EN 10225-4:2019
(Main)Weldable structural steels for fixed offshore structures - Technical delivery conditions - Part 4: Cold formed welded hollow sections
Weldable structural steels for fixed offshore structures - Technical delivery conditions - Part 4: Cold formed welded hollow sections
This document specifies requirements for submerged arc welded (SAW) and high frequency welded (HFW) cold formed hollow sections to be used in the fabrication of fixed offshore structures.
The thickness limit for SAWL circular hollow sections is up to and including 50,8 mm, for HFW circular hollow sections up to and including 25,4 mm and for HFW square and rectangular hollow sections up to and including 12,5 mm.
Greater thicknesses for SAWL hollow sections can be agreed provided the technical requirements of this European Standard are maintained.
NOTE 1 This document has an Annex E for SAWH round hollow sections with a thickness limit of 30,0 mm, and an Annex F for high strength square and rectangular HFW hollow sections made of steel grades S500 to S700.
This European Standard is applicable to steels for offshore structures designed to operate in the offshore sector but not to steels 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 2 This document has an informative Annex G on the prequalification of steels for fixed offshore structures in arctic areas.
Minimum yield strengths up to 700 MPa are specified together with impact properties at temperatures down to -40 °C.
NOTE 3 A range of material grades is specified in this standard and the user can select the grade most appropriate to the intended use and its service condition.
Schweißgeeignete Baustähle für feststehende Offshore-Konstruktionen - Technische Lieferbedingungen - Teil 4: Kaltgeformte geschweißte Hohlprofile
Dieses Dokument legt die Anforderungen an unterpulvergeschweißte (en: submerged arc welded, SAW) und hochfrequenzgeschweißte (en: high frequency welded, HFW) kaltgeformte Hohlprofile fest, die zur Herstellung von feststehenden Offshore-Konstruktionen verwendet werden.
Die Dickenbeschränkungen betragen für SAWL-Hohlprofile mit rundem Querschnitt 50,8 mm und für HFW-Hohlprofile mit rundem Querschnitt 25,4 mm und für HFW-Hohlprofile mit quadratischem und rechteckigem Querschnitt 12,5 mm.
Größere Dicken können für SAWL-Hohlprofile vereinbart werden, vorausgesetzt die technischen Lieferbedingungen dieser Europäischen Norm werden eingehalten.
ANMERKUNG 1 Dieses Dokument enthält einen Anhang E bezüglich runder spiralnahtgeschweißter (en: submerged arc welded helical, SAWH) Hohlprofile mit einer Dickenbegrenzung von 30,0 mm und einen Anhang F bezüglich hochfester HFW-Hohlprofile mit quadratischem und rechteckigem Querschnitt der Güten S500 bis S700.
Diese Europäische Norm gilt für Stähle für Offshore-Konstruktionen, die für den Offshore-Einsatz vorgesehen sind, jedoch nicht für Stähle zur Herstellung von Unterwasserpipelines, Steigleitungen (en: 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 2 Dieses Dokument hat einen informativen Anhang G bezüglich einer Vorqualifizierung von Stählen für den Einsatz in arktischen Gebieten bei Offshore-Konstruktionen.
Mindestwerte der Streckgrenze bis zu 700 MPa werden zusammen mit Werten für die Kerbschlagarbeit bis herunter zu Temperaturen von -40 °C angegeben.
ANMERKUNG 3 Eine Anzahl von Werkstoffen ist in dieser Norm festgelegt und der Anwender kann den am besten geeigneten Werkstoff aussuchen, der zu der beabsichtigten Verwendung und den Betriebsbedingungen passt.
Aciers de construction soudables destinés à la fabrication de structures marines fixes - Conditions techniques de livraison - Partie 4 : Profils creux soudés formés à froid
Le présent document spécifie les exigences applicables aux profils creux formés à froid soudés à l’arc
immergé (SAW) et soudés par haute fréquence (HFW) destinés à la fabrication de structures marines
fixes.
La limite d’épaisseur pour les profils creux à section circulaire SAWL est inférieure ou égale à 50,8 mm ;
elle est inférieure ou égale à 25,4 mm pour les profils creux à section circulaire HFW et inférieure ou égale
à 12,5 mm pour les profils creux à section carrée et rectangulaire HFW.
Des épaisseurs plus importantes peuvent être convenues par accord pour les profils creux SAWL, à
condition que les exigences techniques de la présente Norme européenne soient respectées.
NOTE 1 Le présent document a une Annexe E qui couvre les profils creux de section circulaire SAWH pour
lesquels est appliquée une limite d’épaisseur de 30,0 mm et une Annexe F qui traite des nuances d’acier S500 à S700
utilisés pour les profils creux HFW à section carrée et rectangulaire à haute limite élastique.
La présente norme européenne s’applique aux aciers pour constructions marines exploitées sur le
domaine maritime européen, à l’exclusion des aciers fournis pour réaliser des oléoducs sous‐marins,
conduites montantes, équipement de process 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.
NOTE 2 Le présent document a une Annexe G informative qui concerne la présélection des aciers destinés à la
construction de structures marines fixes dans les zones arctiques.
La norme spécifie les limites d’élasticité jusqu’à 700 MPa et les énergies de rupture en flexion par choc à
des températures jusqu’à – 40 °C.
NOTE 3 Une gamme de nuances est spécifiée dans cette norme et l'utilisateur peut choisir la nuance la mieux
appropriée à l'utilisation prévue et aux conditions de service.
Konstrukcijska jekla za varjene konstrukcije naftnih ploščadi - Tehnični dobavni pogoji - 4. del: Hladno oblikovani varjeni votli profili
Ta del standarda EN 10225 določa zahteve za obločno pod praškom varjene (SAW) in visokofrekvenčno varjene (HFW) hladno oblikovane votle profile, ki se uporabljajo za izdelavo konstrukcij naftnih ploščadi.
Omejitev glede debeline pri okroglih votlih profilih SAWL je do vključno 50,8 mm, za okrogle votle profile HFW do vključno 25,4 mm in za pravokotne votle profile HFW do vključno 12,5 mm.
Dogovori za večje debeline za votle profile SAWL so mogoči, če se ohranijo tehnične zahteve tega evropskega standarda.
OPOMBA 1: Na voljo je dodatek E o okroglih votlih profilih SAWH z omejitvijo glede debeline 30,0 mm in dodatek F o pravokotnih votlih profilih HFW visoke trdnosti razreda S550 do S700. Za dodatne informacije glejte ta dodatek.
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 2: Na voljo je dodatek G 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
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2019
Nadomešča:
SIST EN 10225:2009
Konstrukcijska jekla za varjene konstrukcije naftnih ploščadi - Tehnični dobavni
pogoji - 4. del: Hladno oblikovani varjeni votli profili
Weldable structural steels for fixed offshore structures - Technical delivery conditions -
Part 4: Cold formed welded hollow sections
Schweißgeeignete Baustähle für feststehende Offshore-Konstruktionen - Technische
Lieferbedingungen - Teil 4: Kaltgeformte geschweißte Hohlprofile
Aciers de construction soudables destinés à la fabrication de structures marines fixes -
Conditions techniques de livraison - Partie 4 : Profils creux soudés formés à froid
Ta slovenski standard je istoveten z: EN 10225-4:2019
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
77.140.70 Jekleni profili Steel profiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 10225-4
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.75 Supersedes EN 10225:2009
English Version
Weldable structural steels for fixed offshore structures -
Technical delivery conditions - Part 4: Cold formed welded
hollow sections
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 4 : Profils creux soudés 4: Kaltgeformte geschweißte Hohlprofile
formés à froid
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 10225-4:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Classification and designation . 10
4.1 Classification . 10
4.2 Designation . 10
5 Information to be supplied by the purchaser . 11
5.1 Mandatory information . 11
5.2 Options . 11
5.3 Examples of an order . 11
6 Manufacturing process . 12
6.1 Steel manufacturing process . 12
6.2 Condition of feedstock material . 12
6.3 Structural hollow section manufacturing process . 12
6.4 Qualification of personnel for NDT-activities . 12
6.5 Delivery condition . 13
7 Requirements . 13
7.1 General . 13
7.2 Chemical composition . 13
7.2.1 Heat analysis . 13
7.2.2 Product analysis . 13
7.2.3 Carbon equivalent values (CEV) and P . 13
cm
7.3 Mechanical properties . 14
7.3.1 General . 14
7.3.2 Post weld heat treatment (PWHT) . 14
7.3.3 Through thickness testing . 14
7.3.4 Flattening or bend test . 14
7.3.5 Prequalification for arctic areas . 14
7.4 Weldability data . 14
7.5 Internal soundness and non-destructive testing . 15
7.5.1 Non-destructive testing of the weld seam of hollow sections . 15
7.5.2 Laminar discontinuities of hollow sections . 15
7.6 Surface quality . 15
7.7 Dimensions, tolerances, mass . 16
7.7.1 Dimensions and tolerances on dimensions and shape . 16
7.7.2 Mass of steel . 16
8 Inspection . 16
8.1 General . 16
8.2 Types of inspection documents . 16
8.3 Summary of inspections . 18
8.4 Intermediary supply . 23
9 Frequency of testing and preparation of samples and test pieces . 23
9.1 Frequency of test . 23
9.1.1 Chemical analysis . 23
9.1.2 Tensile test and impact test . 23
9.1.3 Testing of the weld seam . 24
9.1.4 Testing of the corner regions for square or rectangular HFW hollow sections . 24
9.2 Selection and preparation of samples for product analysis. 24
9.3 Location of samples and orientation of tensile test pieces . 24
9.4 Location of samples and orientation of impact test pieces . 24
9.5 Preparation of test pieces for mechanical tests. 25
9.5.1 General . 25
9.5.2 Preparation of tensile test pieces . 25
9.5.3 Preparation of impact test pieces . 25
9.5.4 Test pieces for flattening and bend tests . 26
10 Test methods . 26
10.1 Chemical analysis . 26
10.2 Mechanical tests . 26
10.2.1 Test temperatures . 26
10.2.2 Tensile test . 26
10.2.3 Impact test . 26
10.2.4 Flattening test . 27
10.2.5 Weld bend test . 27
10.3 Visual inspection and dimensional check . 27
10.4 Non-destructive tests . 27
10.4.1 General . 27
10.4.2 NDT for the weld seam of HFW hollow sections . 28
10.4.3 NDT for the weld seam of submerged arc welded hollow sections . 28
10.4.4 Ultrasonic testing for laminar imperfections . 28
10.4.5 NDT for surface quality . 28
10.5 Retests, sorting and reprocessing . 28
11 Marking and bundling . 28
11.1 Die stamping and paint marking . 28
11.2 Bundling . 29
12 Options . 29
Annex A (normative when Option 1 is specified by the purchaser) Further details of steel
manufacturing procedures to be supplied by the manufacturer . 40
Annex B (normative when Option 17 is specified by the purchaser) Weldability testing and
mechanical testing of butt welds. 41
B.1 General requirements . 41
B.2 Welding processes and procedure . 41
B.3 Butt-weld requirements . 42
B.3.1 General . 42
B.3.2 Test piece dimensions. 42
B.3.3 Bevel detail . 43
B.3.4 Welding processes . 44
B.3.5 Nominal heat input. 44
B.3.6 Heat treatment of S355NLHCO, S355MLHCO, S420MLHCO, S460MLHCO, S500MLHCO,
S550MLHCO, S600 MLHCO, S650 MLHCO and S700MLHCO grades . 44
B.3.7 Dehydrogenation of test pieces . 45
B.4 Mechanical testing . 45
B.4.1 General . 45
B.4.2 Charpy-V-notch impact tests . 46
B.4.3 Fracture mechanic test . 47
B.4.4 Macrohardness . 48
B.4.5 Cross-weld tensile test . 49
Annex C (normative when Option 17 is specified by the purchaser) Weldability testing -
Bead-on-strip . 54
C.1 General . 54
C.2 Test material dimension . 54
C.3 Welding method . 54
C.4 Test condition . 54
C.5 Specific test requirements: Macrosection and hardness tests . 55
Annex D (normative when Option 17 is specified by the purchaser) Weldability testing -
Controlled thermal severity tests (CTS) . 57
D.1 General . 57
D.2 Test block dimensions . 57
D.3 General welding details . 57
D.3.1 Anchor welds . 57
D.3.2 Test welds . 57
D.4 Evaluation of the test welds . 58
D.5 Hardness testing . 58
Annex E (informative) Helical submerged arc welded (SAWH) hollow sections . 64
E.1 General . 64
E.2 Additional weld geometry tolerances . 64
Annex F (informative) High strength square and rectangular cold formed HFW hollow
sections . 65
Annex G (informative) Prequalification of steels for offshore structures operating in arctic
areas . 68
Bibliography. 69
European foreword
This document (EN 10225-4:2019) 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 10225-1:2019, EN 10225-2:2019, and EN 10225-3:2019, 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 welded hollow sections
In comparison to the previous edition following technical changes were made:
— welded cold formed hollow sections were only implicitly mentioned in the previous version.
Because of the split of the standard into four parts now a separate part with full requirements to
cold formed hollow sections for offshore structures is written;
— 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);
— there is an Annex E concerning SAWH hollow sections and an Annex F concerning high strength
square and rectangular HFW hollow sections, since the application of these hollow sections needs
more practical experience;
— an informative Annex G 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 submerged arc welded (SAW) and high frequency welded
(HFW) cold formed hollow sections to be used in the fabrication of fixed offshore structures.
The thickness limit for SAWL circular hollow sections is up to and including 50,8 mm, for HFW circular
hollow sections up to and including 25,4 mm and for HFW square and rectangular hollow sections up to
and including 12,5 mm.
Greater thicknesses for SAWL hollow sections can be agreed provided the technical requirements of
this European Standard are maintained.
NOTE 1 This document has an Annex E for SAWH round hollow sections with a thickness limit of 30,0 mm, and
an Annex F for high strength square and rectangular HFW hollow sections made of steel grades S500 to S700.
This European Standard is applicable to steels for offshore structures designed to operate in the
offshore sector but not to steels 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 2 This document has an informative Annex G on the prequalification of steels for fixed offshore
structures in arctic areas.
Minimum yield strengths up to 700 MPa are specified together with impact properties at temperatures
down to –40 °C.
NOTE 3 A range of material grades is specified in this standard and the user can select the grade most
appropriate to the intended use and its service condition.
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 10079, Definition of steel products
EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
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
EN 10219-2, Cold formed welded structural hollow sections of non-alloy and fine grain steels — Part 2:
Tolerances, dimensions and sectional properties
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 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels (ISO 2566-
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 5173:2010, Destructive tests on welds in metallic materials — Bend tests (ISO 5173:2009)
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 8492, Metallic materials — Tube — Flattening test (ISO 8492)
EN ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
EN ISO 10893-2, Non-destructive testing of steel tubes — Part 2: Automated eddy current testing of
seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections
(ISO 10893-2)
EN ISO 10893-3, Non-destructive testing of steel tubes — Part 3: Automated full peripheral flux leakage
testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection
of longitudinal and/or transverse imperfections (ISO 10893-3)
EN ISO 10893-5, Non-destructive testing of steel tubes — Part 5: Magnetic particle inspection of seamless
and welded ferromagnetic steel tubes for the detection of surface imperfections (ISO 10893-5)
EN ISO 10893-6, Non-destructive testing of steel tubes — Part 6: Radiographic testing of the weld seam of
welded steel tubes for the detection of imperfections (ISO 10893-6)
EN ISO 10893-7, Non-destructive testing of steel tubes — Part 7: Digital radiographic testing of the weld
seam of welded steel tubes for the detection of imperfections (ISO 10893-7)
EN ISO 10893-8, Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of seamless
and welded steel tubes for the detection of laminar imperfections (ISO 10893-8)
EN ISO 10893-9, Non-destructive testing of steel tubes — Part 9: Automated ultrasonic testing for the
detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes (ISO
10893-9)
EN ISO 10893-11, Non-destructive testing of steel tubes — Part 11: Automated ultrasonic testing of the
weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections
(ISO 10893-11)
EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition (ISO 14284)
EN ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for
mechanized and automatic welding of metallic materials (ISO 14732)
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)
EN ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures (ISO 19902)
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 10079,
EN ISO 4885, 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
cold forming
process where the forming to final shape of the welded hollow section is carried out at ambient
temperature
3.2
continuous casting process route (concast)
steel produced by a continuous casting process route
3.3
fine grain steel
steels with fine grain structure with an equivalent index of ferritic grain size ≥ 6
Note 1 to entry: For the determination of grain sizes except for Q steels see EN ISO 643.
3.4
high frequency welded hollow section (HFW)
hollow long product, open at both ends, of circular, square or rectangular section, made by pressure
welding in a continuous or non-continuous process, in which strip is formed cold into a hollow profile
and the seam weld made by heating the adjacent edges through the resistance to the passage of a high
frequency current and pressing the edges together
Note 1 to entry: The electric current may be applied by induction or conduction. After welding, the hollow
section maybe further cold processed into its final dimensions.
3.5
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
3.6
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
3.7
normalized rolled (feedstock material)
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.
3.8
normalizing (feedstock material)
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
3.9
parent product
product produced from one piece of steel
3.10
purchaser
purchaser or their representative
3.11
Submerged arc welding (SAW)
welding process that produces melting and coalescence of metals by heating them with an arc or arcs
between a bare metal consumable electrode or electrodes and the workpiece, wherein the arc and
molten metal are shielded by a blanket of granular flux
Note 1 to entry: Contact pressure is not used and part or all of the filler metal is obtained from the electrodes
[Source: EN ISO 3183:2012, 4.52]
3.12
SAWL hollow section
tubular product having one or two longitudinal seams produced by submerged-arc welding
3.13
SAWH hollow section
tubular product having one helical seam produced by submerged arc welding
3.14
thermomechanical rolling (feedstock material)
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: 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 2 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 special steels according to
EN 10020.
NOTE The steel grades in this standard are substantially modified from steel grades in EN 10219-1.
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 10225-4);
— 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
6.2); 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 6.2);
and
— the capital letter H for hollow sections;
— the capital letter C for cold formed; and
— the capital letter O for offshore structures.
EXAMPLE Structural steel (S) with a specified minimum yield strength for a thickness not greater than
16 mm of 420 MPa, thermomechanical rolled condition (M), with a minimum impact energy value of 60 J at −40 °C
(L), hollow section cold formed (HC), for offshore application (O):
EN 10225-4 – S420MLHCO
or
EN 10225-4 – 1.8675
NOTE For a transition period the previous EN 10225 grade designations and numbers are also given in
Tables 5 to 10 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 hollow sections, total length or mass);
b) the type of welding, either SAWL, SAWH or HFW;
c) details of the product form: CFCHS = cold formed circular hollow section (or CFRHS for square or
rectangular HFW hollow section);
d) the name of the standard for dimensions and tolerances and the dimensions and tolerances:
EN 10219-2;
e) the name of this standard (EN 10225-4) and the steel designation (steel name or steel number, see
4.2.2);
f) 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.
5.3 Examples of an order
50 submerged arc welded (SAWL) cold formed circular hollow sections (CFCHS) in accordance with
EN 10219-2 with specified dimensions 762 mm × 10,0 mm × 6 000 mm made according to EN 10225-4
from structural steel S420MLHCO for offshore application, supplied with inspection certificate 3.1 and a
product analysis:
50 SAWL-CFCHS – EN 10219-2 – 762 × 10,0 × 6000
EN 10225-4 – S420MLHCO – inspection certificate 3.1, Option7
or
50 SAWL CFCHS – EN 10219-2 – 762 × 10,0 × 6000
EN 10225-4 – 1.8675 – inspection certificate 3.1, Option 7
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 Condition of feedstock material
According to the designation given in the order the following delivery conditions apply for the feedstock
material used for the manufacture of cold formed hollow sections:
— normalized/normalized rolled (N) for steels of qualities N and NL;
— thermomechanically rolled (M) for steels of quality M and ML;
The feedstock material for SAWL hollow sections is according to the plate material of EN 10225-1.
Therefore the chemical composition and the CEV/P values of the steel grades for SAWL hollow
cm
sections is according to the corresponding steel grades in EN 10225-1. The feedstock material of SAWH
and HFW hollow section is hot rolled coil. Since there is no standardized pre-material, the chemical
composition and the CEV/P values of the steel grades for SAWH and HFW hollow sections is
cm
according to Tables 5, 6 and 8, 9 of this standard.
6.3 Structural hollow section manufacturing process
Cold formed structural hollow sections shall be manufactured by a welding process. Welded sections
manufactured by a continuous process shall not include the welds used to join the lengths of strip prior
to forming the hollow section.
HFW welded hollow sections shall be supplied with the external weld bead trimmed to an essentially
flush condition. Internal trimming is at the discretion of the manufacturer. Normally sections are
supplied without trimming the internal weld bead unless Option 21 is specified, see 7.5.1.
The ends of the hollow section shall be cut perpendicular to the axis of the product.
The operators shall be qualified according to EN ISO 9606-1 and EN ISO 14732.
6.4 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 ASNT TC-1A or EN ISO 9712.
It is recommended that the level 3 personnel be certified in accordance with EN ISO 9712 or ASNT.
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.
6.5 Delivery condition
The hollow sections shall be delivered cold formed without subsequent heat treatment to the full body.
The weld seam of HFW hollow sections shall be in the heat treated condition except when nominal
thickness is ≤ 6,3 mm the weld seam heat treatment is at the discretion of the manufacturer.
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 for SAWH and HFW hollow sections shall
comply with the values in Tables 5 and 8, for SAWL hollow sections shall comply to the corresponding
steel grades and tables in part 1 of this standard;
The deliberate addition of any elements other than those listed in Tables 5 and 8 shall not be permitted.
For residual element control, Boron (B) shall not be intentionally added.
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 for SAWH and HFW hollow sections shall
comply with the values given in Tables 5 and 8, for SAWL hollow sections shall comply to the
corresponding steel grades and tables in part 1 of this standard; 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 equations where each element is expressed as a
cm
mass percentage:
Mn Cr++Mo
...
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