... Channel Ultrasonic Flow Detecting Line for Steel Cylinder1Test channel: 16 channel Range: 0 to 9999 mm, at steel velocity Material ... ≤300Kg3. Product length; 700-2000mm(designed reference)4. Product material; 30CrMo,35CrMo,34CrMo4,37Mn5. Cylinder wall thickness; 4mm-14mm6. ... interlayer, etc. of cylinder’s internal wall resulted by raw material, flow spinning, and heat treatment, etc.8. Couplant : ...