Hydraulic Telescopic Cylinder

Instruction

Production Method:
TORICH is hydraulic honed pipes manufacturer from China, which is a professional supplier for hydraulic honed tube for Hydraulic Telescopic Cylinder, focusing on quality, service and customer satisfaction to win a fame among hydraulic honed tube suppliers and hydraulic honed tubes manufacturer in China.
Honed Tube is also called honing tube, is usually produced by ID Honed process based on Precision Seamless Steel Tube as raw material, production method can be ID Honed or Skiving Roller Burnished.

TORICH hydraulic honed tubes is usually based on Cold Drawn Hydraulic Cylinder Tube according to EN10305-1 E355 SRA, ID finished by SRB or Honing, OD chromeplated

 

Chemical Composition Analysis

C %	Si%	Mn%	P%	S%	C.E%
0.19	0.31	1.44	0.014	0.02	0.43

 

Mechanical Properties:

Size	Yield Strength ReH N/mm²	PSI	Tensile Strength Rm N/mm²	Elongation A5%
All diameter	≥520	≥75000	≥520	Min15%

 

Equivalent Steel for E355

EN	DIN	AFNOR	SAE/ASTM	Chinese
E355	ST52-3	E36-4	1024	Q345B/Q345D

 

Heat Treatment:
The tubes are delivered in stress and relieved conditions(+SR).
Other heat treatment requirement is available for negotiation.

Chrome Layer:
Diameter ＞20mm, the chrome layer is 20μm min,for smaller sizes the minimum thickness is 15μm.

Surface Roughness:
The surface roughness (Ra) is less than 0.2μm and normally in the average of 0.05-0.15μm, the Rt is less than 2.0μm and with an average of 0.5-1.5μm.

Inside Surface Roughness:
The inside roughness (Ra) for skived and roller burnish tubes is less than 0.25μm.
For honed tubes the inside surface roughness is less than 0.6μm

Surface Hardness:
The chrome layer hardness is 900 HV 0.1min

Straightness:
The diameter ＜30mm, the max deviation is less than 0.5/1000mm.
The max deviation for lager diameter is 0.3/1000mm.
Can consult and discuss with our team if special request is needed by customer.

Roundness:
The roundness us max 50% of the diameter tolerance range.

Diameter Tolerance:
ISO-f7 standard.
Other tolerance can be supplied by customers’ specific request.

Eccentricity:
The eccentricity is max ±10% of the WT according to the standard EN10305-1, the aim is to meet the max of ±7.5% of the Wall Thickness (WT)

Production Process for Hydraulic Telescopic Cylinder:
Cold Drawn or Hot Rolled Seamless Steel Tubes →
Cold Drawing/Cold Rolling  →
Heat Treatment Annealing/Bright Annealing → (Repeat)
ID Honing or ID Roller Burnish → (Repeat) to final dimensional tolerances and ID roughness
Induction Hardened → Chrome Plating →
Final inspection → Ready to Ship

 

Tolerances from ISO286 for H8 in μm

ID mm	Upper	Lower
40-50	39	0
＞50-80	46	0
＞80-120	54	0
＞120-180	63	0
＞180-250	72	0
＞250	Consult our sales team

 

Tolerances from ISO286 for f7 in μm

ID mm	Upper	Lower
Upto 18	-16	-34
＞18-30	-20	-41
＞30-50	-25	-50
＞50-80	-30	-60
＞80-120	-36	-71
＞120-180	-43	-83
＞180-250	-50	-96
＞250	Consult our sales team

 

Delivery Length:
Production capability for length is 3.0-10 m.
Cutting to short length is achievable by customer’s specific requirement.

 

Workshop for hydraulic honed tubes:

Products Show from mass production:

Inspection and Testing:

Delivery and Packing: