type 2 cylinder tube, o.d.232mm-406mm, w.t.4.2mm-5. ... . Material: 30CrMo, 35CrMo, 34CrMo4, 34Mn2V. Length: 3-10.5m. type 2 cylinder tube: MaterialC%Rm ,MPa ReL ,MPa A , External diametermmWall-thickness ... % 325±0.75% 356±0.75% 406±0.75% 4.2,+15%,-04.8,+15%,-05.0, +15%,-05.6, +15 ... .020P+S≤0.030.Thermal treatment: quenching and tempering type 2 cylinder tube