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(en)
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EN (European Standards)
vs. DIN (National Standards)
Fittings for butt-welding
3–5
Comparison EN 10253-2/-4 with
DIN 2605, 2609, 2615, 2616, 2617
6 – 29
Type of fitting
6–7
Manufacturing process of the fittings
8–9
Heat treatment for fittings
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 fittings is
an exclusive service of the ERNE FITTINGS GmbH, published for TUBE
in April 2010.
Information Service
The European standards (EN standards) for buttwelding fittings have been published at random
intervals up until 2009 and replace the corresponding 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The corresponding national standards were withdrawn after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.
2
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 specific
inspection requirments.
EN 10253-2
Non alloy and ferritic alloy steel with specific inspection
requirements.
EN 10253-3
Wrought austenitic and austenitic-ferritic (duplex) stainless
steels without specific inspection requirements.
EN 10253-4
Wrought austenitic and austenitic-ferritic (duplex) stainless
steels with specific inspection requirements.
Sections 1 and 3 (EN 10253-1, EN 10253-3) describe fittings
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.
3
EN 10253-2
Fittings for butt-welding; non alloy and ferritic alloy steel
with specific inspection requirements.
(designated as Section -2 in this brochure)
EN 10253-4
Fittings for butt-welding; austenitic and austenitic-ferritic
(duplex) stainless steels without specific inspection requirements.
(designated as Section -4 in this brochure)
Seamless and welded fittings 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 fittings are
considered to be materials whereas welded fittings, including
those that are made from welded pipes, are considered to be
components. Details are listed in the informative Appendix ZA
of the standards.
4
These standards define:
–
–
–
–
–
–
The type of fitting
The type of steel
The mechanical properties
The dimensions and tolerances
The test requirements
The test certificates (inspection certificate 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 fittings is
implied under protective measures)
The fitting are designated as follows:
– Specification of the EN-Standard (EN 10253-2/-4)
and specification of the type (A or B)
– Material abbreviation or material number
– Type of fitting (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 fittings and the steel material is the
responsibility of the user.
5
EN standards
Comparison
EN 10253-2/-4
>
EN 10253-2/-4
The EN standards describe the basic specifications which can
be supplemented with additional options upon request and
placement of orders.
Type of fitting
Typ A
Decreased pressure factor
Same wall thickness on the weld ends and on the fitting body as
for a pipe with the same specified wall thickness. Their resistance
to internal pressure is less than that of 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 defined in EN 13480-3 (Section -2 in Appendix A,
Section -4 in Appendix B). The respective utilization rate for some
of the specified 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 fitting 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 defined in EN 13480-3 (Section -2 in Appendix A,
Section -4 in Appendix B). The respective increased wall thickness
for some of the specified wall thicknesses is listed in the tables in
the Appendix C (Section -2) and in Appendix D (Section -4).
6
DIN standards
DIN 2605, 2609, 2615, 2616, 2617
DIN standards
The basic specifications 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 fittings 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 specified
wall thicknesses is defined in Tables 1 and 2.
DIN 2605-2, DIN 2615-2, DIN 2616-2, DIN 2617
Full pressure factor
The respective DIN standards apply to steel fittings for buttwelding 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
specified wall thicknesses on the fitting body is listed in
Tables 1 and 2.
7
EN standards
Manufacturing process of the fittings
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).
Heat treatment for fittings
EN 10253-2/-4
EN 10253-2
The heat treatment of the individual grades of steel is defined
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 fittings are
made in Section 8.2.3: hot formed fittings must be solution
annealed after the reforming process. If specific conditions are
met cold formed fittings do not require heat treatment after
the reforming process. There are no temperature recommendations for heat treatment.
A heat treatment can be demanded with Option 3.
8
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 specified 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 specified 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.
9
EN standards
Grades of steel
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
Room
temperature
P235TR2
P265TR2
1.0255
1.0259
Elevated
temperature
P235GH
1.0345
P265GH
1.0425
16Mo3
10CrMo5-5
13CrMo4-5
10CrMo9-10
X11CrMo5
X11CrMo9-1
X10CrMoVNb9-1
1.5415
1.7338
1.7335
1.7380
1.7362
1.7386
1.4903
P355N
P355NH
P355NL1
1.0562
1.0565
1.0566
EN 10253-2
Fine grained
steel
10
DIN standards
DIN 2609
DIN 2609 makes reference to specific 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
St 44.4
1.0255
1.0257
St 35.8 I + III
St 37.8 I + III
St 45.8 I + III
St 42.8 I + III
15 Mo 3
1.0305
1.0315
1.0405
1.0498
1.5415
H
13 CrMo 4 4
10 CrMo 9 10
1.7335
1.7380
J
K
WStE 355
TStE 355
1.0565
1.0566
R
S
F+G
F+G
(cursive: materials are only similar)
11
EN standards
Grades of steel
Steel name
Steel number
Low
temperatures
P215NL
P265NL
12Ni14
1.0451
1.0453
1.5637
Combustible
media
L290NB
L360NB
L360QB
L415NB
L415QB
L450QB
1.0484
1.0582
1.8948
1.8972
1.8947
1.8952
EN 10253-2
EN 10253-4 (excerpt, not complete)
Austenitic
X2CrNi18-9
X2CrNi19-11
X5CrNi18-10
X6CrNiTi18-10
X6CrNiNb18-10
X1CrNi25-21
X2CrNiMo17-12-2
X5CrNiMo17-12-2
X6CrNiMoTi17-12-2
X2CrNIMo17-13-3
X2CrNiMo18-14-3
X1NiCrMoCu25-20-5
1.4307
1.4306
1.4301
1.4541
1.4550
1.4335
1.4404
1.4401
1.4571
1.4436
1.4435
1.4539
Austenitic
Ferritic (duplex)
X2CrNiMoN22-5-3
1.4462
12
DIN standards
Steel name
Steel number
Material group
TStE 285
10 Ni 14
1.0488
1.5637
T
U
StE 290.7
StE 360.7
1.0484
1.0582
D
E
X 2 CrNi 19 11
X 5 CrNi 18 10
X 6 CrNiTi 18 10
1.4306
1.4301
1.4541
M
L
N
X 2 CrNiMo 17 13 2
X 5 CrNiMo 17 12 2
X 6 CrNiMoTi 17 12 2
1.4404
1.4401
1.4571
P
O
Q
DIN 2609
DIN 2609
(cursive: materials are only similar)
13
EN standards
Mechanical properties
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.
Dimensions and tolerances
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).
14
OMV
DIN standards
DIN 2609
The mechanical properties are not specified in DIN 2609;
in Section 4.4. reference is made to the requirements in the
starting material standards.
Reference values are specified in Table 2 of DIN 2609 for
the application temperatures.
DIN standards
± 1% for the outside diameter
(but ± 0.5 mm allowed)
15
EN standards
Tolerance of the flow rate
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.
Tolerance of the wall thicknesses
Minus tolerances for the weld ends and fitting body
EN 10253-2
D ≤ 610 seamless and welded
D > 610 seamless
D > 610 welded
EN 10253-4
D ≤ 610 seamless and welded
D > 610 seamless and welded
– 12.5%
– 12.5%
– 0.35 mm and 0.50 mm
depending on the wall
thickness
– 12.5%
– 0.35 mm and 0.50 mm
depending on the wall
thickness
Plus wall thicknesses on the weld ends
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 specified
in Table 19 (Section -2) and Table 10 (Section -4).
16
DIN standards
At least 80% of the theoretical inside diameter (tees 70%)
DIN 2605-1
All nominal widths,
seamless and welded
DIN 2605-2/2615/2616/2617
DN ≤ 600
DN > 600
All nominal diameters
– 12.5%
– 12.5%
– 0.35 mm and -0.50 m
depending on the wall
thickness
+ 15%
The structural dimension tolerances are specified in the
corresponding dimension standards (e.g. DIN 2605-1,
DIN 2605-2, DIN 2615-1).
17
EN standards
Tolerances on the form of fittings
Dimension X ≤ 1% from the diameter, min. 1.0 mm
Out of roundness tolerance
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 fitting 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 fittings with D/T-ratio > 100
On the fitting body of elbows:
4%
Dimensions
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 fittings are listed in Tables 10 – 16.
EN 10253-4
The design dimensions of the fittings 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.
18
DIN standards
Dimension Q ≤ 1% from the diameter, however 1.0 mm is allowed
DIN 2609
On the weld ends
– da ≤ 200 mm is within the permissible diameter tolerance
2%
– da > 200 mm
For elbows over the entire length:
4%
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 specifications.
19
EN standards
Weld end types
EN 10253-2
Wall thicknesses
≤ 3 mm –
square cut or slightly chamfered
+ 5°
> 3 mm to ≤ 22 mm - bevel 30° - 0°, root face 1.6 ± 0.8 mm
> 22 mm –
type of bevel shall be agreed
Option 12: the end types can be defined 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 fittings are to be delivered with square
+ 5°
cut ends. For fittings with wall thicknesses ≥ 3.2 mm, a 30° - 0°
bevel and a 1.6 ± 0.8 mm root face can be specified with
Option 14. For wall thicknesses > 20 mm a alternative bevel
can be specified.
Inspection requirements
EN 10253-2/-4
Cast analysis for each cast (Sections –2 and -4)
Tensile test at room temperature
Section -2: D ≥ 114.3 mm 1 tensile test of each test
unit. (Under certain conditions the tensile test of
the starting material can be specified 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
20
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 fittings per test unit, 1 tensile test. A maximum
of 4 test units of each delivered quantity is tested.
21
EN standards
Inspection requirements
EN 10253-2/-4
Hardness test
Section -2: D < 114.3 mm: on 10 fittings of each test unit lot
Section -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 certificate. A ring flaring test can
be conducted for cold-formed fittings 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 identification (positive material identification)
for alloyed steels on each fitting.
Dimension at testing at frequency fixed by the manufacturer.
Visual inspection of each fitting.
Section -2: Non-destructive testing on cold-formed tees.
22
DIN standards
DIN 2609
For da < 100 mm hardness test on 10% of each test unit
with a minimum of 3 fittings 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 specified in the starting material standards.
For < 10 fittings 1 impact test per test unit. A maximum
of 4 test units of each delivered quantity is tested.
Positive material identification for alloyed steels
on each fitting.
Dimensional check on each fitting.
Visual inspection of each fitting.
No test required.
23
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 fitting (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 fittings if welding
is part of the manufacturing process.
Test unit sizes
EN 10253-2/-4
Definition of test unit
Fittings of the same type, the same specified dimensions, the
same manufacturing process (for welded fittings: the same welding process), the same cast and with the same heat treatment.
Several heat treatment lots can be combined into one inspection
lot under predefined conditions.
Test unit size
EN 10253-2
Same as defined under test unit, however, up to 20 special
test unit sizes can be agreed upon with Option 18.
EN 10253-4
The test unit size is specified in Table 11; however, other test unit
lot sizes can be agreed upon with Option 16.
24
DIN standards
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 fitting includes welding.
DIN standards
Definition of a test unit
Fittings 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 final heat treatment; however, under certain
conditions several heat treatment lots can be combined into
one inspection lot if the fittings 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.
25
EN standards
Marking
EN 10253-2
Each fitting must be permanently marked.
EN 10253-2 Section 15
Marking through hard stamping.
–
–
–
–
–
–
–
–
–
–
Manufacturer‘s mark or logo
Country of manufacture (ISO-Code)
"EN2" as reference to this standard
"B" for fittings of type B
Steel name or steel number
"W" (for welded fittings or fittings that are manufactured
from welded pipes)
Cast number or code number
Mark of the inspection representative
Outside diameter D*
Wall thickness T*
*) only for fittings D ≥ 88.9 mm
D1 and T1 must also be marked for reducing tees and
reducers. For fittings < 88.9 mm the packaging is marked or
a label tape is used to identify the goods.
A special identification mark can be agreed upon with Options
25 or 26.
26
DIN standards
DIN 2609
Each fitting 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 fittings > DN 50
27
EN standards
Marking
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 fibre or laser marking. A special
marking can be agreed upon with Option 22.
Preparation for shipment, handling, and packaging
EN 10253-2/-4
EN 10253-2
Fittings are delivered with or without surface protection at the
discretion of the manufacturer. For D ≤ 60.3 the fittings are
delivered in the packaging. Surface protection can be agreed
upon with Option 27.
EN 10253-4
Fittings 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.
28
DIN standards
DIN 2609
DIN standards
No specifications in the DIN standards
29
ERNE Standardfolder en | 4-2010
erne fittings gmbh
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T +43 5524 501-0, F +43 5524 501-930
office@ernefittings.com
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