... CE 3National steel structure class A 4Oversea engineering qualification High Quality Steel Building with CEWelcome to HONGYUAN www.sd- ... Z-shape purlin, shoring, cross bracing, tie-bar, intercolumniation, sandwich panels, glass wool panels, High-strength bolts and other ... line2. Reasonable and strict processing flow.3. Strict quality inspection five inspection procedures(ISO CE )4. Special competence ...