EN 10225-1:2019

Weldable structural steels for fixed offshore structures - Technical delivery conditions - Part 1: Plates

This document specifies requirements for weldable structural steels, in the form of plates, to be used in the fabrication of fixed offshore structures.
The following thickness limitations are given in this standard:
- S355NLO up to and including 200 mm;
- S355MLO, S420MLO, S460MLO, S500MLO up to and including 120 mm;
- S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO up to and including 150 mm.
Greater thicknesses can be agreed, provided the technical requirements of this European Standard are maintained.
This European Standard is applicable to steels for offshore structures, designed to operate in the offshore sector, including plate for structural hollow sections (see EN 10225-4). It does not apply to plates supplied for the fabrication of subsea pipelines, risers, process equipment, process piping and other utilities. It is primarily applicable to the North Sea Sector, but may also be applicable in other areas provided that due consideration is given to local conditions e.g. design temperature.
NOTE   This document has an informative Annex F on the prequalification of steels for fixed offshore structures in arctic areas.
Minimum yield strengths up to 690 MPa are specified together with impact properties at temperatures down to -40 °C.

Schweißgeeignete Baustähle für feststehende Offshore-Konstruktionen - Technische Lieferbedingungen - Teil 1: Bleche

Dieses Dokument legt die Anforderungen an Bleche aus schweißgeeigneten Baustählen fest, die zur Herstellung von feststehenden Offshore-Konstruktionen verwendet werden.
In dieser Norm werden folgende Dickenbeschränkungen angegeben:
- S355NLO bis zu 200 mm,
- S355MLO, S420MLO, S460MLO, S500MLO bis zu 120 mm,
- S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO bis zu 150 mm.
Größere Dicken können vereinbart werden, vorausgesetzt die technischen Lieferbedingungen dieser Europäischen Norm werden eingehalten.
Diese europäische Norm gilt für Stähle für Offshore-Konstruktionen, die für den Offshore-Einsatz vorgesehen sind, einschließlich Bleche für Hohlprofile (siehe EN 10225-4). Sie gilt jedoch nicht für Stähle zur Herstellung von Unterwasserpipelines, Steigleitungen (risers), Verfahrens-Ausrüstungen, Rohrsystemen und anderen Einrichtungen und Ausrüstungen. Sie gilt in erster Linie für den Bereich der Nordsee, kann jedoch auch für andere Gebiete angewendet werden, vorausgesetzt, dass die örtlichen Bedingungen, z. B. die Auslegungstemperatur, genügend berücksichtigt werden.
ANMERKUNG Dieses Dokument hat einen informativen Anhang F bezüglich einer Vorqualifizierung von Stählen für den Einsatz in arktischen Gebieten bei Offshore-Konstruktionen.
Mindestwerte der Streckgrenze bis zu 690 MPa werden zusammen mit Werten für die Kerbschlagarbeit bis herunter zu Temperaturen von -40 °C angegeben.

Aciers de construction soudables destinés à la fabrication de structures marines fixes - Conditions techniques de livraison - Partie 1 : Tôles

Le présent document spécifie les exigences applicables aux aciers de construction soudables destinés à
la fabrication de structures marines fixes sous forme de tôles.
Les limites d'épaisseur suivantes sont données dans la présente norme :
- S355NLO jusqu'à 200 mm inclus ;
- S355MLO, S420MLO, S460MLO, S500MLO jusqu'à 120 mm inclus ;
- S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO jusqu'à 150 mm inclus.
Des épaisseurs plus importantes peuvent être convenues par accord, à condition que les exigences
techniques de la présente Norme européenne soient respectées.
La présente norme s'applique aux aciers pour constructions marines exploitées sur le domaine maritime
européen, y compris les tôles pour les profils creux soudés formés à froid (voir l'EN 10225‐4). Elle ne
s'applique pas aux aciers fournis pour réaliser des oléoducs sous‐marins, conduites montantes,
équipement de procédés et autres tuyauteries de transport. Elle s'applique prioritairement au secteur de
la mer du Nord mais elle peut également s'appliquer dans d'autres zones dans la mesure où les conditions
locales sont dûment prises en compte, notamment la température de conception.
NOTE Le présent document comporte une Annexe F informative sur la présélection des aciers destinés à la
construction de structures marines fixes dans les zones arctiques.
Les limites d'élasticité jusqu'à 690 MPa sont spécifiées ainsi que les énergies de rupture en flexion par
choc à des températures jusqu'à - 40 °C.

Konstrukcijska jekla za varjene konstrukcije naftnih ploščadi - Tehnični dobavni pogoji - 1. del: Plošče

Ta del standarda EN 10225 določa zahteve za variva konstrukcijska jekla v obliki plošč, ki se uporabljajo za izdelavo konstrukcij naftnih ploščadi.
V tem standardu so podane naslednje omejitve debeline:
– S355NL1O do vključno 200 mm;
– S355ML1O, S420ML1O, S460ML1O, S500ML1O do vključno 120 mm;
– S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO do vključno 150 mm.
Dogovori za večje debeline so mogoči, če se ohranijo tehnične zahteve tega evropskega standarda.
Standard velja za jekla za konstrukcije naftnih ploščadi, projektirane za delovanje v priobalnem območju, vendar ne za jekla, dobavljena za izdelavo podmorskih cevovodov, dvižnih cevi, procesne opreme, procesnih cevovodov in drugih sredstev. Uporablja se predvsem na območju Severnega morja, lahko pa se uporablja tudi na drugih območjih, če se ustrezno upoštevajo lokalni pogoji, npr. temperatura.
OPOMBA:   Na voljo je dodatek F o predizbiri jekel za konstrukcije naftnih ploščadi v arktičnih območjih.
Minimalne napetosti tečenja do 690 MPa so določene skupaj z nizkotemperaturnimi lastnostmi pri temperaturah do –40 °C.

General Information

• Status: Published
• Publication Date: 14-May-2019
• Withdrawal Date: 29-Nov-2019
• ICS: 77.140.10 - Heat-treatable steels
• Technical Committee: ECISS/TC 103 - Structural steels other than reinforcements
• Drafting Committee: ECISS/TC 103/WG 8 - Revision of EN 10225:2009
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 06-Jan-2025
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 10225-1:2019 - Weldable structural steels for fixed offshore structures - Technical delivery conditions - Part 1: Plates

Relations

• Replaces: EN 10225:2009 - Weldable structural steels for fixed offshore structures - Technical delivery conditions
• Effective Date: 08-Jun-2022

Overview

EN 10225-1:2019 - Weldable structural steels for fixed offshore structures (Part 1: Plates) defines the technical delivery conditions for steel plates used in the fabrication of fixed offshore structures. Published as the Slovenian adoption of EN 10225-1:2019, it covers weldable structural steels intended primarily for the North Sea sector but applicable elsewhere when local design temperatures and conditions are considered. The standard specifies grade designations, manufacturing, testing, inspection and marking for plates - including thickness limits and mechanical property requirements - and includes an informative Annex F on prequalification for arctic service.

Key Topics and Requirements

• Scope and grade coverage: Plate grades include S355NLO; S355MLO, S420MLO, S460MLO, S500MLO; and higher-strength QLO grades up to S690QLO.
• Thickness limitations (standard default):
  • S355NLO up to and including 200 mm
  • S355MLO, S420MLO, S460MLO, S500MLO up to and including 120 mm
  • S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO up to and including 150 mm
    Greater thicknesses may be agreed if the standard’s technical requirements are maintained.
• Mechanical properties: Minimum yield strengths specified up to 690 MPa; impact properties required at temperatures down to –40 °C.
• Manufacturing and delivery conditions: Requirements for steelmaking processes, delivery condition, cold/hot forming, weldability data and post-weld heat treatment (PWHT) where applicable.
• Testing and inspection: Chemical and product analysis, tensile and impact testing, non-destructive testing (NDT), sampling frequency, marking and inspection documentation.
• Options & annexes: Includes purchaser options and normative annexes for weldability testing, bead-on-plate procedures, controlled thermal severity tests and cold forming; Annex F is informative for arctic prequalification.

Practical Applications

• Use for specifying offshore structural steel plates in jackets, topsides supports, piles, platforms and structural hollow sections (see companion Part 4 for cold-formed hollow sections).
• Not intended for subsea pipelines, risers, process equipment or piping.
• Helps purchasers, fabricators, welders, material suppliers, classification societies and design engineers ensure consistent mechanical, chemical and weldability performance for fixed offshore assets - especially where low temperature toughness and high strength are required.

Who Should Use This Standard

• Structural steel suppliers and mills, offshore fabricators, welding engineers, project procurement teams, classification societies and structural designers working on fixed offshore platforms and related structures.

Related Standards

• EN 10225 series: EN 10225-2 (Sections), EN 10225-3 (Hot finished hollow sections), EN 10225-4 (Cold formed hollow sections)
• EN 10027-1 (steel designation principles) and referenced welding and testing standards cited within EN 10225-1.

Keywords: EN 10225-1:2019, weldable structural steels, fixed offshore structures, steel plates, offshore steel grades, S355NLO, S690QLO, technical delivery conditions, arctic prequalification.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2019
Nadomešča:
SIST EN 10225:2009
Konstrukcijska jekla za varjene konstrukcije naftnih ploščadi - Tehnični dobavni
pogoji - 1. del: Plošče
Weldable structural steels for fixed offshore structures - Technical delivery conditions -
Part 1: Plates
Schweißgeeignete Baustähle für feststehende Offshore-Konstruktionen - Technische
Lieferbedingungen - Teil 1: Bleche
Aciers de construction soudables destinés à la fabrication de structures marines fixes -
Conditions techniques de livraison - Partie 1 : Tôles
Ta slovenski standard je istoveten z: EN 10225-1:2019
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 10225-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 77.140.10 Supersedes EN 10225:2009
English Version
Weldable structural steels for fixed offshore structures -
Technical delivery conditions - Part 1: Plates
Aciers de construction soudables destinés à la Schweißgeeignete Baustähle für feststehende Offshore-
fabrication de structures marines fixes - Conditions Konstruktionen - Technische Lieferbedingungen - Teil
techniques de livraison - Partie 1 : Tôles 1: Bleche
This European Standard was approved by CEN on 23 December 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10225-1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 7
4 Classification and designation . 8
4.1 Classification . 8
4.2 Designation . 8
5 Information to be supplied by the purchaser . 9
5.1 Mandatory information . 9
5.2 Options . 9
5.3 Example of an order . 10
6 Manufacturing process . 10
6.1 Steel manufacturing process . 10
6.2 Qualification of personnel for NDT-activities . 10
6.3 Delivery condition . 10
6.4 Thickness limits . 11
7 Requirements . 11
7.1 General . 11
7.2 Chemical composition . 11
7.2.1 Heat analysis . 11
7.2.2 Product analysis . 11
7.2.3 Carbon equivalent values (CEV) and P . 12
cm
7.3 Mechanical properties . 12
7.3.1 General . 12
7.3.2 Post weld heat treatment (PWHT) . 12
7.3.3 Strain age tests . 12
7.3.4 Through-thickness testing . 12
7.3.5 Fracture mechanic testing . 12
7.3.6 Prequalification for arctic areas . 13
7.4 Technological properties . 13
7.4.1 Cold forming characteristics of steel plate . 13
7.4.2 Hot forming procedures for steel plate . 13
7.4.3 Weldability data . 13
7.5 Internal soundness and non-destructive testing . 13
7.6 Surface quality . 13
7.7 Dimensions, tolerances, mass . 14
7.7.1 Dimensions and tolerances on dimensions and shape . 14
7.7.2 Mass of steel . 14
8 Inspection . 14
8.1 General . 14
8.2 Types of inspection documents . 14
8.3 Summary of inspections . 15
8.4 Intermediary supply . 15
9 Frequency of testing and preparation of samples and test pieces. 15
9.1 Frequency of test . 15
9.1.1 Chemical analysis . 15
9.1.2 Tensile test . 15
9.1.3 Impact test . 16
9.2 Selection and preparation of samples for product analysis. 16
9.3 Location of samples and orientation of tensile test pieces . 16
9.4 Location of samples and orientation of impact test pieces . 16
9.5 Preparation of test pieces for mechanical tests. 16
9.5.1 General . 16
9.5.2 Preparation of tensile test pieces . 16
9.5.3 Preparation of impact test pieces . 16
10 Test methods . 17
10.1 Chemical analysis . 17
10.2 Mechanical tests . 17
10.2.1 Test temperatures . 17
10.2.2 Tensile test . 17
10.2.3 Impact test . 18
10.3 Visual inspection and dimensional check . 18
10.4 Non-destructive tests . 18
10.4.1 General . 18
10.4.2 NDT for plates . 18
10.5 Retests, sorting and reprocessing . 19
11 Marking – Die stamping and paint marking . 19
12 Options . 19
Annex A (normative when Option 1 is specified by the purchaser) Further details of steel
manufacturing procedures to be supplied by the manufacturer . 34
Annex B (normative when Option 17 is specified by the purchaser) Weldability testing and
mechanical testing of butt welds. 35
Annex C (normative when Option 17 is specified by the purchaser) Weldability testing -
Bead-on-plate . 48
Annex D (normative when Option 17 is specified by the purchaser) Weldability testing -
Controlled thermal severity tests (CTS) . 51
Annex E (normative when Option 15 is specified by the purchaser) Cold forming
characteristics for steel plates . 58
Annex F (informative) Prequalification of steels for offshore structures operating in arctic
areas . 59
Annex G (informative) List of options of EN 10225-1 to -4 . 60
Bibliography . 62

European foreword
This document (EN 10225-1:2019) has been prepared by Technical Committee CEN/TC 459 “ECISS -
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2019, and conflicting national standards
shall be withdrawn at the latest by November 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document, together with EN 10225-2:2019, EN 10225-3:2019, and EN 10225-4:2019, supersedes
EN 10225:2009.
This European Standard consists of the following parts, under the general title 'Weldable structural
steels for fixed offshore structures – Technical delivery conditions':
— Part 1: Plates
— Part 2: Sections
— Part 3: Hot finished hollow sections
— Part 4: Cold formed hollow sections
In comparison to the previous edition the following technical changes were made:
— split of the standard in four parts;
— the steel names were adapted to EN 10027-1;
— former grades of group 3 are no longer listed, new options with the same enhanced properties have
been introduced (Options 2 and 3);
— an informative Annex F was added for the prequalification of steels for fixed offshore structures in
arctic areas.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

Through its subcommittee SC 3 “Structural steels other than reinforcements” (secretariat: DIN)
1 Scope
This document specifies requirements for weldable structural steels, in the form of plates, to be used in
the fabrication of fixed offshore structures.
The following thickness limitations are given in this standard:
— S355NLO up to and including 200 mm;
— S355MLO, S420MLO, S460MLO, S500MLO up to and including 120 mm;
— S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO up to and including 150 mm.
Greater thicknesses can be agreed, provided the technical requirements of this European Standard are
maintained.
This European Standard is applicable to steels for offshore structures, designed to operate in the
offshore sector, including plate for structural hollow sections (see EN 10225-4). It does not apply to
plates supplied for the fabrication of subsea pipelines, risers, process equipment, process piping and
other utilities. It is primarily applicable to the North Sea Sector, but may also be applicable in other
areas provided that due consideration is given to local conditions e.g. design temperature.
NOTE This document has an informative Annex F on the prequalification of steels for fixed offshore
structures in arctic areas.
Minimum yield strengths up to 690 MPa are specified together with impact properties at temperatures
down to –40 °C.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1011-1, Welding — Recommendations for welding of metallic materials — Part 1: General guidance
for arc welding
EN 10020, Definition and classification of grades of steel
EN 10021, General technical delivery conditions for steel products
EN 10027-1, Designation systems for steels — Part 1: Steel names
EN 10027-2, Designation systems for steels — Part 2: Numerical system
EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape
EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels
— Tolerances on dimensions and shape
EN 10079, Definition of steel products
EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections
— Part 1: General requirements
EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections
— Part 2: Plate and wide flats
EN 10164, Steel products with improved deformation properties perpendicular to the surface of the
product — Technical delivery conditions
EN 10168, Steel products — Inspection documents — List of information and description
EN 10204, Metallic products — Types of inspection documents
CEN/TR 10261, Iron and steel — European standards for the determination of chemical composition
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)
EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for
mechanical testing (ISO 377)
EN ISO 643, Steels — Micrographic determination of the apparent grain size (ISO 643)
EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels (ISO 2566-
1)
EN ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles (ISO 3452-1)
EN ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers (ISO
4063)
EN ISO 4136, Destructive tests on welds in metallic materials — Transverse tensile test (ISO 4136)
EN ISO 4885, Ferrous materials — Heat treatments — Vocabulary (ISO 4885)
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO
6892-1)
EN ISO 6947, Welding and allied processes — Welding positions (ISO 6947)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
EN ISO 9934-1, Non-destructive testing — Magnetic particle testing — Part 1: General principles (ISO
9934-1)
EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition (ISO 14284)
EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO
15614-1)
ISO 11484, Steel products — Employer’s qualification system for non-destructive testing (NDT) personnel
ISO 12135, Metallic materials — Unified method of test for the determination of quasistatic fracture
toughness
ISO 15653, Metallic materials — Method of test for the determination of quasistatic fracture toughness of
welds
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020, EN 10021,
EN ISO 4885, EN 10079 and EN ISO 14284 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
continuous casting process route (concast)
steel produced by a continuous casting process route
3.2
fine grain steel
steels with fine grain structure with an equivalent index of ferritic grain size ≥ 6 for steel grades with
ferritic/perlitic microstructure or with an equivalent index of former austenitic grain size ≥ 5 for steel
grades with martensitic/bainitic microstructure
Note 1 to entry: For the determination of grain sizes see EN ISO 643.
3.3
intermediary
organization that is supplied with products by the manufacturers and that then, in turn, supplies them
without further processing or after processing without changing the properties specified in the
purchase order and referenced product specification
3.4
manufacturer
organization that manufactures the respective products according to the requirements of the order and
to the properties specified in the referenced product specification to the final customer
3.5
normalized rolled
rolling process in which the final deformation is carried out in a certain temperature range leading to a
material condition equivalent to that obtained after normalizing so that the specified values of the
mechanical properties are retained even after normalizing
Note 1 to entry: In international publications for both the normalizing rolling, as well as the thermomechanical
rolling, the expression “controlled rolling” may be found. However in view of the different applicability of the
products a distinction of the terms is necessary.
3.6
normalizing
heat treatment with the object of refining and eventually making uniform the grain size of a ferrous
product and comprising heating it at a temperature slightly above A [A for hypereutectoid steels],
3 1
without prolonged soaking at this temperature, followed by cooling at a suitable rate
3.7
parent product
product rolled from one ingot or slab
3.8
purchaser
purchaser or their representative
3.9
quenching
operation which consists of cooling a ferrous product more rapidly than in still air
Note 1 to entry: Quenching includes direct quenching.
3.10
tempering
heat treatment applied to a ferrous product generally after quenching or other heat treatment to bring
the properties to the required level
Note 1 to entry: Tempering consists of heating to specific temperatures ( C1
followed by cooling at an appropriate rate.
3.11
thermomechanical rolling
rolling process in which the final deformation is carried out in a certain temperature range leading to a
material condition with certain properties which cannot be achieved or repeated by heat treatment
alone
Note 1 to entry: Hot forming or post weld heat treatment at a temperature above 580 °C may lower the strength
values and it is not recommended to be performed. Flame straightening can be applied in accordance with
CEN/TR 10347.
Note 2 to entry: Thermomechanical rolling can include processes with an increasing cooling rate with or
without tempering including self-tempering but excluding direct quenching and quenching and tempering.
Note 3 to entry: In some publications the word TMCP (Thermomechanical Control Process) is also used.
4 Classification and designation
4.1 Classification
All steel grades specified in this European Standard are classified as alloy special steels according to
EN 10020.
NOTE The steel grades in this European Standard are substantially modified from steel grades in
EN 10025-2, -3, -4, and -6.
4.2 Designation
4.2.1 For the products covered by this European Standard the steel names are allocated in accordance
with EN 10027-1; the steel numbers are allocated in accordance with EN 10027-2.
4.2.2 For steels for offshore structures the steel designation consists of:
— the number of this European Standard (EN 10225-1);
— the capital letter S for structural steel;
— the indication of the minimum specified yield strength for thicknesses ≤ 16 mm expressed in MPa;
— further designations for either
— normalized/normalized rolled structural steels: capital letters NL - letter N to indicate
normalized or normalized rolled, letter L to indicate specified impact properties at –40 °C (see
6.3); or
— thermomechanical rolled structural steels: capital letters ML - letter M to indicate
thermomechanical rolled, letter L to indicate specified impact properties at –40 °C (see 6.3); or
— quenched and tempered structural steels: capital letters QL - capital letter Q to indicate the
quenched and tempered condition, letter L to indicate specified impact properties at –40 °C
(see 6.3); and
— the capital letter O for offshore structures.
EXAMPLE 1 Structural steel (S) with a specified minimum yield strength for a thickness not greater than
16 mm of 355 MPa, normalized/normalized rolled condition with a minimum impact energy value of 50 J at
−40 °C, for offshore application:
EN 10225–1 — S355NLO
or
EN 10225–1 — 1.8808
NOTE For a transition period the old steel names and numbers are given in Tables 3 to 11 in brackets.
5 Information to be supplied by the purchaser
5.1 Mandatory information
The following information shall be supplied by the purchaser at the time of enquiry and order:
a) the quantity (number of plates or mass);
b) details of the product form: plate;
c) the name of the standard for dimensions and tolerances and the dimensions and tolerances:
EN 10029 (or EN 10051);
d) the name of this standard (EN 10225-1) and the steel designation (steel name or steel number, see
4.2.2);
e) standard designation in accordance with EN 10204 for an inspection certificate 3.1 or, if required,
inspection certificate 3.2 (see also Option 24).
5.2 Options
A number of options are specified in Clause 12. In the event that the purchaser does not indicate a wish
to implement any of these options, the manufacturer shall supply in accordance with the basic
specification (see 5.1). The options in Clause 12 are numbered through all four parts of EN 10225,
therefore some options are not available for this part (for a full list of the options see Annex G, Table
G.1).
5.3 Example of an order
50 plates in accordance with EN 10029 with specified dimensions 25 mm × 2 000 mm × 4 500 mm,
thickness tolerance class B, limited edge camber and out-of-squareness (G), special flatness tolerance S,
made according to EN 10225-1 from structural steel S355NLO for offshore application, supplied with
inspection certificate 3.1:
50 plates – EN 10029 B G S – 25 × 2 000 × 4 500
EN 10225-1 — S355NLO – inspection certificate 3.1
or
50 plates – EN 10029 B G S – 25 × 2 000 × 4 500
EN 10225-1 — 1.8808 inspection certificate 3.1
6 Manufacturing process
6.1 Steel manufacturing process
The steel manufacturing process shall be at the discretion of the manufacturer with the exception that
the open hearth (Siemens-Martin) process shall not be employed.
All steels shall be fully killed.
All steels shall be made to fine grain practice.
See Option 1 (further details of steel manufacturing process)
See Option 2 (vacuum degassed and/or ladle refined)
See Option 3 (reduced S-content)
All products shall be traceable to the cast.
6.2 Qualification of personnel for NDT-activities
All NDT activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel
authorized to carry out this work by the employer.
The qualification shall be in accordance with ISO 11484 or, at least, an equivalent to it.
It is recommended that the level 3 personnel be certified in accordance with EN ISO 9712 or, at least, an
equivalent to it.
The operating authorization issued by the employer shall be in accordance with a written procedure.
NDT operations shall be authorized by a level 3 NDT individual approved by the employer.
NOTE The definition of levels 1, 2 and 3 can be found in the appropriate standards, e.g. EN ISO 9712 and
ISO 11484.
6.3 Delivery condition
Plates shall be supplied in the furnace normalized/normalized rolled (N), thermomechanically rolled
(M) or quenched and tempered (Q) condition as shown in Tables 3 to 11.
See Option 4 (furnace normalizing is mandatory)
6.4 Thickness limits
6.4.1 The maximum thickness of product from the continuous casting process shall be at the
manufacturer's discretion.
6.4.2 The minimum rolling reduction ratio for plate made of steel from continuous casting process
with a thickness up to and including 120 mm shall be 3:1 if all of the following limitations are met:
a) one or more of the following low hydrogen practices are used: vacuum degassing during
steelmaking, controlled soaking of the slabs or plates or controlled slow cooling of the slabs or
plates;
b) the sulfur content is 0,004 % or less, based upon heat analysis;
c) one or more of the following practices are used:
 electromagnetic stirring during casting;
 soft reduction during casting; or
 heavy pass reductions (min. 30 mm for min. one pass in the first rolling schedule) during plate
rolling.
Otherwise a reduction ratio of minimum 4:1 is mandatory.
See Option 5 (other more severe reduction ratios)
7 Requirements
7.1 General
In addition to the requirements of this European Standard, the general technical delivery requirements
specified in EN 10021 apply.
7.2 Chemical composition
7.2.1 Heat analysis
The chemical composition determined by heat analysis shall comply with the values in Tables 3, 6 and
9;
The deliberate addition of any elements other than those listed in Tables 3, 6 and 9 shall not be
permitted. For residual element control, Boron (B) shall not be intentionally added to steel grades up to
and including S500.
Any further restrictions in heat analysis shall be agreed between the manufacturer and the purchaser at
the time of the enquiry and order, see Option 6 (restricted heat analysis).
7.2.2 Product analysis
The chemical composition determined by product analysis shall comply with the values given in Tables
3, 6 and 9, for verification see Option 7 (product analysis).
Any further restrictions in product analysis shall be agreed between the manufacturer and the
purchaser at the time of enquiry and order, see Options 6 and 7 (restricted product analysis).
7.2.3 Carbon equivalent values (CEV) and P
cm
CEV and P shall be calculated using the following formulae where each element is expressed as a
cm
mass percentage:
Mn Cr++Mo V Ni+ Cu
(1)
CEV=C++ +
6 5 15
Si Mn+ Cu+ Cr Ni Mo V
(2)
Pcm=C++ + + ++ 5B
30 20 60 15 10
The maximum permissible CEV and P values are given in Tables 4, 7 and 10. Either the P or/and
cm cm
the CEV is reported at the discretion of the manufacturer, unless otherwise agreed between
manufacturer and purchaser at the time of enquiry and order. See Option 8 (agreement whether to
report a P or/and CEV value).
cm
7.3 Mechanical properties
7.3.1 General
Under the inspection and testing conditions as specified in Clause 8 and, if requested, in the simulated
heat treatment conditions given in 7.3.2, the mechanical properties at the verification test temperature
shall comply with the relevant requirements given in Tables 5, 8 and 11. Samples (from which test
pieces are taken) shall be tested in the delivery condition.
7.3.2 Post weld heat treatment (PWHT)
Where a requirement for PWHT is foreseen, the items concerned shall be ordered with additional
testing according to Option 9.
The simulated PWHT shall be at 580 °C ± 20 °C if not otherwise agreed (see Option 10) for a minimum
soaking time of 1 h per 25 mm thickness of product but maximum 4 h.
7.3.3 Strain age tests
Strain age testing shall not be carried out, except when Option 11 is specified.
See Option 11 (strain age testing)
It is recommended to specify Option 11, if the plate material is to be used for the production of SAWL
hollow sections according to part 4 of this standard or other critical components for offshore
applications.
7.3.4 Through-thickness testing
Through-thickness testing shall not be carried out, except when Option 12 is specified.
See Option 12 (through thickness testing)
7.3.5 Fracture mechanic testing
Data is not required except when Option 14 is specified.
See Option 14 (fracture mechanic testing)

IIW, International Institute of Welding formula.
7.3.6 Prequalification for arctic areas
If specified at the time of enquiry and order testing at specified lower temperatures shall be carried out.
See informative Annex F (testing at lower temperatures as prequalification for arctic areas shall be
done, e.g. for arctic area 1, 2 or 3 at −20 °C, −30 °C or −40 °C).
7.4 Technological properties
7.4.1 Cold forming characteristics of steel plate
If required at the time of enquiry and order the steel manufacturer shall make available data which
characterizes the cold forming behaviour of these steels. If such data is not available or is deemed
inadequate by the purchaser, additional testing may be specified (see Annex E).
See Option 15 (plate cold forming procedures)
7.4.2 Hot forming procedures for steel plate
If required at the time of enquiry and order the steel manufacturer shall provide general information on
the procedures and effects of hot forming on material properties.
See Option 16 (plate hot forming procedures)
Materials in delivery condition M or Q are generally unsuitable for subsequent normalizing or hot
forming above 580 °C. Heating above 580 °C may lower the strength values. If subsequent processing at
temperatures above 580 °C is required, reference should be made to the manufacturer.
7.4.3 Weldability data
Weldability data is not required, except when Option 17 is specified.
See Option 17 (weldability data, this option shall already be requested at the time of enquiry)
Regardless of the revision of the standard, weldability studies performed with a former version of
EN 10225 remains valid, provided chemical composition and mechanical properties comply with the
current version.
This data refers only to the weldability of the material being supplied and is intended for use in
development and preparation of fabrication procedures. The manufacturer does not have to fulfil the
requirements of a welding procedure qualification test (WPQT), nor provide data to it.
7.5 Internal soundness and non-destructive testing
All plates shall be ultrasonically tested in accordance with EN 10160 and shall meet the requirements of
EN 10160, class S /E , unless Option 18 is specified.
0 1.
See Option 18 (Ultrasonic test according to EN 10160, class S /E shall be met)
1 2
7.6 Surface quality
All surfaces of plates shall be 100 % visually inspected. The surface condition shall comply with
EN 10163-2, Class A, sub-class 3 if not otherwise agreed at the time of enquiry and order.
Repair of defects such as cracks, shells or seams (in accordance with EN 10163-1 and EN 10163-2) shall
be followed by magnetic particle inspection or dye penetrant inspection.
7.7 Dimensions, tolerances, mass
7.7.1 Dimensions and tolerances on dimensions and shape
The dimensions and tolerances of the product shall be in accordance with one of the relevant European
Standards EN 10029 or EN 10051.
Unless otherwise agreed plate thickness tolerances shall be in accordance with EN 10029 Class A.
7.7.2 Mass of steel
The calculated mass shall be determined using a density of 7,85 kg/dm .
8 Inspection
8.1 General
Products complying with this European Standard shall be ordered and delivered with an inspection
certificate 3.1 or 3.2 as specified in EN 10204. The type of document shall be agreed upon at the time of
enquiry and order. If the order does not contain any specification of this type, an inspection certificate
3.1 shall be issued.
See Option 24 (inspection certificate 3.2).
8.2 Types of inspection documents
The inspection certificate 3.1 or 3.2 shall include, in accordance with EN 10168, the following codes
and/or relevant information where applicable:
A — commercial transactions and parties involved;
B — description of products to which the inspection certificate applies;
C01-C03 — location of the samples, direction of test pieces and test temperature;
C10-C13 — tensile test — Test piece shape and test results;
C40-C43 — impact test — Test piece type and test results, if applicable;
C50-C69 — other tests if applicable (e.g. strain age test, through thickness properties);
C71-C92 — heat analysis and, if applicable, product analysis (as a minimum all the elements referred
to in Tables 3, 6, 9 as applicable), the CEV or the Pcm shall be reported;
D01 —  statement that marking and identification, surface appearance, shape and dimensional
properties are satisfactory;
D02-D50 — if applicable, statement confirming that the NDT testing has been carried out and that the
test results are satisfactory;
D51-D99 — results on the agreed additional product tests (options);
Z —  validation.
In addition, if an inspection certificate 3.2 is ordered, the purchaser shall notify the manufacturer of the
address of the organization or person nominated by him to carry out the inspection and validate the
inspection document.
Results of weldability testing in accordance with Option 17 and Annexes B, C and D shall not form any
part of the inspection document.
8.3 Summary of inspections
Table 1 — Mandatory specific inspection for structural steels for offshore structures
Inspection requirements Inspection programme
Subclause
Type of test
reference(s)
7.2 see 9.1.1
1 Heat analysis
10.1 One per cast
see 9.1.2
7.3.1
2 Tensile test One test per test unit
10.2.2
each 40 tonnes
see 9.1.3
Mandatory
7.3.1 One set of test pieces per
3 Impact test
tests
10.2.3 test unit
each 40 tonnes
Internal Soundness of 7.5 see 10.4
plates - Ultrasonic testing 10.4 All products, full length
Surface condition and 7.6, 7.7
5 see 10.3
dimensions 10.3
8.4 Intermediary supply
If any steel is supplied from an intermediary's stock, the intermediary shall be responsible for:
a) supplying to the purchaser a copy of the original order requirements placed on the mill and the
subsequent sales history of the product;
b) supplying to the purchaser all documentation required by this standard;
c) satisfying the purchaser by means of numbers or identification marks on the steel that such steel
has been tested and complies with all the requirements of this European Standard as applicable.
9 Frequency of testing and preparation of samples and test pieces
9.1 Frequency of test
9.1.1 Chemical analysis
The heat analysis and, if required, the product analysis (see Option 7) shall be determined once per
cast.
9.1.2 Tensile test
The verification of the mechanical properties shall be carried out by test unit. A test unit comprises 40
tonnes or part thereof, of material from the same steel cast in the same heat treatment condition and of
the same thickness range for the yield strength as given in Tables 5, 8 and 11 providing that the
thickness variation for the order quantity is not more than 5 mm above or below the thickness of the
product sample. One sample for one tensile test shall be taken from one sample product of each test
unit, unless Option 25 is specified.
See Option 25 (Test frequency for every specified plate thickness).
Where ingot practice is used for plates, one sample product shall be taken from each parent plate.
9.1.3 Impact test
For the test unit see 9.1.2. One sample sufficient for 2 sets of three impact test pieces shall be taken
from one sample product of each test unit, unless Option 25 is specified.
See Option 25 (Test frequency for every specified plate thickness).
9.2 Selection and preparation of samples for product analysis
Samples for product analysis, if required, shall be taken from the sample product or alternatively from
test pieces used for mechanical testing or from the full thickness at the same location as for the
mechanical test samples. The preparation of samples shall be in acc
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