Size:1/2'' - 72'' Standard:ASTM A105, ANSI B16.5/B16.47/B16.48,JIS B1503/B2220, ... DIN 2573/2527/2631 Certificate:ISO 9001, SGS Specification TypeASTM A105 Carbon steel flanges Pipe Size1/2"—72" Pressure150# ,300#, 600 ... Honry Steel Pipe Co.,LtdContact:echo sales @ honrypipe.com ASTM A105 Carbon steel flanges