Limestone Quarry Plant

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DIN 2391 EN10305 Boiler Seamless Pipe


DIN 2391  Seamless precision steel pipes for Hydraulic system-ST 35, ST 45, ST 52 in BK and BK+S 
DIN 2393 DOM steel tube for mechinery 
EN10305-1 Seamless precision steel pipe for machinery use 
EN10305-2 Welded precision steel pipe for oil cylinder tube 
EN 10305-4 hydraulic bending precision seamless steel tubes 
Mechanical Tubing: EN 10305-3, BS 6323 Part 5, DIN 2394 
Cold Drawn Welded Tubes: EN 10305-2, BS 6323 Part 6, DIN 2393
din 2391 boiler seamless pipe
 
DIN Cold Drawing and BA Seamless Tube with High Precision 
  Synopsis of Process Routing: quality carbon steel → cold drawing → bright heat treatment without oxidization (NBK status) → nondestructive testing. In the wall honing and inside flushing under the high pressure→. Antirust oiling outside surface→plastic capping on both ends 
  Main Features: high accuracy, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high cleanness inside wall. The steel tube is able to stand high pressure. No deformation after cold bending, no crack after flaring and flattening . The complicated geometrical forming and machining can be realized. Color of tube: gray with white. 
  Main Application: to be used in hydraulic system, automobile and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.  
 
 
Grade

Mfg. Process

Chemical composition

 

C Si Mn P S Ni Cr Mo Others a
b
c
d
St30Si S 0.10Max 0.30Max ÷0.55 0.040Max 0.040Max - - - - a
b
c
d
St30A1 S 0.10Max 0.05Max ÷0.55 0.040Max 0.040Max - - - Al deoxydized a
b
c
d
St35 S 0.17Max 0.35Max ∶0.40 0.050Max 0.050Max - - - - a
b
c
d
St45 S 0.21Max 0.35Max ∶0.40 0.050Max 0.050Max - - - - a
b
c
d
St52 S 0.22Max 0.55Max ∶1.60 0.050Max 0.050Max - - - - a
b
c
d

a.Cold-finished/hard b.Cold-finished/soft c.Annealed d.Normalized 
Grade

 

Material 
number

Tensile Test MPa or N/mm2

Remaks(Similar to JIS)

Possibility Temperature

Min Yield point

Tensile Strength

St30Si 1.0211 - 400Min (STKM11)  
- 355Min  
- 285Min  
215 295~420  
St30Al 1.0212 - 400Min (STKM11)  
- 355Min  
- 285Min  
215 295~420  
St35 1.0308 - 440Min (STC38)  
- 370Min  
- 315Min  
235 340~470  
St45 1.0408 - 540Min (STKM13)  
- 470Min  
- 390Min  
255 440~570  
St52 1.0580 - 590Min (STKM19)  
- 540Min  
- 490Min  
350 490~630  
 
The products are used for control rod, shock absorber, transmission shaft, steering axle, front and rear axle, stabilizer rod, muffler and replacement parts for varieties of middle and high class carsand business cars.
 
Main steel grades:1035, 1045,16Mn, 20Cr, 40Cr, CK35, CK45, SAE1035, SAE1045, St37, St45, St52, etc.
These tubes are manufactured according to DIN 2391 and EN 10305-1. All aspects such as mechanical properties and dimension tolerances highly conform to the requirements of diesel engine tube. In view of oil tube's special quality requirements, we use high quality raw material St34.2, St35, St37,St37.4, St45, St52 from No.5 Steel Group worldwide Baosteel which is better in mechanical properties regarding elongation rate, tensile strength, especially high pressure resistance. 
 
 
DELIVERY CONDITION
Designation Symbol Delivery Condition Description
Cold drawn / hard +c(BK) No heat treatment after the final cold drawing process
Cold drawn / soft +LC(BKW) After the final heat treatment there is a suitable drawing pass.
Cold drawn and stress relieved +SR(BKS) After the final cold drawing process there is a stress relief heat t treatment in a controlled atmosphere
Annealed +A(GBK) After the final cold drawing process the tubes are annealed in a controlled atmosphere
Normal +N(NBK) After the final cold drawing process the tubes are normalized in a controlled atmosphere
 
 

Welded Steel Tubing and pipe-Corresponding to DIN 2391-1 

Wall thickness 
s
Nominal dimension 0.5 0.8 1 1.2 1.5 1.8 2 2.2 2.5 2.8 3 4.5 5 5.5 6 7 8 9 10 12 14 16 18 20 22 25
Permissible deviation                                                    
Outside diameter da                                                    
Nominal dimension Permissible deviation                                                    
4 +/-0.1

 

                                                 
5                                                    
6                                                    
7                                                    
8                                                    
9                                                    
10                                                    
12 【0.08                                                    
14                                                    
15                                                    
16                                                    
18                                                    
20                                                    
22                                                    
25                                                    
26                                                    
28                                                    
30                                                    
32 【0.15                                                    
35                                                    
38                                                    
40                                                    
42 【0.20                                                    
45                                                    
48                                                    
50                                                    
55 【0.25                                                    
60                                                    
65 【0.30                                                    
70                                                    
75 【0.35                                                    
80                                                    
85 【0.40                                                    
90                                                    
95 【0.45                                                    
100                                                    
110 【0.50                                                    
120                                                    
130 【0.70                                                    
140                                                    
150 【0.80                                                    
160                                                    
170 【0.90                                                    
180                                                    
190 【1.0                                                    
200                                                    
220 【1.20                                                    
240                                                    
260 【1.30                                                    


1) For outside diameters of nominal dimensions 4 and 5 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【 20 % For outside diameters of nominal dimensions 6 to 8 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【15%.

    s/D 
=1/60
  s/D 
=1/40
   s/D 
=1/

 

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