SIST EN 10305-3:2024
(Main)Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
This document specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section with specified outside diameter D ≤ 193,7 mm and of square and of rectangular cross section for precision applications.
This document can also be applied to welded cold sized tube with other cross section shapes.
Tubes according to this document are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness. Typical fields of application are in the automotive, furniture and general engineering industries.
Präzisionsstahlrohre - Technische Lieferbedingungen - Teil 3: Geschweißte maßgewalzte Rohre
Dieses Dokument legt die technischen Lieferbedingungen für geschweißte, maßgewalzte Präzisionsstahlrohre mit einem kreisförmigen Querschnitt bei einem Nennaußendurchmesser D ≤ 193,7 mm und mit quadratischem und rechteckigem Querschnitt fest.
Dieses Dokument kann auch auf geschweißte maßgewalzte Rohre mit einem anderen Querschnitt angewendet werden.
Rohre nach diesem Dokument sind durch genau definierte Grenzabmaße und eine festgelegte maxi¬male Oberflächenrauheit charakterisiert. Typische Anwendungsgebiete sind der Fahrzeugbau, die Möbel-industrie und der Maschinenbau allgemein.
Tubes de précision en acier - Conditions techniques de livraison - Partie 3 : Tubes soudés calibrés à froid
Le présent document spécifie les conditions techniques de livraison des tubes en acier soudés calibrés à froid, de section circulaire, avec un diamètre extérieur spécifié D ≤ 193,7 mm et de section carrée et de section rectangulaire pour des applications de précision.
Le présent document peut également s'appliquer aux tubes soudés calibrés à froid ayant d'autres formes de section transversale.
Les tubes conformes au présent document se caractérisent par des tolérances dimensionnelles précises et par une rugosité maximale spécifiée. Les domaines typiques d'application se situent dans le secteur automobile, l'ameublement et l'ingénierie générale.
Jeklene cevi za precizno uporabo - Tehnični dobavni pogoji - 3. del: Varjene hladno oblikovane cevi
Ta dokument določa tehnične dobavne pogoje za varjene in hladno dimenzionirane cevi s krožnim prečnim prerezom z določenim zunanjim premerom D ≤ 193,7 mm in kvadratnim in pravokotnim prečnim prerezom za precizno uporabo. Ta dokument se lahko uporablja tudi za varjene in hladno dimenzionirane cevi z drugimi oblikami prečnih prerezov. Cevi v skladu s tem dokumentom imajo natančno opredeljene tolerance za mere in določeno največjo površinsko hrapavost. Tipična področja uporabe so v avtomobilski in pohištveni industriji ter v splošnem inženirstvu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2024
Jeklene cevi za precizno uporabo - Tehnični dobavni pogoji - 3. del: Varjene
hladno oblikovane cevi
Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded
cold sized tubes
Präzisionsstahlrohre - Technische Lieferbedingungen - Teil 3: Geschweißte
maßgewalzte Rohre
Tubes de précision en acier - Conditions techniques de livraison - Partie 3 : Tubes
soudés calibrés à froid
Ta slovenski standard je istoveten z: EN 10305-3:2023
ICS:
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 10305-3
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 77.140.75 Supersedes EN 10305-3:2016, EN 10305-5:2016
English Version
Steel tubes for precision applications - Technical delivery
conditions - Part 3: Welded cold sized tubes
Tubes de précision en acier - Conditions techniques de Präzisionsstahlrohre - Technische Lieferbedingungen -
livraison - Partie 3 : Tubes soudés calibrés à froid Teil 3: Geschweißte maßgewalzte Rohre
This European Standard was approved by CEN on 8 October 2023.
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10305-3:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols. 8
5 Classification and designation . 8
5.1 Classification . 8
5.2 Designation . 8
6 Information to be supplied by the purchaser . 9
6.1 Mandatory information . 9
6.2 Options . 9
6.3 Examples of orders . 10
7 Manufacturing process . 11
7.1 Steelmaking process . 11
7.2 Tube manufacture, surface conditions and delivery conditions . 11
8 Requirements . 12
8.1 General . 12
8.2 Chemical composition . 12
8.3 Mechanical properties . 14
8.4 Appearance and internal soundness . 16
8.5 Dimensions and tolerances . 18
8.5.1 Circular tubes . 18
8.5.2 Square and rectangular tubes . 20
8.5.3 Tubes of other shapes . 24
8.5.4 Lengths . 24
8.5.5 Straightness . 25
8.5.6 Preparation of tube ends. 25
9 Inspection . 25
9.1 Types of inspection . 25
9.2 Inspection documents . 26
9.2.1 Types of inspection documents . 26
9.2.2 Content of inspection documents . 26
9.3 Summary of inspection and testing . 27
10 Sampling . 27
10.1 Test unit. 27
10.2 Preparation of samples and test pieces . 28
10.2.1 Selection and preparation of samples for product analysis . 28
10.2.2 Location, orientation and preparation of samples and test pieces for mechanical tests
............................................................................................................................................................................. 28
10.2.3 Test pieces for roughness measurement . 29
11 Test methods . 29
11.1 Chemical analysis . 29
11.2 Tensile test . 29
11.3 Flattening test . 30
11.4 Drift expanding test . 31
11.5 Dimensional inspection . 32
11.6 Roughness measurement . 32
11.7 Visual examination . 32
11.8 Non-destructive testing . 32
11.8.1 Testing for longitudinal imperfections . 32
11.8.2 Leak-tightness . 32
11.8.3 Testing of transverse strip end welds of coiled tubing for imperfections . 32
11.9 Retests, sorting and reprocessing . 32
12 Marking . 33
13 Protection and packaging . 33
Annex A (informative) Available options in the EN 10305 series . 34
Annex B (informative) Other innovative steel tubes available in the market - Single-phase
ferrite microstructure strengthened with nano-precipitates . 36
Bibliography . 38
European foreword
This document (EN 10305-3:2023) has been prepared by Technical Committee CEN/TC 459/SC 10 “Steel
tubes, and iron and steel fittings”, the secretariat of which is held by UNI.
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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
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 supersedes EN 10305-3:2016 and EN 10305-5:2016.
In comparison with the previous edition EN 10305-3:2016 and EN 10305-5:2016, the following technical
changes have been made:
a) parts 3 and 5 have been merged so as to cover welded cold sized tubes of all shapes;
b) the dimensions, thickness ranges and tolerances have been aligned;
c) additional steel grades have been added;
d) editorial updates.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the United
Kingdom.
Introduction
The European Organization for Standardization (CEN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of patents applied to two new steel grades described
in the informative Annex B of this document. CEN takes no position concerning the evidence, validity and
scope of these patent rights.
The holder of these patent rights has ensured CEN that they are willing to negotiate licenses, under
reasonable and non-discriminatory terms and conditions, with applicants throughout the world. In this
respect, the statements of the holders of these patent rights are registered with CEN.
Information may be obtained from:
Grade HXT800NT and HXT1000NT
Tata Steel Nederland Tubes B.V.
4903RH Oosterhout, the Netherlands
EN 10305, Steel tubes for precision applications - Technical delivery conditions consists of the following
parts:
— Part 1: Seamless cold drawn tubes
— Part 2: Welded cold drawn tubes
— Part 3: Welded cold sized tubes
— Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems
— Part 6: Welded cold drawn tubes for hydraulic and pneumatic power systems
1 Scope
This document specifies the technical delivery conditions for welded cold sized steel tubes of circular
cross section with specified outside diameter D ≤ 193,7 mm and of square and of rectangular cross
section for precision applications.
This document can also be applied to welded cold sized tube with other cross section shapes.
Tubes according to this document are characterized by having precisely defined tolerances on
dimensions and a specified maximum surface roughness. Typical fields of application are in the
automotive, furniture and general engineering industries.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 10020:2000, Definition and classification of grades of steel
EN 10021:2006, 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 10168, Steel products — Inspection documents — List of information and description
EN 10204, Metallic products — Types of inspection documents
EN 10266:2003, Steel tubes, fittings and structural hollow sections — Symbols and definitions of terms for
use in product standards
CEN/TR 10261, Iron and steel — European standards for the determination of chemical composition
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 4885:2018, Ferrous materials — Heat treatments — Vocabulary (ISO 4885:2018)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1)
EN ISO 8492, Metallic materials — Tube — Flattening test (ISO 8492)
EN ISO 8493, Metallic materials — Tube — Drift-expanding test (ISO 8493)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
EN ISO 10893-1, Non-destructive testing of steel tubes — Part 1: Automated electromagnetic testing of
seamless and welded (except submerged arc-welded) steel tubes for the verification of hydraulic
leaktightness (ISO 10893-1)
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 10893-10, 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, Zinc coatings — Guidelines and recommendations for the protection against corrosion of
iron and steel in structures — Part 2: Hot dip galvanizing (ISO 14713-2)
EN ISO 21920-2, Geometrical product specifications (GPS) — Surface texture Profile — Part 2: Terms,
definitions and surface texture parameters (ISO 21920-2)
ISO 11484, Steel products — Employer's qualification system for non-destructive testing (NDT) personnel
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000, EN 10021:2006,
EN 10266:2003, EN ISO 4885:2018 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
employer
organization for which a person works on a regular basis
Note 1 to entry: The employer may be either the tube manufacturer or a third party organization providing
services, such as non-destructive testing (NDT).
3.2
manufacturer
party to produce and to deliver tubes in accordance with this document
Note 1 to entry: Where tubes are delivered through an intermediary, see EN 10021:2006, Clause 6.
3.3
imperfection
discontinuity in the wall or on the tube surfaces detectable by methods described in this document
Note 1 to entry: Imperfections with a size complying with the acceptance criteria specified in this document are
considered to have no practical implication on the intended use of the product.
3.4
defect
imperfection of a size not complying with the acceptance criteria specified in this document
Note 1 to entry: Defects are considered to adversely affect or limit the intended use of the product.
3.5
parent coil
coil originating from the hot rolling process prior to any subsequent operation (pickling, slitting, cold
rolling or coating)
4 Symbols
For the purposes of this document, the symbols in EN 10266:2003 apply.
5 Classification and designation
5.1 Classification
In accordance with the classification system in EN 10020 the steel grades given in Table 2 are non-alloy
quality steels except steel grades E700, HXT450XT, HXT490XT, HXT590XT, HXT780XT, HXT980XT,
HXT590CT, HXT780CT and HXT980CT, which are alloy quality steels.
5.2 Designation
For the tubes covered by this document the steel designation shall consist of the number of this document
(EN 10305-3) plus either:
a) the steel name in accordance with EN 10027-1:2016, with the exceptions indicated below; or
b) the steel number in accordance with EN 10027-2.
In this document three steel naming conventions are used:
Ennn E - engineering steel
nnn - specified minimum yield strength in MPa for the smallest thickness range
HXTnnnXT H – tubes of high strength steel for cold forming
XTnnn – product where the rolling condition is not specified followed by specified
minimum tensile strength in MPa
X – dual phase
T – tubular product
HXTnnnCT H – tubes of high strength steel for cold forming
XTnnn – product where the rolling condition is not specified followed by specified
minimum tensile strength in MPa
C – complex phase
T – tubular product
6 Information to be supplied by the purchaser
6.1 Mandatory information
The following information shall be supplied at the time of enquiry and order:
a) the quantity (mass or total length or number of tubes);
b) the term “Cold sized steel tube of circular shape, square shape, rectangular shape or other shape”;
c) the dimensions (see 8.5) and, if applicable, the tolerances (see 8.5.2.4 and 8.5.3);
d) the tube length and tolerance (see 8.5.4);
e) the steel designation (see 5.2);
f) the delivery condition and surface condition (see 7.2.2 and 7.2.3);
g) type of inspection document (see 9.1).
6.2 Options
A number of options are specified in this document and these are listed below. 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 tubes shall be supplied in accordance with the basic specification (see 6.1).
• Option 1: specification of a steel grade not specified in this document (see 8.2);
• Option 3: suitability for hot-dip galvanizing (see 8.2);
• Option 4: surface condition for further processing (see 8.4.1);
• Option 5: position of the weld line on square and rectangular tubes (see 8.4.2), and tubes of other
shapes (see 8.5.3);
• Option 6: removal of internal weld bead or restriction of bead height (see 8.4.3);
• Option 8: measurement of surface roughness (see 8.4.5);
• Option 9: specific surface roughness (see 8.4.5);
• Option 11: NDT of the weld seam for the detection of longitudinal imperfections (see 8.4.8);
• Option 12: NDT of circular tubes for the detection of longitudinal imperfections (see 8.4.8;)
• Option 13: NDT of circular tubes for verification of leak-tightness (see 8.4.8);
• Option 14: specification of a procedure to test transverse strip welds in coiled tubing for the detection
of imperfections (see 8.4.9);
• Option 15: specification of a cross section other than circular, square or rectangular, including
tolerances (see 8.5.3);
• Option 16: reduced diameter tolerances for circular tubes (see 8.5.1.2) or reduced side length
tolerances for square or rectangular tubes (see 8.5.2.4);
• Option 19: reduced wall thickness tolerance (see 8.5.1.3 or 8.5.2.5 or 8.5.3.2);
• Option 20: unilateral wall thickness tolerance (see 8.5.1.3 or 8.5.2.5 or 8.5.3.2);
• Option 21: another length and/or tolerance is specified (see 8.5.4);
• Option 22: reduced maximum deviation from straightness (see 8.5.5.1 or 8.5.5.2);
• Option 23: specified end finishing (see 8.5.6);
• Option 25: flattening or drift expanding test for circular tubes (see Table 10);
• Option 26: test unit with tubes from one cast only (see 10.1);
• Option 27: an alternative value for the flattening distance H is specified by the purchaser (see 11.3);
• Option 28: alternative marking (see Clause 12);
• Option 29: delivery without corrosion protection (see 13.1);
• Option 30: specified corrosion protection (see 13.1);
• Option 38: unbundled tubes or specific method of packaging (see 13.2);
• Option 39: a product analysis for the tubes shall be supplied (see 8.2);
• Option 40: alternative corner radius specified for square or rectangular tubes (see 8.5.2.6).
NOTE The numbering of the options is the same throughout the EN 10305 series. The options not listed in this
document are not relevant for the products covered. See for information Annex A for all options of the EN 10305
series.
6.3 Examples of orders
a) Circular tube
12 000 m tube with an outside diameter of D = 40 mm and a wall thickness of T = 1,5 mm in standard
lengths of 6 m with tolerance of +50 mm −0 mm in accordance with EN 10305-3, to be delivered made of
steel grade E235 in the normalized condition, with surface condition S2, pickled, with a 3.1 inspection
certificate in accordance with EN 10204:
12 000 m tubes – D 40 x T 1,5 – standard length - EN 10305-3 –E235+N – S2 - inspection certificate 3.1
b) Rectangular tube
12 000 m tube, size H = 50 mm × B = 30 mm with a wall thickness of T = 3 mm in standard lengths of 6 m
with tolerance of +50 mm −0 mm in accordance with EN 10305-3, to be delivered made of steel grade
E355 in the normalized condition with surface condition S2, pickled, with a 3.1 inspection certificate in
accordance with EN 10204:
12 000 m tubes – H 50 × B 30 × T 3 – standard length - EN 10305-3 – E355+N – S2 - inspection certificate
3.1
7 Manufacturing process
7.1 Steelmaking process
The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth
(Siemens-Martin) process shall not be employed.
Steels shall be fully killed.
NOTE This excludes the use of rimming, balanced or semi-killed steel.
7.2 Tube manufacture, surface conditions and delivery conditions
7.2.1 The tubes shall be manufactured from strip by high frequency electric welding. The tubes shall
not contain strip end welds, except for circular tubes to be supplied coiled for which the delivery
conditions +A or +N (see Table 1) shall be specified.
7.2.2 Possible surface conditions are:
a) S1 (black);
b) S2 (pickled);
c) S3 (cold rolled);
d) S4 (coated to an agreed condition).
The surface conditions S1 and S3 apply only to the strip whereas surface conditions S2 and S4 may apply
to the strip or the tube; the purchaser should, where necessary, indicate the required surface condition
at the time of enquiry and order.
7.2.3 Tubes made from steel grades E155, E195, E235, E275 and E355 shall be supplied in the delivery
condition +CR1 or +A or +N (see Table 1 and Table 4). Tubes made from steel grades E190, E220, E260,
E320, E370, E460, E500, E550, E600, E700, HXT450XT, HXT490XT, HXT590XT, HXT780XT, HXT980XT,
HXT590CT, HXT780CT and HXT980CT shall be supplied in the delivery condition +CR2 (see Table 1 and
Table 5). Tubes made from steel grade E420 shall be supplied in the delivery condition +N (see Table 1
and Table 4) or +CR2 (see Table 1 and Table 5).
7.2.4 All non-destructive testing (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 EN ISO 9712.
It is recommended that the level 3 personnel be certified in accordance with EN ISO 9712.
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.
Table 1 — Delivery conditions
Designation a Description
Symbol
Welded and cold sized Normally not heat treated after welding and
sizing, but suitable for final annealing or
+CR1
b
normalising.
Not intended for heat treatment after welding
+CR2
c
and sizing.
Soft annealed After welding and sizing the tubes are annealed
+A
in a controlled atmosphere.
Normalized After welding and sizing the tubes are
+N
normalized in a controlled atmosphere.
a
In accordance with EN 10027-1.
b
After annealing or normalizing, the resulting mechanical properties do not necessarily have to meet the
requirements specified in Table 4 for the delivery condition +A or +N, respectively.
c
If further heat treatment is applied, the resulting mechanical properties may be outside the requirements specified
in Table 4.
8 Requirements
8.1 General
Tubes are considered to comply with the requirements of this document, when supplied in a delivery
condition indicated in Table 1 and inspected in accordance with Clauses 9, 10 and 11.
In addition, the general technical delivery requirements specified in EN 10021 apply.
8.2 Chemical composition
The cast analysis reported by the steel producer shall apply and shall comply with the requirements of
Table 2. Table 3 specifies the permissible deviation of product analysis from the specified limits on cast
analysis given in Table 2. In case of a specified product analysis, the permissible deviations of Table 3 also
apply.
NOTE 1 When subsequently welding tubes produced in accordance with this document, it is important to take
account of the fact that the behaviour of the steel during and after welding is dependent not only on the steel
composition and the delivery condition but also on the welding process used and the conditions of preparing for
and carrying out the welding.
A steel grade not specified in this document may be specified (see Option 1).
Option 1: A steel grade not specified in this document, and agreed chemical composition, mechanical
properties and delivery condition, is specified.
Where the steel grade specified is a strip grade, the mechanical properties of the tube can be considerably
different to those of the strip. Accordingly, in such cases, mechanical properties for the tube should be
agreed between the manufacturer and purchaser at the time of enquiry and order.
Where tubes suitable for hot dip galvanizing are required, Option 3 should be specified by the purchaser.
Option 3: A chemical composition of the steel grade required for batch hot dip galvanizing is specified by
the purchaser according to one of the categories in EN ISO 14713-2.
NOTE 2 Further guidance can be found in EN ISO 1461.
Option 39: A product analysis for the tubes shall be supplied.
Table 2 — Chemical composition (cast analysis)
Steel grade a
in % by mass
Steel Steel C Si Mn P S b Cr + Nb + V B
Al
total
name number Mo Ti
min.
E155 1.0033 0,11
0,35 0,70 0,025 0,025 0,015
E190 1.0031 0,10
E195 1.0034 0,15
0,35 0,70 0,025 0,025 0,015
E220 1.0215 0,14
E235 1.0308 0,17
0,35 1,20 0,025 0,025 0,015
E260 1.0220 0,16
E275 1.0225 0,21
0,35 1,40 0,025 0,025 0,015
E320 1.0237 0,20
E355 1.0580 0,22
0,55 1,60 0,025 0,025 0,020
E370 1.0261 0,21
d
1.0575 0,16
E420
0,55 1,70 0,025 0,025 0,020
E460 1.0435 0,16
E500 1.0519 0,16 0,55 1,70 0,025 0,025 0,020
E550 1.0593 0,16 0,55 1,80 0,025 0,025 0,020
E600 1.0595 0,16 0,60 1,80 0,025 0,025 0,020
E700 1.0987 0,16 0,60 2,10 0,025 0,025 0,020
Dual-phase steels (X)
HXT450XT 1.9901 0,14 0,75 2,00 0,080 0,015 0,015 1,00 0,15 0,20 0,005
HXT490XT 1.9903 0,14 0,75 2,00 0,080 0,015 0,015 1,00 0,15 0,20 0,005
c 1,40 0,15 0,20 0,005
HXT590XT 1.9905 0,15 2,50 0,080 0,015 0,015
0,80
c 1,40 0,15 0,20 0,005
HXT780XT 1.9907 0,18 2,50 0,080 0,015 0,015
0,80
HXT980XT 1.9909 0,20 1,00 2,90 0,080 0,015 0,015 1,40 0,15 0,20 0,005
Complex-phase steels (C)
HXT590CT 1.9911 0,18 0,80 2,20 0,080 0,015 0,015 1,00 0,15 0,20 0,005
HXT780CT 1.9913 0,18 1,00 2,50 0,080 0,015 0,015 1,00 0,15 0,20 0,005
HXT980CT 1.9915 0,23 1,00 2,70 0,080 0,015 0,015 1,00 0,25 0,22 0,005
b
Elements not quoted in this table (but see footnote ) shall not be intentionally added to the steel without the agreement
of the purchaser, other than for the purpose of finishing the heat. All appropriate measures shall be taken to prevent the
addition of undesirable elements from scrap or other materials used in the steel making process.
a
Maximum values unless otherwise indicated.
b
This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements,
such as Ti, Nb or V. If added, the content of these elements shall be reported in the inspection document.
c
Maximum silicon content 1,00 % for hot rolled steel grade.
d
For the delivery condition +N the values (%) can be extended to C= 0,23; Si=0,60; Mn=1,90; Al min.=0,01.
total
Table 3 — Permissible deviations of the product analysis from the specified limits on cast
analysis given in Table 2
Limiting value for Permissible deviation of
cast analysis in the product analysis
Element accordance with
Table 2 % by mass
% by mass
C ≤ 0,23 +0,02
Si ≤ 0,80 +0,05
> 0,80 to ≤ 1,00 +0,10
Mn ≤ 2,50 +0,10
> 2,50 to ≤ 2,90 +0,12
P ≤ 0,025 +0,005
> 0,025 to ≤ 0,080 +0,10
S ≤ 0,015 +0,003
> 0,015 to ≤ 0,025 +0,005
Al ≥ 0,015 -0,005
8.3 Mechanical properties
The mechanical properties of the tubes shall conform to the requirements of Tables 4 and 5 and, where
specified, to Option 25.
Subsequent processing (cold or hot) may change the mechanical properties.
Table 4 — Mechanical properties at room temperature for the delivery
conditions +CR1, +A and +N
a
Minimum values for the delivery conditions
Steel grade
b d
+A +N
+CR1
c
R R R
A A R A
Steel Steel m m m
eH
name number
% % %
MPa MPa MPa
MPa
E155 1.0033 290 15 260 28 270 to 410 155 28
E195 1.0034 330 8 290 28 300 to 440 195 28
E235 1.0308 390 7 315 25 340 to 480 235 25
E275 1.0225 440 6 390 22 410 to 550 275 22
E355 1.0580 540 5 450 22 490 to 630 355 22
E420 1.0575 - - - - 490 to 700 420 18
NOTE The mechanical properties of the weld zone can, in the case of the delivery
conditions +CR1 and +A, differ from that of the base material.
a
R : tensile strength; R : upper yield strength (but see 11.2); A: elongation after
m eH
fracture. For symbols for the delivery conditions, see Table 1.
b
For some strip grades, the degree of cold forming and the sizing of the as welded tube,
may result in the yield strength being nearly be as high as the tensile strength. For calculation
purposes yield strength values of R ≥ 0,7 R are recommended for the +CR1 condition.
eH m
c
For tubes with outside diameter ≤ 30 mm and wall thickness ≤ 3 mm the specified R
eH
minimum values can be 10 MPa lower than the values given in this table.
d
The condition +CR2 may be specified with the same mechanical properties.
Table 5 — Mechanical properties at room temperature for the delivery condition +CR2
a
Minimum values for the delivery condition
Steel grade
+CR2
R R
A
Steel m eH
Steel name
number
%
MPa MPa
E190 1.0031 270 190 26
E220 1.0215 310 220 23
E260 1.0220 340 260 21
E320 1.0237 410 320 19
E370 1.0261 450 370 15
E420 1.0575 490 420 12
E460 1.0435 510 460 9
E500 1.0519 540 500 8
E550 1.0593 590 550 7
E600 1.0595 640 600 6
E700 1.0987 740 700 5
Dual-phase steels (X)
HXT450XT 1.9901 450 260 17
HXT490XT 1.9903 490 290 14
HXT590XT 1.9905 590 330 9
HXT780XT 1.9907 780 440 8
HXT980XT 1.9909 980 590 5
Complex-phase steels (C)
b
HXT590CT 1.9911 350 11
c
HXT780CT 1.9913 570 5
HXT980CT 1.9915 980 780 2
NOTE The mechanical properties of the weld zone can differ from that of the base material.
a
R : tensile strength; R : upper yield strength (but see 11.2); A: elongation after fracture. For the
m eH
symbol for the delivery condition, see Table 1.
b
For hot rolled steel grade: 580MPa.
c
For hot rolled steel grade: 760MPa.
8.4 Appearance and internal soundness
8.4.1 The internal and external surface finish of the tubes shall be typical of the manufacturing process
and, where applicable, the heat treatment employed. Tubes in the delivery condition +A or +N shall be
free of loose scale but may show discoloration.
Normally, the finish and surface condition shall be made in a skilful, diligent and professional manner,
such that any surface imperfections requiring dressing can be identified. Any surface imperfections,
which, in accordance with the manufacturer's experience, might be considered defects as specified in
8.4.6, shall be dressed in accordance with 8.4.7, or the tube or part of the tube shall be rejected.
Where a particular surface condition is required by the purchaser, Option 4 should be specified.
Option 4: A surface condition suitable for special further processing is specified by the purchaser.
8.4.2 For cross sections other than circular, including square or rectangular tubes, the position of the
weld line is at the discretion of the manufacturer, unless Option 5 is specified by the purchaser.
Option 5: The position of the weld line, a) or b) or c) or d), is specified by the purchaser. The deviation of
the weld line from a specified position shall be:
a) narrow side (from the centre line): ± 10 % of side length or ± 4 mm whichever is the greater;
b) wide side (from the centre line): ± 10 % of side length or ± 4 mm whichever is the greater;
c) corner: the weld shall be within the corner radius defined by C and C (see Figure 1);
1 2
d) any other position: agreed tolerance.
8.4.3 The external weld bead shall be removed flush with the surface. The height of the internal weld
is not limited, unless Option 6 is specified by the purchaser.
Option 6: The internal weld bead shall either be removed or its height shall not exceed an agreed specified
value.
Where Option 6 is applied, the wall thickness in the weld area shall not be less than the minimum wall
thickness specified in 8.5.1.3, 8.5.2.5 or 8.5.3.
8.4.4 Outside the weld area, the roughness on the outside surface shall be: Ra ≤ 4 µm.
8.4.5 Measurement of surface roughness and/or improved levels of roughness may be specified by the
purchaser (see Options 8 and 9).
Option 8: The surface roughness shall be measured in accordance with 11.6 and reported.
Option 9: A specific surface roughness of agreed type and limiting value is specified. The roughness shall be
measured in accordance with 11.6 and reported.
8.4.6 Surface imperfections which encroach on the specified minimum wall thickness shall be
considered defects and tubes containing these shall be deemed not to conform to this document.
8.4.7 It shall be permissible to dress, only by grinding or machining, surface imperfections provided
that, after doing so, the wall thickness in the dressed area is not less than the specified minimum wall
thickness. All dressed areas shall blend smoothly into the contour of the tube.
8.4.8 Verification of weld integrity or internal soundness by NDT may be specified by the purchaser
(see Options 11 to 13).
NOTE Options 12 and 13 can only be applied to round tubes.
Option 11: NDT of the weld seam for the detection of longitudinal imperfections shall be carried out in
accordance with 11.8.1.
Option 12: NDT of the full tube circumference for the detection of longitudinal imperfections shall be carried
out in accordance with 11.8.1.
Option 13: NDT for verification of leak tightness shall be carried out in accordance with 11.8.2.
8.4.9 Strip end welds on tubes to be supplied coiled shall be subjected to additional testing. The testing
method is left to the discretion of the manufacturer, unless Option 14 is specified by the purchaser.
Option 14: A testing procedure and acceptance criteria for the detection of imperfections in transverse
welds shall be agreed.
8.5 Dimensions and tolerances
8.5.1 Circular tubes
8.5.1.1 Circular tubes shall be specified by outside diameter and wall thickness.
8.5.1.2 Preferred diameters, wall thicknesses and masses per unit length, are given in Table 6. The
diameter tolerances given in Table 6 apply only to tubes in delivery conditions +CR1 and +CR2.
Depending on the ratio of wall thickness to diameter, the diameter tolerances of heat treated tubes in
delivery condition +A and +N are given by consideration of the corrective factors in Table 7.
The diameter tolerances include the out-of-roundness. For intermediate sizes, the tolerances applicable
to the next larger size shall apply. For a maximum distance of 100 mm, the tube ends may, due to the
cutting method, have diameters outside the specified tolerances.
Other diameter tolerances may also be specified by the purchaser (see Option 16).
Option 16: Reduced diameter tolerance is specified.
Table 6 — Sizes and diameter tolerances for circular tubes
Dimensions in millimetres
Wall thickness T (mm)
Outside diameter D
0,6 0,8 1 1,2 1,5 1,8 2 2,2 2,5 3 3,5 4 4,5 5 5,5 6
and tolerances
Mass per unit length (kg/m)
6 0,080 0,103 0,123
8 0,109 0,142 0,173 0,201 0,240
10 0,139 0,182 0,222 0,260 0,314
12 0,169 0,221 0,271 0,320 0,388 0,453 0,493
±0,12
15 0,213 0,280 0,345 0,408 0,499 0,586 0,641 0,694
16 0,228 0,300 0,370 0,438 0,536 0,630 0,691 0,749
18 0,257 0,339 0,419 0,497 0,610 0,719 0,789 0,857 0,956
19 0,272 0,359 0,444 0,527 0,647 0,764 0,838 0,911 1,02 1,18
20 0,287 0,379 0,469 0,556 0,684 0,808 0,888 0,966 1,08 1,26
22 0,317 0,418 0,518 0,616 0,758 0,897 0,986 1,07 1,20 1,41
25 ±0,15 0,361 0,477 0,592 0,704 0,869 1,03 1,13 1,24 1,39 1,63
28 0,405 0,537 0,666 0,793 0,980 1,16 1,28 1,40 1,57 1,85 2,11
30 0,435 0,576 0,715 0,852 1,05 1,25 1,38 1,51 1,70 2,00 2,29
Wall thickness T (mm)
Outside diameter D
0,6 0,8 1 1,2 1,5 1,8 2 2,2 2,5 3 3,5 4 4,5 5 5,5 6
and tolerances
Mass per unit length (kg/m)
32 0,616 0,765 0,911 1,13 1,34 1,48 1,62 1,82 2,15 2,46
35 0,838 1,00 1,24 1,47 1,63 1,78 2,00 2,37 2,72
38 0,912 1,09 1,35 1,61 1,78 1,94 2,19 2,59 2,98 3,35
±0,20
40 0,962 1,15 1,42 1,70 1,87 2,05 2,31 2,74 3,15 3,55
...
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