EN 10210-3:2020
(Main)Hot finished steel structural hollow sections - Part 3: Technical delivery conditions for high strength and weather resistant steels
Hot finished steel structural hollow sections - Part 3: Technical delivery conditions for high strength and weather resistant steels
This document specifies technical delivery conditions for high strength and weather resistant hot-finished seamless, electric welded and submerged arc welded steel structural hollow sections of circular, square, rectangular or elliptical forms.
It applies to hollow sections formed hot, with or without subsequent heat treatment, or formed cold with subsequent heat treatment above 580 °C to obtain equivalent mechanical properties to those obtained in the hot formed product.
NOTE 1 The requirements for tolerances, dimensions and sectional properties are specified in EN 10210-2.
NOTE 2 The attention of users is drawn to the fact that whilst cold formed grades in EN 10219-3 can have equivalent mechanical properties to hot-finished grades in this document the sectional properties of square and rectangular hollow sections in EN 10210-2 and EN 10219-2 are not equivalent.
NOTE 3 A range of material grades is specified in this document and the user can select the grade most appropriate to the intended use and service conditions. The grades and mechanical properties of the finished hollow sections are generally comparable with those in EN 10025-4, EN 10025-5 and EN 10025-6.
NOTE 4 The requirements for seamless and welded steel structural hollow sections for use in offshore structures are covered in the EN 10225 series.
NOTE 5 Spiral welded hollow sections are expected to be used with caution in applications involving dynamic behaviour (fatigue stress) as, up to now, there is insufficient data regarding their performance.
Warmgefertigte Hohlprofile für den Stahlbau - Teil 3: Technische Lieferbedingungen für höher- und wetterfeste Stähle
Dieses Dokument legt die technischen Lieferbedingungen für warmgefertigte nahtlose, elektrisch und unterpulvergeschweißte Hohlprofile aus höher- und wetterfesten Stählen mit kreisförmiger, quadratischer, rechteckiger oder elliptischer Form fest.
Sie gilt für warmgefertigte Hohlprofile mit oder ohne nachfolgende Wärmebehandlung sowie für kaltgeformte Hohlprofile mit einer anschließenden Wärmebehandlung oberhalb von 580 °C um gleichwertige mechanische Eigenschaften wie bei den warmgeformten Erzeugnissen zu erzielen.
ANMERKUNG 1 Die Anforderungen an die Grenzabmaße, Maße und statischen Werte sind in EN 10210-2 festgelegt.
ANMERKUNG 2 Der Anwender wird darauf aufmerksam gemacht, dass die kaltgeformten Hohlprofile nach EN 10219-3 zwar vergleichbare mechanische Eigenschaften zu den warmgefertigten Hohlprofilen nach EN 10210-3 aufweisen können, dass aber die Maße und statischen Werte von quadratischen und rechteckigen Hohlprofilen nach EN 10210-2 und EN 10219-2 nicht vergleichbar sind.
ANMERKUNG 3 Eine Anzahl von Stahlsorten ist in dieser Norm festgelegt und der Anwender kann die geeignetste Sorte für die beabsichtigte Verwendung aussuchen. Die Sorten und die mechanischen Eigenschaften der fertigen Hohlprofile sind im Allgemeinen vergleichbar mit den Sorten die in EN 10025-4, EN 10025-5 und EN 10025-6 aufgeführt sind.
ANMERKUNG 4 Nahtlose und geschweißte Hohlprofile für Offshore-Konstruktionen werden in der Europäischen Normenserie EN 10225 behandelt.
ANMERKUNG 5 Es wird erwartet, dass spiralnahtgeschweißte Hohlprofile mit Vorsicht bei Anwendungen, die dynamische Beanspruchung (Ermüdungsbelastung) einschließen, verwendet werden, da es bis heute nur unzureichende Daten bezüglich des Verhaltens gibt.
Profils creux de construction finis à chaud en aciers - Partie 3 : Conditions techniques de livraison des aciers à haute limite élastique et des aciers à résistance améliorée à la corrosion atmosphérique
Le présent document spécifie les conditions techniques de livraison pour les profils creux de construction finis à chaud des aciers à haute limite élastique et des aciers à résistance améliorée à la corrosion atmosphérique sans soudure, soudés électriquement et soudés à l’arc immergé de forme circulaire, carrée, rectangulaire ou elliptique.
Il s’applique aux profils creux formés à chaud, avec ou sans traitement thermique ultérieur, ou formés à froid avec traitement thermique ultérieur supérieur à 580 °C afin d’obtenir des caractéristiques mécaniques équivalentes à celles des produits formés à chaud.
NOTE 1 Les exigences pour les tolérances, dimensions et caractéristiques de section sont spécifiées dans l’EN 10210-2.
NOTE 2 L’attention des utilisateurs est attirée sur le fait que, même si les nuances formées à froid de l' EN 10219-3 peuvent avoir des caractéristiques mécaniques équivalentes aux nuances finies à chaud du présent document, les caractéristiques de section des profils creux carrés et rectangulaires de l’EN 10210-2 et de l’EN 10219-2 ne sont pas équivalentes.
NOTE 3 Une gamme de nuances de matériau est spécifiée dans le présent document, et l’utilisateur peut sélectionner la nuance la plus appropriée à l’utilisation et aux conditions de service prévues. Les nuances et caractéristiques mécaniques des profils creux finis sont généralement comparables à celles de l’EN 10025-4, l’EN 10025-5 et l’EN 10025-6.
NOTE 4 Les exigences pour les profils creux de construction en aciers sans soudure et soudés destinés aux structures marines sont couvertes par la série des EN 10225.
NOTE 5 Les profils creux soudés en spirale doivent être utilisés avec prudence dans les applications impliquant un comportement dynamique (contrainte en fatigue) important car jusqu'à présent, les données concernant leurs performances sont insuffisantes.
Vroče izdelani votli konstrukcijski profili iz jekla - 3. del: Tehnični dobavni pogoji za jekla z visoko trdnostjo in vodoodporna
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2020
Vroče izdelani votli konstrukcijski profili iz jekla - 3. del: Tehnični dobavni pogoji
za jekla z visoko trdnostjo in vodoodporna
Hot finished steel structural hollow sections - Part 3: Technical delivery conditions for
high strength and weather resistant steels
Warmgefertigte Hohlprofile für den Stahlbau - Teil 3: Technische Lieferbedingungen für
Anwendungen im Maschinenbau
Profils creux de construction finis à chaud en aciers - Partie 3 : Conditions techniques de
livraison pour des applications de construction mécanique
Ta slovenski standard je istoveten z: EN 10210-3:2020
ICS:
77.140.45 Nelegirana jekla Non-alloyed steels
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 10210-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 77.140.75
English Version
Hot finished steel structural hollow sections - Part 3:
Technical delivery conditions for high strength and
weather resistant steels
Profils creux de construction finis à chaud en aciers - Warmgefertigte Hohlprofile für den Stahlbau - Teil 3:
Partie 3 : Conditions techniques de livraison des aciers Technische Lieferbedingungen für höher- und
à haute limite élastique et des aciers à résistance wetterfeste Stähle
améliorée à la corrosion atmosphérique
This European Standard was approved by CEN on 10 August 2020.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10210-3:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms, definitions and symbols . 6
4 Classification and designation . 7
5 Information to be obtained by the manufacturer . 9
6 Manufacturing process . 10
7 Requirements . 11
8 Inspection . 15
9 Frequency of testing and preparation of samples and test pieces . 19
10 Test methods . 21
11 Marking . 23
Annex A (informative) Structural hollow sections of non-alloy quality steels — Chemical
composition and mechanical properties . 24
Annex B (informative) Structural hollow sections of normalized/normalized rolled steels
— Chemical composition and mechanical properties . 25
Annex C (normative) Structural hollow sections of thermomechanical formed steels —
Chemical composition and mechanical properties . 26
Annex D (normative) Structural hollow sections of quenched and tempered steels —
Chemical composition and mechanical properties . 31
Annex E (normative) Structural hollow sections of steels with improved atmospheric
corrosion resistance — Chemical composition and mechanical properties . 36
Annex F (normative) Location of samples and test pieces . 38
Annex G (informative) Hot finished hollow section production processes, manufacturing
routes and delivery conditions . 40
Bibliography . 43
European foreword
This document (EN 10210-3:2020) has been prepared by Technical Committee CEN/TC 459/SC 3
“Structural steels other than reinforcements”, the secretariat of which is held by DIN.
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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
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.
EN 10210 consists of the following parts:
— EN 10210-1, Hot finished steel structural hollow sections - Part 1: Technical delivery conditions
— EN 10210-2, Hot finished steel structural hollow sections - Part 2: Tolerances, dimensions and
sectional properties
— EN 10210-3, Hot finished steel structural hollow sections - Part 3: Technical delivery conditions for
high strength and weather resistant steels
It forms part of a series of standards on hollow sections together with EN 10219-1 to EN 10219-3.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
1 Scope
This document specifies technical delivery conditions for high strength and weather resistant hot-
finished seamless, electric welded and submerged arc welded steel structural hollow sections of
circular, square, rectangular or elliptical forms.
It applies to hollow sections formed hot, with or without subsequent heat treatment, or formed cold
with subsequent heat treatment above 580 °C to obtain equivalent mechanical properties to those
obtained in the hot formed product.
NOTE 1 The requirements for tolerances, dimensions and sectional properties are specified in EN 10210-2.
NOTE 2 The attention of users is drawn to the fact that whilst cold formed grades in EN 10219-3 can have
equivalent mechanical properties to hot-finished grades in this document the sectional properties of square and
rectangular hollow sections in EN 10210-2 and EN 10219-2 are not equivalent.
NOTE 3 A range of material grades is specified in this document and the user can select the grade most
appropriate to the intended use and service conditions. The grades and mechanical properties of the finished
hollow sections are generally comparable with those in EN 10025-4, EN 10025-5 and EN 10025-6.
NOTE 4 The requirements for seamless and welded steel structural hollow sections for use in offshore
structures are covered in the EN 10225 series.
NOTE 5 Spiral welded hollow sections are expected to be used with caution in applications involving dynamic
behaviour (fatigue stress) as, up to now, there is insufficient data regarding their performance.
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 1011-2, Welding - Recommendations for welding of metallic materials - Part 2: Arc welding of ferritic
steels
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 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10168, Steel products - Inspection documents - List of information and description
EN 10204, Metallic products - Types of inspection documents
EN 10210-2, Hot finished steel structural hollow sections - Part 2: Tolerances, dimensions and sectional
properties
CEN/TR 10261, Iron and steel - European standards for the determination of chemical composition
EN 10266, Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in
product standards
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 4885, Ferrous materials - Heat treatments - Vocabulary (ISO 4885)
EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1)
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 10893-6, 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 10893-10, Non-destructive testing of steel tubes - Part 10: Automated full peripheral ultrasonic
testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal
and/or transverse imperfections (ISO 10893-10)
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 14713-2:2009, Zinc coatings - Guidelines and recommendations for the protection against
corrosion of iron and steel in structures - Part 2: Hot dip galvanizing (ISO 14713-2:2009)
EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules
(ISO 15607)
EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding
procedure specification - Part 1: Arc welding (ISO 15609-1)
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
15614-11)
ISO 11484, Steel products — Employer's qualification system for non-destructive testing (NDT) personnel
SNT TC-1A, Personnel Qualification and Certification in Nondestructive Testing
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purpose of this document, the terms and definitions given in EN 10020, EN 10021, EN 10266
and EN ISO 4885 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 https://www.iso.org/obp
3.1.1
hot finished
hollow sections formed hot, with or without subsequent heat treatment, or formed cold with
subsequent heat treatment above 580 °C to obtain equivalent metallurgical conditions to those
obtained in the hot formed product
3.1.2
cold forming
process where the forming to final shape of the welded hollow section is carried out at ambient
temperature
Note 1 to entry: Circular hollow sections produced from normalized strip with a normalized weld seam and
with a cold forming ratio of D/T ≥ 20 may be classified as hot-finished hollow sections.
3.1.3
thermomechanical forming
simultaneously performed forming process and heat treatment in which the final deformation from
round to rectangular/square/elliptical hollow sections is carried out in a certain temperature range
above 580 °C leading to a material condition with certain properties which cannot be achieved or
repeated by heat treatment alone
Note 1 to entry: Thermomechanical rolling leading to the delivery condition M can include processes with an
increased cooling rate with or without tempering including self-tempering but excluding direct quenching as well
as quenching and tempering.
Note 2 to entry: In some publications, the word TMCP (Thermomechanical Control Process) is also used.
3.1.4
steel with improved atmospheric corrosion resistance
steel in which a certain number of alloying elements has been added in order to increase its resistance
to atmospheric corrosion, by forming an auto-protective oxide layer on the base metal under the
influence of weather conditions
Note 1 to entry: Steel with improved atmospheric corrosion resistance is often called weathering steel.
Note 2 to entry: Additional information for the use of steel with improved atmospheric corrosion resistance is
given in Annex E.
3.1.5
quenching and tempering
process which consists of the following two steps:
— first quenching, where the steel is heated up above the AC3 temperature and then rapidly cooled
down in liquids to create a process specific grain structure;
— afterwards tempering, during which the steel is heated up to a certain temperature to adjust the
desired properties and cooled down in air afterwards
3.1.6
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 +QT steels, see EN ISO 643.
3.1.7
hot-dip zinc coating
application of a zinc coating by immersing the prepared strip or hollow section in a molten bath
containing a zinc content of at least 98%
3.2 Symbols
For the purposes of this document, the symbols defined in EN 10266 apply.
4 Classification and designation
4.1 Classification
4.1.1 Within the grades of steels given in Annex C and D five qualities M, ML, Q, QL and QL1 are
specified. These differ in respect of the carbon, sulphur and phosphorus content, low temperature
impact properties, production process, heat treatment and grain size.
In accordance with the classification system in EN 10020, all steel grades are alloy special steels.
4.1.2 Within the grades of steels given in Annex E, three qualities J0, J2 and K2 are specified. These
differ in respect of specified impact requirements and limits on values of various elements.
In accordance with the classification system in EN 10020, all steel grades in Annex E are alloy special
steels.
4.2 Designation
4.2.1 For the products covered by this document, 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 The designation of steel hollow sections consists of:
a) the number of this document (EN 10210-3);
b) the capital letter S for structural steel;
c) the indication of the minimum specified yield strength for thicknesses ≤ 16 mm expressed in MPa;
d) further designations for either:
1) thermomechanical formed structural steels:
i) capital letter M to indicate thermomechanical rolled with specified impact properties at
−20 °C (see 6.5);
ii) capital letters ML for qualities with specified impact properties at –50 °C; or
2) structural steels in the quenched and tempered condition:
i) capital letter Q to indicate the quenched and tempered condition with specified impact
properties at −20 °C (see 6.5);
ii) capital letters QL or QL1 for qualities with specified impact properties at –40 or –50 °C; or
3) steels with improved atmospheric corrosion resistance:
i) the characters J0 for the qualities with specified impact properties at 0 °C;
ii) the characters J2 or K2 for the qualities with specified impact properties at −20 °C; and
iii) the letter W (weather) for improved atmospheric corrosion resistance; and
e) the capital letter H to indicate hollow sections.
EXAMPLE 1 Hollow section made of structural steel (S) with a specified minimum yield strength for a
thickness not greater than 16 mm of 460 MPa, quenched and tempered condition (Q), with a minimum impact
energy value of 30 J at -20 °C, hollow section (H):
EN 10210-3 — S460QH
or
EN 10210-3 — 1.8608
EXAMPLE 2 Hollow section made of structural steel (S) with a specified minimum yield strength for a
thickness not greater than 16 mm of 355 MPa, with a minimum impact energy value of 27 J at −20 °C (J2), weather
resistant steel (W) hollow section (H):
EN 10210-3 — S355J2WH
or
EN 10210-3 — 1.8645
5 Information to be obtained by the manufacturer
5.1 Mandatory information
The following information shall be contained in the order document at the time of enquiry and order:
a) the quantity (mass or total length);
b) details of the product form:
1) HFCHS = hot finished circular hollow sections;
2) HFRHS = hot finished square or rectangular hollow sections;
3) HFEHS = hot finished elliptical hollow sections;
c) the name of the standard for dimensions and tolerances (EN 10210-2);
d) the dimensions and the type of length, length range or length (see EN 10210-2);
e) the steel designation (see 4.2).
5.2 Options
A number of options are specified in EN 10210-2 and this document. Those relevant to this part are
listed below with appropriate clause references. In the event that the purchaser does not indicate a
wish to implement any of these options at the time of enquiry and order, the hollow sections shall be
supplied in accordance with the basic specification.
3.1 Internal weld bead trimmed (see 6.4.2);
3.2 Empty (Option for EN 10219 series)
3.3 Product analysis (see 7.1.1);
3.4 Empty;
3.5 Tensile test in corner region (see 7.2.1);
3.6 Impact test in corner region (see 7.2.2).
3.7 Verification of impact properties for quality J0 (see 7.2.3);
3.8 The product shall have a chemical composition suitable for hot-dip-zinc coating (see
7.3.2);
3.9 Weld repairs to the body of structural steel hollow sections are permitted (see 7.4.4);
3.10 Full peripheral NDT (non-destructive testing) of circular tubes for imperfections - not
possible for elliptical, rectangular, square and SAW (submerged arc welded) hollow
sections (see 7.5);
3.11 Ultrasonic testing for laminar imperfections (see 7.5);
3.12 Inspection certificate 3.1 for steel grade S355J0WH of Annex E instead of a test report
2.2 (see 8.1);
3.13 Inspection certificate 3.2.
5.3 Example of an order
100 t hot finished square hollow section in accordance with EN 10210-2 with specified outside
dimensions 100 mm × 100 mm and wall thickness of 8 mm of 12 m approximate length, grade S460QH
according to this document and supplied with inspection certificate 3.1:
EXAMPLE 100 t – HFRHS – EN 10210-2 — 100 × 100 × 8 – approximate length 12 m
EN 10210-3 — S460QH
6 Manufacturing process
6.1 General
Structural hot finished hollow sections of thermomechanical rolled and quenched and tempered steels
shall conform to Annexes C and D and steels with improved atmospheric corrosion resistance shall
conform to the requirements of Annex E.
In addition, the general technical delivery requirements specified in EN 10021 shall apply.
6.2 Steel manufacturing process
6.2.1 The steel manufacturing process shall be at the discretion of the hollow section manufacturer
with the exception that the open hearth (Siemens-Martin) process shall not be employed.
6.2.2 The method of deoxidation shall be as specified in Tables C.1, D.1 and E.1.
6.3 Grain structure
The steels grades given in Annexes C and D shall have a ferritic grain size equal to or finer than 6 when
measured in accordance with EN ISO 643 (see 7.2.4).
6.4 Structural hollow section manufacturing process
6.4.1 Structural hollow sections shall be manufactured by a seamless or by a welding process (see
informative Annex G, Table G.1). 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, except as
permitted in 10.4.3.
6.4.2 Electric welded hollow sections shall be supplied with the external weld bead trimmed to an
essentially flush condition. Trimming of the internal weld bead is at the discretion of the manufacturer
unless Option 3.1 is specified.
Option 3.1 Electric welded hollow sections shall be supplied with the internal weld bead trimmed, the
maximum height of the internal weld bead after trimming shall be agreed at the time of enquiry and
order.
6.4.3 All NDT activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel
authorized to operate by the employer.
The qualification shall be in accordance with ISO 11484 or SNT 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 products shall be delivered in the conditions indicated below:
— Qualities M and ML — thermomechanical formed,
— Qualities Q, QL and QL1 — quenched and tempered,
— Qualities J0W, J2W and K2W —improved atmospheric corrosions resistance.
7 Requirements
7.1 Chemical composition
7.1.1 The chemical composition determined by the cast analysis and reported by the steel producer
shall comply with the requirements given in Tables C.1, D.1 or E.1.
The maximum carbon equivalent value (CEV) for all grades, based on the cast analyses, given in Tables
C.2, D.2 and E.2 shall apply.
When determining the CEV, the following formula of the International Institute of Welding (IIW) shall
be used:
Mn Cr++Mo V Ni+ Cu
CEV=C+ + +
6 5 15
In addition to the cast analysis the following option can be specified by the purchaser at the time of
enquiry and order:
Option 3.3 For products supplied with specific inspection and testing, a product analysis shall be
reported.
Deviations of the product analysis from the specified limits of the cast analysis shall be in accordance
with Table 1.
7.1.2 When products are supplied with a control on Si e.g. for hot-dip zinc-coating there could be a
need, for certain grades and thicknesses, to increase the content of other elements such as C and Mn, to
achieve the required mechanical properties. In such cases, the maximum carbon equivalent values of
Table C.2 to Table E.2 may be increased as follows:
— for Si ≤ 0,04 %, increase the value of the CEV by 0,02;
— for Si ≤ 0,25 %, increase the value of the CEV by 0,01.
Table 1 — Permissible deviations of the product analysis from the specified limits of the cast
analysis specified in Tables C.1, D.1 and E.1
Permissible deviation of the
Permissible maximum content in product analysis from
Element
the cast analysis specified limits for the cast
analysis
% by mass % by mass
≤ 0,20 + 0,02
C
> 0,20 + 0,03
≤ 0,60 + 0,05
Si
> 0,60 + 0,06
thermomechanical formed ≤ 2,10 + 0,10
Mn quenched and tempered ≤ 1,70 + 0,10
weather ≤ 1,50 – 0,05 / + 0,10
thermomechanical formed ≤ 0,030,
+ 0,005
quenched and tempered ≤ 0,025
P
weather ≤ 0,035 + 0,010
thermomechanical formed ≤ 0,025 + 0,005
S
quenched and tempered ≤ 0,015 + 0,002
weather ≤ 0,035 + 0,010
Nb ≤ 0,060 + 0,010
V ≤ 0,20 + 0,02
≤ 0,03 + 0,01
Ti
> 0,03 + 0,02
≤ 0,30 + 0,05
Cr
> 0,30 + 0,10
≤ 0,80 + 0,05
Ni
> 0,80 + 0,10
≤ 0,10 + 0,03
Mo
> 0,10 + 0,04
thermomechanical formed,
±0,04
weather ≤ 0,35
Cu thermomechanical formed, weather
+ 0,07
0,35 < Cu ≤ 0,55
quenched and tempered ≤ 0,50 + 0,05
thermomechanical formed,
+ 0,002
weather ≤ 0,025
N
quenched and tempered ≤ 0,020 + 0,001
Al
≥ 0,020 – 0,005
total
Permissible deviation of the
Permissible maximum content in product analysis from
Element
the cast analysis specified limits for the cast
analysis
% by mass % by mass
B ≤ 0,005 0 + 0,000 5
Zr ≤ 0,15 + 0,02
7.2 Mechanical properties
7.2.1 Under the inspection and testing conditions as specified in Clause 8 and in the delivery
condition as specified in 6.5 the mechanical properties of the finished hollow section shall conform to
the relevant requirements of Tables C.3, C.4, D.3, D.4 and E.3.
Any heat treatment at more than 580 °C could lead to a reduction in the mechanical properties of TMCR
sections and also hot finished sections not processed in the normalizing temperature range.
The following option can be specified by the purchaser at the time of enquiry and order:
Option 3.5 Longitudinal test pieces for the tensile test shall be taken from the centre of the corner, but
remote from the weld in welded sections, (see Annex F).
7.2.2 Another temperature as given in the Tables C.4, D.4 and E.3 may be agreed at the time of the
order.
If a Charpy test is performed at a lower temperature than specified in the standard and the impact
energy values obtained meet the requirements at the higher temperature, then the material is deemed
to conform to the standard and the test need not be repeated at the higher temperature.
The following option can be specified by the purchaser at the time of enquiry and order:
Option 3.6 Longitudinal test pieces for the impact test shall be taken from the centre of the corner, but
remote from the weld in welded sections, with the notch orientated through the material thickness.
7.2.3 Subject to limitations of 7.2.2:
a) the impact properties of structural hollow sections of steel qualities M, ML, Q, QL and QL1 shall be
verified;
b) the impact properties of structural hollow sections of steel quality J0 need not be verified unless
option 3.7 is specified by the purchaser at the time of enquiry and order.
Option 3.7 For products in quality J0 supplied with specific inspection and testing (see Option 3.12
and 3.13) the verification of the impact properties is specified.
7.2.4 The following requirement for fine grain steel hollow sections can be specified.
For fine grain steel hollow sections in thicknesses which do not permit impact test pieces of
width ≥ 5 mm to be taken, the ferritic grain size (see 6.3) shall be verified by the method as described in
EN ISO 643.
When aluminium is used as the grain refining element, the grain size requirement shall be deemed to be
fulfilled if the cast analysis shows the aluminium content to be ≥ than 0,020 % total aluminium or
alternatively ≥ 0,015 % soluble aluminium. In these cases, verification of the grain size is not required.
7.3 Technological properties
7.3.1 Weldability
The steels specified in this document are weldable as given in Annexes C to E. General requirements for
welding of the products in accordance with this document are given in EN 1011-1 and EN 1011-2.
NOTE 1 When welding hollow sections, as product thickness, strength level and CEV increase, the occurrence
of cold cracking in the welded zone forms the main risk. Cold cracking is caused by a combination of the following
factors:
— high levels of diffusible hydrogen in the weld metal;
— a brittle structure in the heat affected zone;
— significant tensile stress concentrations in the welded joint.
NOTE 2 By using guidelines, specified for example in EN 1011-1, EN 1011-2 or any other relevant welding
standard, the recommended welding conditions and the various welding ranges for the steel grades can be
determined. These will vary depending on the product thickness, the applied welding energy, the design
requirements, the electrode efficiency, the welding process and the weld metal properties.
7.3.2 Hot-dip-zinc coating
EN ISO 1461 should be used to specify coating requirements. EN ISO 14713-2 provides further
guidance, including information on the influence of various factors, including steel chemical
composition, on the coating formation.
Option 3.8 can be used to order steels with a chemical composition required for hot-dip-zinc coating.
When Option 3.8 is implemented, the purchaser and manufacturer shall agree a steel composition (cast
analysis) of silicon and phosphorous according to either
— Category A (or steels satisfying the formula Si ≤ 0,03 % and Si + 2,5 P ≤ 0,09 %); or
— Category B (limited to 0,14 % ≤ Si ≤ 0,25 %); or
— Category D (limited to 0,25 % < Si ≤ 0,35 %)
with required values as cited by the ranges given in EN ISO 14713-2:2009, Table 1, column 2.
Option 3.8 The chemical composition shall be suitable for hot dip zinc coating. If no additional
information is given the delivered category is at the discretion of the manufacturer.
NOTE EN ISO 14713-2:2009, Table 1 gives guidance on typical coating characteristics on the basis of the
surface composition of silicon and phosphorous associated with certain steel compositions.
The maximum carbon equivalent shall be increased by 0,02 or by 0,01 (see 7.1.2).
7.4 Product supply condition
7.4.1 The hollow sections shall have a smooth surface corresponding to the manufacturing method
used; bumps, cavities or shallow longitudinal grooves resulting from the manufacturing process are
permissible, provided the thickness is within tolerance, see EN 10210-2.
Surface imperfections may be removed by the manufacturer by grinding, provided that the thickness of
the hollow section after the repair is not less than the minimum permissible thickness in accordance
with EN 10210-2.
The presence of some mill scale from the hot finishing or heat treatment process is normal for these
products.
7.4.2 The ends of the hollow section shall be cut nominally square to the axis of the product.
7.4.3 Repair of the weld shall not be permitted for hollow sections manufactured by a welding
process except in the case of submerged arc welds.
7.4.4 For hollow sections, manufactured by either a seamless or welding process, repair of the body
by welding shall not be permitted unless otherwise specified. The conditions under which, and the
extent to which, welding repair to the body may be carried out shall be agreed between the
manufacturer and the purchaser.
Option 3.9 Weld repairs to the body of structural steel hollow sections are permitted.
7.4.5 Any permitted weld repairs shall be carried out by operators qualified in accordance with
EN ISO 9606-1. Welding procedures shall be issued in a written form and qualified in accordance with
EN ISO 15607, EN ISO 15609-1 and EN ISO 15614-1.
A hollow section repaired in this way shall be considered to meet all the requirements of this document.
7.4.6 For SAW helical hollow sections where strip/plate was joined together these butt welds shall be
carried out by operators qualified in accordance with EN ISO 9606-1. Welding procedures shall be
issued in a written form and qualified in accordance with EN ISO 15614-1.
7.5 Non-destructive testing
The seam weld of all welded hollow sections supplied with specific inspection and testing shall be
subjected to an applicable non-destructive test in accordance with 10.4.1 to 10.4.3.
Option 3.10 If agreed at the time of enquiry and order, every circular hollow section shall be full
peripheral NDT-tested for imperfections according to one of the following standards: EN ISO 10893-2,
EN ISO 10893-3 or EN ISO 10893-10 (see 10.4.4).
NOTE Full peripheral NDT is not possible for elliptical, square, rectangular and SAW hollow sections.
Option 3.11 If agreed at the time of enquiry and order, every circular hollow section shall be tested for
laminar imperfections according to EN ISO 10893-8 or for welded tubes testing is also possible prior to
welding according to EN ISO 10893-9 or EN 10160 (see 10.4.5).
7.6 Tolerances and mass
7.6.1 Tolerances on dimensions and shape shall be as specified in EN 10210-2.
7.6.2 A density value of 7,85 kg/dm shall be used in mass calculations.
NOTE Dimensions, sectional properties and mass per unit length for a limited range of sizes of hot finished
structural hollow sections are given in EN 10210-2. It is preferable that the purchaser selects hollow section
dimensions from this limited range of sizes.
8 Inspection
8.1 Types of inspection
Products complying with this document shall, in accordance with EN 10021, be ordered and delivered
with an inspection document 2.2, 3.1 or 3.2 as specified in EN 10204. A test report 2.2 for steel grade
S355J0WH of Annex E and an inspection certificate 3.1 for all other steel grades of Annexes C to E shall
be issued.
Option 3.12 An inspection certificate 3.1 for steel grade S355J0WH of Annex E shall be.
Option 3.13 An inspection certificate 3.2 shall be issued.
8.2 Types and contents of inspection documents
8.2.1 For products supplied with non-specific inspection, a test report 2.2 in accordance with
EN 10204 shall be provided. The test report shall contain the following codes and relevant information
in accordance with EN 10168.
— A — Commercial transactions and parties involved;
— B — Description of products to which the test report applies;
— C10-C13 — Tensile test;
— C71-C92 — Cast analysis;
— Z — Validation.
8.2.2 For products supplied with an inspection certificate 3.1 or 3.2 following codes and relevant
information in accordance with EN 10168 shall be provided.
— 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;
— C71-C92 — Cast analysis and, if applicable, product analysis (as a minimum all the elements
referred to in Tables C.1, D.1 and E.1 as applicable and the CEV shall be reported);
— D02-D50 — If applicable, statement confirming that the NDT has been carried out and that the test
results are satisfactory;
— Z — Validation.
If an inspection certificate 3.2 is specified, 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.
8.3 Summary of inspection
The requirements for inspection are given in Tables 2 and 3.
Table 2 — Non-specific inspection for hot-finished hollow sections
for steel grade S355J0WH of Annex E
Inspection requirements Inspection programme
Subclause
Type of test Non-specific inspection
reference(s)
7.1 One result per
1 Cast analysis
10.1 delivery item
7.2 One representative result per
2 Tensile test
10.2.2 delivery item
Impact test for quality 7.2.1
3 Not applicable
Mandatory
J0 only 10.2.3
tests
Surface condition 7.4, 7.6
4 See 10.3
and dimensions 10.3
For welded products 7.5
5 Not applicable
NDT of the weld 10.4.2, 10.4.3
Tensile test in
7.2.1 One representative result per
6 corner region
10.2 delivery item
(Option 3.5)
Optional
tests
7 All other optional tests Not applicable
Table 3 — Specific inspection for hot-finished hollow sections
Inspection requirements Inspection programme
Subclause
Type of test Specific inspection
reference(s)
7.1
1 Cast analysis One per cast
10.1
7.2
a, b
2 Tensile test
One test per test unit
10.2.2
Impact test
One set of tests per
Mandatory 7.2.2
3 (not for steel
a, b
tests 10.2.3
test unit
grade of quality J0)
Surface condition and 7.4, 7.6
4 see 10.3
dimensions 10.3
For welded products 7.5
5 Full length
NDT of the weld 10.4.2, 10.4.3
Product analysis 7.1
6 One per cast
(Option 3.3) 10.1
Option 3.4 not available in this
7 - -
part
Tensile test in
a
8 corner region 7.2.1
One test per test unit
(Option 3.5)
Impact test in
a
Optional 9 corner region 7.2.2
One set of tests per test unit
tests (Option 3.6)
Impact test verification for
a,
7.2.3
One set of tests per test unit
10 quality J0
10.2
b
(Option 3.7)
Full peripheral NDT of the tube 7.5
11 Circular products, full length
(Option 3.10) 10.4.4
Ultrasonic inspection for
7.5
12 laminar imperfections Circular products, full length
10.4.5
(Option 3.11)
a
For test unit see 9.1.
b
Longitudinal or transverse samples at the discretion of the manufacturer.
9 Frequency of testing and preparation of samples and test pieces
9.1 Frequency of tests
The verification of the mechanical properties and product analysis, if applicable, shall be carried out by
a test unit. A test unit is defined as a quantity of hollow sections from one manufacturing lot of same
grade and sectional dimensions including hollow sections from one or more coils or bars or ingots
originating from one or more casts and, if applicable, in the same heat treatment condition, submitted
for acceptance at the same time.
The following samples shall be taken from one sample product of each test unit:
— 1 for tensile testing;
— 1 sufficient for 2 sets of 3 impact test pieces;
The mass of a test unit shall not exceed the maximum tonnage of sections specified in Table 4.
Table 4 — Test units
Type of hollow section
Circular Square, rectangular or Test unit
elliptical
max. mass
Outside diameter D External perimeter
t
mm mm
≤ 114,3 ≤ 400 40
> 114,3 ≤ 323,9 > 400 ≤ 800 50
> 323,9 > 800 75
9.2 Selection and preparation of samples for product analysis
Samples for product analysis, when required shall be taken from the sample product or alternatively
from samples used for mechanical testing or from the full thickness of the hollow section at the same
location as for the mechanical test samples. The selection and preparation of samples shall be in
accordance with EN ISO 14284.
9.3 Location and orientation of samples for the mechanical tests
9.3.1 Tensile test pieces
The test pieces for tensile testing shall conform to the following:
a) the test piece may be the full section of the product;
b) for circular or elliptical sections, not tested in full section, the test pieces shall be taken either
longitudinally or transversely, at the discretion of the manufacturer, and, for welded sections, at a
point remote from the weld (see Annex F);
c) for square or rectangular sections, not tested in full section, the test pieces shall be taken either
longitudinally or transversely, at the discretion of the manufacturer, midway between the corners,
and, for welded sections, from one of the sides not containing the weld (see Annex F).
9.3.2 Impact test pieces
Test pieces for impact testing shall conform to the following:
a) for circular or elliptical sections the test pieces shall be taken either longitudinally or transversely,
at the discretion of the manufacturer, and, for welded sections, at a point remote from the weld (see
Annex F);
b) for square or rectangular sections the test pieces shall be taken either longitudinally or
transversely, at the discretion of the manufacturer, midway
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...