customer information - Dillinger Hütte GTS
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customer information - Dillinger Hütte GTS
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CUSTOMER INFORMATION<br />
COMMENTS RELATING TO CHANGES IN EN 10028 PARTS 1-6, EDITION 2003<br />
FLAT STEEL PRODUCTS FOR PRESSURE PURPOSES<br />
Revision 0, May 2005, 7 pages<br />
Key words: EN 10028<br />
The following comments have been prepared by a German technical working group of the<br />
“Walzstahlvereinigung” with contribution of <strong>Dillinger</strong> <strong>Hütte</strong> <strong>GTS</strong>. Based on the new edition<br />
of EN 10028 (June 2003) they have been prepared to help in the implementation of this new<br />
standard. The comments are intended for our <strong>customer</strong>s in the fabrication and distribution<br />
sector.<br />
Because of safety purposes, pressure vessel steels represent an important and technically<br />
sophisticated application field for flat products, especially for heavy plates.<br />
The last edition of EN 10028 has already summarized, for the first time, all current relevant<br />
steel grades in one standard – independent of the production process. On this basis, the new<br />
edition represents an actualisation and takes into account the requirements for a harmonized<br />
European standard. This forms the basis for using such steels under the conditions of the<br />
European Pressure Equipment Directive. About this we refer to our corresponding <strong>customer</strong><br />
<strong>information</strong>.<br />
You will find the main changes, compared to the preceding EN 10028, in the enclosed annex<br />
or on www.heavyplate.com.<br />
For further <strong>information</strong>, we are entirely at your disposal.<br />
Revision 0<br />
Dillingen, May 2005<br />
Marketing Constructional Steelwork<br />
mkt-stahlbau@dillinger.biz
Changes in the EN standards for flat steel products for pressure purposes<br />
New edition: June 2003<br />
As before the revised EN 10028 is only valid for flat products. It covers all steel grades for the<br />
production of pressure equipment, including stainless steels in part 7. Part 7 is not further<br />
mentioned in this context.<br />
preceding EN standard new EN standard<br />
EN 10028-2:1992 EN 10028-2:2003-06<br />
EN 10028-3:1992 EN 10028-3:2003-06<br />
EN 10028-4:1994 EN 10028-4:2003-06<br />
EN 10028-5:1996 EN 10028-5:2003-06<br />
EN 10028-6:1996 EN 10028-6:2003-06<br />
General delivery conditions for all parts<br />
of the standard:<br />
EN 10028-1:1992 ⇒ EN 10028-1:2000 EN 10028-1:2000-04+A1:2002-11<br />
Constituent element of all parts of the new EN 10028 is annex ZA, which takes into account different<br />
safety regulations set up by the European Commission in the Pressure Equipment Directive<br />
97/23/EC (PED).<br />
Since 29 May 2002 all requirements of PED have to be respected for the manufacturing of new<br />
pressure equipment (pressure vessels, boilers, pipes, fittings) for utilisation in the EU.<br />
As one of requirements is the minimum toughness value of 27 J for Ch-V specimen in the transverse<br />
direction, in all parts of EN 10028 former lower values in transverse direction are increased to this<br />
minimum of 27 J.<br />
By annex ZA EN 10028 becomes a Harmonized European Standard.<br />
Note 1: Contrary to the CPD, according to which all construction products covered by the new<br />
EN 10025 have to be delivered with CE marking, flat products according to PED are not to be<br />
delivered with CE marking, but only the pressure equipment itself as a final product.<br />
This way, the fabricator of the final product assures the conformity with the PED.<br />
Provided that the manufacturer of flat products according to EN 10028 applies a Quality Management<br />
System certified in accordance with the requirements of PED, the flat products can be delivered<br />
with a mill inspection certificate.<br />
Note 2: EN 10207:1991 + A1:1997 “Technical delivery conditions for plate, strips and bars for simple<br />
pressure vessels” remains unchanged for the time being. This standard is in conformity with the<br />
European Regulation 87/404 for simple pressure vessels. This standard is not further mentioned here.<br />
Note 3: As in all new EN standards the unit N/mm² is replaced by MPa now. This means:<br />
1 MPa = 1 N/mm²<br />
Note 4: The following comments are covering the basic requirements of the standard and not all<br />
possible options.<br />
A1
EN 10028-1:2000-04 + A1:2002-11<br />
Flat steel products for pressure purposes<br />
Part 1: General requirements<br />
Main changes compared to the preceding edition:<br />
The 2000 version of part 1 of EN 10028 was already a revision of the original EN 10028-1:1992,<br />
which was issued at the time together with part 2 for unalloyed and alloyed steels with specified<br />
elevated temperature properties and part 3 for fine grain steels.<br />
In 1994 the new part 4 of EN 10028 for nickel–alloy steels with specified low temperature properties<br />
and<br />
in 1996 part 5 and part 6 of EN 10028 for thermomechanically rolled and quenched and tempered fine<br />
grain steels for pressure equipment production were published.<br />
In 2000 part 7 of EN 10028 for stainless steels was published.<br />
With the 2000 issue of part 1 all new parts mentioned above were taken into consideration.<br />
The current amendment A1:2002 for EN 10028-1:2000 contains certain supplements and corrections<br />
in particular concerning the position of test pieces (especially the flat and round specimen for tensile<br />
tests of TM and Q + T fine grain steel grades).<br />
A2
EN 10028-2:2003-06<br />
Flat steel products for pressure purposes<br />
Part 2: Non-alloy and alloy steels with specified elevated temperature<br />
properties<br />
Main changes compared to the preceding edition:<br />
1. For all unalloyed steel grades the range of application is brought in line with the current demand<br />
by lowering the testing temperature for the impact test on transverse Charpy-V test pieces<br />
from 0 to –20 °C.<br />
2. The maximum allowable P and S contents are generally reduced.<br />
3. As the PED prescribes the required proof strength values at elevated temperatures to be<br />
established by statistical methods, a new standard EN 10314 with a corresponding procedure for<br />
the “derivation of minimum proof strength values for steel at elevated temperatures” was<br />
established in 2002. According to this procedure all 0.2 % proof strength values for all steel grades<br />
of part 2 (and also part 3) have been calculated and redetermined .<br />
(Exceptions where the determinations have not been established according to EN 10314 are<br />
explicitly marked in the standard).<br />
4. The steel grade 12CrMo9-10 replaces the former 11CrMo9-10.<br />
5. Eight new alloy steel grades have been included in the standard:<br />
new basis / corresponding steel grade max. thickness<br />
18MnMo4-5 French grade 18MD4-05<br />
ASTM grade A302 Grade B<br />
250 mm<br />
20MnMoNi4-5 German VdTÜV grade<br />
ASTM grade A533 Grade B<br />
250 mm<br />
15NiCuMoNb5-6-4 German VdTÜV grade 15NiCuMoNb5 200 mm<br />
13CrMoSi5-5 ASTM grade A387 Grade 11 250 mm<br />
X12CrMo5 ASTM grade A387 Grade 5<br />
German VdTÜV grade 12CrMo19-5<br />
250 mm<br />
13CrMoV9-10 ASTM gradeA542 type D 250 mm<br />
12CrMoV12-10 ASTM grade A542 type E 250 mm<br />
X10CrMoVNb9-1 ASTM grade A387 Grade 91 250 mm<br />
6. For all steel grades that have been continued from the preceding standard the maximum plate<br />
thickness is increased from 150 mm to 250 mm.<br />
7. More precise hints for the further processing of steel grades according to this standard are given.<br />
In particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is<br />
defined, expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is<br />
recommended to consult the steel producer.<br />
8. For unalloyed steels there are recommendations for the inspection criteria to be used when a HIC<br />
test (Hydrogen Induced Cracking) according to EN 10229 is ordered.<br />
9. For CrMo steels recommended conditions for the Step-Cooling-Test (time-temperature<br />
treatment) are introduced to check their tendency for embrittlement during the later operation of<br />
the vessel.<br />
A3
EN 10028-3:2003-06<br />
Flat steel products for pressure purposes<br />
Part 3: Weldable fine grain steels, normalized<br />
Main changes compared to the preceding edition:<br />
1. For the quality ranges N, NH and NL1 the range of application is aligned to PED and to the<br />
current demand by changing the impact test requirements as follows:<br />
quality former CH-V transverse values new values<br />
N *) 27 J at 0°C 20 J at -20°C 30 J at -20°C<br />
NH 27 J at 0°C 20 J at -20°C 30 J at -20°C<br />
NL1 27 J at -20°C 20 J at -40°C 27 J at -40°C<br />
NL2 27 J at -50°C 27 J at -50°C<br />
*) In the new edition the N quality only remains for P355.<br />
2. The maximum allowable P and S contents are generally reduced.<br />
3. As the PED prescribes the required proof strength values at elevated temperatures to be<br />
established by statistical methods, a new standard EN 10314 with a corresponding procedure for<br />
the “derivation of minimum proof strength values for steel at elevated temperatures” was<br />
established in 2002. According to this procedure all 0.2 % proof strength values for all steel grades<br />
of part 3 (and also part 2) have been calculated and redetermined .<br />
4. The maximum plate thickness has been increased from 150 mm to 250 mm for all grades. For<br />
P460, however, the tensile test values above 100 mm have to be agreed prior to the order.<br />
5. More precise hints for the further processing of steel grades according to this standard are given.<br />
In particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is<br />
defined, expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is<br />
recommended to consult the steel producer.<br />
6. For unalloyed steels there are recommendations for the inspection criteria to be used when a HIC<br />
test (Hydrogen Induced Cracking) according to EN 10229 is ordered.<br />
A4
EN 10028-4:2003-06<br />
Flat steel products for pressure purposes<br />
Part 4: Nickel-alloy steels with specified low temperature properties<br />
Main changes compared to the preceding edition:<br />
1. The manufacturing of the steel grades 11MnNi5-3 and 13MnNi6-3 by normalizing rolling<br />
instead of normalizing in furnace is no longer permitted.<br />
2. The maximum permissible deviation of the product analysis from the heat analysis concerning<br />
S contents is generally reduced. In case of the steel grade X7Ni9 this also applies to the P value.<br />
3. The designation of the 5%Ni-steel grade 12Ni19 has been changed to X12Ni5.<br />
4. The 9%Ni - steel grade X8Ni9 can be delivered (like before) with a minimum tensile strength of<br />
640 MPa or 680 MPa respectively.<br />
In the former standard the two minimum tensile strength versions “HT640” and “HT680” were also<br />
differing in the minimum impact values of 27 J or 50 J respectively at – 196 °C for Charpy-V<br />
transverse test pieces. As the heat treatment was not clearly defined for the HT640 grade there was<br />
the danger of mixing up the two versions.<br />
In the new edition the minimum impact value is increased from 27 J to 40 J for“640”and the<br />
delivery condition is integrated into the designation of the steel grade. There are now the following<br />
clearly determined possibilities (X7Ni9 is shown to complete the picture):<br />
grade delivery condition Rm (min.) Ch-V transverse at<br />
– 196 ° C (min.)<br />
X8Ni9 + NT640 +N plus +NT 640 MPa 40 J<br />
X8Ni9 + QT640 +QT 640 MPa 40 J<br />
X8Ni9 + QT680 +QT 680 MPa 50 J<br />
X7Ni9 +QT 680 MPa 80 J<br />
5. The maximum plate thickness for the steel grades up to 3.5 % Ni (11MnNi5-3, 13MnNi6-3,<br />
15NiMn6 and 12 Ni14) is increased from 50 mm to 80 mm.<br />
A5
EN 10028-5:2003-06<br />
Flat steel products for pressure purposes<br />
Part 5: Weldable fine grain steels, thermomechanically rolled<br />
Main changes compared to the preceding edition:<br />
More precise hints for the further processing of steel grades according to this standard are given. In<br />
particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is defined,<br />
expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is recommended to<br />
consult the steel producer.<br />
EN 10028-6:2003-06<br />
Flat steel products for pressure purposes<br />
Part 6: Weldable fine grain steels, quenched and tempered<br />
Main changes compared to the preceding edition:<br />
The recommendations for the processing of the steel have been updated regarding the references.<br />
Moreover the requirements for the impact test are now valid up to a thickness of 150 mm without<br />
special agreements.<br />
A6