Grade 550 steel: high strength, strong firmness, good rain resistance, consistent rolling,good corrosion resistance Grade 550 steel: StandardASTM, DIN, GB, JISGradedx51dThickness0.14mm-1 ... bending 0-1T, the top paint 25um.Our products are high quality with proper price, received clients appreciations all around the ... over the globe cooperate with us. ASTM, DIN, GB, JIS Grade 550 steel