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Torich International Co.,Ltd.
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     

 

Materials:

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             

 

Apperance:

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
maxmax
maxmax
ST350.17 0.35≥0.400.0250.025
ST450.210.35≥0.400.0250.025
ST520.220.35≥1.600.0250.025

 

Mechanical properties at room temperature
Steel GradeMinimum values for the delivery condition
BKWBKSGBK(+N)  NBK
ST3548064201042031514340-47023525
ST455805520852037512440-57023521
ST526404580758042010490-63035522


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, 

expanding)

 

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.

 

 

Testing:

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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