SIST EN 10253-2:2021

SLOVENSKI STANDARD
oSIST prEN 10253-2:2018
01-januar-2018
Cevni fitingi za soležne zvare - 2. del: Nelegirana in feritna legirana jekla s
posebnimi zahtevami kontrole
Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific
inspection requirements
Formstücke zum Einschweißen - Teil 2: Unlegierte und legierte ferritische Stähle mit
besonderen Prüfanforderungen
Raccords à souder bout à bout - Partie 2 : Aciers non alliés et aciers ferritiques alliés
avec contrôle spécifique
Ta slovenski standard je istoveten z: prEN 10253-2
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.140.20 Visokokakovostna jekla Stainless steels
77.140.45 Nelegirana jekla Non-alloyed steels
oSIST prEN 10253-2:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10253-2:2018

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oSIST prEN 10253-2:2018


DRAFT
EUROPEAN STANDARD
prEN 10253-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2017
ICS 77.140.20; 23.040.40; 77.140.45 Will supersede EN 10253-2:2007
English Version

Butt-welding pipe fittings - Part 2: Non alloy and ferritic
alloy steels with specific inspection requirements
Raccords à souder bout à bout - Partie 2 : Aciers non Formstücke zum Einschweißen - Teil 2: Unlegierte und
alliés et aciers ferritiques alliés avec contrôle legierte ferritische Stähle mit besonderen
spécifique Prüfanforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
ECISS/TC 110.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10253-2:2017 E
worldwide for CEN national Members.

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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 10
4 Symbols and abbreviations . 11
5 Classification of grades and designation . 12
5.1 Classification of grades . 12
5.2 Designation of steel grades . 12
5.3 Designation of fittings . 12
5.3.1 General . 12
5.3.2 Elbows and return bends . 12
5.3.3 Reducers . 12
5.3.4 Tees . 13
5.3.5 Caps . 13
6 Information to be supplied by the purchaser . 13
6.1 Mandatory information . 13
6.2 Options . 13
6.3 Examples of an order . 15
6.3.1 Example 1 . 15
6.3.2 Example 2 . 15
6.3.3 Example 3 . 15
6.3.4 Example 4 . 15
6.3.5 Example 5 . 15
7 Resistance to internal pressure . 15
7.1 General . 15
7.2 Fittings of type A . 16
7.3 Fittings of type B . 16
8 Manufacturing process . 16
8.1 Steelmaking process . 16
8.2 Product making process for fittings and heat treatment . 16
8.2.1 Product making process . 16
8.2.2 Welding as part of the manufacturing process of the fitting . 17
8.2.3 Heat treatment condition . 18
9 Technical requirements. 19
9.1 General . 19
9.2 Chemical composition . 20
9.2.1 Cast analysis . 20
9.2.2 Product analysis . 20
9.3 Mechanical properties . 25
9.4 Creep rupture strength values . 34
9.5 Weldability . 34
10 Appearance and internal soundness (delivery conditions) . 34
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10.1 Definitions of imperfections . 34
10.2 Appearance . 36
10.3 Internal soundness . 36
11 Dimensions and tolerances . 36
11.1 Dimensions . 36
11.1.1 General . 36
11.1.2 Elbows . 37
11.1.3 Tees . 37
11.1.4 Reducers . 38
11.1.5 Caps . 39
11.1.6 Preferred diameters and wall thicknesses . 39
11.2 Dimensional tolerances . 41
11.2.1 Diameter . 41
11.2.2 Out of roundness . 42
11.2.3 Wall thickness tolerances . 42
11.2.4 Tolerances on specific dimensions and form . 42
11.2.5 Corrugation . 43
11.3 Performance of the end bevelling . 44
12 Inspection . 45
12.1 Type of inspection . 45
12.2 Inspection documents . 45
12.2.1 Type of inspection documents . 45
12.2.2 Content of inspection documents . 45
12.3 Summary of inspection and testing . 46
13 Sampling . 47
13.1 Frequency of tests . 47
13.1.1 Test unit . 47
13.1.2 Number of test pieces per test unit . 49
13.2 Preparation of samples and test pieces . 49
13.2.1 Samples for product analysis . 49
13.2.2 Samples and test pieces for mechanical tests. 49
13.2.3 Test piece for the tensile test on the base material. 49
13.2.4 Test piece for the tensile test transverse to the weld . 49
13.2.5 Test piece for the weld bend test . 49
13.2.6 Test piece for the impact test . 49
14 Test methods . 50
14.1 Chemical analysis . 50
14.2 Tensile test on the base material . 50
14.2.1 At room temperature . 50
14.2.2 At elevated temperature . 50
14.3 Transverse tensile test on the weld . 51
14.4 Hardness test . 51
14.5 Weld bend test . 51
14.6 Impact testing . 51
14.7 Dimensional testing . 52
14.8 Visual testing (VT) . 52
14.9 Non-destructive testing (NDT) . 52
14.9.1 Personnel . 52
14.9.2 NDT of the weld . 52
14.9.3 NDT of cold formed tees . 53
14.9.4 Detection of laminar imperfections . 53
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14.9.5 NDT for the detection of longitudinal imperfections . 53
14.9.6 NDT for the detection of transverse imperfections . 53
14.9.7 NDT of bars and forgings . 53
14.10 Positive material identification (PMI) . 54
15 Marking . 54
16 Protection and packaging . 55
Annex A (normative) Dimensions . 56
A.1 General . 56
A.2 Elbows . 56
A.3 Tees . 58
A.4 Reducers . 60
A.5 Caps . 62
Annex B (normative) Determination of pressure factors and wall thickness . 64
B.1 General . 64
B.2 Symbols and units . 64
B.3 Minimal and nominal wall thickness . 67
B.4 Pressure factors of fittings of type A . 67
B.4.1 Pressure factor . 67
B.4.2 Elbows . 68
B.4.3 Tees . 68
B.4.4 Reducers . 71
B.4.5 Caps . 75
B.5 Wall thicknesses of fittings of type B . 77
B.5.1 Elbows . 77
B.5.2 Tees . 79
B.5.3 Reducers . 81
B.5.4 Caps . 86
Annex C (normative) Pressure factor tables for Fittings of type A . 88
C.1 General . 88
C.2 Elbows . 88
C.3 Tees . 91
C.4 Reducers . 100
C.5 Caps . 111
Annex D (informative) Wall thickness tables for fittings of type B . 112
D.1 General . 112
D.2 Elbows . 112
D.3 Tees . 115
D.4 Reducers . 122
D.5 Caps . 138
Annex E (informative) Recommended heat treatment temperatures . 140
Annex F (informative) Creep rupture strength values . 141
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU . 147
Bibliography . 149

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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
European foreword
This document (prEN 10253-2:2017) has been prepared by Technical Committee ECISS/TC 110 "Steel
tubes, and iron and steel fittings", the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10253-2:2007.
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 2014/68/EU.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
EN 10253 comprises a series of European Standards about Butt-welding pipe fittings, namely:
— Part 1: Wrought carbon steel for general use and without specific inspection requirements;
— Part 2: Non alloy and ferritic alloy steels with specific inspection requirements;
— Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection
requirements;
— Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection
requirements.
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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
Introduction
In writing this European Standard the competent committee recognized that there are two broad types
of products commonly used, and decided to reflect these in the standard by differentiating between two
parts.
EN 10253-1 describes fittings without formal reference to the pressure resistance, which are not
intended to be used in applications, covered by the Pressure Equipment Directive (2014/68/EU)
classes I to IV.
EN 10253-2 defines two types of fittings: Type A fittings have the same wall thickness at the welding
ends and at the body of the fitting than a pipe having the same specified wall thickness. Their resistance
to internal pressure is, in general, less than that of a straight pipe with the same dimensions. Type B
fittings showing increased wall thickness at the body of the fitting are designed to resist the same
internal pressure as a straight pipe with same dimensions. These two types of fittings are intended to be
used in applications covered by the EU Directive 2014/68/EU. According to this Directive and further
interpretation guidelines (e.g. guideline 7/19), seamless fittings are considered as materials whereas
welded fittings are considered as components. Therefore, in some areas of this European Standard,
provisions for seamless and welded fittings are different.
The selection of steel type and requirement level depend on many factors; the properties of the fluid to
be conveyed, the service conditions, the design code and any statutory requirements should all be taken
into consideration. Therefore this standard gives no detailed guidelines for the application of different
parts. It is the ultimate responsibility of the user to select the appropriate part for the intended
application.
IMPORTANT — This document contains, in Annexes B, C and D, tables which have to be re-
examined with regard to their correctness before publication of the standard. In the context of
this CEN-Enquiry readers of this draft are therefore invited to comment on any amendments that
may be required, particularly with regard to the tables in Annexes B, C and D.
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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
1 Scope
This draft European Standard specifies the technical delivery requirements for seamless and welded
butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of
carbon and alloy steel in two test-categories which are intended for pressure purposes at room
temperature, at low temperature or at elevated temperatures, and for the transmission and distribution
of fluids and gases.
It specifies:
a) type of fittings;
1) type A: Butt-welding fittings with reduced pr
...