cylinder tube, o.d.232mm-406mm, w.t.4.2mm-5.6mm. Material: 30CrMo, 35CrMo, 34CrMo4, 34Mn2V. Length: 3-10.5m. cylinder tube:MaterialC%Rm ,MPaReL ,MPaA ,External diametermmWall-thickness/mmNon straightnessLength/mRoundness30CrMo0.26/0.34≥910≥765≥12232±0.75% 273±0.75% 325±0.75% 356±0.75% 406±0.75%4.2,+15%,-04.8,+15%,-05.0, +15%,-05.6, +15%,-01.5mm/M3-10.5 ≤0.5%diameter35CrMo0.32/0.40≥960≥825≥ ...