Ekaship can supply high pressure cylinder pipe of various types. We have standards of GB 18248, GB 28884, ASTM A519, JIS G3429, Q/TGGB31, and EN 10297-1. Steel grades such as 4130, 4130X, 4142, 4145, 4147, 4137, 4140, 37Mn, 34Mn2V, 30CrMo, and etc. If you have any demands on them, feel free to contact us by-sales@ekahsip.com.