Specifications

1 ID30-250mm
2 ISO certificated DIN2391,En10305
3 Straightness:0.3~1mm/m
4 Inside Roughness:Ra<0.4
20# ready to honed tube

Commodity name: Din2391 Hydraulic Cylinder st52 ready to honed tube

 

1.Grade: 20#(aisi1020,ck20),45#(aisi1045,ck45), st52(16Mn) ,25Mn(STKM13C-T),27SiMn

 

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	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)
	H7	H8	H9	H10
30	+0.021 0	+0.033 0	+0.052 0	+0.084 0
>30~50	+0.025 0	+0.039 0	+0.062 0	+0.100 0
>50~80	+0.030 0	+0.046 0	+0.074 0	+0.120 0
>80~120	+0.035 0	+0.054 0	+0.087 0	+0.140 0
>120~180	+0.040 0	+0.063 0	+0.100 0	+0.160 0
>180~250	+0.046 0	+0.072 0	+0.115 0	+0.185 0
>250~315	+0.052 0	+0.081 0	+0.130 0	+0.210 0
>315~400	+0.0527 0	+0.089 0	+0.140 0	+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 seamless tube,cold rolled seamless pipe.honed tube,hydraulic tube.Please feel free to contact us .

• 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 product