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Precision Seamless Steel Tube/Pipe

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Cold Drawn Seamless Honed Tubes for Hydraulic Cylinder manufacturing Material

Honing is a kind of machining technology. Through honing head, the inner hole of cold drawn pipe is processed by reciprocating high-speed grinding technology, so that the inner hole can meet the requirements of tolerance size and surface roughness that we need. Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder. 

Detailed Parameters


Size range: 

OD:10mm-426mm

WT:1mm-40mm

 

Available steel grade: 

SAE/AISI: 

SAE1020, SAE1026, SAE1045, SAE4130, SAE4140

DIN: 

ST52, ST52.3, ST52.4

EN: 

E355, C45E, 25CrMo4, 42CrMo4, CK45, S45C, E410, E470

GB: 

20#, 45#, 16Mn, Q345B, Q345C, Q345D, Q345E, 25Mn, 27SiMn, 

 

Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring

 

Delivery condition: 

BK

BKW

BKS

GBK

NBK

Q+T

+C

+LC

+SR

+A

+N

Cold rolled

Cold drawn

Stress relieved

Annealed

Normalized

Quenched+Tempered

 

Bore treatment: Honing, skiving&roller burnishing

 

Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes. 

 

End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes. 

 

Standard export packing: In bundles tied with steel strips. Internal & external oil coating. Plastic caps on both ends. External packing by PVC bags and knit bags. 

 

Customized packing and marking can be provided upon request. 

 

H8 tolerance: 

OD range

Tolerance

OD range

Tolerance

10< d ≤30

+0/+0.033

180< d ≤250

+0/+0.072

30< d ≤50

+0/+0.039

250< d ≤300

+0/+0.081

50< d ≤80

+0/+0.046

300< d ≤315

+0/+0.081

80< d ≤120

+0/+0.054

315< d ≤400

+0/+0.089

120< d ≤180

+0/+0.063

400< d ≤426

+0/+0.097


Difference between honed tube and skived & roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness. 

 

Application: They are widely used in wind power generation, engineering machinery, hydraulic cylinder, automotive, hydraulic shock absorption system, excavation and mining machines etc.



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