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EN 10305-4:2003 Seamless pipe & Manufacturing process

EN10305-4 cold drawn seamless  pipe 
Precision in size and surface E235 E355 
Mechanical properties at room temperature    
Delivery condition BK BKW GBK NBK
steel Grade Rm Mpa (Min) A %(Min) Rm Mpa(Min) A %(Min) Rm Mpa(Min) A %(Min) Rm Mpa(Min) ReH Mpa(Min) A %(Min)
St30Al or E215 430 8 380 12 280 30 290 to 430 215 30
St35 or E235 480 6 420 10 315 25 340 to 480 235 25
St45 or E255 580 5 520 8 390 21 440 to 570 255 21
St52 or E355 640 4 580 7 450 22 490 to 630 355 22


EN 10305 Seamless steel pipe

  • Grade: 10#, 20#, 45#, 16Mn, St37, St52, St45, St35.8, St37-2, St35.4, St52.4, St45-4, ST35, ST37.4, ST54
  • Thickness: 0.5 - 6 mm
  • Section Shape: Round
  • Outer Diameter: 3.75 - 60 mm
7  Manufacturing process
7.1 Steelmaking process
The steelmaking process is at the discretion of the manufacturer.
Steels shall be fully killed.
7.2  Tube manufacture and delivery conditions
7.2.1 The tubes shall be manufactured from hot finished seamless tubes by cold drawing. Other suitable
methods of cold working are permitted.
The tubes shall be delivered in the delivery condition +N which means that after the final cold drawing operation the
tubes are normalized in a controlled atmosphere.
7.2.2 All non-destructive testing (NDT) activities shall be carried out by qualified and competent level 1, 2 and/or
3 personnel authorised to operate by the employer.
The qualification shall be in accordance with EN 10256 or, at least, an equivalent to it.
It is recommended that the level 3 personnel be certified in accordance with EN 473 or, at least, an equivalent to it.
Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 10:25:08 BST 2006, Uncontrolled Copy, (c) BSI
A number of options are specified in this part of EN 10305 and these are listed below. In the event that the
purchaser does not indicate his wish to implement any of these options at the time of enquiry and order, the tubes
shall be supplied in accordance with the basic specification (see 6.1).
1: reduced internal roughness of ≤2 µm (see ;
2: lengths other than 6 m (see 8.5.2) ;
3: alternative marking (see clause 12) ;
4: protection by phosphatization (see 13.1) ;
5: protection by galvanization and chromatization type blue-white (see 13.1) ;
6: protection by galvanization and chromatization type yellow (see 13.1) ;
7: protection by galvanization and chromatization type olive green (see 13.1) ;
8: protection of tube ends (see 13.1) ;
9: special packaging (see 13.2).
 EN 10305 E235 E355 seamless steel pipe
German version EN 10305-4:2003 Seamless cold drawn tubes for hydraulic and pneumatic power systems,E235 E355 +N seamless steel pipe
6.3  Example of an order
1000 m tubes with an outside diameter of 20 mm and an inside diameter of 15 mm in accordance with this part of
EN 10305, made of steel grade E235, delivered in standard lengths with non-specific inspection and protected by
1000 m tubes - 20 x ID 15 - EN 10305-4 - E 235 – in standard lengths with non-specific inspection and testing
– option 4.
The operating authorisation issued by the employer shall be in accordance with a written procedure. NDT
operations shall be authorised by a level 3 NDT individual approved by the employer.
NOTE The definition of level 1, 2 and 3 can be found in appropriate standards, e.g. EN 473 and EN 10256.

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