Product Details

Commodity name: small wall thickness diviation cold drawn preicision telescopic pipe

1.Grade: 20#(aisi1020,ck20),45#(ck45,aisi1045),st52(16Mn,Q345D),25Mn,27SiMn,42CrMO

2.ID:30-250mm

3.ID tolerance:H8,H9

4.Surface roughness:Ra 0.02— 0.4μm

5. Final supply condition:cold drawn and stress-relieved(BK+S

6. Machining allowance:0.5-1.5mm

7.Wall thickness:10%×ID

Variety

Processing

Cylinder Diameter

Straightness

Size Accuracy

W.T/mm

Inner Bore Roughess

Cold drawn/

cold rolled

ID30-250

0.3

H9-H11

±10%

0.4~1.6um

Honed tube

ID50-250

0.3

H7-H9

±10%

<0.4um

Mechanics performance

Material	Tensile strength	Yield strength	Elongation	Hardness
Ck20/20#/AISI1020	>520 N/ mm²	>375 N/mm2	>15%	>85HB
Ck45/45#/AISI1045	>600 N/ mm²	>520 N/ mm²	>15%	>85HB
ST52/16Mn/Q345D	>600 N/ mm²	>520 N/ mm²	>15%	>85HB
25Mn/STKM 13C-T	>600 N/ mm²	>530 N/ mm²	>15%	>85HB

Dimension tolerance

ID size

ID deviation (mm)

H10

+0.021

+0.033

+0.052

+0.084

>30~50

+0.025

+0.039

+0.062

+0.100

>50~80

+0.030

+0.046

+0.074

+0.120

>80~120

+0.035

+0.054

+0.087

+0.140

>120~180

+0.040

+0.063

+0.100

+0.160

>180~250

+0.046

+0.072

+0.115

+0.185

>250~315

+0.052

+0.081

+0.130

+0.210

>315~400

+0.0527

+0.089

+0.140

+0.230

Delivey conditions

Standard packing with plastic caps and strapped bundles.
Commercial length 2000~10500mm,custom lengths upon request
Surface protection

We can supply cold drawn steel pipe,honed tube,hydraulic pipe,hydraulic cylinder tube.

Pretreatment : Acid cleaning- Parkerizing

Cold drawn/cold rolled

Annealing furnace—— stress-relieving (+SR)

Straightener—— Straightening/ Leveling

Straightness inspecting

Dimension inspecting

Sawing off not good parts

Lathe

Surface Polishing

Finished Products

Application:

hydraulic cylinder tube st52 din2391 widely used in hydraulic system with precision steel tube, injection molding machine with precision steel tube, hydraulic press with precision steel tube, shipbuilding with steel tube, EVA foaming, hydraulic machinery, hydraulic cutting machine, shoe making machinery, hydraulic equipment, high pressure tubing, hydraulic tubing, card sets of joints, pipe joints, rubber machinery, forging machinery, casting machinery, engineering machinery, automotive high pressure steel pipe concrete pump, sanitation vehicle, automobile industry, shipbuilding industry, metal processing, military industry, diesel engine, the internal combustion engine, air compressor, construction machinery, forestry machinery, etc.

Any Need or request , please feel free to contact us !