kSIST FprEN 10305-3:2023
(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 may 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 Nenndurchmesser 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
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 10305-3:2022
01-maj-2022
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: prEN 10305-3
ICS:
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
oSIST prEN 10305-3:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 10305-3:2022
DRAFT
EUROPEAN STANDARD
prEN 10305-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2022
ICS 77.140.75 Will supersede 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 Präzisionsstahlrohre - Technische Lieferbedingungen -
de livraison - Partie 3: Tubes soudés calibrés à froid Teil 3: Geschweißte maßgewalzte Rohre
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 10.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10305-3:2022 E
worldwide for CEN national Members.
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Contents
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols . 7
5 Designation. 7
5.1 Classification . 7
5.2 Designation. 7
6 Information to be supplied by the purchaser . 8
6.1 Mandatory information . 8
6.2 Options . 8
6.3 Examples of orders . 9
7 Manufacturing process . 10
7.1 Steelmaking process . 10
7.2 Tube manufacture, surface conditions and delivery conditions . 10
8 Requirements . 11
8.1 General . 11
8.2 Chemical composition . 11
8.3 Mechanical properties . 13
8.4 Appearance and internal soundness. 15
8.5 Dimensions and tolerances . 16
8.5.1 Circular tubes . 16
8.5.2 Square and rectangular tubes . 18
8.5.3 Tubes of other shapes . 22
8.5.4 Lengths . 22
8.5.5 Straightness . 23
8.5.6 Preparation of tube ends . 24
9 Inspection . 24
9.1 Types of inspection . 24
9.2 Inspection documents . 24
9.2.1 Types of inspection documents. 24
9.2.2 Content of inspection documents . 25
9.3 Summary of inspection and testing . 26
10 Sampling . 27
10.1 Test unit . 27
10.2 Preparation of samples and test pieces . 27
10.2.1 Selection and preparation of samples for product analysis . 27
10.2.2 Location, orientation and preparation of samples and test pieces for mechanical
tests . 27
10.2.3 Test pieces for roughness measurement . 28
11 Test methods . 28
11.1 Chemical analysis . 28
11.2 Tensile test . 28
11.3 Flattening test . 29
11.4 Drift expanding test . 30
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11.5 Dimensional inspection . 31
11.6 Roughness measurement . 31
11.7 Visual examination . 31
11.8 Non-destructive testing . 31
11.8.1 Testing for longitudinal imperfections . 31
11.8.2 Leak-tightness . 31
11.8.3 Testing of transverse strip end welds of coiled tubing for imperfections . 31
11.9 Retests, sorting and reprocessing . 31
12 Marking . 32
13 Protection and packaging . 32
Annex A (informative) Table A.1 — Available options in the EN 10305 series . 33
Annex B (informative) Other innovative steel tubes available in the market . 35
B.1 Single-phase ferrite microstructure strengthened with nano-precipitates . 35
Bibliography . 37
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European foreword
This document (prEN 10305-3:2022) 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 document is currently submitted to CEN Enquiry
This document will supersede EN 10305-3:2016 and EN 10305-5:2016.
In comparison with the previous edition, 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.
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 standard.
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 5: -
— Part 6: Welded cold drawn tubes for hydraulic and pneumatic power systems
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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 may 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 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 10020:2000, Definition and classification of grades of steel
EN 10021:2006, General technical delivery conditions for steel products
EN 10027-1:2016, 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
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 4287, Geometrical product specifications (GPS) - Surface texture: Profile method - Terms, definitions
and surface texture parameters (ISO 4287)
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 9712:2012, Non-destructive testing - Qualification and certification of NDT personnel (ISO
9712:2012)
CEN/TR 10261, Iron and steel - European standards for the determination of chemical composition
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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 14713-2:2020, Zinc coatings - Guidelines and recommendations for the protection against corrosion
of iron and steel in structures - Part 2: Hot dip galvanizing (ISO 14713-2:2019)
ISO 11484, Steel products — Employer's qualification system for non-destructive testing (NDT) personnel
ASNT-TC-1A, Personnel Qualification and Certification in Non destructive Testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000, EN 10021:2007,
EN 10266:2003, EN ISO 4885: 2018 and the following apply.
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 10021:2007, section 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.
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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 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 consists 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 standard 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
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6 Information to be supplied by the purchaser
6.1 Mandatory information
The following information shall be supplied by the purchaser 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: non-destructive testing of the weld seam for the detection of longitudinal imperfections
(see 8.4.8);
• Option 12: non-destructive testing of circular tubes for the detection of longitudinal imperfections
(see 8.4.8;)
• Option 13: non-destructive testing 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);
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• 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 section 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
standard are not relevant for the products covered.
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:
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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 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 grades E190, E220, E260, E320,
E370, E420, 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).
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 ASNT TC-1A or EN ISO 9712.
It is recommended that the level 3 personnel be certified in accordance with EN ISO 9712 or ASTN TC-
1A.
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.
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Table 1 — Delivery conditions
a
Designation Symbol Description
Welded and cold sized Normally not heat treated after welding and
+CR1 sizing, but suitable for final annealing or
b
normalising.
Not intended for heat treatment after welding
+CR2
c
and sizing.
Soft annealed After welding and sizing the tubes are
+A
annealed 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 shall 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
...
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