1.mild carbon steel pipe astm a 106 gr.c 2.ASTM A213,A210-C,A179,A192,DIN17175ST37 ... tube2 Production Standard mild carbon steel pipe astm a 106 gr.cASTM SA213, SA335, A369, A209, A250, G3462, G3467, DIN17175 ... , P92 DIN17175: 15Mo3, 13CrMo44, 10CrMo910, 12CrMo195 BS3059: 360, 440, 460, 620 JIS G3458: STPA12, STPA20, STPA22, STPA23, STPA24, STPA25, STPA26 ... pipe mild carbon steel pipe astm a 106 gr.c