SIST EN 13480-2:2012
(Main)Metallic industrial piping - Part 2: Materials
Metallic industrial piping - Part 2: Materials
This Part of this European Standard specifies the requirements for materials (including metallic clad materials) for industrial piping and supports covered by EN 13480-1 manufactured from of metallic materials. It is currently limited to steels with sufficient ductility. This Part of this European Standard is not applicable to materials in the creep range.
Metallische industrielle Rohrleitungen - Teil 2: Werkstoffe
Dieser Teil der EN 13480 legt die Anforderungen an Werkstoffe (einschließlich Plattierungswerkstoffe) für Rohrleitungen nach der EN 13480-1 aus metallischen Werkstoffen fest; sie ist zur Zeit auf Stähle ausreichender Duktilität begrenzt. Dieser Teil gilt nicht im Zeitstandbereich. Die Norm legt das für diese Werkstoffe anzuwendende Konformitätsbewertungsverfahren fest. Ferner enthält sie Regeln für die Festlegung von technischen Lieferbedingungen für Werkstoffe für Rohrleitungen.
Tuyauteries industrielles métalliques - Partie 2: Matériaux
La présente partie de la présente norme européenne spécifie les exigences relatives aux matériaux (y compris les matériaux métalliques plaqués) pour tuyauteries industrielles et supports fabriqués à partir de matériaux métalliques et couverts par prEN 13480-1. Elle est limitée actuellement aux aciers ayant une ductilité suffisante. La norme ne s'applique pas dans le domaine du fluage.
NOTE D'autres matériaux seront ajoutés ultérieurement par amendements.
Elle spécifie les exigences relatives au choix, à l'inspection, au contrôle et au marquage des matériaux métalliques destinés à la fabrication des tuyauteries industrielles.
Kovinski industrijski cevovodi - 2. del: Materiali
Ta del tega evropskega standarda določa zahteve za materiale (vključno s kovinskimi materiali za prevleke) za industrijske cevovode in nosilce iz standarda EN 13480-1, ki so izdelani iz kovinskih materialov. Trenutno je omejen na jekla z ustrezno duktilnostjo. Ta del tega evropskega standarda se ne uporablja za materiale v območju tečenja.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kovinski industrijski cevovodi - 2. del: MaterialiMetallische industrielle Rohrleitungen - Teil 2: WerkstoffeTuyauteries industrielles métalliques - Partie 2: MatériauxMetallic industrial piping - Part 2: Materials77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific useICS:Ta slovenski standard je istoveten z:EN 13480-2:2012SIST EN 13480-2:2012en,fr,de01-oktober-2012SIST EN 13480-2:2012SLOVENSKI
STANDARDSIST EN 13480-2:2002/A2:2011SIST EN 13480-2:2002/A1:2011SIST EN 13480-2:20021DGRPHãþD
SIST EN 13480-2:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13480-2
June 2012 ICS 23.040.01 Supersedes EN 13480-2:2002English Version
Metallic industrial piping - Part 2: Materials
Tuyauteries industrielles métalliques - Partie 2: Matériaux Metallische industrielle Rohrleitungen - Teil 2: Werkstoffe This European Standard was approved by CEN on 8 May 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 13480-2:2012: ESIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 2 Contents Page Foreword .3 1 Scope .5 2 Normative references .5 3 Terms and definitions, symbols and untis .8 3.1 Terms and definitions .8 3.2 Symbols and units .9 4 Requirements for materials to be used for pressure containing parts in industrial piping .10 4.1 General .10 4.2 Special provisions .12 4.3 Technical delivery conditions .14 4.4 Marking .15 5 Requirements for materials to be used for non-pressure parts .15 Annex A (normative)
Grouping system for steels for pressure equipment .16 Annex B (normative)
Requirements for prevention of brittle fracture at low temperatures .18 B.1 General .18 B.2 Material selection and impact energy requirements .19 B.2.1 Method 1 – Code of practice .19 B.2.2 Method 2 .28 B.2.3 Method 3 — Fracture mechanics analysis .40 B.3 General test requirements .41 B.3.1 General .41 B.3.2 Sub-sized specimens .42 B.4 Welds .43 B.4.1 General .43 B.4.2 Welding procedure qualification .43 B.4.3 Production test plates .43 B.5 Materials for use at elevated temperatures .43 B.5.1 General .43 B.5.2 Materials .43 B.5.3 Welding procedure qualification and production test plates .44 B.5.4 Start up and shut down procedure .44 B.5.5 Pressure test .44 Annex C (normative)
Provisional technical delivery conditions for clad products for pressure purposes .52 C.1 Introduction .52 C.2 Requirements for the base material.52 C.3 Requirements for the cladding material .52 C.4 Qualification of the cladding procedure .53 C.5 Production tests .54 Annex D (informative)
European steels for pressure purposes .56 D.1 European Standards for steels and steel components for pressure purposes .56 D.2 European standardised steels grouped according to product forms .57 Annex Y (informative)
History of EN 13480-2 .80 Y.1 Differences between EN 13480:2002 and EN 13480:2012 .80 Annex ZA (informative)
Relationship between this
European
Standard and the Essential Requirements of EU Pressure Equipment Directive (97/23/EC) .81 Bibliography .82
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 3 Foreword This document (EN 13480-2:2012) has been prepared by Technical Committee CEN/TC 267 “Industrial piping and pipelines”, the secretariat of which is held by AFNOR. 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 December 2012, and conflicting national standards shall be withdrawn at the latest by December 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. 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(s), see informative Annex ZA, which is an integral part of this document.
This European Standard EN 13480 for metallic industrial piping consists of eight interdependent and not dissociable Parts which are:
Part 1: General; Part 2: Materials; Part 3: Design and calculation; Part 4: Fabrication and installation; Part 5: Inspection and testing; Part 6: Additional requirements for buried piping; CEN/TR 13480-7: Guidance on the use of conformity assessment procedures; Part 8: Additional requirements for aluminium and aluminium alloy piping. Although these Parts may be obtained separately, it should be recognised that the Parts are interdependent. As such the manufacture of metallic industrial piping requires the application of all the relevant Parts in order for the requirements of the Standard to be satisfactorily fulfilled. This European Standard will be maintained by a Maintenance MHD working group whose scope of working is limited to corrections and interpretations related to EN 13480.
The contact to submit queries can be found at http://portailgroupe.afnor.fr/public_espacenormalisation/CENTC267WG8/index.htm. A form for submitting questions can be downloaded from the link to the MHD website. After subject experts have agreed an answer, the answer will be communicated to the questioner. Corrected pages will be given specific issue number and issued by CEN according to CEN Rules. Interpretation sheets will be posted on the website of the MHD.
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 4 This document supersedes EN 13480-2:2002+A1:2010+A2:2010. This new edition incorporates the Amendments/the corrigenda which have been approved previously by CEN members, the corrected pages up to Issue 17 without any further technical change. Annex Y provides details of significant technical changes between this European Standard and the previous edition.
Amendments to this new edition may be issued from time to time and then used immediately as alternatives to rules contained herein. It is intended to deliver a new Issue of EN 13480:2012 each year, consolidating these Amendments and including other identified corrections.
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 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 5 1 Scope This Part of this European Standard specifies the requirements for materials (including metallic clad materials) for industrial piping and supports covered by EN 13480-1 manufactured from of metallic materials. It is currently limited to steels with sufficient ductility. This Part of this European Standard is not applicable to materials in the creep range.
NOTE Other materials will be added later by amendments. It specifies the requirements for the selection, inspection, testing and marking of metallic materials for the fabrication of industrial piping. 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 764-3:2002, Pressure equipment — Terminology Part 3: Definition of parties involved EN 1092-1:2007, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges EN 10028-1:2007+A1:2009+AC:2009, Flat products made of steels for pressure purposes — Part 1: General requirements EN 10028-2:2009, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties EN 10028-3:2009, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10028-4:2009, Flat products made of steels for pressure purposes — Part 4: Nickel alloyed steels with specified low temperature properties EN 10028-5:2009, Flat products made of steels for pressure purposes — Part 5: Weldable fine grain steels, thermomechanically rolled EN 10028-6:2009, Flat products made of steels for pressure purposes — Part 6: Weldable fine grain steels, quenched and tempered EN 10028-7:2007, Flat products made of steels for pressure purposes — Part 7: Stainless steels EN 10164:2004, 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, Steel castings for pressure purposes EN 10216-1:2002+A1:2004, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 6 EN 10216-2:2002+A2:2007, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties EN 10216-3:2002+A1:2004, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 3: Alloy fine grain steel tubes EN 10216-4:2002+A1:2004, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 4: Non-alloy and alloy steel tubes with specified low temperature properties EN 10216-5:2004, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 5: Stainless steel tubes EN 10217-1:2002+A1:2005, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties EN 10217-2:2002+A1:2005, 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 10217-3:2002+A1:2005, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 3: Alloy fine grain steel tubes EN 10217-4:2002+A1:2005, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 4: Electric welded non-alloy steel tubes with specified low temperature properties EN 10217-5:2002+A1:2005, 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 10217-6:2002+A1:2005, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 6: Submerged arc welded non-alloy steel tubes with specified low temperature properties EN 10217-7:2005, Welded steel tubes for pressure purposes — Technical delivery conditions – Part 7: Stainless steel tubes EN 10222-1:1998+A1:2002, Steel forgings for pressure purposes — Part 1: General requirements for open die forgings EN 10222-2:2000, Steel forgings for pressure purposes — Part 2: Ferritic and martensitic steels with specified elevated temperature properties EN 10222-3:1998, Steel forgings for pressure purposes — Part 3: Nickel steels with specified low temperature properties EN 10222-4:1998+A1:2001, Steel forgings for pressure purposes — Part 4: Weldable fine grain steels with high proof strength EN 10222-5:2000, Steel forgings for pressure purposes — Part 5: Martensitic, austenitic and austenitic-ferritic stainless steels EN 10253-2:2007, Butt-welding pipe fittings — Part 2: Non alloy and ferritic alloy steel with specific inspection requirements
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 7 EN 10269:1999+A1:2006, Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties EN 10272:2007, Stainless steel bars for pressure purposes EN 10273:2007, Hot rolled weldable steel bars for pressure purposes with specified elevated
temperature properties EN 12074:1999, Welding consumables — Quality requirements for manufacture, supply and distribution of consumables for welding and allied processes EN 13445-4:2009, Unfired pressure vessels — Part 4: Fabrication EN 13445-5:2009, Unfired pressure vessels — Part 5: Inspection and testing EN 13479:2004, Welding consumables — General product standard for filler metals and fluxes for fusion welding of metallic materials EN 13480-1:2012, Metallic industrial piping — Part 1: General EN 13480-3:2012, Metallic industrial piping — Part 3: Design and calculation EN 13480-4:2012, Metallic industrial piping — Part 4: Fabrication and installation EN 13480-5:2012, Metallic industrial piping — Part 5: Inspection and testing EN 20898-2:1993, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse thread EN ISO 148-1:2010, Metallic materials — Charpy pendulum impact test — Part 1: Test method
(ISO 148-1:2009) EN ISO 898-1:2009, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread (ISO 898-1:2009) 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) EN ISO 3506-1:1997, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs (ISO 3506-1:1997) EN ISO 3506-2:1997, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts (ISO 3506-2:1997) CEN ISO/TR 15608:2000, Welding — Guidelines for a metallic materials grouping system (ISO/TR 15608:2000) SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 8 3 Terms and definitions, symbols and untis 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13480-1:2012, EN 764-3:2002 and the following definitions apply. 3.1.1 minimum metal temperature TM lowest temperature determined for any of the following conditions: normal operations; start up and shut down procedures; possible process upsets, such as flashings of fluid, which have an atmospheric boiling point below 0 °C; during pressure or leak testing. Note to entry
See also 3.1.2 and 3.1.3. 3.1.2 temperature adjustment term TS temperature relevant to the calculation of the design reference temperature TR and dependent on the calculated tensile membrane stress at the appropriate minimum metal temperature
Note 1 to entry
Values for temperature adjustment term TS are given in Table B.2-12. Note 2 to entry
For tensile membrane stress reference is made to EN 13480-3:2012, clause 12. 3.1.3 design reference temperature TR temperature used for determining the impact energy requirements and determined by adding the temperature adjustment TS to the minimum metal temperature TM SMRTTT 3.1.4 impact test temperature TKV temperature at which the required resistance to impact energy is achieved Note to entry
See B.2. 3.1.5 impact energy KV energy absorbed by a sample of material when subjected to a Charpy-V-notch impact test in accordance with EN ISO 148-1:2010 3.1.6 reference thickness eB thickness of a component to be used to relate the design reference temperature TR of the component with its required impact test temperature TKV Note 1 to entry
See Tables B.2-2 to B.2-7 and Figures B.2-1 to B.2-11. SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 9 Note 2 to entry
The reference thickness eB, defined in Table B.4-1, is based on the nominal thickness (including corrosion allowance). For butt welded components eB is the nominal wall thickness of the component at the edge of the weld preparation. 3.2 Symbols and units For the purposes of this Part of this European Standard, the symbols and units of EN 13480-1:2012 apply together with those given in Table 3.2-1. Table 1 — Symbols and units Symbol Characteristic Unit aK Form factor – b width mm C constant – eB reference thickness mm G shear modulus N/mm2 (MPa) HB Brinell hardness – HV Vickers hardness – h maximum permissible reinforcement of weld mm KV Impact rupture energy J Lo length (gauge length) mm P pressure bar PLM parameter according to Larson-Miller – Re yield strength N/mm2 (MPa) Rm T t creep rupture strength for T in h at temperature t N/mm2 (MPa) S0 original cross section area mm2 TM minimum metal temperature C TKV material impact test temperature °C TR design reference temperature °C TS temperature adjustment term C linear expansion coefficient K-1 strain % NOTE
1 N/mm2 = 1 MPa SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 10 4 Requirements for materials to be used for pressure containing parts in industrial piping 4.1 General 4.1.1 Materials to be used for pressure containing parts in industrial piping shall meet the general requirements of 4.1 and the special provisions of 4.2 if applicable. Materials for pressure containing parts shall be ordered complying with the technical delivery conditions in 4.3. Marking of materials for pressure containing parts shall be performed in accordance with 4.4. Materials shall be selected in accordance with Annex A.
Materials shall be selected to be compatible with anticipated fabrication steps and to be suitable for the internal fluid and external environment. Both normal operating conditions and transient conditions occurring during fabrication, transport, testing, commissioning and decommissioning shall be taken into account when specifying the materials. NOTE 1 The requirements of 4.1 and 4.2 should also be fulfilled when technical delivery conditions are developed for European Standards for materials , European Approval of Materials or Particular Material Appraisals. NOTE 2 When technical delivery conditions for pressure-containing parts are developed, the structure and requirements of EN 764-4:2002 should be met. Exceptions should be technically justified. The materials shall be grouped in accordance with CEN ISO/TR 15608:2000 to relate manufacturing and inspection requirements to generic material types. NOTE 3 Materials have been allocated into these groups in accordance with their chemical composition and properties in relation to manufacture and heat treatment after welding. 4.1.2 Materials for pressure containing parts compliant with the requirements of this European Standard shall be certified on the basis of EN 10204:2004. NOTE
The certification should be in accordance with EN 764-5:2002. 4.1.3 The products shall be free from surface and internal defects which might impair their usability. 4.1.4 The specified minimum elongation of the steel after fracture shall be: 14 % for the transverse direction; and 16 % for the longitudinal direction, or where this is the less critical direction, the transverse direction; when measured on a gauge length, L0, calculated as follows:
SL065,50
(4.1-1) where
S0 is the original cross sectional area within the gauge length in order to fulfil formula 4.1-1.
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 11 However, lower elongation values than specified in 4.1 (e. g. for fasteners or castings) may also be applied, provided that appropriate measures shall be
taken by the parties concerned to compensate for these lower values and that compliance with the specific requirements is verifiable. NOTE Examples of appropriate measures: application of higher safety factors in design; performance of appropriate burst tests to demonstrate ductile material behaviour. 4.1.5 When measured on a gauge length other than that stated in 4.1.4, the minimum elongation after fracture shall be determined by converting the elongation given in 4.1.4 in accordance with: EN ISO 2566-1:1999 for carbon and low alloy steels; EN ISO 2566-2:1999 for austenitic steels.
4.1.6 Steels shall have a specified minimum impact energy measured on a Charpy V-notch impact test specimen (EN ISO 148-1:2010) as follows: 27 J for ferritic and 1,5 % to 5 % Ni alloyed steels; 40 J for steels of material groups 8, 9.3 and 10, at a test temperature in accordance with Annex B, but not higher than 20 C. The other requirements of Annex B shall also apply. 4.1.7 The chemical composition of steels intended for welding or forming shall not exceed the values given in Table 4.1-1. Exceptions shall be technically justified.
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 12 Table 4.1-1 — Maximum carbon, phosphorus and sulphur content for steel intended for welding or forming Material group (according to Table A.1) Maximum content of cast analysis % C % P % S Steels (1 to 6 and 9) 0,23 a 0,035 0,025 Ferritic stainless steels (7.1) 0,08 0,040 0,015 Martensitic stainless steels (7.2) 0,06 0,040 0,015 Austenitic stainless steels (8.1) 0,08 0,045 0,015 b Austenitic stainless steels (8.2) 0,10 0,035 0,015 Austenitic-ferritic stainless steels (10) 0,030 0,035 0,015 a
Maximum content of product analysis 0,25 %. b
For products to be machined a controlled sulphur content of 0,015 % to 0,030 % is permitted by agreement provided the resistance to corrosion is satisfied for the intended purpose.
4.2 Special provisions 4.2.1 Special properties 4.2.1.1 General Where the behaviour of a material can be affected by manufacturing processes or operating conditions, to an extent that would adversely affect the safety or service life of the piping system, this shall be taken into consideration when specifying the material. Adverse effects can arise from: manufacturing processes: e.g. degree of cold forming, heat treatment; operating conditions: e.g. hydrogen embrittlement, corrosion, scaling, ageing behaviour after cold forming. 4.2.1.2 Lamellar tearing Where lamellar tearing due to the joint design and loading needs to be addressed (see EN 13480-3:2012, 7.2.3.3), steels shall be used which have improved deformation properties perpendicular to the surface shall be specified and verified in accordance with EN 10164:2004. NOTE For guidance see EN 1011-2:2001.
SIST EN 13480-2:2012
EN 13480-2:2012 (E) Issue 1 (2012-06) 13 4.2.2 Design temperature above 20 C 4.2.2.1 A material shall only be used for pressure parts within the range of temperatures for which the material properties required by EN 13480-3:2012 are defined in the technical specification for the material. If the technical delivery condition does not contain the specific material values required for the design temperature ts the values required in EN 13480-3:2012 for the design shall be determined by linear interpolation between the two adjacent values. Values shall not be rounded up.
For other than austenitic and austenitic-ferritic stainless steels, the specified value of ReH (Rp0,2) at room temperature may be used for temperatures less than or equal to 50 C. Interpolation for design temperatures between 50 C and 100 C shall be performed with the values of ReH at room temperature and at 100 °C, and using 20 °C as the starting point for interpolation. Above 100 C linear interpolation shall be performed between the tabulated values given in the appropriate material standards. In the case of creep rupture strength values or strength values for plastic strain in a given time, linear interpolation shall be permissible only if the difference between the two temperatures serving as starting points for the interpolation is equal to or less than 10 C. 4.2.2.2 Materials in the creep range shall not be used unless the creep rupture strength values or strength values for plastic strain needed for design are specified in the base material specification. The manufacturer of the piping system installation shall be assured by the material supplier that the material supplied i
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