... 3National steel structure class A 4Oversea engineering qualification High Quality Steel Building with CEWelcome to HONGYUAN www.sd ... shape purlin, shoring, cross bracing, tie-bar, intercolumniation, sandwich panels, glass wool panels, High-strength bolts and other ... check.High-class Efficiency 1. Processing capacity two large-scale manufacturing workshop.& design2. Material supply rapidness, smooth, ...