... bar in accordance with a certain spacing and cross-arranged and welded into the middle of a square ... StandardASTM A36, A1011, A569, Q235Grating ProductsSteel Grating, plain and serrated grating, trench grate, stair treadGrating Surface:Hot dip ... platform, flooring and walkway, trench cover, stair tread contact personMichelle Gao electro and hot-dipped Galvanized steel grating for furance platform ...