oSIST prEN 10305-3:2022

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

• Status: Not Published
• Public Enquiry End Date: 19-Jun-2022
• ICS: 77.140.75 - Steel pipes and tubes for specific use
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 06-Apr-2022
• Due Date: 24-Aug-2022
• Completion Date: 23-Jun-2022
• Ref Project: FprEN 10305-3 - Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes

Relations

• Revised: SIST EN 10305-5:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 5: Welded cold sized square and rectangular tubes
• Effective Date: 18-Dec-2019
• Revised: SIST EN 10305-3:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
• Effective Date: 18-Dec-2019
• Revised: SIST EN 10305-3:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
• Effective Date: 18-Jan-2023
• Revised: SIST EN 10305-5:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 5: Welded cold sized square and rectangular tubes
• Effective Date: 18-Jan-2023
• Revised: SIST EN 10305-3:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
• Effective Date: 19-Jan-2023
• Revised: SIST EN 10305-5:2016 - Steel tubes for precision applications - Technical delivery conditions - Part 5: Welded cold sized square and rectangular tubes
• Effective Date: 19-Jan-2023

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
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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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oSIST prEN 10305-3:2022
prEN 10305-3:2022 (E)
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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oSIST prEN 10305-3:2022
prEN 10305-3:2022 (E)
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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oSIST prEN 10305-3:2022
prEN 10305-3:2022 (E)
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-

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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prEN 10305-3:2022 (E)

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
Designation Symbol Description
Welded and cold sized Normally not heat treated after welding and
+CR1 sizing, but suitable for final annealing or
normalising.
Not intended for heat treatment after welding
+CR2
and sizing.
Soft annealed After welding and sizing the tubes are
annealed in a controlled atmosphere.
Normalized After welding and sizing the tubes are
normalized in a controlled atmosphere.
In accordance with EN 10027-1.

After annealing or normalizing, the resulting mechanical properties shall meet the requirements

specified in Table 4 for the delivery condition +A or +N, respectively.

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
...