we manufacture pneumatic cylinder tube high quality with good price 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 ... .020P+S≤0.030.Thermal treatment: quenching and tempering cylinder tube