S235JR is the European standard of non-alloy structural steels, equivalent to GB Q235B, namely carbon structural steels with low carbon, usedfor welding, bolting, and more riveted structure. Q235 quality grades A, B, C, D, E, followed by a poor-quality,e-quality is highest.Deoxidization method symbol for the F, b, z, TZ,representing steel,half-killed steel,steel and special steel,designation, TZ and Z symbol can be omitted. Q235A, Q235B, Q235C, Q235D, Q235E representation of the different levels, primarily impact of temperature difference. http://www.sellsteels.com/steel-plate/S235JR.html
