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

This Part 2 covers the following materials for use in cast iron pressure parts of water-tube boilers and their integral attachments covered by this European Standard and the following materials manufactured from ferritic and austenitic steels: - plates; - wrought seamless tubes; - electric resistance welded and induction welded tubes; - submerged, plasma and TIG arc-welded tubes; - forgings; - castings.

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

Diese Regelungen dieses Teiles gelten für: - Bleche; - warmgeformte nahtlose Rohre; - elektrowiderstandgeschweißte und induktiv geschweißte Rohre; - unterpulver-, plasma- und wolfram-inertgas, geschweißte Rohre; - Schmiedestücke und - Gußstücke aus ferritischen und austenitischen Stählen.

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

L'EN 12952-2 couvre les prescriptions des matériaux suivants utilisables pour les parties sous pression de chaudières à tubes d'eau et les parties soudées sur les parties sous pression :
¾ les tôles ;
¾ les tubes corroyés sans soudure ;
¾ les tubes soudés électriquement ;
¾ les tubes soudés à l'arc immergé ; sous plasma, ou par procédé TIG ;
¾ les pièces forgées ;
¾ les pièces moulées.
¾ les pièces laminées ;
¾ les produits de soudage ;
¾ les éléments de fixation ;
¾ les tubes composites sans soudure.

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

General Information

Status
Withdrawn
Publication Date
11-Dec-2001
Withdrawal Date
09-Aug-2011
Current Stage
9960 - Withdrawal effective - Withdrawal
Start Date
10-Aug-2011
Completion Date
10-Aug-2011

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserrohrkessel und Anlagenkomponenten - Teil 2: Werkstoffe für drucktragende Kesselteile und ZubehörChaudieres a tubes d'eau et installations auxiliaires - Partie 2: Matériaux des parties sous pression des chaudieres et des accessoiresWater-tube boilers and auxiliary installations - Part 2: Materials for pressure parts of boilers and accessories27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12952-2:2001SIST EN 12952-2:2002en01-november-2002SIST EN 12952-2:2002SLOVENSKI

STANDARD
SIST EN 12952-2:2002

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12952-2December 2001ICS 27.040; 77.140.01English versionWater-tube boilers and auxiliary installations - Part 2: Materialsfor pressure parts of boilers and accessoriesChaudières à tubes d'eau et installations auxiliaires - Partie2: Matériaux des parties sous pression des chaudières etaccessoiresWasserrohrkessel und Anlagenkomponenten - Teil 2:Werkstoffe für drucktragende Kesselteile und ZubehörThis European Standard was approved by CEN on 19 February 2001.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 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12952-2:2001 ESIST EN 12952-2:2002

EN 12952-2:2001 (E)ContentsPagePageForeword ...........................31Scope ..........................42Normative references ..............43General requirements ..............73.1Selection of materials with regard to service conditions ..................73.2Selection of materials with regard to fabrication ........................73.3Material specification ................73.4Consideration of special materialproperties ........................83.5Contents of material specification .......83.6Compliance and inspection documentationof materials .......................94Materials for pressure parts ..........94.1Materials covered by harmonized Europeanmaterial Standards for pressure purposes .94.2Material covered by European Approvalof material for pressure equipment –technical requirements ...............114.3Materials with particular materialappraisals ........................155Materials for non pressure parts ......156Inspection documentation ...........15AnnexesAnnex A (normative) Materials covered byEuropean material Standards ..........16A.1Pressure parts ....................16A.2Fittings

.........................16A.3Flanges .........................16A.4Valves ..........................16Annex B (normative) Establishment of creeprupture strength values for new materials .19Annex C (normative) Chemical recovery boilers 20C.1General .........................20C.2Special requirements for composite tubing 20C.3Marking .........................23Annex ZA (informative) Clauses of thisEuropean Standard addressing essentialrequirements or other provisions of thePressure Equipment Directive (PED) .....24Bibliography .........................242SIST EN 12952-2:2002

EN 12952-2:2001 (E)ForewordThis European Standard 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 has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association and supports essential requirements of the Pressure Equipment Directive (PED)1).For relationship with Pressure Equipment Directive see informative annex ZA, which is an integral Part of thisStandard.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn at the latest byJune 2002.In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement thisEuropean Standard as their National Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France,Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlandand United Kingdom.The European Standard series EN 12952 concerning water-tube boilers and auxiliary installations consists of thefollowing parts:Part 1: GeneralPart 2: Materials for pressure parts of boilers and accessoriesPart 3: Design and calculation for pressure parts Part 4: In-service boiler life expectancy calculationsPart 5: Workmanship and construction of pressure parts of the boilerPart 6: Inspection during construction, documentation and marking of pressure parts of the boilerPart 7: Requirements for equipment for the boilerPart 8: Requirements for firing systems for liquid and gaseous fuels for the boilerPart 9: Requirements for firing systems for pulverised solid fuels for the boilerPart 10:Requirements for safeguards against excessive pressurePart 11:Requirements for limiting devices and safety circuits of the boiler and accessoriesPart 12:Requirements for boiler feedwater and boiler water qualityPart 13:Requirements for flue gas cleaning systemsPart 14:Requirements for flue gas DENOX-systemsPart 15:Acceptance testsPart 16:Requirements for grate and fluidized bed firing systems for solid fuels for the boilerAlthough these Parts may be obtained separately, it should be recognized that the Parts are inter-dependent. Assuch, the design and manufacture of boilers requires the application of more than one Part in order for therequirements of the European Standard to be satisfactorily fulfilled.NOTE: Part 4 is not applicable during the design, construction and installation stages.The annexes A, B and C of this European Standard are normative, the annex ZA is informative.

1) Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment; OJEC L181.3SIST EN 12952-2:2002

EN 12952-2:2001 (E)1

ScopeThis EN 12952-2 covers the requirements for the following materials for use in pressure parts of water-tube boilersand for parts welded on 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 referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 440,

Welding consumables – Wire electrodes and deposits for gas shielded metal arc welding of non alloy andfine grain steels – Classification.EN 499,

Welding consumables – Covered electrodes for manual metal arc welding of non alloy and fine grainsteels – Classification.EN 756,

Welding consumables – Wire electrodes and wire-flux combinations for submerged arc welding of non alloyand fine grain steels – Classification.EN 758,

Welding consumables – Tubular cored electrodes for metal arc welding with and without a gas shield ofnon alloy and fine grain steels – Classification.EN 759,

Welding consumables – Technical delivery conditions for welding filler metals – Type of product,dimensions, tolerances and marking.prEN 764-4:1999,

Pressure equipment – Part 4: Establishment of technical delivery conditions for materials.prEN 764-5:1999,

Pressure equipment – Part 5: Compliance and inspection documentation of materials.prEN 1092-1:2001,

Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories, PNdesignated – Part 1: Steel flanges.EN 1503-1,

Valves – Materials for bodies, bonnets and covers – Part 1: Steels specified in European Standards.EN 1503-2 ,

Valves – Materials for bodies, bonnets and covers – Part 2: Steels other than those specified inEuropean Standards.EN 1599,

Welding consumables – Covered electrodes for manual metal arc welding of creep-resisting steels –Classification.EN 1668,

Welding consumables – Rods, wires and deposits for tungsten inert gas welding of non alloy and finegrain steels – Classification.prEN 1759-1:2000,

Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories, classdesignated – Part 1: Steel flanges, NPS ½ to 24.EN 10002-1,

Metallic materials – Tensile testing – Part 1: Method of test at ambient temperature.4SIST EN 12952-2:2002

EN 12952-2:2001 (E)EN 10002-5,

Metallic materials – Tensile testing – Part 5: Method of testing at elevated temperature. EN 10021,

General technical delivery requirements for steel and iron products.EN 10028-1,

Flat products made of steels for pressure purposes – Part 1: General requirements.EN 10028-2,

Flat products made of steels for pressure purposes – Part 2: Non alloy and alloy steels with specifiedelevated temperature properties.EN 10028-3,

Flat products made of steels for pressure purposes – Part 3: Weldable fine grain steels, normalized.EN 10045-1,

Metallic materials – Charpy impact test – Part 1: Test method.EN 10160,

Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection method).EN 10164,

Steel products with improved deformation properties perpendicular to the surface of the product –Technical delivery conditions.EN 10204,

Metallic products – Types of inspection documents.EN 10213-1,

Technical delivery conditions for steel castings for pressure purposes – Part 1: General.EN 10213-2,

Technical delivery conditions for steel castings for pressure purposes – Part 2: Steel grades for useat room temperature and elevated temperatures.prEN 10216-1:1995,

Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 1: Non alloysteel tubes with specified room temperature properties. prEN 10216-2:1998,

Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 2: Non alloyand alloy steel tubes with specified elevated temperature properties. prEN 10216-3:1998,

Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 3: Non alloyand alloy fine grain steel tubes. prEN 10216-5:1998,

Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 5: Stainlesssteel tubes.prEN 10217-2:1998,

Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electricwelded non alloy and alloy steel tubes with specified elevated temperature properties.prEN 10217-3:1998,

Welded steel tubes for pressure purposes – Technical delivery conditions – Part 3: Alloy finegrain steel tubes. EN 10222-2,

Steel forgings for pressure purposes – Part 2: Ferritic and martensitic steels with specified elevatedtemperature properties.EN 10222-3,

Steel forgings for pressure purposes – Part 3: Nickel steels with specified low temperature properties.EN 10222-4,

Steel forgings for pressure purposes – Part 4: Weldable fine grain steels with high proof strength.EN 10222-5,

Steel forgings for pressure purposes – Part 5: Martensitic, austenitic and austenitic-ferritic stainlesssteels.EN 10228-1,

Non-destructive testing of steel forgings – Part 1: Magnetic particle inspection.EN 10228-2,

Non-destructive testing of steel forgings – Part 2: Penetrant testing.EN 10228-3,

Non-destructive testing of steel forgings – Part 3: Ultrasonic testing of ferritic or martensitic steelforgings.EN 10236,

Metallic materials – Tube – Ring expanding test.EN 10246-6,

Non-destructive testing of steel tubes – Part 6: Automatic full peripheral ultrasonic testing of seamlesssteel tubes for the detection of transverse imperfections.5SIST EN 12952-2:2002

EN 12952-2:2001 (E)EN 10246-7,

Non-destructive testing of steel tubes – Part 7: Automatic full peripheral ultrasonic testing of seamlessand welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.EN 10253-1,

Butt welding pipe fittings – Part 1: Wrought carbon steel for general use and without specific inspectionrequirements.prEN 10253-2:1999,

Butt welding pipe fittings – Part 2: Wrought carbon and ferritic alloy steel with specificinspection requirements.EN 10254,

Steel closed die forgings – General technical delivery conditions.EN 10273,

Hot rolled weldable steel bars for pressure purposes with specified elevated temperature properties.EN 12070,

Welding consumables – Wire electrodes, wires and rods for arc welding of creep-resisting steels –Classification.EN 12071,

Welding consumables – Tubular cored electrodes for gas shielded metal arc welding of creep-resistingsteels – Classification.EN 12074,

Welding consumables – Quality requirements for manufacture, supply and distribution of consumablesfor welding and allied processes.EN 12536,

Welding consumables – Rods for gas welding of non alloy and creep-resisting steels – Classification.prEN 12952-3:1997,

Water-tube boilers and auxiliary installations – Part 3: Design and calculation for pressureparts. prEN 12952-5:2000,

Water-tube boilers and auxiliary installations – Part 5: Workmanship and construction ofpressure parts of the boiler.prEN 12952-6:1997,

Water-tube boilers – Part 6: Inspection during construction, documentation and marking.prEN 12952-7:1998,

Water-tube boilers – Part 7: Requirements for equipment. prEN 12952-12:1998,

Water-tube boilers – Part 12: Requirements for feedwater and boiler water quality.prEN 13479-1:1999,

Welding consumables – Test methods and quality requirements for conformity evaluation ofconsumables – Part 1: Primary methods and evaluation.ENV 22605-3,

Steel products for pressure purposes – Derivation and verification of elevated temperature prop-erties – Part 3: An alternative procedure for deriving the elevated temperature yield or proof stress properties whendata are limited (ISO 2605-3:1985).ISO 2566-1,

Steel – Conversion of elongation values – Part 1: Carbon and low alloy steels.ISO 2566-2,

Steel – Conversion of elongation values – Part 2: Austenitic steels.ISO 3419,
Non alloy and alloy steel butt-welding fittings.ISO 5251,
Stainless steel butt-welding fittings.ISO 6303,

Pressure vessel steels not included in ISO 2604, Parts 1 to 6 – Derivation of long-time stress ruptureproperties.ISO 7005-1,

Metallic flanges – Part 1: Steel flanges.CR ISO 15608,

Welding-Guidelines for a metallic material grouping system (ISO/TR 15608:2000).6SIST EN 12952-2:2002

EN 12952-2:2001 (E)3
General requirements3.1

Selection of materials with regard to service conditionsThe manufacturer of the water-tube boilers shall select the material (including welding consumables) for themanufacture of the boilers so that, when the delivered material (including welding consumables) complies with therequirements specified in the material order and when the design rules in EN 12952-3 and the rules for thefabrication, inspection and testing of the boilers in EN 12952-5 and EN 12952-6 are observed, the boilers can beoperated without hazard under the service conditions (pressures, temperatures, environments, etc.) for the life timeprovided in the order for the boiler.The materials specified in clause 4 which satisfy the elongation and impact energy requirements of 4.2.5.3 and4.2.5.4 respectively shall not be considered prone to brittle fracture during manufacture and subsequent operationin accordance with the provisions of this European Standard. It is also considered that for operation within theparameters specified in EN 12952-3 using feedwater and boiler water as specified in prEN 12952-12 the selectedmaterials will not be significantly affected by ageing or chemical attack.3.2

Selection of materials with regard to fabricationThe selection of the materials of construction for pressure parts of water-tube boilers and to parts welded onpressure parts shall take into account the suitability of the material with regard to fabrication, e.g. cold and hotforming, weldability, expanding, and heat treatment.NOTE: The rules for forming or post-weld heat treatment are included in EN 12952-5.3.3

Material specification3.3.1

GeneralThe selection and order of materials for pressure parts shall be based on one of the following material specificationsfor pressure equipment in the form of:a) Harmonized European material Standardsb) European Material Data Sheets (EMDS)c) Particular material appraisals.3.3.2

European StandardsMaterials in accordance with harmonized European Standards shall be selected for types, treatment conditions anddimensions of products frequently used in Europe.NOTE: Materials in accordance with European Standards are given in annex A. 3.3.3

European approvals for materials European approvals for materials are intended for repeated use. They are established in accordance withprEN 764-4 and apply to materials or treatment conditions and product forms or dimensions not covered in aEuropean material Standard for pressure equipment.The European approvals for materials for pressure equipment result in European Material Data Sheets.NOTE: Reference of available European Material Data Sheets is published in the Official Journal of theEuropean Community.7SIST EN 12952-2:2002

EN 12952-2:2001 (E)3.3.4

Particular material appraisalsParticular material appraisals apply for individual cases as for example:a) a material or a product form or a thickness not covered by a European material Standard or EMDS intendedfor use in a particular pressure equipment;b) a product specified in a European material Standard or EMDS for materials for pressure equipment is intendedin an exceptional case for service conditions outside its specified range of application.Where relevant to the pressure equipment under consideration the requirements given in prEN 764-4 should beconsidered.3.4 Consideration of special material propertiesWhen materials are chosen with properties other than those specified in the material specification, or which mayinfluence the life time or the safe service behaviour of the water-tube boiler, they shall be taken into account whenselecting the material and its dimensions.NOTE: Examples are the scaling or ageing behaviour of the material.3.5

Contents of material specificationThe different types of specifications for materials for water-tube boilers include the clauses given in table 3.1 as aminimum.Table 3.1 — Content of specifications for materials for pressure partsClauses EN-StandardsEuropean material data sheetsParticularmaterialappraisalsunrestrictedrestricted ScopeXsee prEN 764-4ReferencesXDefinitions (X)RequirementsXInspectionXMarkingXGuidelines for processing the material etc.(welding, heat treatment, forming, flame-cut-ting)ZRestrictions on applicationZX=in all cases(X)=if necessaryZ=the relevant guidelines for fabrication and the restrictions on application are, where necessary, given inEN 12952-51) If applicable by reference to a European Standard for pressure purposes8SIST EN 12952-2:2002

EN 12952-2:2001 (E)3.6

Compliance and inspection documentation of materialsManufacturers and stockists of materials for pressure parts including welding consumables shall follow therequirements in accordance with prEN 764-5. They shall provide sufficient evidence of their capability to delivermaterials with consistent quality in accordance with the specifications and prEN 764-5.4

Materials for pressure parts4.1

Materials covered by harmonized European material Standards for pressure purposes4.1.1

Flat products, forgings, castings, tubes, fittings, flanges and valve bodiesThe material shall be ordered and delivered in accordance with annex A and the relevant European StandardsEN 10028-2, EN 10028-3, EN 10213-1, EN 10213-2, prEN 10216-2, prEN 10216-3, prEN 10217-2, prEN 10217-3,EN 10222-2, EN 10222-5, EN 10253-1, EN 10254 and EN 10273. The additional requirements given in this Partshall be taken into account. Harmonized supporting standards are prEN 1092-1, EN 1503-1, EN 1503-2,prEN 1759-1.4.1.2

Cast ironNodular cast iron shall not be used in the construction of pressure parts, except for valves and fittings as indicatedin prEN 12952-7, within the design limits specified in EN 12952-3. The use or other types of cast iron shall not bepermitted.4.1.3

Studs, bolts and nutsStuds, bolts and nuts shall be ordered and delivered in accordance with the requirements of EN 12952-3.4.1.4

Welding consumablesThe welding consumables (electrodes, filler wires, filler rods, fluxes, fusible inserts) shall be selected so that themechanical properties of the weld metal are compatible with the relevant requirements of the base materials fromEN 440, EN 499, EN 756, EN 758, EN 759, EN 1599, EN 1668, EN 12070, EN 12071, EN 12074 and EN 12536.The welding consumables shall be ordered and delivered according to specifications approved in accordance withEN 12074 and prEN 13479-1.4.1.5

Verification of propertiesThe properties shall conform to the requirements of the European material Standards. Compliance with the deliveryrequirements shall be documented in the inspection document.4.1.6

Requirements for non-destructive examinationThe non-destructive examination (NDE) requirement for various forms of material shall be as given below.a) plates:NDE in accordance with EN 10160 class S1.b) tubes – seamless:Seamless tubes shall be tested in accordance with prEN 10216 (Series) test category II . For unalloyed seamless tubes with design temperatures below 450 °C and design pressures below 42 bar, it ispermitted to perform category 1 in accordance with prEN 10216-2.9SIST EN 12952-2:2002

EN 12952-2:2001 (E)1) longitudinal imperfections:NDE in accordance with EN 10246-7Acceptance level:U2 sub-category B for cold finished and machined tubesU2 sub-category C for all other conditions2) transverse imperfection:NDE in accordance with prEN 10246-6Acceptance level:U2 sub-category C for all headers with outside diameters > 142 mm.3) tube ends:NDE in accordance with annex B of EN 10246-7;Acceptance level:U2 sub-category B or C as for longitudinal imperfections.NOTE: This is only mandatory for fixed length tubes. When the tubes are in close end to end contact, it canbe accepted that 100 % (full length) ultrasonic examination has taken place, and therefore no additional tubeend examination is required.c) tubes - welded:Welded tubes of test category II in accordance with prEN 10217- 2For unalloyed welded steel tubes with design temperatures below 450 °C and design pressures below 42 bar,it is permitted to perform category I in accordance with prEN 10217-2. However, the longitudinal weld shall besubject to ultrasonic examination.1) longitudinal imperfections:NDE in accordance with EN 10246-7Acceptance level:U2 sub-category C2) transverse imperfection:NDE in accordance with prEN 10246-6Acceptance level:U2 sub-category C for all headers with outside diameter > 142 mm.3) tube ends:NDE in accordance with annex B of EN 10246-7;Acceptance level:U2 sub-category C as for longitudinal imperfections.NOTE: This is only mandatory for fixed length tubes. When the tubes are in close end to end contact, it canbe assumed that 100 % (full length) ultrasonic examination has taken place, and therefore no additional tubeend examination is required. The requirements annex I, 3.1.2. and 3.1.3 of Pressure Equipment Directive97/23/EC should be taken into account.d) forgings:Forgings produced in accordance with EN 10222-2, EN 10222-3, EN 10222-4, prEN 10222-5 and solid barsproduced in accordance with EN 10222-2 required for the production of tubular sections by machining, shall betested in accordance with the requirements for tubes taking into consideration EN 10228-1 to EN 10228-3, steelclosed die forgings shall be delivered in accordance with EN 10254.e) steel castings:Steel castings shall be delivered and tested in accordance with EN 10213-1 and EN 10213-2.4.1.7

Inspection documentsThe type of inspection document to be applied shall be as specified in clause 6 and prEN 764-5.NOTE: Additional tests may be specified to cover additional or deviating requirements.4.1.8

Marking For reasons of traceability, each product shall be individually marked or, if delivered in bundles or boxes, may bemarked with a label secured to the bundle or box.10SIST EN 12952-2:2002

EN 12952-2:2001 (E)The marking shall at least cover the following:– the symbol of the manufacturer's works;– the steel grade or material grade or material number;– the cast number;– the stamp of the inspection representative if specified by the boiler manufacturer, or nominated in prEN 764-5;– the sample or batch number, or any other number by which the test sample can be identified;– the heat treatment condition (if relevant);– the direction of rolling for flat products (if relevant).Marking shall be carried out in accordance with the requirements of 6.3 of EN 12952-5. For methods of marking seeEuropean Standards for materials.4.2Material covered by European Approvals of material for pressure equipment – technicalrequirements4.2.1

GeneralThe material shall be covered by a European Material Data Sheet (EMDS) established in prEN 764-4. This datasheet shall meet the requirements in accordance with table 3-1.NOTE: The term "cast", when related to chemical composition, is used in the same way as in all Europeanbase materials standards and refers to the material in its molten condition.4.2.2

ManufactureIf the properties specified can be reliably achieved only when special methods of manufacture are applied (e.g.vacuum melting, treatment of the cast with nitrogen binding elements, or, in the case of welded tubes, definedwelding methods are applied), these methods shall be considered. Rimming steels and semi-killed steels shall not be used.4.2.3

Heat treatment conditionThe heat treatment condition of the material at the time of delivery shall be specified.NOTE: Plates to be hot formed may be supplied in any suitable condition, e.g. as rolled, hot finished,normalized and tempered.Carbon and carbon manganese steel plates (Steel group 1, 2) to be cold formed shall be supplied in the normalizedcondition.Low alloy steel plates (Steel group 4, 5) to be cold formed shall be supplied in the normalized and temperedcondition except that, where metallurgically suitable and where post-welded heat treatment will suffice as thetempering treatment, plates supplied in the normalized condition shall be permitted.Electrically welded tubes shall be supplied in the normalized condition.4.2.4

Chemical compositionThe chemical composition for the cast analysis and for the product analysis shall be specified. For steels intendedfor welding or forming, the values specified should not exceed the values given in table 4-1. Steels for which thevalues are higher than those given in table 4.1 may be used subject to appropriate welding approvals withappropriate heat treatment.11SIST EN 12952-2:2002

EN 12952-2:2001 (E)Table 4.1 — General requirements for the chemical composition of steels for pressure partsSteelMaximum content according to analysis% C% P% Scastproductcastproductcastproduct

Ferritic steels 0,23(0,25)0,035(0,040)0,030(0,035)

Austenitic steels0,10(0,11)0,035(0,040)0,015(0,020)Elements not specified in the EMDS shall not be added intentionally, except for finishing the cast. All reasonableprecautions shall be taken to prevent the addition of elements from scrap or other materials used in the manufacture,but residual elements may be present, provided the mechanical properties and applicability are not adverselyaffected.4.2.5

Mechanical and technological properties4.2.5.1

GeneralThe following property values shall be specified for each type of material, so that they reflect the specific propertiesof the individual steel grade.4.2.5.2

Tensile properties at room temperatureThe tests shall be carried out in accordance with EN 10002-1.a) Yield or proof strength valuesFor all ferritic steels, the minimum value for the upper yield strength ReH, min or, for cases where no yieldphenomenon occurs, the minimum proof strength for 0,2 % non-proportional extension Rp0,2, min shall be specified.For austenitic steels, the minimum proof strength values for 1 % non-proportional extension Rp1,0, min and, whereappropriate, additionally Rp0,2, min values shall be specified.b) Tensile strengthFor the tensile strength, a minimum value Rm, min and, unless no maximum yield or proof strength value isspecified, a maximum value Rm, max shall be specified.The specified minimum tensile strength shall be not less than 320 N/mm2. The specified maximum tensilestrength should not exceed the specified minimum tensile strength by more than – 120 N/mm2 for carbon and carbon manganese steels;– 150 N/mm2 for alloy steels, except austenitic steels;– 200 N/mm2 for austenitic steels.4.2.5.3

Elongation at fractureThe minimum percentage elongation at fractu
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