High quality steel bar round steel 1.Factory direct price 2.Free sample&small ... is ok 3.Size:6.5mm-300mm Carbon round steel bar for constructionspecificationOuter Diameter:3.5mm-300mmStandardGB,JIS,DIN,AISI,ASTMCertificateISO9001 ... ,Q235,10#,20#,45#,,St37-2,S355JR, etc.ApplicationA) General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and nuclear ...