General Information

Abstract

This European Standard complements EN 1708-1 with regard to applications in industrial, chemical and pharmaceutical sectors. It specifies established examples on how to construct claddings, linings and dissimilar joints and complex connections relevant to the welding technology and with regard to pressurized components (e.g. vessels, boilers and piping). In the following text therefore the term pressurized components will be used.
These examples can also be used for other applications provided the relevant requirements are taken into account. For exceptional cases such as specific problems concerning corrosion or materials in need of special processes, other solutions can be necessary which are to be agreed upon between purchaser and manufacturer.
Appropriate national regulations and corresponding design specifications are to be followed when selecting design examples as well as, if applicable, different or further requirements.
This European Standard does not override conditions on dimensioning of welded joints regarding strength (e.g.   according to EN 12952, EN 12953, EN 13445 and EN 13480). It is to be applied in accordance with the specified application limits for pressurized components subject to compression stress with bearing wall thicknesses  30 mm. This limit is chosen for structural reasons and not for the heat treatment that may be required. The wall thickness limit applies to butt welds in the bearing vessel wall only and does not apply to flanges, torispherical heads, flat ends or other similar parts.
This European Standard applies to the following types of steel:
- non alloyed steels with a minimum tensile strength of Rm  450 MPa;
- P295GH and 16Mo3 according to EN 10028-2;
- fine-grain steels according to EN 10028-3 with a minimum yield point ReL  355 MPa;
- austenitic steels according to EN 10028-7.
This European Standard can also be applied to other steels and/or larger wall thicknesses, provided that an agreement has been made between the manufacturer and the purchaser/operating authority.

Status
Published
Publication Date
06-Mar-2012
Withdrawal Date
29-Sep-2012
Technical Committee
CEN/TC 121 - Welding
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
13-Oct-2025
Completion Date
23-Sep-2026

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Overview

EN 1708-3:2012 (CEN) - "Welding - Basic weld joint details in steel - Part 3: Clad, buttered and lined pressurized components" provides established design examples and welding guidance for claddings, buttering and linings used on pressurized components (vessels, boilers, piping). It complements EN 1708‑1 by focusing on industrial, chemical and pharmaceutical applications and gives practical weld joint details, limitations and selection guidance without replacing strength- or dimensioning standards.

Key topics and technical requirements

  • Scope and materials: Applies to ferritic and austenitic steels commonly used for pressure equipment, including non‑alloy steels (Rm ≤ 450 MPa), P295GH and 16Mo3 (EN 10028‑2), fine‑grain steels (EN 10028‑3, ReL ≤ 355 MPa) and austenitic steels (EN 10028‑7). Application to other steels/wall thicknesses is possible by agreement.
  • Application limits: Intended for pressurized components subject to compression stress with bearing butt‑weld wall thicknesses ≤ 30 mm (structural limit only; excludes some heads/flanges).
  • Cladding and lining design: Typical austenitic cladding thickness tp is 2–4 mm; minimum lining thickness tl is 2 mm. Tables in the standard give examples (clad, lined, tailored blanks, plug welds) and minimum dimensions for common detail types.
  • Dissimilar metal joints: Guidance on filler metal selection:
    • If no post‑weld heat treatment (PWHT) and operating temperature ≤ 300 °C → austenitic filler metals (suitability tested).
    • If PWHT and/or operating temperature > 300 °C → nickel‑based alloys or other tested fillers; strength differences must be considered in design.
    • Local melt‑throughs are not permissible for ferritic–austenitic joints; minimum austenitic wall thicknesses (e.g. t1 ≥ 4.0 mm) are specified for many cases.
  • Welding practice & testing: EN 1011‑5 applies to welding of clad steel. Cladding adhesion should be checked (e.g. UT) prior to subsequent welding. Avoid cavities between ferritic base metal and austenitic liner for elevated temperature service.

Practical applications and users

  • Target users: welding engineers, fabricators, pressure‑vessel and piping manufacturers, QA/QC inspectors, design engineers and procurement in chemical, pharmaceutical, power and general process industries.
  • Typical uses: designing and detailing welded connections for clad vessels, buttered transitions, lined nozzles, flanges and complex connections where corrosion resistance or dissimilar materials are required.
  • Practical value: provides ready design examples, minimum dimensions and welding constraints to inform WPS development, inspection planning and purchaser‑manufacturer agreements.

Related standards

  • EN 1708‑1 (pressurized components), EN 1011‑5 (welding of clad steel)
  • EN 10028‑2/3/7 (material specifications)
  • EN 12952 / EN 12953 / EN 13445 / EN 13480 (dimensioning/strength requirements)
  • ISO/TR 25901, CEN ISO/TR 15608, CEN ISO/TR 20172

Keywords: EN 1708-3:2012, welding, clad steel, buttering, lining, pressurized components, dissimilar metal joints, pressure vessel welding, EN 1011-5.

Relations

Effective Date
09-Feb-2026
Effective Date
28-Jan-2026
Effective Date
28-Jan-2026
Effective Date
28-Jan-2026
Effective Date
28-Jan-2026
Effective Date
28-Jan-2026

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Frequently Asked Questions

EN 1708-3:2012 is a standard published by the European Committee for Standardization (CEN). Its full title is "Welding - Basic weld joint details in steel - Part 3: Clad, buttered and lined pressurized components". This standard covers: This European Standard complements EN 1708-1 with regard to applications in industrial, chemical and pharmaceutical sectors. It specifies established examples on how to construct claddings, linings and dissimilar joints and complex connections relevant to the welding technology and with regard to pressurized components (e.g. vessels, boilers and piping). In the following text therefore the term pressurized components will be used. These examples can also be used for other applications provided the relevant requirements are taken into account. For exceptional cases such as specific problems concerning corrosion or materials in need of special processes, other solutions can be necessary which are to be agreed upon between purchaser and manufacturer. Appropriate national regulations and corresponding design specifications are to be followed when selecting design examples as well as, if applicable, different or further requirements. This European Standard does not override conditions on dimensioning of welded joints regarding strength (e.g. according to EN 12952, EN 12953, EN 13445 and EN 13480). It is to be applied in accordance with the specified application limits for pressurized components subject to compression stress with bearing wall thicknesses  30 mm. This limit is chosen for structural reasons and not for the heat treatment that may be required. The wall thickness limit applies to butt welds in the bearing vessel wall only and does not apply to flanges, torispherical heads, flat ends or other similar parts. This European Standard applies to the following types of steel: - non alloyed steels with a minimum tensile strength of Rm  450 MPa; - P295GH and 16Mo3 according to EN 10028-2; - fine-grain steels according to EN 10028-3 with a minimum yield point ReL  355 MPa; - austenitic steels according to EN 10028-7. This European Standard can also be applied to other steels and/or larger wall thicknesses, provided that an agreement has been made between the manufacturer and the purchaser/operating authority.

This European Standard complements EN 1708-1 with regard to applications in industrial, chemical and pharmaceutical sectors. It specifies established examples on how to construct claddings, linings and dissimilar joints and complex connections relevant to the welding technology and with regard to pressurized components (e.g. vessels, boilers and piping). In the following text therefore the term pressurized components will be used. These examples can also be used for other applications provided the relevant requirements are taken into account. For exceptional cases such as specific problems concerning corrosion or materials in need of special processes, other solutions can be necessary which are to be agreed upon between purchaser and manufacturer. Appropriate national regulations and corresponding design specifications are to be followed when selecting design examples as well as, if applicable, different or further requirements. This European Standard does not override conditions on dimensioning of welded joints regarding strength (e.g. according to EN 12952, EN 12953, EN 13445 and EN 13480). It is to be applied in accordance with the specified application limits for pressurized components subject to compression stress with bearing wall thicknesses  30 mm. This limit is chosen for structural reasons and not for the heat treatment that may be required. The wall thickness limit applies to butt welds in the bearing vessel wall only and does not apply to flanges, torispherical heads, flat ends or other similar parts. This European Standard applies to the following types of steel: - non alloyed steels with a minimum tensile strength of Rm  450 MPa; - P295GH and 16Mo3 according to EN 10028-2; - fine-grain steels according to EN 10028-3 with a minimum yield point ReL  355 MPa; - austenitic steels according to EN 10028-7. This European Standard can also be applied to other steels and/or larger wall thicknesses, provided that an agreement has been made between the manufacturer and the purchaser/operating authority.

EN 1708-3:2012 is classified under the following ICS (International Classification for Standards) categories: 25.160.40 - Welded joints and welds. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 1708-3:2012 has the following relationships with other standards: It is inter standard links to ISO/TR 25901:2007, EN 1011-5:2003, EN 10028-3:2017, EN 1708-1:2010, EN 10028-7:2016, EN 10028-2:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 1708-3:2012 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Schweißen - Verbindungselemente beim Schweißen von Stahl - Teil 3: Plattierungen, Pufferungen, Auskleidungen druckbeanspruchter BauteileSoudage - Descriptif de base des assemblages soudés en acier - Partie 3: Composants plaqués, beurrés et doublés soumis à la pressionWelding - Basic weld joint details in steel - Part 3: Clad, buttered and lined pressurized components25.160.40Varjeni spoji in variWelded jointsICS:Ta slovenski standard je istoveten z:EN 1708-3:2012SIST EN 1708-3:2012en,fr,de01-maj-2012SIST EN 1708-3:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1708-3
March 2012 ICS 25.160.40 English Version
Welding - Basic weld joint details in steel - Part 3: Clad, buttered and lined pressurized components
Soudage - Descriptif de base des assemblages soudés en acier - Partie 3: Composants plaqués, beurrés et doublés soumis à la pression
Schweißen - Verbindungselemente beim Schweißen von Stahl - Teil 3: Plattierungen, Pufferungen, Auskleidungen druckbeanspruchter Bauteile This European Standard was approved by CEN on 28 January 2012.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1708-3:2012: ESIST EN 1708-3:2012

Part 1: Pressurized components Part 2: Non internal pressurized components Part 3: Clad, buttered and lined pressurized components According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 1708-3:2012

according to EN 12952, EN 12953, EN 13445 and EN 13480). It is to be applied in accordance with the specified application limits for pressurized components subject to compression stress with bearing wall thicknesses ≤ 30 mm. This limit is chosen for structural reasons and not for the heat treatment that may be required. The wall thickness limit applies to butt welds in the bearing vessel wall only and does not apply to flanges, torispherical heads, flat ends or other similar parts. This European Standard applies to the following types of steel:  non alloyed steels with a minimum tensile strength of Rm ≤ 450 MPa;  P295GH and 16Mo3 according to EN 10028-2;  fine-grain steels according to EN 10028-3 with a minimum yield point ReL ≤ 355 MPa;  austenitic steels according to EN 10028-7. This European Standard can also be applied to other steels and/or larger wall thicknesses, provided that an agreement has been made between the manufacturer and the purchaser/operating authority. 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 1011-5, Welding — Recommendations for welding of metallic materials — Part 5: Welding of clad steel EN 1708-1:2010, Welding — Basic welded joint details in steel — Part 1: Pressurized components EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties EN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10028-7, Flat products made of steels for pressure purposes — Part 7: Stainless steels ISO/TR 25901:2007, Welding and related processes — Vocabulary SIST EN 1708-3:2012
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