EN 10253-2:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific inspection requirementsCevni fitingi za soležne zvare - 2. del: Nelegirana in feritna legirana jekla s posebnimi zahtevami kontroleRaccords a souder bout a bout - Partie 2: Aciers non alliés et aciers ferritiques alliés avec contrôle spécifiqueFormstücke zum Einschweissen - Teil 2: Unlegierte und ferritisch legierte Stähle mit besonderen PrüfanforderungenTa slovenski standard je istoveten z:EN 10253-2:2007SIST EN 10253-2:2008en,de77.140.45Nelegirana jeklaNon-alloyed steels23.040.40Kovinski fitingiMetal fittingsICS:SLOVENSKI
STANDARDSIST EN 10253-2:200801-januar-2008

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10253-2October 2007ICS 77.140.45; 23.040.40 English VersionButt-welding pipe fittings - Part 2: Non alloy and ferritic alloysteels with specific inspection requirementsRaccords à souder bout à bout - Partie 2: Aciers non alliéset aciers ferritiques alliés avec contrôle spécifiqueFormstücke zum Einschweißen - Teil 2: Unlegierte undlegierte ferritische Stähle mit besonderenPrüfanforderungenThis European Standard was approved by CEN on 18 August 2007.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10253-2:2007: E

Determination of pressure factors and wall thickness.55 Annex B (informative)
Pressure factor tables for Fittings of type A.79 Annex C (informative)
Wall thickness tables for Fittings of type B.97 Annex D (informative)
Recommended heat treatment temperatures.122 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC.123 Bibliography.125

NOTE 2 Where a purchaser has responsibilities under this EU Directive, this standard will provide a presumption of conformity with the essential requirements of the Directive so identified in Annex ZA. 3.5 weld during manufacture weld made for obtaining a fitting NOTE This term does not include the tube welds when a tube is used as starting material.

; non measurable value (See EN ISO 6708) ; D Specified outside diameter for elbows, return ends, equal tees, caps and the major outside diameter for reducers and reducing tees, expressed in millimetres ; D1 Specified minor outside diameter for reducers and reducing tees, expressed in millimetres ; T Specified wall thickness at the welding ends for elbows, return bends, equal tees and bends or on the D end for reducers and reducing tees, expressed in millimetres ; T1 Specified wall thickness on the D1 welding end of reducers and reducing tees, expressed in millimetres ; ID Internal diameter at the welding ends of elbows, return bends, equal tees and at the major welding end of reducers and reducing tees (ID = D -2T) ; ID1 Internal diameter at the minor welding end of reducers and reducing tees (ID1 = D1 – 2T1) ; C Centre to centre distance for return bends (C ≈ 2R), expressed in millimetres ; B Back to face distance for return bends, expressed in millimetres ; F Distance from the axis of the branch outlet to the face of the centre body of tees, expressed in millimetres ; G Distance from the axis of the centre line to the face of the branch outlet of reducing tees, expressed in millimetres ; k Total height for caps, expressed in millimetres ; L Face to face distance for reducers, expressed in millimetres ; X Tolerance on the form of fittings ; r Inside knuckle radius of cap ; R Bending radius of elbows and return bends, expressed in millimetres ; R1 Inside spherical radius of cap ; P Tolerance on the form of elbows ; W Distance from the extrados to the centre of
a 90° elbow at the welding ends ;

Minimum 0,2 % proof strength at room temperature, expressed in megapascals ; A Percentage of elongation at rupture, with reference to gauge length of 5,65 oS. 5 Designations 5.1 Designation of steel grades For fittings covered by this European Standard the designation shall consist of :  number of this European Standard (EN 10253-2) ; plus either :  steel name in accordance with EN 10027-1 ; or  steel number allocated in accordance with EN 10027-2. 5.2 Designation of fittings Elbows and return bends are designated by the model (2D, 3D or 5D), the angle, the outside diameter D. Reducers are designated by the model (concentric or eccentric), the major diameter D, the minor diameter
D
1. Equal tees are designated by the outside diameter D. Reducing tees are designated by the major diameter D, the minor diameter D 1. Caps are designated by the outside diameter D. 6 Information to be supplied by the purchaser 6.1 Mandatory information The following information shall be supplied by the purchaser at the time of enquiry and order: a) quantity required (number of pieces) ; b) reference to this European Standard ; c) type of fitting, A or B ; d) designation of fittings (see 5.2) and the wall thickness T(T1 ) ; e) designation of the steel grade (see 5.1) ;

1000 elbows - EN 10253-2 - Type A – Model 3D - 90°- 114,3 X 6,3 - P265GH 6.3.2 Example 2 500 reducing tees in accordance with this European Standard of type B (having an increased wall thickness for the body of the fitting), with dimensions 114,3 X 6,3 - 88,9 X 4,0 and made of steel grade P265GH.
500 reducing tees - EN 10253-2 – Type B - 114, 3X6,3 - 88,9 X 4,0 - P265GH 7 Resistance to internal pressure 7.1 General The Pressure Equipment Directive (EU Directive 97/23/EC — Annex Ι — subclause 2.2.2) imposes that the design for adequate strength shall be based on a calculation method or, with restrictions, on an experimental method. The resistance to internal pressure of a fitting conforming to this European Standard shall be determined according to the relevant design rules laid down in e.g. EN 13480-3. The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the manufacturer of the pressure equipment (See Annex ZA for presumption of conformity of the material to the ESR's of Directive 97/23/EC). For fittings of type A in carbon steel grades, when the manufacturer is able to guarantee that the minimum yield strength of the delivered products is higher than the specified minimum yield strength, the wall thickness may be reduced such as the product of the reduced thickness times the minimum product yield strength shall at least equal the product of the specified wall thickness times the specified minimum yield strength of the specified grade. For such products the mechanical properties shall be determined on the finished product and they shall be clearly identified on the inspection documents and by specific marking. See 12.2 for relevant documents, 12.3 for testing and Clause 15 for relevant information on marking. 7.2 Fittings of type A Type A fitting 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 less than that of a pipe with the same specified diameter, wall thickness and of the same steel grade. The determination of the reducing pressure factor is given in Annex A and tables of pressure factors are given in Annex B. For reducers the wall thickness at the conical section shall be the specified wall thickness at the major end.

Bending b Pressed in die c Rolled, forged followed by machining Bending b Pressed in die c Machining from round bars (DN <<<< 50) d Elbows 1, 2, 4, 5 1, 2, 3, 4, 5 - 1, 2, 4, 5 1, 2, 3, 4, 5 - Tees - 1, 2, 3, 4, 5 4, 5 - 1, 2, 3, 4, 5 - Reducers - 1, 2, 3, 4, 5 4, 5 - 1, 2, 3, 4, 5 5 Caps - 1, 2, 3, 4, 5 4, 5 - 1, 2, 3, 4, 5 5 a Starting material :
1 seamless pipe ;
2 welded pipe ;
3 plate and strip ;
4 forging ;
5 bar. b When producing elbows from welded pipe, the position of the weld is at the discretion of the manufacturer. c For these processes welding with or without filler metal may be used (see 8.2.2.1). When filler metal is used it shall be compatible with the parent metal. d The method of manufacture shall be reported. Option 2 : The method of manufacturing and/or details of the manufacturing process, e.g. welding operations or position of the weld before forming shall be as specified on the purchase order. Option 3 : The starting product form to be used and/or its delivery condition shall be as specified on the purchase order. Option 4 : The method of manufacture shall be reported. 8.2.2 Welding as part of the manufacturing process of the fitting 8.2.2.1 General When producing fittings from plate or strip, welding is considered being a part of the manufacturing of fittings, and :  welding process/procedures shall be qualified in accordance with EN ISO 15614-1 ;  welders and/or welding operators shall be qualified in accordance with EN 287-1 and/or EN 1418. For pressure equipment in categories II, III, and IV, (of Directive 97/23 EC) the operating procedures and the personnel shall be approved by a competent third-party. All welds carried out during the manufacture of the fitting shall be fusion weld type. All welds shall have complete penetration. Local repair of weld seam which have been made with filler metal is permitted provided that the repair procedure/welders are qualified in accordance with the relevant part of the above mentioned standards and the repaired area is heat treated and non destructively tested in the same way as the original weld. All joints welded with filler metal shall be finished in accordance with the requirements in 8.2.2.1 and 8.2.2.2.

Dimensions in millimetres Base metal thickness ( T ) Reinforcement T < 5 1,0 5 ≤ T ≤ 10 0,2t 10 < T ≤ 25 3,0 25 < T ≤ 50 3,0 inside 5,0 outside 50 < T 5,0 inside 6,0 outside The finished joint criteria for the fittings made from welded pipe without filler metal shall be governed by the standard defining the starting material. 8.2.3 Heat treatment condition The fittings shall be delivered in one of the final heat-treated conditions given in Table 3. Recommended heat treatment temperatures are given in Annex D. In case of hot deformation fittings in carbon steel grades (see Clause 3) and steel grade 16Mo3 may be delivered without heat treatment if hot deformation produces a technically equivalent metallurgical structure with the corresponding mechanical characteristics.

; NT = Normalized and tempered. QT = Quenched and tempered
; I = Isothermal annealing. a These heat treatments are identical to those described in the corresponding tube standards. b For these steel grades it may be necessary in the case of wall thickness T above 25 mm or T/D > 0,15 to apply quenching and tempering in order to achieve the intended structure and material properties. The decision shall be left to the discretion of the manufacturer but shall be stated to the customer at the time of enquiry and order. Steel tubes treated in such a way shall be designated by the steel name supplemented by the symbol “+QT “.

0,01 b 0,30 b 0,04 b 0,02 b Cr+Cu+Mo+Ni ≤ 0,70 P265TR2 1.0259 0,20 0,40 1,40 0,025 0,020 ≥ 0,020 c 0,30 b 0,30 b 0,08 b
0,01 b 0,30 b 0,04 b 0,02 b « P235GH 1.0345 0,16 0,35 1,20 0,025 0,020 ≥ 0,020 c 0,30 0,30 0,08 0,01 b 0,30 0,04 b 0,02 b « P265GH 1.0425 0,20 0,40 1,40 0,025 0,020 ≥ 0,020 c 0,30 0,30 0,08 0,01 b 0,30 0,04 b 0,02 b « 16Mo3 1.5415 0,12-0,20 d 0,35 0,40-0,90 0,025 0,020 ≤ 0,040 0,30 0,30 0,25-0,35 - 0,30 - - - 10CrMo5-5 1.7338 0,15 0,50-1,00 0,30-0,60 0,025 0,020 ≤ 0,040 1,00-1,50 0,30 0,45-0,65 - 0,30 - - - 13CrMo4-5 1.7335 0,10-0,17 d 0,35 0,40-0,70 0,025 0,020 ≤ 0,040 0,70-1,15 0,30 0,40-0,60 - 0,30 - - - 10CrMo9-10 1.7380 0,08-0,14 0,50 0,30-0,70 0,025 0,020 ≤ 0,040 2,00-2,50 0,30 0,90-1,10 - 0,30 - - - X11CrMo5 1.7362 0,08-0,15 0,15-0,50 0,30-0,60 0,025 0,020 ≤ 0,040 4,00-6,00 0,30 0,45-0,65 - - - - - X11CrMo9-1 1.7386 0,08-0,15 0,25-1,00 0,30-0,60 0,025 0,020 ≤ 0,040 8,00-10,00 0,30 0,90-1,10 - - - - - X10CrMoV Nb9-1 1.4903 0,08-0,12 0,20-0,50 0,30-0,60 0,020 0,010 ≤ 0,040 8,00-9,50 0,30 0,85-1,05 0,06-0,100,40 - 0,18-0,25N
: 0,030-0,070 P355N P355 NH 1.0562 1.0565 0,20 0,50 0,90-1,70 0,025 0,020 ≥ 0,020 c 0,30 b 0,30 e 0,08 e 0,05 0,50 0,04 0,10 N ≤ 0,02 Nb+Ti+V ≤ 0,12 P355NL1 1.0566 0,18 0,50 0,90-1,70 0,025 0,020 ≥ 0,020 c 0,30 b 0,30 e 0,08 e 0,05 0,50 0,04 0,10 N ≤ 0,02 Nb+Ti+V ≤ 0,12 P215NL 1.0451 0,15 0,35 0,40-1,20 0,025 0,020 ≥ 0,020 c 0,30 0,30 0,08 0,10 0,30 0,04 0,02 - P265NL 1.0453 0,20 0,40 0,60-1,40 0,025 0,020 ≥ 0,020 c 0,30 0,30 0,08 0,10 0,30 0,04 0,02 - 12Ni14 1.5637 0,15 0,15-0,35 0,30-0,80 0,025 0,010 - - 0,30 - - 3,25-3,75 - 0,05 - X10Ni9 1.5682 0,13 0,15-0,35 0,30-0,80 0,020 0,010 - - 0,30 0,10 - 8,50-9,50 - 0,05 - L290NB 1.0484 0,17 0,40 1,20 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,04 0,05 N ≤
0,012 CEV ≤ 0,42 L360NB 1.0582 0,20 0,45 1,60 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,04 0,15 N ≤
0,012 V+Nb+Ti
≤ 0,15 CEV ≤ 0,45 L360QB 1.8948 0,16 0,45 1,40 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,04 0,05 N ≤
0,012 CEV ≤ 0,42 L415NB 1.8972 0,21 0,45 1,60 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,04 0,15 N ≤
0,012 V+Nb+Ti
≤ 0,15 L415QB 1.8947 0,16 0,45 1,60 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,04 0,08 N ≤
0,012 V+Nb+Ti
≤ 0,15 CEV ≤ 0,43 L450QB 1.8952 0,16 0,45 1,60 0,025 0,020 0,015-0,0600,30 0,25 0,10 f 0,05 0,30 0,06 0,09 N ≤
0,012 V+Nb+Ti
≤ 0,15 CEV ≤ 0,45 Elements not included in this table shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for finishing the cast. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steelmaking process. a For elements where only one value is indicated without further information, this value shall be regarded as a maximum. b The content of these elements need not be reported unless intentionally added to the cast. c This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements which shall be reported. d For wall thicknesses greater than 30 mm, the carbon content may be increased by 0,02% for cast and product analysis. e The sum of the percentage by mass of the three elements chromium, copper and molybdenium shall not exceed 0, 45 %. f Al / N ≤ 2.

> 0,40 to ≤ 1,00 ± 0,06 Mn ≤ 1,00 ± 0,05
> 1,00 to ≤ 1,70 ± 0,10 P ≤ 0,025 + 0,005 S ≤ 0,010 + 0,003
> 0,010 ≤ 0,020 + 0,005 Al ≤ 0,060 ± 0,005 Cr ≤ 1,00 ± 0,05
> 1,00 to ≤ 10,00 ± 0,10 Cu ≤ 0,30 ± 0,05 Mo ≤ 0,35 ± 0,03
> 0,35 to ≤ 1,10 ± 0,04 N ≤ 0,012 ± 0,01 Nb ≤ 0,10 ± 0,005 Ni ≤ 0,35 ± 0,05
> 0,35 to ≤ 9,50 ± 0,07 Ti ≤ 0,060 + 0,010 V ≤ 0,10 + 0,01
> 0,10 to ≤ 0,25 ± 0,03 a If several product analyses are carried out on one cast, and the contents of an individual element determined lie outside the permissible range of the chemical composition specified for the cast analysis, then it is only allowed to exceed the permissible maximum 9.3 Mechanical properties The mechanical properties of the finished product shall conform to the requirements given in Tables 6 to 9. For the impact properties in the weld (where applicable), the values of the relevant grade in the transverse direction shall apply. Option 8 : For the grades listed in Table 7, the proof strength at elevated temperature shall be verified. The test temperature shall be specified at the time of enquiry and order.
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