30CrMo,37Mn,8-35Mpa in working pressure, 0.4-120L in water liter. Manufacturing standards:GB5099,DOT-3AA,EN1964-1,ISO9809,Q/JB Seamless steel cylinder’s has reliable quality ,clear stamping, consistent height and elegant appearance. Our suppliers can produce large, medium, small sizes high pressure seamless cylinders which range from 8-35Mpa in working pressure, 0.4-120L in water liter.1) 37Mn, ...