EN 10305 seamless precision steel tube

Sunny Steel offers an extensive range of EN 10305 seamless precision steel tube.

EN 10305 seamless precision steel tube
EN10305-1, E235+N Seamless tube

EN 10305 is for seamless precision steel tube applications.

Applicastion for power steering

EN 10305 european standard specifies the technical delivery conditions for seamless cold drawn steel pipe of circular cross section used in hyhydraulic and pneumatic power systems.

Standard and Steel grade:

The allowed pressure rates and temperatures are the responsibility of the customer in accordance with the state of the art and in application of the safety coefficients specified in the application regulations, codes or standards.

Tubes according to this EN 10305 European standard are characterised by having precisely defined tolerances on dimensions and a specified surface roughness.

EN 10305 seamless precision steel tube shall be manufactured from hot finished seamless tubes by cold drawning. 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.

NBK means protective heat-treating under the non-oxidation enviroment to get a bright and smooth surface for the tubes.

Chemical composition(%) of EN 10305-1

Steel grade
 C(% max)  Si(% max)  Mn(% max)  P(% max)  S(% max)
 E215  1.0212  0.10  0.05  0.70  0.025  0.015
 E235  1.0308  0.17  0.35  1.20  0.025  0.015
 E355  1.0580  0.22  0.55  1.60  0.025  0.015

Mechanical and technological properties of EN 10305-1

 Yield strength
(min Mpa)
 Tensile strength
(min Mpa)
(min %)
 215  290-430  30
 235  340-480  25
 355  490-630  22

EN 10305-4 Tubes for hydraulic and pneumatic power systems

The pipes are used to manufacture hydraulic and pneumatic power systems of the I generation and they are also used in the pipelines of hydraulic and pneumatic systems. They are manufactured as seamless cold drawn tubes. They are provided in the +N delivery condition (normalized in a controlled atmosphere).

Chemical composition

Steel grade % of mass
Symbol C max. Si max. Mn max. P max S max Al total. Max
E215 0,10 0,05 0,70 0,025 0,015 0,025
E235 0,17 0,35 1,20 0,025 0,015 -
E355 0,22 0,55 1,60 0,025 0,015 -

Mechanical properties in room temperature

Steel grade Yield limit ReH Min. MPa Tensile strength Rm Min MPa Elongation A Min %
E215 215 290 to 430 30
E235 235 235 to 480 25
E355 355 490 to 630 22

Inspection and test list

Inspection and test type Inspection and test frequency
Internal tests Acceptance tests
Chemical analysis M M
Tensile testing M One pipe per every tested batch
Flattening test or expansion test M 2 per every tested batch
Dimension verification M M
Visual inspection M M
Quality grade of EN 10305-1

The tubes are supplied in the following quality grades :

  1. precision steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate.
  2. precision steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.
  3. precision steel tubes with special requirement according to section 12. Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering.

Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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