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Torich International Co.,Ltd.
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You are here: home  > Hydraulic Steel Tube  > DIN2391 hydraulic steel tube  > High PrecisionSteel Pipes with Black Phosphating for Hydraulic Systems

High PrecisionSteel Pipes with Black Phosphating for Hydraulic Systems 

Payment Terms: T/T,L/C 
Place of Origin: Zhejiang, China (Mainland) 
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Product Detail

Means of Transport: Ocean
Packing: wooden packing
Production Capacity: 2000
Delivery Date: 60 days

DIN2391 St37.4 NBK
Phosphate Seamless.
Hydraulic Systems,
Cylinder Steel Tubes

DIN2391 St35.0 St37.0 St44.0 St45St52.0 BKW BKS GBK NBK Seamless Precision Cold Drawn Steel Tubes


Standard: DIN2391 Seamless Cold Drawn/Rolling Steel Tubes

Applications: for Auto industry / for machinery use / Oil Cylinder Tube / Motorcyle shock absorber

Auto shock absorber innder cylinder / Telescopic Cylinders            

Size range: O.D.:6-350mm     W.T.:1-50mm      L:max12000mm     



The tubes are manufactured from electric steel or basic oxygenn stel, the melting and casting processes being at the discretion of the manufacturer.

The steel is cast as kiiled steel             



Tubes have a smooth internal and external surface with the cold working process


Tube ends:

Square cut, no burrs                   

Steel Grade and Chemical Compositions:

Steel GradeCSiMnPS
ST350.17 0.35≥0.400.0250.025


Mechanical properties at room temperature
Steel GradeMinimum values for the delivery condition

Note: Special steel grade is also available, according to customer request.


Final Supply Condition:

BK - Cold finish (hard)      

Tubes do not undergo heat treatment following the final cold forming and, thus

have a rather high resistance to deformation


BKW - Cold finished(soft)  

The final heat treatment is followe by cold drawing involving limited deformation.

Appropriate further processing allow a certain degree of cold forming (bending, 



BKS - Cold finished and stress-relieved

Heat treatment is applied following the last cold forming process. Subject to appropraite processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.


GKB - Annealed

The last cold forming process is followed by annealing in a controlled atmosphere.


NBK - Normalized

The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.




1. dimensional chec

2. surface inspection

3. tensile test as DIN EN10002 Part 1

4. flattening test, as DIN EN10233

5. drift expanding test as DIN EN10234

Mr. Richard
skype Mr. Richard
Managing Director
Tel: 86-574-88255925
Fax: 86-574-88086983
Mobile: 137 3616 4628
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Company Info

Torich International Co.,Ltd. [China (Mainland)]

Business Type:Manufacturer, Trading Company
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)

Sales:   skype

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