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DIN 2391 Phosphated Precision Seamless Steel Tube
product description Standard: EN10305-4(DIN2445/2), EN10305-1(DIN2391), ASTM A179
Steel Grade: E235 (ST35 ST37.4 ) , E355 (ST52 ST52.4)
Size: OD: 4-120mm, WT: 0.5-10mm, Length: Fixed 6m or as your requirement
Surface treatment: Phosphated--internal and external phosphated coating
Delivery condition: +N (NBK) normalized under controlled atmosphere
Delivery time: 15-45 days according to the quantity you need and if the goods in stock
Product Advantages
  • Anti-rust
    High anti corrosion & anti rust
  • Total phosphating
    Phosphating inside and outside of steel pipe
  • Delicate
    The phosphated coating is delicate, high lubricity, uniform color
  • Exterior
    Good looking in appearance
  • Painting
    Suitable for painting, and have strong adhesion
Product Video

Cold drawn / cold rolled: High dimensional accuracy, excellent internal and external wall finish

Eddy current testing: Each steel pipe is tested by eddy current flaw detection to ensure product quality

Anaerobic bright heat treatment (NBK): When the seamless steel pipe is annealed, vacuum is applied and ammonia-decomposed nitrogen and hydrogen are injected for protection heating, heat preservation and cooling. It maintains the original rolling accuracy and smoothness of the steel pipe, and has excellent mechanical properties and metallographic structure.

Surface treatment (phosphated): We perform high-quality phosphating treatment on the inner and outer walls of seamless steel pipes to form a uniform and dense crystal structure, which has strong corrosion resistance and porosity, and has strong coloring ability during painting and plastic spraying.

 

 

Dimension

OD Thickness(m  m)
mm
6 6*1 6*1.5 6*2                
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            
10*1 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

 

 

Chemical composition

Steel grade

C

max.

Si

max.

Mn

max.

P

max.

S

max.

Altot

min.

Name Number
E215 1.0212 0.10 0.05 0.7 0.025 0.015 0.025
E235 1.0308 0.17 0.35 1.2 0.025 0.015
E355 1.0580 0.22 0.55 1.6 0.025 0.015

 

 

Tolerance

Outer Diameter Allowable tolerance special tolerance
GB/T3639 DIN2391 OD WT
4mm-20mm ±0.10mm ±0.08mm ±0.05mm ±0.05mm
20mm-30mm ±0.10mm ±0.08mm ±0.08mm ±0.08mm
31mm-40mm ±0.15mm ±0.15mm ±0.10mm ±0.08mm
41mm-60mm ±0.20mm ±0.20mm ±0.15mm ±0.15mm
61mm-80mm ±0.30mm ±0.30mm ±0.20mm ±0.20mm
81mm-120mm ±0.45mm ±0.45mm ±0.30mm ±0.30mm

 

 

Mechanical Properties

Steel grade Yield strengtha Tensile strength Elongation
Name Number ReH  Rm A
min. min. min.
MPa MPa %
E215 1.0212 215 290 to 430 30
E235 1.0308 235 340 to 480 25
E355 1.0580 355 490 to 630 22
Application
For Agricultural Machinery
For Agricultural Machinery
EN-10305 precision seamless steel tubes are widely used in various agricultural machinery.
Learn More
For Heavy Truck
For Heavy Truck
SAE J524 precision seamless steel tubes are widely used in various heavy trucks and special vehicles.
Learn More
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