... St 55-3, St 55-3U, St 55-3N steel plate, St 55-3, St 55-3U, St 55-3N steel price, St 55-3, St 55-3U, St ... standard: DIN17100 Steel grade: DIN17100 St 55-3, St 55-3U, St 55-3N St 55-3, St 55-3U, St 55-3N steel Dimension: Thickness ... Nb:0.02—0.04 Al:0.02 N:0.009 St 55-3U C: 0.20% Mn: 1.60% P: 0 ...