SO Flange RF,12",300#,ASTM A105/ANSI B16.5 1.Standard ... /alloy/Aluminum steel Description of Flange: Production NameSO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/ ... 28, DIN , ISO, EN,JIS,MSS SP, BSCarbon Steel 10# 20# Q235B A234 A105 A403Stainless Steel 1Cr18Ni9Ti 0Cr18Ni9 00Cr19Ni10 304 ... is our pursuit daisy(at)dingshengsteel.com SO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/