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  • EN 10305-4 Seamless Cold Drawn Tubes
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  • EN 10305-4 Seamless cold drawn tubes
     
    EN 10305-4 E215,  E235,  E355  Seamless cold drawn tubes for hydraulic and pneumatic power systems
     
     
    Standard:EN 10305-4
     
    EN 10305-4 Steel tubes for precision applications - Technical delivery conditions - Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems.
    Tubes are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness.
     
     
    Main Grades:
    E215,  E235,  E355
     
     
    Manufacturing process
    Steels shall be fully killed.
     
     
     
    Tube manufacture and delivery conditions
    The tubes shall be manufactured from hot finished seamless hollows by cold drawing.
    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.
     
     
    Chemical composition

    Table 1 — Chemical composition (cast analysis)
     
    Steel grade 
    % by mass 
    Steel name Steel number C
    max.
    Si
    max.
    Mn
    max.
    P
    max.
    S  a
    max.
    Al total  b 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 0,015
    E355 1.0580 0,22 0,55 1,60 0,025 0,025 0,020
    Elements not quoted in this table (but see footnote b ) shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for the purposes of deoxidation and/or nitrogen binding. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steel making process.
    a  This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements, such as Ti, Nb or V. If added, the content of these elements shall be reported in the inspection document.When using titanium, the manufacturer shall verify that (Al + Ti/2) ≥ 0,020.

     
    Table 2 specifies the permissible deviations of product analysis from the specified limits on cast analysis given in Table 1.
     

     
    Table 2 — Permissible deviations of the product analysis from the specified limits on the cast analysis given in Table 1
     

    Element Specified limit of the cast
    Analysis  , % by mass
    Permissible deviation of
    the product analysis, % by mass
    C ≤ 0,22 + 0,02
    Si ≤ 0,55 + 0,05
    Mn ≤ 1,60 + 0,10
    P ≤ 0,025 + 0,005
    S ≤ 0,015 + 0,003
    Al ≥ 0,015 - 0,005
     

     
    Mechanical properties
     
    Table 3 — Mechanical properties at room temperature
     
    Steel grade Yield strength a R eH
    min.MPa
    Tensile strength
    R m  MPa
    Elongation after Fracture
    A min.%
    Steel name Steel number
    E215 1.0212 215 290 to 430 30
    E235 1.0308 235 340 to 480 25
    E355 1.0580 355 490 to 630 22
    The steel grades defined in this document have an intrinsic minimum transverse impact energy of 27 J at 0 °C.
    a   For tubes with outside diameter D ≤ 30 mm and wall thickness T ≤ 3 mm, the R eH minimum values are 10 MPa lower than the values given in this table.
     
     
     
     
    Appearance and soundness
    The tubes shall have smooth outer and inner surfaces with a roughness Ra ≤ 4 μm,
    NOTE In the case of the inner surface, this requirement applies to inside diameters ≥ 15 mm.
     
     
     
    Dimensions and tolerances

    Table 4 — Sizes and tolerances
     
    Specified outside diameter
    D  with tolerance a
     
    Specified inside diameter d
    with tolerance a
     
    Specified wall thickness T with tolerance a 
    4 ±0,08 3 ±0,15 0,5 ±0,10
    2 1 ±0,10
    5 ±0,08 3,5 ±0,15 0,75 ±0,10
    3 1 ±0,10
    6
     
    ±0,08 4 ±0,12 1 ±0,10
    3 ±0,15 1,5 ±0,15
    2 2 ±0,20
    8 ±0,08 6 ±0,10 1 ±0,10
    5 1,5 ±0,15
    4 ±0,15 2 ±0,20
    3 2,5 ±0,25
    10 ±0,08 8 ±0,08 1 ±0,10
    7 ±0,12 1,5 ±0,15
    6 ±0,15 2 ±0,20
    5 2,5 ±0,25
    12 ±0,08 10 ±0,08 1 ±0,10
    9 ±0,10 1,5 ±0,15
    8 ±0,12 2 ±0,20
    7 ±0,15 2,5 ±0,25
    6 3 ±0,30
    14 ±0,08 12 ±0,08 1 ±0,10
    11 1,5 ±0,15
    10 ±0,10 2 ±0,20
    9 ±0,12 2,5 ±0,25
    8 ±0,15 3 ±0,30
    15
     
    ±0,08 13 ±0,08 1 ±0,10
    12 1,5 ±0,15
    11 ±0,10 2 ±0,20
    10 ±0,12 2,5 ±0,25
    9 ±0,15 3 ±0,30
    16 ±0,08 14 ±0,08 1 ±0,10
    13 1,5 ±0,15
    12 ±0,10 2 ±0,20
    11 ±0,12 2,5 ±0,25
    10 ±0,15 3 ±0,30
    18
     
    ±0,08 16 ±0,08 1 ±0,10
    15 1,5 ±0,15
    14 2 ±0,20
    13 ±0,15 2,5 ±0,25
    12 3 ±0,30
    20 ±0,08 17 ±0,08 1,5 ±0,15
    16 2 ±0,20
    15 ±0,15 2,5 ±0,25
    14 3 ±0,30
    13 3,5 ±0,35
    12 4 ±0,40
    22 ±0,08 20 ±0,08 1 ±0,10
    19 1,5 ±0,15
    18 2 ±0,20
    17 2,5 ±0,25
    16 ±0,15 3 ±0,30
    15 3.5 ±0,35
    14 4   ±0,40
    25 ±0,08 22 ±0,08 1,5 ±0,15
    21 2 ±0,20
    20 2,5 ±0,25
    19 ±0,15 3 ±0,30
    17 4 ±0,40
    16 4.5 ±0,45
    15 5 ±0,50
    28 ±0,08 25 ±0,08 1,5 ±0,15
    24 2 ±0,20
    23 2,5 ±0,25
    22 ±0,15 3 ±0,30
    20 4 ±0,40
    18 5 ±0,50
    30 ±0,08 26 ±0,08 2 ±0,20
    25 2,5 ±0,25
    24 ±0,15 3 ±0,30
    22 4 ±0,40
    20 5 ±0,50
    18 6 ±0,60
    35 ±0,15 31 ±0,15 2 ±0,20
    30 2,5 ±0,25
    29 3 ±0,30
    27 4 ±0,40
    25 5 ±0,50
    23 6 ±0,60
    38 ±0,15 34 ±0,15 2 ±0,20
    33 2,5 ±0,25
    32 3 ±0,30
    30 4 ±0,40
    28 5 ±0,50
    26 6 ±0,60
    24 7 ±0,70
    22 8 ±0,80
    42 ±0,20 38 ±0,20 2 ±0,20
    36 3 ±0,30
    34 4 ±0,40
    32 5 ±0,50
    30 6 ±0,60
    26 8 ±0,80
    50 ±0,20 42 ±0,20 4 ±0,40
    40 5 ±0,50
    38 6 ±0,60
    34 8 ±0,80
    32 9 ±0,90
    30 10 ±1,00
    55 ±0,25
     
    47 ±0,25 4 ±0,40
    43 6 ±0,60
    39 8 ±0,80
    35 10 ±1,00
    60 ±0,25 50 ±0,25 5 ±0,50
    44 8 ±0,80
    40 10 ±1,00
    35 12.5 ±1,25
    70 ±0,30 60 ±0,30 5 ±0,50
    54 8 ±0,80
    50 10 ±1,00
    45 12.5 ±1,25
    80 ±0,35 68 ±0,35 6 ±0,60
    64 8 ±0,80
    60 10 ±1,00
    55 12.5 ±1,25
    a   Dimensions and tolerances only apply for the ordered pair of dimensions
     
     

    Preparation of ends
    The tubes shall be delivered with square cut ends. The ends shall be free from harmful burrs.
    NOTE For outside diameters D < 8 mm or inside diameters d < 4 mm, the tubes may have deformed ends.
     
     

    Inspection and testing
    Chemical analysis
    Tensile test
    Drift expanding test
    Dimensional inspection
    Non-destructive testing
    Visual examination
    NDT for verification of leak tightness
    Roughness measurement
    NDT on longitudinal imperfections
     
     
     
    Marking
    The following marking shall be applied indelibly on each tube. The marking shall be repeated continuously along a line parallel to the tube axis, with a maximum interval of 1,5 m between two sequences, 5 % of the tubes may contain only one mark.
     
    The marking shall include the following information:
    — the manufacturer’s name or trade mark;
    — the specified dimensions;
    — the number of this Standard;
    — the steel name;
    — in the case of specific inspection, an identification number (e.g.
     
     




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