... fine de fine steel (P less than 0.035 percent,S less th less thaless than 0.030 percen; percent) ... , the separation angtion angle should be no less than 45 degrees between cross rib and steel bar ... polished before bending. The grad distance must be less than 110mm by any gate, railing, staircase, handrail ... iron of hot galvanize technology is much better than that of cold galvanizing, and hot galvanizing ...