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DIN 2391 ST 35 NBK

DIN 2391 ST 35 NBK Cold Drawn Seamless Steel Tube

Product Description

The DIN 2391 ST 35 NBK Cold Drawn Seamless Steel Tube is a high-quality steel tube designed for precision applications requiring seamless, cold-drawn processing. Made from ST 35 steel, it offers excellent strength, toughness, and durability, making it ideal for high-pressure and high-performance hydraulic systems. The NBK (annealed bright) surface finish enhances its corrosion resistance and surface quality, making it suitable for various industrial and automotive applications.

Product Advantages

Materials
  • Steel Grade: ST 35
  • Properties:
  • ST 35: A low-carbon steel known for its good tensile strength and ductility.
  • Excellent forming and welding capabilities, which are essential for high-precision applications.

International Standards

DIN 2391: Standard for precision seamless steel tubes used in hydraulic systems.

 

 

DIN 2391 ST 35 NBK
Dimension

Cold Drawn/Rolled Seamless Precision Steel Tubes Confirming To DIN2391;EN10305-1;EN10305-4

OD Thickness（mm）
mm
6 6*1 6*1.5                  
8 8*1 8*1.5 8*2                
10 10*1 10*1.5 10*2                
12 12*1 12*1.5 12*2 12*2.5              
14 14*1 14*1.5 14*2 14*2.5 14*3            
15 15*1 15*1.5 15*2 15*2.5 15*3            
16 16*1 16*1.5 16*2 16*2.5 16*3            
18   18*1.5 18*2 18*2.5 18*3 18*3.5 18*4        
20   20*1.5 20*2 20*2.5 20*3 20*3.5 20*4        
22   22*1.5 22*2 22*2.5 22*3 22*3.5 22*4        
25     25*2 25*2.5 25*3 25*3.5 25*4        
28     28*2 28*2.5 28*3 28*3.5 28*4        
30     30*2 30*2.5 30*3 30*3.5 30*4 30*4.5 30*5    
32     32*2 32*2.5 32*3 32*3.5 32*4 32*4.5 32*5    
34     34*2 34*2.5 34*3 34*3.5 34*4 34*4.5 34*5 34*6  
35     35*2 35*2.5 35*3 35*3.5 35*4 35*4.5 35*5 35*6  
38     38*2 38*2.5 38*3 38*3.5 38*4 38*4.5 38*5 38*6  
40       40*2.5 40*3 40*3.5 40*4 40*4.5 40*5 40*6  
42       42*2.5 42*3 42*3.5 42*4 42*4.5 42*5 42*6  
45       45*2.5 45*3 45*3.5 45*4 45*4.5 45*5 45*6  
46       46*2.5 46*3 46*3.5 46*4 46*4.5 46*5 46*6  
48       48*2.5 48*3 48*3.5 48*4 48*4.5 48*5 48*6  
50       50*2.5 50*3 50*3.5 50*4 50*4.5 50*5 50*6  
54         54*3 54*3.5 54*4 54*4.5 54*5 54*6  
60         60*3 60*3.5 60*4 60*4.5 60*5 60*6 60*8
Note: 1. We can produce other specification as your requirements.
         2. Surface treatment: Bright, galvanized (yellow, white, colorful), phosphated，army green passivation.

 

Features
  • Seamless Construction: Made from a seamless tube, offering superior strength and uniformity compared to welded alternatives.
  • Cold Drawn: The cold-drawing process improves dimensional accuracy, surface quality, and mechanical properties.
  • NBK (Annealed Bright): This surface finish provides enhanced corrosion resistance, smoother surface finish, and improved mechanical properties.
  • High Precision: Manufactured with strict tolerances to ensure a high level of precision, essential for hydraulic systems.
  • Durability: Strong and durable, suitable for high-pressure and demanding applications.

 

Surface Finish

  • NBK (Annealed Bright):
  • Annealed brightprocessing provides a smooth, polished finish, enhancing both aesthetic appeal and functional resistance to corrosion.
  • This surface finish reduces friction in hydraulic systems and extends the life of the components.
Specifications
Specification Details
Standard DIN 2391
Steel Grade  ST 35
Surface Finish NBK (Annealed Bright)
Application Hydraulic, automotive, industrial

 

Dimensions

Outside Diameter (mm) Wall Thickness (mm) Length (m)
6 – 100 1.0 – 10.0 6.0 (customizable)
Production Process
  1. Cold Drawing: The tube undergoes a cold-drawing process to improve its dimensional accuracy and mechanical properties, enhancing the tube’s strength and surface finish.
  2. Annealing (NBK): After cold drawing, the steel tube is annealed in a controlled process to relieve internal stresses, enhance ductility, and achieve the bright finish.
  3. Surface Treatment: The surface is further treated to remove any surface imperfections and improve resistance to corrosion and wear.
  4. Quality Control: Each tube undergoes rigorous quality control tests, including dimensional checks, pressure testing, and non-destructive testing (NDT), ensuring compliance with international standards.

 

Applications

  1. Hydraulic Systems: Ideal for high-pressure fluid transport, such as hydraulic cylinders, pumps, and valves.
  2. Automotive Industry: Used in the production of components requiring precision and high mechanical strength, including brake lines and steering systems.
  3. Industrial Machinery: Applied in various industrial machines and tools, such as injection molding machines and compressors.
  4. Energy and Manufacturing: Suitable for use in manufacturing equipment and machinery that operates under high pressure and requires precision parts.

 

 

Why Choose DIN 2391 ST 35 NBK Cold Drawn Seamless Steel Tube?

 

  • High Precision: Cold-drawn manufacturing ensures tight tolerances and a superior surface finish, crucial for precision applications.
  • Durable and Reliable: The seamless construction combined with the NBK finishmakes this tube ideal for long-term use in high-pressure and demanding environments.
  • Wide Range of Applications: Perfect for hydraulic, automotive, and industrial machinery, providing flexibility across different sectors.

 

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