DIN 2391-1



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.

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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