... hot rolled carbon round steel 1Factory direct price 2Small order&customize 3Fast delivery time Structual steel high quality hot rolled carbon ... round steel(Q235 Q345 SS400 S235JR S275JR S355JR....manufacture,customize)specificationOuter Diameter:3.5mm-300mmStandardGB,JIS,DIN,AISI,ASTMCertificateISO9001-2008 ...