The final product shows no variation of mechanical property and formability according to the soluble Al content.