... standards:GB5099,DOT-3AA,EN1964-1,ISO9809,Q/JB Seamless steel cylinder’s has reliable quality ,clear stamping, ... 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, 30CrMo, 34CrMo2) Outside diameter: 108-356mm3) Water ... aplly in the different steel cylinders 37Mn seamless steel cylinder