EN 10255:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Non-Alloy steel tubes suitable for welding and threading - Technical delivery conditionsSRJRMLTubes en acier non allié soudables et filetables - Conditions techniques de livraisonRohre aus unlegiertem Stahl mit Eignung zum Schweißen und Gewindeschneiden - Technische LieferbedingungenTa slovenski standard je istoveten z:EN 10255:2004SIST EN 10255:2004en23.040.10Železne in jeklene ceviIron and steel pipesICS:SLOVENSKI
STANDARDSIST EN 10255:200401-november-2004

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10255August 2004ICS 23.040.10English versionNon-Alloy steel tubes suitable for welding and threading -Technical delivery conditionsTubes en acier non allié soudables et filetables - Conditionstechniques de livraisonRohre aus unlegiertem Stahl mit Eignung zum Schweißenund Gewindeschneiden - Technische LieferbedingungenThis European Standard was approved by CEN on 27 May 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10255:2004: E

Correlation between specified outside diameter, thread size, and nominal diameter.14 Annex B (normative)
Types of tubes with wall thickness different from medium and heavy series.15 B.1 General.15 B.2 Requirements.15 B.3 Marking.15 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of the EC Construction Products Directive for applications covered by Mandate M 131.17 ZA.1 Scope and relevant characteristics.17 ZA.2 Procedure of attestation of conformity of pipes.18 ZA.3 Evaluation of Conformity.18

This European Standard has been derived, with modifications, from ISO 65 “Carbon steel tube suitable for screwing in accordance with ISO 7/1”. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

1 Scope This document specifies the requirements for circular non-alloy steel tubes suitable for welding and threading and provides a number of options for the finish of tube ends and coatings.
This document covers tubes of specified outside diameter 10,2 mm to 165,1 mm (thread size 1/8 to 6) in two series, medium and heavy, and three types of designated thicknesses. NOTE Tubes manufactured according to this document can be used for the conveyance of fluids as well as for other applications. 2 Normative references The following referenced documents are indispensable for the application 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. The requirements of this European Standard rule when they differ from those in the standards and documents referred to below: EN 10002-1, Metallic materials: Tensile testing - Part 1: Method of test at ambient temperature EN 10020, Definition and classification of grades of steel EN 10021, General technical delivery requirements for steel and iron products EN 10027-1, Designation systems for steel - Part 1: Steel names, principal symbols EN 10027-2, Designation systems for steels - Part 2: Numerical system EN 10204, Metallic products - Types of inspection documents EN 10232, Metallic materials - Tube (in full section) - Bend test EN 10233, Metallic materials - Tube - Flattening test EN 10240, Internal and/or external protective coatings for steel tubes - Specification for hot dip galvanized coatings applied in automatic plants EN 10241, Steel threaded pipe fittings EN 10242, Threaded pipe fittings in malleable cast iron EN 10246-1, Non destructive testing of steel tubes - Part 1: Automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness EN 10226-1 Pipe threads where pressure-tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and designation prEN 10226-2, Pipe threads where pressure-tight joints are made on the threads - Part 2: Taper external threads and taper internal threads - Dimensions, tolerances and designation EN 10266:2003, Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards

designation used in conjunction with the diameter to define the thickness and the mass per unit length of the tube 3.2 Bare tube tube whose surface is as manufactured without subsequent coating 4 Classification and designation The steel specified in this document is classified as a non-alloy quality steel in accordance with EN 10020. The steel name S195 T has been established in accordance with EN 10027-1. The steel number 1.0026… has been established in accordance with EN 10027-2. 5 Information to be supplied by the purchaser 5.1 Mandatory information The following information shall be supplied by the purchaser at the time of enquiry and order: a) Quantity (mass or total length or number of tubes); b) Seamless or Welded tube manufacturing process (S or W); c) The term “tube”; d) The number of this European Standard (EN 10255); e) Specified outside diameter (D) in millimetres or thread size (R) (see Table 2 or Annex B); f) Wall thickness (T) in millimetres or series (M or H) (see Table 2) or type (L or L1 or L2) (see Annex B). 5.2 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 5.1). 1) Threaded ends (see 7.2); 2) Tube with socket (see 7.2); 3) Socket type to be specified (see 7.2); 4) Closed ends to prevent ingress of foreign matter (see 7.2);

The tube ends shall be cut nominally square to the axis of the tube and shall be free from excessive burrs. 7.2 Alternative finishes and protection of the tube ends Alternative types of end finish may be obtained by selecting from the following options:

The socket shall be in accordance with EN 10241 or EN 10242 and unless Option 3 is requested the choice of standard and the socket type shall be at the discretion of the manufacturer.
The purchaser shall be informed to which standard and of which type of socket is to be supplied. Option 3: The purchaser shall specify the standard, and which type of socket is to be supplied in accordance with Option 2. NOTE Purchasers who require tubes to be threaded and supplied with a socket should specify either Options 1 and 2 or Options 1 and 3. Protection, to prevent ingress of foreign matter or physical damage or rusting of the threads, may be obtained by selecting from the following options: Option 4: One cap or plug fitted to each tube end to prevent ingress of foreign matter; the type is at the discretion of the manufacturer. Option 5: The tube shall be supplied with the thread varnished or with thread protection. The type of protection is at the discretion of the manufacturer. 7.3 Suitability for hot dip galvanizing Option 6: The tubes shall be suitable for galvanizing to EN ISO 1461 or to EN 10240 coating quality A.2, A.3, B.1, B.2 or B.3. Option 7: The tubes shall be suitable for galvanizing to EN 10240 coating quality A.1 (see 8.4.9). 7.4 Hot dip galvanized condition Option 8: The tubes shall be supplied galvanized according to EN ISO 1461. Option 9: The tubes shall be supplied galvanized according to EN 10240; the coating quality shall be specified by the purchaser at the time of enquiry and order. 8 Requirements 8.1 General The tubes when inspected in accordance with Clause 9 shall conform to the requirements of this document. In addition to the requirements of this document, the general technical delivery requirements specified in EN 10021 shall apply. 8.2 Chemical composition and mechanical properties 8.2.1 The chemical composition and the mechanical properties shall conform to the requirements of Table 1.

NOTE The steel specified in this document is weldable, however when subsequently welding tubes produced according to this document account should be taken of the fact that the behaviour of the steel during and after welding is dependent not only on the steel but also on the conditions of preparing for and carrying out the welding. 8.2.2 Tubes shall be suitable for cold bending and threading. NOTE When bending tubes produced in accordance with this document, appropriate tooling should be correctly used. 8.3 Appearance 8.3.1 The tubes shall be free from such external and internal surface defects that can be detected by visual examination. 8.3.2 The internal and external surface finish of the tubes shall be typical of the manufacturing process and, where applicable, the heat treatment employed.
The finish and surface condition shall be such that any surface imperfections or marks requiring dressing can be identified. 8.3.3 It shall be permissible to dress, only by grinding or machining, surface imperfections provided that, after doing so, the tube 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. 8.3.4 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 Dimensions, masses and tolerances 8.4.1 Specified outside diameters (D), wall thicknesses (T) and masses per unit length Medium and Heavy series tubes are listed in Table 2.

Table 2 — Dimensions, diameter tolerance and mass per unit length Specified outside diametera Thread Sizea Outside diameter H M Heavy series Medium series Wall thickness Mass per unit length of bare tube W
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