MR It contains few residual minor constituents and has a good corrosion resistance, so that it is widely used for such application as containers. L It contains particularly few residual minor constituents such as Cu, Ni, Cr, Mo, so that it is suitable for the material of containers which require improved corrosion resistance. D It is aluminum killed steel , so that it is suitable for the application which bear deep drawing or other working that is liable to produce Luder's lines.