CAP standard:ANSI, DIN,JIS, BS and UNI carbon steel stainless steel and alloy steel cap Pipe CapStandard: Standard: GB /ASTM / ASME / DIN / ... JIS.Material:Carbon steel(10#, 20#, Q235, 20G, 16Mn, ASTM A234, ASTM A105, ST37 ... -2),Stainless steel (TP304, TP304H, TP304LN, TP304L, TP310 / S, TP316L, TP316H, TP316 ...