DIN 2391-1

DIN2391

cold rolled precision seamless steel tubes


 Name: GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes
 GB/T 8713 precision seamless tubes for hydraulic pressure and pneumatic functions
 Size (mm): O.D.: 6.0∼219.0; W.T: 1∼30; L: max 12000
 Applications: autos, machinery, oil cylinders, motorcycle shock absorbers, and the inner cylinders of auto shock absorbers.

  Download More Details about DIN2391
Seamless mechanical tubing is manufactured from carbon and alloy steels for structural or other mechanical purposes involving machining or heat treating, where close tolerances, smooth finish, or definite physical properties are important factors. Cold Drawn Seamless stocks are generally carried to OD and ID tolerances, except when the ID is less than 50 percent of the OD. The latter sizes and hot finished seamless stocks are carried in warehouse to OD and wall tolerances.

Specifications:

OD (mm) Wall Thickness (mm)
  2 2.5 3 3.5 4 4.5 5 6 6.5-7 7.5-8 8.5-9 9.5-10 11 12
Φ25-Φ28                
Φ32                
Φ34-Φ36                
Φ38                
Φ40                  
Φ42                  
Φ45                
Φ48-Φ60              
Φ63.5              
Φ68-Φ73                
Φ76        
Φ80        
Φ83        
Φ89        
Φ95        
Φ102        
Φ108        
Φ114          
Φ121          
Φ127          
Φ133          
Φ140            
Φ146            
Φ152            
Φ159            
Φ168            
GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes GB/T 8713 precision seamless tubes for hydraulic pressure and pneumatic functions
Applications: >hydraulic pressure, pneumatic functions, autos, machinery, oil cylinders, motorcycle shock absorbers, and the inner cylinders of auto shock absorbers.
Size (mm): >O.D.:6.0-224.0; W.T.:1-15; L: max 12000

Grade and Chemical Composition (%):

Grade Chemical Composition (%):
C max Si max Mn P max S max
St 35 0.17 0.35 ≥0.40 0.025 0.025
St 45 0.21 0.35 ≥0.40 0.025 0.025
St 52 0.22 0.55 ≤1.60 0.025 0.025
Steel grade Chemical Composition (%):
Steel name Steel number C max Si max Mn P max S max Al min
E215 1.0212 0.10 0.05 0.70 0.025 0.025 0.025
E235 1.0308 0.17 0.35 1.20 0.025 0.025 -
E355 1.0580 0.22 0.55 1.60 0.025 0.025 -

Mechanical Properties (Mpa):

Steel grade BK BKW BKS GBK NBK
RmN/mm min min RmN/mm min min N/mm min ReH N/mm min min N/mm min min N/mm min ReH N/mm min min
St35 480 6 420 10 420 315 14 315 25 340-470 235 25
St45 580 5 520 8 520 375 12 390 21 440-570 235 21
St52 640 4 580 7 580 420 10 490 22 490-630 355 22
Steel grade Minimum values for delivery
Steel name Steel number + C + LC + SR + A + N
Rm Mpa A% Rm  Mpa A% Rm   Mpa ReH   Mpa A% ReH Mpa A% Rm  Mpa ReH   Mpa A%
E215 1.0212 430 8 380 12 380 280 16 280 30 290-430 215 30
E235 1.0308 480 6 420 10 420 350 16 315 25 340-480 235 25
E355 1.0580 640 4 580 7 580 450 10 450 22 490-630 355 22

A53 carbon steel pipe is the most common carbon steel, widely used on customer demand for steel products used. A106 higher alloy content than the A53. Pipe connections are frequently used to pipe fittings, such as three-way. Steel corrosion helps a lot in life.


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