32
better fittings. best connections. Information Service EN (European Standards) vs. DIN (National Standards) (en)
better fi ttings. best connections.
Information ServiceEN (European Standards) vs. DIN (National Standards)
(en)
Fittings for butt-welding 3 – 5
Comparison EN 10253-2/-4 with
DIN 2605, 2609, 2615, 2616, 2617 6 – 29
Type of fi tting 6 – 7
Manufacturing process of the fi ttings 8 – 9
Heat treatment for fi ttings 8 – 9
Grades of steel 10 – 13
Mechanical properties 14 – 15
Dimensions and tolerances 14 – 19
Dimensions 18 – 19
Weld end types 20 – 21
Inspection requirements 20 – 25
Inspection lot sizes 24 – 25
Marking 26 – 28
Preparation for shipment, handling and packaging 28 – 29
This information on the European standards for butt-welding fi ttings is an exclusive service of the ERNE FITTINGS GmbH, published for TUBE in April 2010.
2
The European standards (EN standards) for butt-welding fi ttings have been published at random intervals up until 2009 and replace the correspon-ding previous national standards (AFNOR, BS, DIN, ÖNORM).
This brochure contains important information regarding the content of the standards especially with respect to the comparison made with the previous, applicable DIN standards.
The corresponding national standards were withdrawn after all 4 sections of the EN-10253 were published. The following is a reference to the corresponding DIN standards.
Information Service
3
Fittings for butt-welding
DIN 2605 DIN 2609 DIN 2615 DIN 2616 DIN 2617
EN 10253-1 Wrough carbon steel for general use and without specifi c inspection requirments.
EN 10253-2 Non alloy and ferritic alloy steel with specifi c inspection requirements.
EN 10253-3 Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specifi c inspection requirements.
EN 10253-4 Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specifi c inspection requirements.
Sections 1 and 3 (EN 10253-1, EN 10253-3) describe fi ttings which do not satisfy the important safety standards in terms of the Pressure Equipment Directive (97/23/EC) and which cannot be used for applications according to Article 3, Paragraph 3, of the Pressure Equipment Directive (97/23/EC). These sections of the EN 10253 will therefore not be considered in this brochure.
4
EN 10253-2
Fittings for butt-welding; non alloy and ferritic alloy steel with specifi c inspection requirements. (designated as Section -2 in this brochure)
EN 10253-4
Fittings for butt-welding; austenitic and austenitic-ferritic (duplex) stainless steels without specifi c inspection requirements. (designated as Section -4 in this brochure)
Seamless and welded fi ttings for butt-welding are: elbows, concentric and excentric reducers, tees with equal and reduced ends and caps.
The EN 10253-2 and -4 support the underlying safety requirements of the Pressure Equipment Directive (97/23/EC) and are harmonized standards for materials.
According to the Pressure Equipment Directive (97/23/EC) and other guidelines (e.g. Guideline 7/19) seamless fi ttings are considered to be materials whereas welded fi ttings, including those that are made from welded pipes, are considered to be components. Details are listed in the informative Appendix ZA of the standards.
5
These standards defi ne:
– The type of fi tting– The type of steel– The mechanical properties– The dimensions and tolerances– The test requirements– The test certifi cates (inspection certifi cate 3.1 or if optionally requested 3.2 according to EN 10204)– Marking– The preparation for shipment or protective measures and packaging; (the surface protection of the fi ttings is implied under protective measures)
The fi tting are designated as follows:
– Specifi cation of the EN-Standard (EN 10253-2/-4) and specifi cation of the type (A or B)– Material abbreviation or material number– Type of fi tting (bend, tee, reducer, cap) – Outside diameter D/D1*– Wall thickness T/T1** – The bending radius and angle in addition for elbows
*) small outside diameter for tees with reduced junction and reducer **) wall thickness on the weld end D1 for reducers and tees with reduced junction
The selection of the fi ttings and the steel material is the responsibility of the user.
6
EN standards
EN 10253-2/-4
The EN standards describe the basic specifi cations which can be supplemented with additional options upon request and placement of orders.
Type of fi tting
Typ A
Decreased pressure factor Same wall thickness on the weld ends and on the fi tting body as for a pipe with the same specifi ed wall thickness. Their resistance to internal pressure is less than that of a pipe with the same dia-meter, same wall thickness and made of the same grade of steel.
The required calculation methods are based on the calculation standards defi ned in EN 13480-3 (Section -2 in Appendix A, Section -4 in Appendix B). The respective utilization rate for some of the specifi ed wall thicknesses is listed in tables in the Appendix B (Section -2) and in Appendix C (Section -4).
Typ B
Full pressure factor Increased wall thicknesses on the fi tting body, same resistance to internal pressure as for a pipe with the same diameter, same wall thickness and made of the same grade of steel.
The required calculation methods are based on the calculation standards defi ned in EN 13480-3 (Section -2 in Appendix A, Section -4 in Appendix B). The respective increased wall thickness for some of the specifi ed wall thicknesses is listed in the tables in the Appendix C (Section -2) and in Appendix D (Section -4).
Comparison EN 10253-2/-4 >
7
DIN standards
DIN standards
The basic specifi cations are described in the DIN standards. In some of the sections, additional options are specially labeled for use when agreed upon in the order.
DIN 2605-1, DIN 2615-1, DIN 2616-1
Decreased pressure factor These standards apply to steel fi ttings for butt-welding, whose wall thicknesses are the same as those of the pipes they are welded to; however they only permit a lower internal pressure.
The basis for the calculation is TRD 301.
The respective utilization rate for some of the specifi ed wall thicknesses is defi ned in Tables 1 and 2.
DIN 2605-2, DIN 2615-2, DIN 2616-2, DIN 2617
Full pressure factorThe respective DIN standards apply to steel fi ttings for butt-welding which are able to resist the same internal pressure as the pipe they are welded to.
The basis for the calculation is TRD 301.
The respective increased wall thickness for some of the specifi ed wall thicknesses on the fi tting body is listed in Tables 1 and 2.
DIN 2605, 2609, 2615, 2616, 2617
8
EN standards
EN 10253-2/-4
The manufacturing process and the assigned product forms of the starting material are listed in Section 8.2.1 and Table 1. Special manufacturing processes and starting materials can be ordered with Options 2 and 3 (Section -2) and Options 1 and 2 (Section -4).
EN 10253-2/-4
EN 10253-2 The heat treatment of the individual grades of steel is defi ned in Section 8.2.3 and Table 3. In addition, the recommended temperatures for the heat treatment are listed in the informative Appendix D.
A special heat treatment can be agreed upon with Option 5.
EN 10253-4 The provisions regarding the heat treatment of the fi ttings are made in Section 8.2.3: hot formed fi ttings must be solution annealed after the reforming process. If specifi c conditions are met cold formed fi ttings do not require heat treatment after the reforming process. There are no temperature recommenda-tions for heat treatment.
A heat treatment can be demanded with Option 3.
Manufacturing process of the fi ttings
Heat treatment for fi ttings
9
DIN standards
DIN 2609
The manufacturing process and the assigned product forms of the starting material are listed in the Section 4.1 and Tables 1 and 2. (The required starting material is specifi ed for each material group in Table 2.) Special manufacturing processes and product forms of the starting material can be agreed upon.
DIN 2609
The heat treatment conditions for the individual material groups are specifi ed in Table 3. The details of the heat treatment can be taken from the starting material standards and from the AD 2000 set of rules.
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EN standards
EN 10253-2/-4
The grades of steel and their chemical composition are listed in Tables 4 and 5 (Section -2), and in Tables 3-5 (Section -4) of the EN standards. Other grades of steel can be agreed upon with Option 6 (Section -2).
Grades of steel
Steel name Steel number EN 10253-2 Room P235TR2 1.0255 temperature P265TR2 1.0259
Elevated P235GH 1.0345 temperature P265GH 1.0425 16Mo3 1.5415 10CrMo5-5 1.7338 13CrMo4-5 1.7335 10CrMo9-10 1.7380 X11CrMo5 1.7362 X11CrMo9-1 1.7386 X10CrMoVNb9-1 1.4903
Fine grained P355N 1.0562 steel P355NH 1.0565 P355NL1 1.0566
Grades of steel
11
DIN standards
DIN 2609
DIN 2609 makes reference to specifi c starting materials (Section 4.3 and Table 2) for grades of steel and chemical compositions.•• Other grades of steel can be ordered.
Steel name Steel number Material group
DIN 2609
St 37.4 1.0255St 44.4 1.0257
St 35.8 I + III 1.0305 F + GSt 37.8 I + III 1.0315 F + GSt 45.8 I + III 1.0405 St 42.8 I + III 1.0498 15 Mo 3 1.5415 H 13 CrMo 4 4 1.7335 J 10 CrMo 9 10 1.7380 K
WStE 355 1.0565 RTStE 355 1.0566 S
(cursive: materials are only similar)
12
EN standards
Steel name Steel number EN 10253-2 Low P215NL 1.0451temperatures P265NL 1.0453 12Ni14 1.5637
Combustible L290NB 1.0484 media L360NB 1.0582 L360QB 1.8948 L415NB 1.8972 L415QB 1.8947 L450QB 1.8952
EN 10253-4 (excerpt, not complete) Austenitic X2CrNi18-9 1.4307 X2CrNi19-11 1.4306 X5CrNi18-10 1.4301 X6CrNiTi18-10 1.4541 X6CrNiNb18-10 1.4550 X1CrNi25-21 1.4335 X2CrNiMo17-12-2 1.4404 X5CrNiMo17-12-2 1.4401 X6CrNiMoTi17-12-2 1.4571 X2CrNIMo17-13-3 1.4436 X2CrNiMo18-14-3 1.4435 X1NiCrMoCu25-20-5 1.4539
Austenitic X2CrNiMoN22-5-3 1.4462 Ferritic (duplex)
Grades of steel
13
DIN standards
(cursive: materials are only similar)
Steel name Steel number Material group
DIN 2609
TStE 285 1.0488 T10 Ni 14 1.5637 U
StE 290.7 1.0484 DStE 360.7 1.0582 E
DIN 2609
X 2 CrNi 19 11 1.4306 MX 5 CrNi 18 10 1.4301 LX 6 CrNiTi 18 10 1.4541 N
X 2 CrNiMo 17 13 2 1.4404 PX 5 CrNiMo 17 12 2 1.4401 OX 6 CrNiMoTi 17 12 2 1.4571 Q
14
EN standards
Mechanical properties
Dimensions and tolerances
EN 10253-2/-4
The mechanical properties are given in Tables 6 through 9 (Section -2) and in Tables 6 and 7 (Section -4).
No data on application temperatures for the individual grades of steel.
Tolerances on the weld ends (diameter tolerance):
EN 10253-2/-4
EN 10253-2 ± 1% for the inside diameter or ± 0.5 mm, the larger value always applies, however max. ± 5 mm Preferred dimension: outside diameter [D]minus 2x ordered wall thickness [T] (ID = D – 2T) If the tolerance for the outside diameter applies, then Option 9 must be ordered.
EN 10253-4± 1% for the outside diameter or ± 0.5 mm, the larger value always applies Smaller tolerances can be agreed upon as an option (Option 13).
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DIN standards
DIN standards
± 1% for the outside diameter (but ± 0.5 mm allowed)
DIN 2609
The mechanical properties are not specifi ed in DIN 2609; in Section 4.4. reference is made to the requirements in the starting material standards.Reference values are specifi ed in Table 2 of DIN 2609 for the application temperatures.
OM
V
16
EN standards
Tolerance of the fl ow rate
Tolerance of the wall thicknessesMinus tolerances for the weld ends and fi tting body
Plus wall thicknesses on the weld ends
At least 80% of the theoretical inside diameter (tees 70%)
A special inside diameter for pigging work can be ordered for Section -2 with Option 10.
EN 10253-2D ≤ 610 seamless and welded – 12.5% D > 610 seamless – 12.5% D > 610 welded – 0.35 mm and 0.50 mm depending on the wall thickness
EN 10253-4 D ≤ 610 seamless and welded – 12.5% D > 610 seamless and welded – 0.35 mm and 0.50 mm depending on the wall thickness
All dimensions + 20% (Section -2) + 15% (Section -4)
Tolerances on structural dimensions
The structural dimension tolerances (center-to-end for bends, run length for tees and reducers, height for caps) are specifi ed in Table 19 (Section -2) and Table 10 (Section -4).
17
DIN standards
At least 80% of the theoretical inside diameter (tees 70%)
DIN 2605-1All nominal widths, seamless and welded – 12.5%
DIN 2605-2/2615/2616/2617DN ≤ 600 – 12.5%DN > 600 – 0.35 mm and -0.50 m depending on the wall thickness
All nominal diameters + 15%
The structural dimension tolerances are specifi ed in the corresponding dimension standards (e.g. DIN 2605-1, DIN 2605-2, DIN 2615-1).
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EN standards
EN 10253-2
The preferred dimensions for diameters and wall thicknesses are listed in Table 17. Different dimensions may be agreed upon. The design dimensions for fi ttings are listed in Tables 10 – 16. EN 10253-4
The design dimensions of the fi ttings are listed in the Standards Appendix A. Fittings with other dimensions can be agreed upon. Section -4 does not contain preferred sizes for wall thicknesses.
EN 10253-2
On the weld ends– D ≤ 273.0 mm included in the diameter tolerances– 273.0 < D ≤ 610 mm 2% – D > 610 mm 1% On the fi tting body at pipe bend: 4% EN 10253-4
On the weld ends– D ≤ 406.4 mm included in the diameter tolerances– D > 406.4 mm and D/T ≤ 100 2%– The values must be agreed upon for fi ttings with D/T-ratio > 100
On the fi tting body of elbows: 4%
Dimensions
Out of roundness tolerance
Tolerances on the form of fi ttings
Dimension X ≤ 1% from the diameter, min. 1.0 mm
19
DIN standards
DIN standards
The diameters, wall thicknesses, and the design dimensions are listed in Tables 1 and 2 of the dimension standards (e.g. DIN 2605-1, DIN 2605-2). Different wall thicknesses can also be ordered according to the dimension standard specifi cations.
DIN 2609
On the weld ends– da ≤ 200 mm is within the permissible diameter tolerance– da > 200 mm 2%For elbows over the entire length: 4%
Dimension Q ≤ 1% from the diameter, however 1.0 mm is allowed
20
EN standards
Weld end types
Inspection requirements
EN 10253-2/-4
Cast analysis for each cast (Sections –2 and -4)
Tensile test at room temperatureSection -2: D ≥ 114.3 mm 1 tensile test of each test unit. (Under certain conditions the tensile test of the starting material can be specifi ed for non alloyed steels.) This procedure can also be excluded as an option – Option 14.Section -4: D > 100 mm 1 tensile test of each test unit
EN 10253-2
Wall thicknesses ≤ 3 mm – square cut or slightly chamfered > 3 mm to ≤ 22 mm - bevel 30° , root face 1.6 ± 0.8 mm> 22 mm – type of bevel shall be agreed Option 12: the end types can be defi ned when the order is placed.
The wall thickness on the weld ends can be machined by chamfering at the following angles: – outer: 30°, – inner: 18°
EN 10253-4
Standard design: the fi ttings are to be delivered with square cut ends. For fi ttings with wall thicknesses ≥ 3.2 mm, a 30° bevel and a 1.6 ± 0.8 mm root face can be specifi ed with Option 14. For wall thicknesses > 20 mm a alternative bevel can be specifi ed.
- 0°+ 5°
- 0°+ 5°
21
DIN standards
DIN standards
Wall thicknesses ≤ 3 mm – square cut > 3 mm bis ≤ 16 mm – bevel according to DIN 2559-1 Identifying number 22> 16 mm bevel according to DIN 2559-1 Identifying number 3•• Other types of bevels can be agreed upon
The wall thickness on the weld ends can be bevelled by machining the inner edge and/or the outer edge:– outer: 27 to 30°, – inner: 15 to 18°
DIN 2609
Cast analysis for each cast
2 tensile tests for da ≥ 100 mm for each test unit,for < 10 fi ttings per test unit, 1 tensile test. A maximum of 4 test units of each delivered quantity is tested.
22
EN standards
Inspection requirements
EN 10253-2/-4
Hardness test Section -2: D < 114.3 mm: on 10 fi ttings of each test unit lotSection -4: D ≤ 100 mm: on 10% of each test unit, at least on 3 parts, in addition the results of the mechanical testing of the starting material must be entered in the inspection certifi cate. A ring fl aring test can be conducted for cold-formed fi ttings with D ≤ 100 mm without subsequent heat treatment.
Impact test Section -2: when D ≥ 114.3 mm and ≥ 5 mm wall thickness 1 impact test for each test unit, only certain grades of steel The impact test is not mandatory for the steel grades P235GH, P265GH, 16Mo3, 10CrMo5-5, 13CrMo4-5, 10CrMo0-10, X11CrMo5, and X11CrMo9-1.
The impact test can be agreed upon for this type of steel with Option 16.
Section -4: impact test only as an option (Option 5 and 6)
Test for material identifi cation (positive material identifi cation) for alloyed steels on each fi tting. Dimension at testing at frequency fi xed by the manufacturer. Visual inspection of each fi tting.
Section -2: Non-destructive testing on cold-formed tees.
23
DIN standards
DIN 2609
For da < 100 mm hardness test on 10% of each test unit with a minimum of 3 fi ttings tested.
2 impact tests for da ≥ 100 mm and ≥ 5 mm wall thickness for each test unit, only for steel types for which minimum values are specifi ed in the starting material standards.
For < 10 fi ttings 1 impact test per test unit. A maximum of 4 test units of each delivered quantity is tested.
Positive material identifi cation for alloyed steels on each fi tting.
Dimensional check on each fi tting.
Visual inspection of each fi tting.
No test required.
24
EN standards
Inspection requirements
EN 10253-2/-4
Additional tests can be agreed upon as an option:– Product analysis: Section -2 – Option 7, Section -4 – Option 4– Tensile test at elevated temperature: Section -2 – Option 8, Section -4 – Option 7– Hardness test on each fi tting (Option 15 – Section 2) – Ultrasonic test of the starting material for laminar imperfections: Section -2 – Option 24, Section -4 – Option 21– Impact test: Section -2 – Option 16, Section -4 – Option 5 und 8– Test for intergranular corrosion: Section -4 – Option 9– Liquid penetrant test of surface Section -4 – Option 20 Additional tests are required for welded fi ttings if welding is part of the manufacturing process.
Test unit sizes
EN 10253-2/-4
Defi nition of test unitFittings of the same type, the same specifi ed dimensions, the same manufacturing process (for welded fi ttings: the same wel-ding process), the same cast and with the same heat treatment. Several heat treatment lots can be combined into one inspection lot under predefi ned conditions.
Test unit size EN 10253-2 Same as defi ned under test unit, however, up to 20 special test unit sizes can be agreed upon with Option 18.EN 10253-4The test unit size is specifi ed in Table 11; however, other test unit lot sizes can be agreed upon with Option 16.
25
DIN standards
25
DIN 2609
Additional agreements:•• Product analysis•• Tensile test at elevated temperature•• Test for intergranular corrosion•• Non-destructive test
Additional tests are required if the manufacturing process of the fi tting includes welding.
DIN standards
Defi nition of a test unitFittings of the same dimension or material with da > 100 mm made of alloyed steel and from the same cast.
The test unit is limited to a heat treatment for materials that undergo fi nal heat treatment; however, under certain conditions several heat treatment lots can be combined into one inspection lot if the fi ttings are from the same cast and made of unalloyed steel.
Test unit size The test unit sizes are listed in Sections 5.3.2 – 5.3.4 of DIN 2609.
26
EN standards
Marking
EN 10253-2
Each fi tting must be permanently marked.
EN 10253-2 Section 15Marking through hard stamping.
– Manufacturer‘s mark or logo– Country of manufacture (ISO-Code) – "EN2" as reference to this standard – "B" for fi ttings of type B– Steel name or steel number – "W" (for welded fi ttings or fi ttings that are manufactured from welded pipes)– Cast number or code number – Mark of the inspection representative – Outside diameter D*– Wall thickness T*
*) only for fi ttings D ≥ 88.9 mm D1 and T1 must also be marked for reducing tees and reducers. For fi ttings < 88.9 mm the packaging is marked or a label tape is used to identify the goods.
A special identifi cation mark can be agreed upon with Options 25 or 26.
27
DIN standards
DIN 2609
Each fi tting must be permanently marked with an imprint. (The imprint can be replaced with another type of permanent inscription for the material groups L – Q.)
– Manufacturer‘s mark– Code letter of the material group and Material symbol* or material no.* of the starting material*– Abbreviation "S" or IIW" for seamless type or welded– Association mark DIN*– Section number of the corresponding DIN-dimension standard (only for Section 2)– Cast number or abbreviation– Inspector‘s mark
*) only for fi ttings > DN 50
28
EN standards
Marking
Preparation for shipment, handling, and packaging
EN 10253-4
EN 10253-4 Section 15
– Manufacturer‘s mark or logo– Country of manufacture (ISO-Code)– EN 10253-4, Type "A" or "B"– Steel name or steel number– Cast number or code number– Abbreviation "S" or IIW" for seamless type or welded– Outside diameter D**– Wall thickness T**– Mark of the inspection representative
**) D1 and T1 must also be marked for reducing tees and reducers.
Marking can be carried out with the inkjet recording method, through electrochemical etching, and through fi bre or laser marking. A special marking can be agreed upon with Option 22.
EN 10253-2/-4
EN 10253-2Fittings are delivered with or without surface protection at the discretion of the manufacturer. For D ≤ 60.3 the fi ttings are delivered in the packaging. Surface protection can be agreed upon with Option 27.
EN 10253-4Fittings are delivered by the manufacturer in normal packaging, without surface protection, and without end protectors (caps). Special packaging, protective coverings, and end protectors (caps) can be agreed upon with Option 23.
29
DIN standards
DIN 2609
DIN standards
No specifi cations in the DIN standards
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