Honed Tube

Honed tube is the raw material for manufacturing hydraulic and pneumatic cylinder barrels. Base material is cold‑drawn seamless steel tube, inner bore finished by two mainstream processes: honing and SRB skived & roller burnished.
 ✅ Honing Process Inner bore is finished by abrasive honing stones, forming cross‑hatch oil‑retaining texture. Cost‑effective solution for general‑purpose hydraulic cylinders.
 ✅ SRB Skived & Roller Burnished Process Skiving removes material allowance then roller burnishing compresses inner surface. Better surface density and finish, preferred for heavy‑duty high‑pressure working conditions with higher cost.

 Key technical parameters: 

Inner diameter tolerance: H7, H8, H9 (H8 & H9 widely adopted for cylinder application)
Inner surface roughness: standard Ra ≤0.4μm, high‑precision option Ra ≤0.2μm Good straightness, roundness and cylindricity to avoid piston jamming and seal premature wear.
Available Materials: Carbon steel: 20#, 45# ‑ Alloy steel: 27SiMn, 40Cr, QT quenched & tempered treatment optional for high‑pressure service 

                                  European grade: E355 (ST52) 
Stainless steel: TP304, TP316L for corrosive environment Applicable
Standards:GB/T8713, DIN2391, EN10305‑1 / EN10305‑2, ISO 10204‑3.1 material certification
Size Range:Inner Diameter(ID): 20mm‑400mm Outer Diameter(OD): 42mm‑480mm
Wall Thickness(WT): 4mm‑50mm Standard length 4‑8m, custom fixed‑lengthcutting available. 

Applications: •

Hydraulic cylinder barrel blank for construction machinery, 

forklift, sanitation equipment 

Pneumatic cylinder tube manufacturing 

Mining, injection‑molding machine and heavy‑duty hydraulic equipment

Optional Service: 

Stress‑relief annealing,

QT quenched‑tempered treatment, 

inner anti‑rust oil, 

plastic end caps for bore protection,

seaworthy steel bundle export packing. 

Third‑party inspection like SGS is acceptable.