Steel Pipes, Pipes Fittings, Socket Fittings manufacturer / supplier in China, offering JIS F7806 Ss400 Type Kab Carbon Steel Square Flange, Carbon Steel 4 Bolt Type Sha JIS 2291 Ss400 Square Flange, A350 Lf2 Carbon Steel 4 Bolt Square Flange, Hydraulic Square Flange and so on.