... EN carbon steel,stainless steel,alloy steel,Aluminum steel Description of Cap:Production NameASTM A234 WPB Carbon Steel Cap,pipe fitting large diameter ,ansi ... SP-25, MSS SP-75, BS1387Raw materialCarbon steel , stainless steel, alloy steelCarbon Steel 10# 20# Q235B ASTM A234 ASTM A105 ... station, shipbuilding,onshore platform ASTM A234 WPB Carbon Steel Cap,pipe fitting large diameter ,ansi b16.9 bw