Technical Information

(The following information supplied in our technical section has been compiled from various standards publications. It is by no means comprehensive and is for quick reference only.
For more detailed information please contact our sales department who will be happy to supply you with up-to-date technical help)

INTRODUCTION

As part of the exercise towards the removal of technical barriers to trade, the European Committee for Iron & Steel Standardisation (ECISS) has prepared a series of European Standards (ENs) for structural steels.

EN 10025 : 2004 is the new European standard for structural steel. The following pages show the new grades, properties and the nearest equivalent grades from former standards including EN 10025 : 1993. The grade designation system is also explained.

Christmas Stockholders can provide a very wide range of rolled sections and plates and the information following has been prepared to show how the new standard applies to these products.

The European Committee for Iron and Steel Standardisation is responsible for producing the European Standards (ENs) for structural steels. The first of these standards, EN 10025, was published in the UK by BSI as EN 10025:1990, partly superseding BS 4360 : 1986, which was reissued as BS 4360 : 1990. In 1993, a second edition of EN 10025 was made available together with EN 10113 : parts 1,2 & 3 and EN 10155. In June 1994, EN 10210 : part 1 was published and at the same time BS 4360 was officially withdrawn. The balance of the BS 4360 steels not affected by these ENs were re-issued in new British Standards BS 7613 and BS 7668.

In 1996, with the publication of EN 10137, BS 7613 was withdrawn. BS 7668 will remain until an EN for atmospheric corrosion resistant hollow sections is available.

In 2004 the standard EN 10025 was revised to address the provisions of EU Construction Products Directive (89/106/EEC). It is now published in six parts to bring together almost all the “Structural Metallic Products” into one comprehensive standard.

The New European Standard EN 10025 : 2004

The new standard is published in six parts and draws together earlier standards to produce one standard for the majority of structural steel products.

The six parts are:

  • PART 1 General technical delivery conditions.
  • PART 2 Technical delivery conditions for non-alloy structural steels.
    (Supersedes EN 10025 : 1993)
  • PART 3 Technical delivery conditions for normalised/normalised rolled weldable fine grain structural steels.
    (Supersedes EN 10113 : parts 1 & 2 : 1993)
  • PART 4 Technical delivery conditions for thermomechanically rolled weldable fine grain structural steels.
    (Supersedes EN 10113 : parts 1 & 3 : 1993)
  • PART 5 Technical delivery conditions for structural steels with improved atmospheric corrosion resistance – also known as weathering steels.
    (Supersedes EN 10155 : 1993)
  • PART 6 Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition.
    (Supersedes EN 10137 : parts 1 & 2 : 1996)

Grade Designation Systems

The designation systems used in the new standard are similar but not identical to EN 10025 : 1993 and very different to the more familiar BS 4360 designations so the guide below has been prepared to assist purchasers, specifiers, designers and steel users.

Symbols used in EN 10025 : part 2 : 2004
Non-alloy structural steels

  • S… Structural Steel
  • E… Engineering Steel
  • .235… Minimum yield strength (Reh) in MPa @ 16mm
  • …JO… Longitudinal Charpy V-notch impacts 27 J @ 0 deg C
  • …J2… Longitudinal Charpy V-notch impacts 27 J @ -20 deg C
  • …K2… Longitudinal Charpy V-notch impacts 40 J @ -20 deg C
  • …+AR Supply condition as rolled
  • …+N Supply condition normalised or normalised rolled
  • Customer Options
  • …C… Grade suitable for cold forming
  • …Z… Grade with improved properties perpendicular to surface
  • Examples: S235JR+AR, S355K2C+N

Grades, properties and nearest equivalents.

Table 1. EN10025 : part 2 : 2004 - Nonalloy structural steels

Comparison between grades in EN 10025: part 2 : 2004 & nearest equivalent versions in EN 10025 : 1993 and BS 4360 : 1990

EN 10025 : part 2 : 2004 EN 10025 : 1993 BS 4360 : 1990
Grade Yield (Reh) min Tensile (Rm) Charpy V-notch longitudinal Grade Grade
Strength at t = 16mm (MPa) Temp (deg C) Energy (J)
t = 16mm
S185 185 290/510 - - S185 -
- *1 235 360/510 - - S235 40A
S235JR *2 20 27 S235JRG1/G2 40B
S235J0 0 27 S235J0 40C
S235J2 -20 27 S235J2G3/G4 40D
- *1 275 410/560 - - S275 43A
S275JR *2 20 27 S275JR 43B
S275J0 0 27 S275J0 43C
S275J2 -20 27 S275J2G3/G4 43D
-*1 355 470/630 - - S355 50A
S355JR *2 20 27 S355JR 50B
S355J0 0 27 S355J0 50C
S355J2 -20 27 S355J2G3/G4 50D
S355K2 -20 40 S355J2G3/G4 50DD
E295 295 470/610 - - E295 -
S335 335 570/710 - - S335 -
E360 360 650/830 - - E360 -

(1 MPa = 1 N/mm2)

Notes:

1. For all products to be compliant with the EU Construction Products Directive (CPD 89/106/EC) the material must offer a guarenteed minimum impact performance. This has resulted in the removal of this grade from the standard, and the lowest grade now offered is the JR version for each yield strength variation.

2. Verification of the specified impact value is only carried out when agreed at the time of the enquiry and order.

Grades, properties and nearest equivalents (Cont).

Table 2. EN10025 : part 2 : 2004 - Nonalloy structural steels

Comparison between grades in EN 10025: part 2 : 2004 & nearest equivalent versions in EN 10025 : 1993 and BS 4360 : 1990

EN 10025 : part 3 : 2004

EN 10025 :

part 2 : 1993

BS 4360 : 1990
Grade Yield (Reh) min Tensile (Rm) Charpy V-notch longitudinal Grade Grade
Strength at t = 16mm (MPa) Temp (deg C) Energy (J)
t = 16mm
S275N 275 375/510 -20 40 S275N 43DD
S275NL -50 27 S275NL 43EE
S355N 355 470/630 -20 40 S355 50
S355NL -50 27 S355NL 50EE
S420N 420 520/680 -20 40 S420N -
S420NL -50 27 S420NL -
S460M 480 550/720 -20 40 S460M 55C
S460ML -50 27 S460ML 55EE

(1 MPa = 1 N/mm2)

Notes:

1. For all products to be compliant with the EU Construction Products Directive (CPD 89/106/EC) the material must offer a guaranteed minimum impact performance. This has resulted in the removal of this grade from the standard, and the lowest grade now offered is the JR version for each yield strength variation.

2. Verification of the specified impact value is only carried out when agreed at the time of the enquiry and order.

Table 3. EN10025 : part 4 : 2004 - Thermomechanically rolled weldable fine grain structural steels

Comparison between grades in EN 10025 : part 4 : 2004 & nearest equivalent versions in EN 10113 : part 3 : 1993

EN 10025 : part 4 : 2004

EN 10025 :

part 3 : 1993

Grade Yield (Reh) min Tensile (Rm) Charpy V-notch longitudinal Grade
Strength at t = 16mm (MPa) Temp (deg C) Energy (J)
t = 16mm
S275M 275 375/510 -20 40 S275N
S275ML -50 27 S275NL
S355M 355 470/630 -20 40 S355
S355ML -50 27 S355NL
S420M 420 520/680 -20 40 S420N
S420ML -50 27 S420NL
S460M 480 550/720 -20 40 S460M
S460ML -50 27 S460ML

 

Table 4. EN10025 : part 5 : 2004 - Structural steels with improved atmospheric corrosion resistance

Comparison between grades in EN 10025: part 5 : 2004 and nearest equivalent versions in EN 10155 : 1993 and BS 4360 : 1990

EN 10025 : part 5 : 2004

EN 10155 : 1993

BS 4360 : 1990
Grade Yield (Reh) min Tensile (Rm) Charpy V-notch longitudinal Grade Grade
Strength at t = 16mm (MPa) Temp (deg C) Energy (J)
t = 16mm
S235JOW 235 360/510 0

27

S235JOW -
S235J2W -20 27 S235J2W -
S355JOWP 355 470/630 0 27 S355JOWP WR50A
S355J2WP -20 27 S355J2WP -
S355JOW 355 470/630 0 27 S355JOW WR50B
S355J2W -20 27 S355J2W WR50C
S355K2W -20 40 S355K2W WR50D

(1 MPa = 1 N/mm2)

 

Mechanical properties for acceptance purposes (see Note 1)

        Charpy V-notch impact test (longitudinal)
Grade Yield
Stress
N/mm²
minimum
Tensile
Strength
N/mm²
Elongation
on 5,65 √So
% minimum
Thickness
mm
Average energy
J minimum
  Longitudinal Transverse
(See Note 3)
A 235 400 – 520
(see Note 1)
m
22
(see Note 2)
- - -
B ≤ 50 27 20
D > 50 ≤ 70 34 24
E > 70 ≤ 100 41 27

Impact tests are to be made on the various grades at the following temperatures:
A grade 20˚C
B grade 0˚C
C grade -20˚C
D grade -40˚C

NOTES

(1) Requirements for products over 50mm thick in Grades A, B and D and 100mm thick in Grade E are subject to agreement.
See 2.1.1.

(2) For full thickness tensile test specimens with a width of 25mm and a gauge length of 200mm (see Fig. 2.2.4 in Chapter 2),
the minimum elongation is to be:

Thickness mm   >5 >10 >15 >20 >25 >30 >35
  ≤5 ≤10 ≤15 ≤20 ≤25 ≤30 ≤35 ≤50
Elongation % 14 16 17 18 19 20 21 22

 

(3) Generally, tests need only be made in the longitudinal direction. For special applications, transverse test specimens may be required by the purchaser of LR. Transverse test results are to be guaranteed by the supplier.

(4) Impact tests are not required for Grade A material up to 50mm thick, nor for thicknesses above 50mm when the material is produced using a fine grained practice and is also normalized or thermomechanically controlled rolled.

(5) Impact tests are generally not required for Grade B steel of 25mm or less in thickness. However, the manufacturer should confirm, by way of regular in-house tests, and on occasional material selected by the Surveyor, that the material meets the above requirement. These results

 

NOTES

(1) For AH grade steels in all strength levels and thicknesses up to 12,5mm, the specified minimum manganese content is 0,70%.

(2) The steel is to contain aluminium, niobium, vanadium or other suitable grain refining elements, either singly or in any combination. When used singly, the steel is to contain the specified minimum content of the grain refining element. When used in combination, the specified minimum content of each element is not applicable.

(3) The total aluminium content may be determined instead of the acid soluble content. In such cases the total aluminium content is not to be less than 0,020%.

(4) Alloying elements other than those listed above are to be included in the approved manufacturing specification.

(5) The grain refining elements are to be in accordance with the approved composition.

(1) The requirements for products thicker than those detailed in the Table are subject to agreement.

(2) For full thickness tensile test specimens with a width of 25mm and a gauge length of 200mm, the minimum elongation is to be:

Thickness mm <5 >5
<10
>10
<15
>15
<20
>20
<25
>25
<30
>30
<40
>40
<50
>50
Elongation %

{

Strength level
32
Strength level
38
Strength level
40
                to be
specially
agreed
14 16 17 18 19 20 21 22
               
13 15 16 17 18 19 20 21
               
12 14 15 16 17 18 19 20

(3) In the case of FH grades, the requirements of this Table apply only up to a maximum thickness of 50mm.

 

 

EN10029:1991

Dimensional Tolerances

Tolerances on the nominal thickness  EN10029:1991

Nominal

thickness

ClassA ClassB ClassC ClassD
Lower Upper Lower Upper Lower Upper Lower Upper
≥ 3 < 5 -0,4 +0,8 -0,3 +0,9 0 +1,2 -0,6 +0,6
≥ 5 < 8 -0,4 +1,1 -0,3 +1,2 0 +1,5 -0,75 +0,75
≥ 8 < 15 -0,5 +1,2 -0,3 +1,4 0 +1,7 -0,85 +0,85
≥ 15 < 25 -0,6 +1,3 -0,3 +1,6 0 +1,9 -0,95 +0,95
≥ 25 < 40 -0,8 +1,4 -0,3 +1,9 0 +2,2 -1.1 +1,1
≥ 40 < 80 -1,0 +1,8 -0,3 +2,5 0 +2,8 -1,4 +1,4
≥ 80 < 150 -1,0 +2,2 -0,3 +2,9 0 +3,2 -1,6 +1,6
≥ 150 < 250 -1,2 +2,4 -0,3 +3,3 0 +3,6 -1.8 +1,8

 

Special tolerances for flatness  EN10029:1991
Dimensions in mm  Class N
Nominal thickness Steel type L (1) Steel type H (1)
Measuring Length  
1000 2000 1000 2000
≥3<5 9 14 12 17
≥5<8 8 12 11 15
≥8<15 7 11 10 14
≥15<25 7 10 10 13
≥25<40 6 9 9 12
≥40<250 5 8 8 11

 

If the distance between the points of contact of the straight-edge and the plate is <1000 mm the permissible deviation from flatness shall comply with the following requirements:
For steel type L max. 1% or for steel type H max. 1,5% of the distance between points of contact on the plate between 300mm to 1000mm, but not exceeding the values given in table 4.

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Please note that any specification or standard shown in this guide, including weights and properties is strictly for guidance purposes only, and Christmas Stockholders does not accept any liability for loss as a result of the specifications, weights, properties etc, shown within this guide.