SIST EN 12952-2:2022

Water-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of boilers and accessories

This European Standard specifies the requirements for the product forms for use in pressure parts of water-tube boilers and for parts welded on to pressure parts:
   plates;
   wrought seamless tubes;
   electrically welded tubes;
   submerged, plasma and TIG arc-welded tubes;
   forgings;
   castings;
   rolled bars;
   welding consumables;
   fasteners;
   seamless composite tubes.

Wasserrohrkessel und Anlagenkomponenten - Teil 2: Werkstoffe für drucktragende Kesselteile und Zubehör

Chaudières à tubes d'eau et installations auxiliaires - Partie 2: Matériaux des parties sous pression des chaudières et accessoires

Vodocevni kotli in pomožne napeljave - 2. del: Materiali za tlačno obremenjene dele in opremo kotla

Ta evropski standard določa zahteve za oblike izdelkov, ki se uporabljajo v tlačno obremenjenih delih vodocevnih kotlov, in za dele, privarjene na tlačno obremenjene dele:
–   plošče;
–   gnetene nevarjene cevi;
–   električno varjene cevi;
–   obločno pod praškom varjene cevi, plazemsko obločno varjene cevi in cevi, varjene v inertnem plinu z volframovo elektrodo (TIG);
–   izkovke;
–   ulitke;
–   valjane palice;
–   potrošni material za varjenje;
–   vezne elemente;
–   nevarjene kompozitne cevi.

General Information

• Status: Published
• Public Enquiry End Date: 02-Apr-2020
• Publication Date: 17-Jan-2022
• ICS: 27.060.30 - Boilers and heat exchangers
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Jan-2022
• Due Date: 24-Mar-2022
• Completion Date: 18-Jan-2022
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: EN 12952-2:2021 - Water-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of boilers and accessories

Relations

• Replaces: SIST EN 12952-2:2011 - Water-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of boilers and accessories
• Effective Date: 01-Feb-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 12952-2:2022
01-februar-2022
Nadomešča:
SIST EN 12952-2:2011
Vodocevni kotli in pomožne napeljave - 2. del: Materiali za tlačno obremenjene
dele in opremo kotla
Water-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of
boilers and accessories
Wasserrohrkessel und Anlagenkomponenten - Teil 2: Werkstoffe für drucktragende
Kesselteile und Zubehör
Chaudières à tubes d'eau et installations auxiliaires - Partie 2: Matériaux des parties
sous pression des chaudières et accessoires
Ta slovenski standard je istoveten z: EN 12952-2:2021
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
SIST EN 12952-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 12952-2:2022

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SIST EN 12952-2:2022


EN 12952-2
EUROPEAN STANDARD

NORME EUROPÉENNE

December 2021
EUROPÄISCHE NORM
ICS 27.040 Supersedes EN 12952-2:2011
English Version

Water-tube boilers and auxiliary installations - Part 2:
Materials for pressure parts of boilers and accessories
Chaudières à tubes d'eau et installations auxiliaires - Wasserrohrkessel und Anlagenkomponenten - Teil 2:
Partie 2: Matériaux des parties sous pression des Werkstoffe für drucktragende Kesselteile und Zubehör
chaudières et accessoires
This European Standard was approved by CEN on 1 November 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12952-2:2021 E
worldwide for CEN national Members.

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
Contents Page

European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 10
4 General requirements . 10
4.1 Selection of materials with regard to service conditions . 10
4.2 Selection of materials with regard to fabrication . 10
4.3 Material specification . 11
4.3.1 General. 11
4.3.2 European Standards . 11
4.3.3 European approvals for materials . 11
4.3.4 Particular material appraisals . 11
4.4 Consideration of special materials properties . 11
4.5 Contents of material specification . 11
4.6 Compliance and inspection documentation of materials . 12
5 Material for pressure parts . 12
5.1 Materials covered by harmonized European product Standards for pressure purposes
. 12
5.1.1 Flat products, forgings, castings, tubes, fittings, flanges and valve bodies . 12
5.1.2 Cast iron . 12
5.1.3 Studs, bolts and nuts . 12
5.1.4 Welding consumables . 13
5.1.5 Requirements for plates used for heads . 13
5.1.6 Requirements for non-destructive examination . 13
5.1.7 Marking . 15
5.2 Material covered by European approvals of materials for pressure equipment —
technical requirements . 15
5.2.1 General. 15
5.2.2 Manufacture . 15
5.2.3 Heat treatment condition. 15
5.2.4 Chemical composition . 15
5.2.5 Mechanical and technological properties . 16
5.3 Materials with particular material appraisals . 19
6 Materials for non-pressure parts . 19
Annex A (normative) Materials covered by European material Standards . 20
A.1 Pressure parts . 20
A.2 Fittings . 20
A.3 Flanges . 20
A.4 Valves . 20
Annex B (normative) Establishment of creep rupture strength values for new materials . 33
Annex C (normative) Special requirements for composite tubes . 34
2

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
C.1 General . 34
C.2 Special requirements for composite tubing. 34
C.2.1 Composite tubing . 34
C.2.2 General . 34
C.2.3 Chemical composition . 34
C.2.4 Mechanical and technological properties . 34
C.2.4.1 Tensile test of ferritic pressure retaining inner core . 34
C.2.4.2 Ring expanding test (composite tube) . 34
C.2.5 Tolerances . 35
C.2.5.1 Permissible variations in Outside diameter and wall thickness . 35
C.2.5.2 Permissible variations in straightness . 35
C.2.6 Surface finish . 35
C.2.7 Ultrasonic testing . 35
C.2.7.1 Ultrasonic testing of the metallurgical bond in composite tubes . 35
C.2.7.1.1 Extent of testing . 35
C.2.7.1.2 Reference standard . 35
C.2.7.1.3 Acceptance criteria . 35
C.2.7.2 Ultrasonic testing of composite tubes concerning longitudinal and transverse
imperfections . 36
C.2.7.2.1 Method of testing . 36
C.2.7.2.2 Reference standard . 36
C.2.7.2.3 Calibration . 36
C.2.8 Thickness check of stainless steel component . 36
C.2.8.1 General . 36
C.2.8.2 Calibration. 36
C.2.8.3 Acceptance criteria . 36
C.2.9 Summary of tests and examinations . 37
C.3 Marking . 37
C.3.1 General . 37
C.3.2 Additional marking requirements . 37
Annex D (informative) Significant technical changes between this document and the
previous edition . 38
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU aimed to be covered . 39
Bibliography . 40


3

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
European foreword
This document (EN 12952-2:2021) has been prepared by Technical Committee CEN/TC 269 “Shell and
water-tube boilers”, the secretariat of which is held by DIN.
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 2022, and conflicting national standards shall be
withdrawn at the latest by June 2022.
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 12952-2:2011.
Annex D provides details of significant technical changes between this document and the previous
edition.
EN 12952 series concerning water-tube boilers and auxiliary installations consists of the following parts:
• Part 1: General;
• Part 2: Materials for pressure parts of boilers and accessories;
• Part 3: Design and calculation for pressure parts;
• Part 4: In service boiler life expectancy calculations;
• Part 5: Workmanship and construction of pressure parts of the boiler;
• Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler;
• Part 7: Requirements for equipment for the boiler;
• Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler;
• Part 9: Requirements for firing systems for pulverized solid fuels for the boiler;
• Part 10: Requirements for safeguards against excessive pressure;
• Part 11: Requirements for limiting devices of the boiler and accessories;
• Part 12: Requirements for boiler feedwater and boiler water quality;
• Part 13: Requirements for flue gas cleaning systems;
• Part 14: Requirements for flue gas DENOX systems using liquefied pressurized ammonia and ammonia
water solution;
• Part 15: Acceptance tests;
• Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler;
• CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the
manufacturer.
4

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
• Part 18: Operating Instructions
Although these parts can be obtained separately, it should be recognized that the parts are inter-
dependent. As such, the design and manufacture of water-tube boilers requires the application of more
than one part in order for the requirements of the document to be satisfactorily fulfilled.
NOTE A “Boiler Helpdesk” has been established in CEN/TC 269 which can be contacted for any questions
regarding the application of EN 12952 series and EN 12953 series, see the following website: http://www.boiler-
helpdesk.din.de
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
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, Turkey and the United
Kingdom.
5

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
1 Scope
This document specifies the requirements for the product forms for use in pressure parts of water-tube
boilers and for parts welded on to pressure parts:
• plates;
• wrought seamless tubes;
• electrically welded tubes;
• submerged, plasma and TIG arc-welded tubes;
• forgings;
• castings;
• rolled bars;
• welding consumables;
• fasteners;
• seamless composite tubes.
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 764-4:2014, Pressure equipment - Part 4: Establishment of technical delivery conditions for metallic
materials
EN 764-5:2014, Pressure equipment - Part 5: Inspection documentation of metallic materials and
compliance with the material specification
EN 1092-1:2018, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 1: Steel flanges
EN 1759-1:2004, Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class
designated - Part 1: Steel flanges, NPS 1/2 to 24
EN 10021:2006, General technical delivery conditions for steel products
EN 10028-2:2017, Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels
with specified elevated temperature properties
EN 10028-3:2017, Flat products made of steels for pressure purposes - Part 3: Weldable fine grain steels,
normalized
EN 10028-7:2016, Flat products made of steels for pressure purposes - Part 7: Stainless steels
EN 10160:1999, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
6

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
EN 10164:2018, Steel products with improved deformation properties perpendicular to the surface of the
product - Technical delivery conditions
EN 10213:2007+A1:2016, Steel castings for pressure purposes
EN 10216-2:2013+A1:2019, Seamless steel tubes for pressure purposes - Technical delivery conditions -
Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-3:2013, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy
fine grain steel tubes
EN 10216-5:2021, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5:
Stainless steel tubes
EN 10217-2:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2: Electric
welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-3:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 3: Electric
welded and submerged arc welded alloy fine grain steel tubes with specified room, elevated and low
temperature properties
EN 10217-5:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5:
Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10222-2:2017+A1:2021, Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels
with specified elevated temperatures properties
EN 10222-3:2017, Steel forgings for pressure purposes - Part 3: Nickel steels with specified low temperature
properties
EN 10222-4:2017+A1:2021, Steel forgings for pressure purposes - Part 4: Weldable fine grain steels with
high proof strength
EN 10222-5:2017, Steel forgings for pressure purposes - Part 5: Martensitic, austenitic and austenitic-
ferritic stainless steels
EN 10228-1:2016, Non-destructive testing of steel forgings - Part 1: Magnetic particle inspection
EN 10228-3:2016, Non-destructive testing of steel forgings - Part 3: Ultrasonic testing of ferritic or
martensitic steel forgings
EN 10253-2:2021, Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific
inspection requirements
EN 10253-4:2008/AC:2009, Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic
(duplex) stainless steels with specific inspection requirements
EN 10254:1999, Steel closed die forgings - General technical delivery conditions
EN 10269:2013, Steels and nickel alloys for fasteners with specified elevated and/or low temperature
properties
EN 10273:2016, Hot rolled weldable steel bars for pressure purposes with specified elevated temperature
properties
7

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
EN 10308:2001, Non destructive testing - Ultrasonic testing of steel bars
EN 10314:2016, Method for the derivation of minimum values of proof strength of steel at elevated
temperatures
EN 12074:2000, Welding consumables - Quality requirements for manufacture, supply and distribution of
consumables for welding and allied processes
EN 12952-3:2011, Water-tube boilers and auxiliary installations - Part 3: Design and calculation for
pressure parts of the boiler
EN 12952-5:2021, Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction
of pressure parts of the boiler
EN 12952-6:2021, Water-tube boilers and auxiliary installations — Part 6: Inspection during construction,
documentation and marking of pressure parts of the boiler
EN 12952-7:2012, Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for
the boiler
EN 12952-12:2003, Water-tube boilers and auxiliary installations - Part 12: Requirements for boiler
feedwater and boiler water quality
EN 13479:2017, Welding consumables - General product standard for filler metals and fluxes for fusion
welding of metallic materials
EN 16668:2016+A1:2018, Industrial valves - Requirements and testing for metallic valves as pressure
accessories
EN ISO 148-1:2016, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-
1:2016)
EN ISO 544:2017, Welding consumables - Technical delivery conditions for filler materials and fluxes - Type
of product, dimensions, tolerances and markings (ISO 544:2017)
EN ISO 636:2017, Welding consumables - Rods, wires and deposits for tungsten inert gas welding of non-
alloy and fine-grain steels - Classification (ISO 636:2017)
EN ISO 2560:2020, Welding consumables - Covered electrodes for manual metal arc welding of non-alloy
and fine grain steels - Classification (ISO 2560:2020)
EN ISO 2566-1:1999, Steel - Conversion of elongation values - Part 1: Carbon and low alloy steels (ISO 2566-
1:1984)
EN ISO 2566-2:1999, Steel - Conversion of elongation values - Part 2: Austenitic steels (ISO 2566-2:1984)
EN ISO 3580:2017, Welding consumables - Covered electrodes for manual metal arc welding of creep-
resisting steels - Classification (ISO 3580:2017)
EN ISO 3581:2016, Welding consumables - Covered electrodes for manual metal arc welding of stainless
and heat-resisting steels - Classification (ISO 3581:2016, Corrected version 2017-11-01)
EN ISO 6892-1:2019, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2019)
8

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
EN ISO 6892-2:2018, Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 8495:2013, Metallic materials - Tube - Ring-expanding test (ISO 8495:2013)
EN ISO 10893-10:2011, 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 10893-10:2011)
EN ISO 14171:2016, Welding consumables - Solid wire electrodes, tubular cored electrodes and
electrode/flux combinations for submerged arc welding of non alloy and fine grain steels - Classification
(ISO 14171:2016)
EN ISO 14174:2019, Welding consumables - Fluxes for submerged arc welding and electroslag welding -
Classification (ISO 14174:2019)
EN ISO 14341:2020, Welding consumables - Wire electrodes and weld deposits for gas shielded metal arc
welding of non alloy and fine grain steels - Classification (ISO 14341:2020)
EN ISO 14343:2017, Welding consumables - Wire electrodes, strip electrodes, wires and rods for arc welding
of stainless and heat resisting steels - Classification (ISO 14343:2017)
EN ISO 14344:2010, Welding consumables - Procurement of filler materials and fluxes (ISO 14344:2010)
EN ISO 16834:2012, Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of high strength steels - Classification (ISO 16834:2012)
EN ISO 17632:2015, Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded
metal arc welding of non-alloy and fine grain steels - Classification (ISO 17632:2015)
EN ISO 17633:2018, Welding consumables - Tubular cored electrodes and rods for gas shielded and non-
gas shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO 17633:2017)
EN ISO 17634:2015, Welding consumables - Tubular cored electrodes for gas shielded metal arc welding of
creep-resisting steels - Classification (ISO 17634:2015)
EN ISO 18276:2017, Welding consumables - Tubular cored electrodes for gas-shielded and non-gas-
shielded metal arc welding of high strength steels - Classification (ISO 18276:2017)
EN ISO 20378:2018, Welding consumables - Rods for gas welding of non-alloy and creep-resisting steels -
Classification (ISO 20378:2017)
EN ISO 21952:2012, Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of creep-resisting steels - Classification (ISO 21952:2012)
EN ISO 24598:2019, Welding consumables - Solid wire electrodes, tubular cored electrodes and electrode-
flux combinations for submerged arc welding of creep-resisting steels - Classification (ISO 24598:2019)
EN ISO 26304:2018, Welding consumables - Solid wire electrodes, tubular cored electrodes and electrode-
flux combinations for submerged arc welding of high strength steels - Classification (ISO 26304:2017)
ISO 6303:1981, Pressure vessel steels not included in ISO 2604, Parts 1 to 6 — Derivation of long-time stress
rupture properties
9

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SIST EN 12952-2:2022
EN 12952-2:2021 (E)
ISO 18275:2018, Welding consumables — Covered electrodes for manual metal arc welding of high-
strength steels — Classification
CEN ISO/TR 15608:2017, Welding - Guidelines for a metallic materials grouping system
(ISO/TR 15608:2017)
CEN ISO/TR 20172:2009, Welding - Grouping systems for materials - European materials
(ISO/TR 20172:2009)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
4 General requirements
4.1 Selection of materials with regard to service conditions
The manufacturer of the water-tube boilers shall select the material (including welding consumables) for
the manufacture of the boilers so that, when the delivered material (including welding consumables)
complies with the requirements specified in the material order and when the design rules in
EN 12952-3:2011 and the rules for the fabrication, inspection and testing of the boilers in
EN 12952-5:2021 and EN 12952-6:2021 are observed, the boilers can be operated without hazard under
the service conditions (pressures, temperatures, environments, etc.) for the life time provided in the
order for the boiler.
The materials specified in Clause 5 which satisfy the elongation and impact energy requirements of
5.
...

SLOVENSKI STANDARD
oSIST prEN 12952-2:2020
01-marec-2020
Vodocevni kotli in pomožne napeljave - 2. del: Materiali za tlačno obremenjene
dele in opremo kotla
Water-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of
boilers and accessories
Wasserrohrkessel und Anlagenkomponenten - Teil 2: Werkstoffe für drucktragende
Kesselteile und Zubehör
Chaudières à tubes d'eau et installations auxiliaires - Partie 2: Matériaux des parties
sous pression des chaudières et accessoires
Ta slovenski standard je istoveten z: prEN 12952-2
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
oSIST prEN 12952-2:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12952-2:2020

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oSIST prEN 12952-2:2020


DRAFT
EUROPEAN STANDARD
prEN 12952-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

February 2020
ICS 27.040 Will supersede EN 12952-2:2011
English Version

Water-tube boilers and auxiliary installations - Part 2:
Materials for pressure parts of boilers and accessories
Chaudières à tubes d'eau et installations auxiliaires - Wasserrohrkessel und Anlagenkomponenten - Teil 2:
Partie 2: Matériaux des parties sous pression des Werkstoffe für drucktragende Kesselteile und Zubehör
chaudières et accessoires
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 269.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12952-2:2020 E
worldwide for CEN national Members.

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oSIST prEN 12952-2:2020
prEN 12952-2:2020 (E)
Contents Page

European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 10
4 General requirements . 10
4.1 Selection of materials with regard to service conditions . 10
4.2 Selection of materials with regard to fabrication . 10
4.3 Material specification . 10
4.3.1 General. 10
4.3.2 European Standards . 11
4.3.3 European approvals for materials . 11
4.3.4 Particular material appraisals . 11
4.4 Consideration of special materials properties . 11
4.5 Contents of material specification . 11
4.6 Compliance and inspection documentation of materials . 12
5 Material for pressure parts . 12
5.1 Materials covered by harmonized European product Standards for pressure
purposes . 12
5.1.1 Flat products, forgings, castings, tubes, fittings, flanges and valve bodies . 12
5.1.2 Cast iron . 12
5.1.3 Studs, bolts and nuts . 12
5.1.4 Welding consumables . 13
5.1.5 Requirements for plates used for heads . 13
5.1.6 Requirements for non-destructive examination . 13
5.1.7 Inspection documents . 15
5.1.8 Marking . 15
5.2 Material covered by European approvals of materials for pressure equipment —
technical requirements . 15
5.2.1 General. 15
5.2.2 Manufacture . 15
5.2.3 Heat treatment condition. 15
5.2.4 Chemical composition . 16
5.2.5 Mechanical and technological properties . 16
5.3 Materials with particular material appraisals . 19
6 Materials for non-pressure parts . 19
7 Inspection documentation. 20
Annex A (normative) Materials covered by European material Standards . 21
A.1 Pressure parts . 21
A.2 Fittings . 21
A.3 Flanges . 21
A.4 Valves . 21
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Annex B (normative) Establishment of creep rupture strength values for new materials . 30
Annex C (normative) Special requirements for composite tubes . 31
C.1 General . 31
C.2 Special requirements for composite tubing. 31
C.2.1 Composite tubing . 31
C.2.2 General . 31
C.2.3 Chemical composition . 31
C.2.4 Mechanical and technological properties . 31
C.2.4.1 Tensile test of ferritic pressure retaining inner core . 31
C.2.4.2 Ring expanding test (composite tube) . 31
C.2.5 Tolerances . 32
C.2.5.1 Permissible variations in OD and wall thickness . 32
C.2.5.2 Permissible variations in straightness . 32
C.2.6 Surface finish . 32
C.2.7 Ultrasonic testing . 32
C.2.7.1 Ultrasonic testing of the metallurgical bond in composite tubes . 32
C.2.7.1.1 Extent of testing . 32
C.2.7.1.2 Reference standard . 32
C.2.7.1.3 Acceptance criteria . 32
C.2.7.2 Ultrasonic testing of composite tubes concerning longitudinal and transverse
imperfections . 33
C.2.7.2.1 Method of testing . 33
C.2.7.2.2 Reference standard . 33
C.2.7.2.3 Calibration . 33
C.2.8 Thickness check of stainless steel component . 33
C.2.8.1 General . 33
C.2.8.2 Calibration. 33
C.2.8.3 Acceptance criteria . 33
C.2.9 Summary of tests and examinations . 34
C.3 Marking . 34
C.3.1 General . 34
C.3.2 Additional marking requirements . 34
Annex D (informative) Significant technical changes between this document and the
previous edition . 35
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU aimed to be covered . 36
Bibliography . 37

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oSIST prEN 12952-2:2020
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European foreword
This document (prEN 12952-2:2020) has been prepared by Technical Committee CEN/TC 269 “Shell
and water-tube boilers”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12952-2:2011.
Annex D provides details of significant technical changes between this document and the previous
edition.
EN 12952 series concerning water-tube boilers and auxiliary installations consists of the following
parts:
• Part 1: General;
• Part 2: Materials for pressure parts of boilers and accessories;
• Part 3: Design and calculation for pressure parts;
• Part 4: In service boiler life expectancy calculations;
• Part 5: Workmanship and construction of pressure parts of the boiler;
• Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler;
• Part 7: Requirements for equipment for the boiler;
• Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler;
• Part 9: Requirements for firing systems for pulverized solid fuels for the boiler;
• Part 10: Requirements for safeguards against excessive pressure;
• Part 11: Requirements for limiting devices of the boiler and accessories;
• Part 12: Requirements for boiler feedwater and boiler water quality;
• Part 13: Requirements for flue gas cleaning systems;
• Part 14: Requirements for flue gas DENOX systems using liquefied pressurized ammonia and ammonia
water solution;
• Part 15: Acceptance tests;
• Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler;
• CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the
manufacturer.
NOTE 1 A Part 18 on operating instructions is currently in preparation.
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Although these parts may be obtained separately, it should be recognized that the parts are inter-
dependent. As such, the design and manufacture of water-tube boilers requires the application of more
than one part in order for the requirements of the document to be satisfactorily fulfilled.
NOTE 2 Part 4 and Part 15 are not applicable during the design, construction and installation stages.
NOTE 3 A “Boiler Helpdesk” has been established in CEN/TC 269 which may be contacted for any questions
regarding the application of EN 12952 series and EN 12953 series, see the following website: http://www.boiler-
helpdesk.din.de
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive 2014/68/EU, see informative Annex ZA, which is an integral part of
this document.
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oSIST prEN 12952-2:2020
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1 Scope
This document specifies the requirements for the product forms for use in pressure parts of water-tube
boilers and for parts welded on to pressure parts:
• plates;
• wrought seamless tubes;
• electrically welded tubes;
• submerged, plasma and TIG arc-welded tubes;
• forgings;
• castings;
• rolled bars;
• welding consumables;
• fasteners;
• seamless composite tubes.
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.
CEN ISO/TR 20172:2009, Welding — Grouping systems for materials — European materials
(ISO/TR 20172:2009)
EN 764-4:2014, Pressure equipment - Part 4: Establishment of technical delivery conditions for metallic
materials
EN 764-5:2014, Pressure equipment - Part 5: Inspection documentation of metallic materials and
compliance with the material specification
EN 1092-1:2018, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 1: Steel flanges
EN 1759-1:2004, Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class
designated - Part 1: Steel flanges, NPS 1/2 to 24
EN 10021:2006, General technical delivery conditions for steel products
EN 10028-2:2017, Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels
with specified elevated temperature properties
EN 10028-3:2017, Flat products made of steels for pressure purposes - Part 3: Weldable fine grain steels,
normalized
EN 10028-7:2016, Flat products made of steels for pressure purposes - Part 7: Stainless steels
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EN 10160:1999, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10164:2018, Steel products with improved deformation properties perpendicular to the surface of the
product - Technical delivery conditions
EN 10204:2004, Metallic products - Types of inspection documents
EN 10213:2007+A1:2016, Steel castings for pressure purposes
EN 10216-2:2013+A1:2019, Seamless steel tubes for pressure purposes — Technical delivery
conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-3:2013, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy
fine grain steel tubes
EN 10216-5:2013, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5:
Stainless steel tubes
EN 10217-2:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2:
Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-3:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 3:
Electric welded and submerged arc welded alloy fine grain steel tubes with specified room, elevated and
low temperature properties
EN 10217-5:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5:
Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10222-2:2017, Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels with
specified elevated temperatures properties
EN 10222-3:2017, Steel forgings for pressure purposes - Part 3: Nickel steels with specified low
temperature properties
EN 10222-4:2017, Steel forgings for pressure purposes - Part 4: Weldable fine grain steels with high proof
strength
EN 10222-5:2017, Steel forgings for pressure purposes - Part 5: Martensitic, austenitic and austenitic-
ferritic stainless steels
EN 10228-1:2016, Non-destructive testing of steel forgings - Part 1: Magnetic particle inspection
EN 10228-3:2016, Non-destructive testing of steel forgings - Part 3: Ultrasonic testing of ferritic or
martensitic steel forgings
EN 10253-2:2007, Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific
inspection requirements
1
prEN 10253-4:2017, Butt-welding pipe fittings — Part 4: Wrought austenitic and austenitic-ferritic
(duplex) stainless steels with specific inspection requirements

1
Under preparation
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EN 10254:1999, Steel closed die forgings - General technical delivery conditions
EN 10269:2013, Steels and nickel alloys for fasteners with specified elevated and/or low temperature
properties
EN 10273:2016, Hot rolled weldable steel bars for pressure purposes with specified elevated temperature
properties
EN 10308:2001, Non destructive testing - Ultrasonic testing of steel bars
EN 10314:2016, Method for the derivation of minimum values of proof strength of steel at elevated
temperatures
EN 12074:2000, Welding consumables - Quality requirements for manufacture, supply and distribution of
consumables for welding and allied processes
1
prEN 12952-3:2020 , Water-tube boilers and auxiliary installations — Part 3: Design and calculation for
pressure parts of the boiler
1
prEN 12952-5:2020 , Water-tube boilers and auxiliary installations — Part 5: Workmanship and
construction of pressure parts of the boiler
1
prEN 12952-6:2020 , Water-tube boilers and auxiliary installations — Part 6: Inspection during
construction, documentation and marking of pressure parts of the boiler
EN 12952-7:2012, Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for
the boiler
EN 12952-12:2003, Water-tube boilers and auxiliary installations - Part 12: Requirements for boiler
feedwater and boiler water quality
EN 13479:2017, Welding consumables - General product standard for filler metals and fluxes for fusion
welding of metallic materials
EN 16668:2016+A1:2018, Industrial valves - Requirements and testing for metallic valves as pressure
accessories
EN ISO 148-1:2016, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-
1:2016)
EN ISO 544:2017, Welding consumables - Technical delivery conditions for filler materials and fluxes -
Type of product, dimensions, tolerances and markings (ISO 544:2017)
EN ISO 636:2017, Welding consumables - Rods, wires and deposits for tungsten inert gas welding of non-
alloy and fine-grain steels - Classification (ISO 636:2017)
EN ISO 2560:2009, Welding consumables - Covered electrodes for manual metal arc welding of non-alloy
and fine grain steels - Classification (ISO 2560:2009)
EN ISO 2566-1:1999, Steel - Conversion of elongation values - Part 1: Carbon and low alloy steels (ISO
2566-1:1984)
EN ISO 2566-2:1999, Steel - Conversion of elongation values - Part 2: Austenitic steels (ISO 2566-2:1984)
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EN ISO 3580:2017, Welding consumables - Covered electrodes for manual metal arc welding of creep-
resisting steels - Classification (ISO 3580:2017)
EN ISO 3581:2016, Welding consumables - Covered electrodes for manual metal arc welding of stainless
and heat-resisting steels - Classification (ISO 3581:2016, Corrected version 2017-11-01)
EN ISO 6892-1:2016, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2016)
EN ISO 6892-2:2018, Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 8495:2013, Metallic materials - Tube - Ring-expanding test (ISO 8495:2013)
EN ISO 10893-10:2011, 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 10893-10:2011)
EN ISO 14171:2016, Welding consumables - Solid wire electrodes, tubular cored electrodes and
electrode/flux combinations for submerged arc welding of non alloy and fine grain steels - Classification
(ISO 14171:2016)
EN ISO 14174:2019, Welding consumables - Fluxes for submerged arc welding and electroslag welding -
Classification (ISO 14174:2019)
EN ISO 14341:2011, Welding consumables - Wire electrodes and weld deposits for gas shielded metal arc
welding of non alloy and fine grain steels - Classification (ISO 14341:2010)
EN ISO 14343:2017, Welding consumables - Wire electrodes, strip electrodes, wires and rods for arc
welding of stainless and heat resisting steels - Classification (ISO 14343:2017)
EN ISO 14344:2010, Welding consumables - Procurement of filler materials and fluxes (ISO 14344:2010)
EN ISO 16834:2012, Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of high strength steels - Classification (ISO 16834:2012)
EN ISO 17632:2015, Welding consumables - Tubular cored electrodes for gas shielded and non-gas
shielded metal arc welding of non-alloy and fine grain steels - Classification (ISO 17632:2015)
EN ISO 17633:2018, Welding consumables - Tubular cored electrodes and rods for gas shielded and non-
gas shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO 17633:2017)
EN ISO 17634:2015, Welding consumables - Tubular cored electrodes for gas shielded metal arc welding
of creep-resisting steels - Classification (ISO 17634:2015)
EN ISO 18276:2017, Welding consumables - Tubular cored electrodes for gas-shielded and non-gas-
shielded metal arc welding of high strength steels - Classification (ISO 18276:2017)
EN ISO 20378:2018, Welding consumables - Rods for gas welding of non-alloy and creep-resisting steels -
Classification (ISO 20378:2017)
EN ISO 21952:2012, Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of creep-resisting steels - Classification (ISO 21952:2012)
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EN ISO 24598:2019, Welding consumables - Solid wire electrodes, tubular cored electrodes and electrode-
flux combinations for submerged arc welding of creep-resisting steels - Classification (ISO 24598:2019)
EN ISO 26304:2018, Welding consumables - Solid wire electrodes, tubular cored electrodes and electrode-
flux combinations for submerged arc welding of high strength steels - Classification (ISO 26304:2017)
ISO 6303:1981, Pressure vessel steels not included in ISO 2604, Parts 1 to 6 — Derivation of long-time
stress rupture properties
ISO 18275:2018, Welding consumables — Covered electrodes for manual metal arc welding of high-
strength steels — Classification
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 General requirements
4.1 Selection of materials with regard to service conditions
The manufacturer of the water-tube boilers shall select the material (including welding consumables)
for the manufacture of the boilers so that, when the delivered material (including welding
consumables) complies with the requirements specified in the material order and when the de
...