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COMMENTS RELATING TO CHANGES IN EN 10028 PARTS 1-6, EDITION 2003

FLAT STEEL PRODUCTS FOR PRESSURE PURPOSES

Revision 0, May 2005, 7 pages

Key words: EN 10028

The following comments have been prepared by a German technical working group of the

“Walzstahlvereinigung” with contribution of Dillinger Hütte GTS. Based on the new edition

of EN 10028 (June 2003) they have been prepared to help in the implementation of this new

standard. The comments are intended for our customers in the fabrication and distribution

sector.

Because of safety purposes, pressure vessel steels represent an important and technically

sophisticated application field for flat products, especially for heavy plates.

The last edition of EN 10028 has already summarized, for the first time, all current relevant

steel grades in one standard – independent of the production process. On this basis, the new

edition represents an actualisation and takes into account the requirements for a harmonized

European standard. This forms the basis for using such steels under the conditions of the

European Pressure Equipment Directive. About this we refer to our corresponding customer

information.

You will find the main changes, compared to the preceding EN 10028, in the enclosed annex

or on www.heavyplate.com.

For further information, we are entirely at your disposal.

Revision 0

Dillingen, May 2005

Marketing Constructional Steelwork

mkt-stahlbau@dillinger.biz


Changes in the EN standards for flat steel products for pressure purposes

New edition: June 2003

As before the revised EN 10028 is only valid for flat products. It covers all steel grades for the

production of pressure equipment, including stainless steels in part 7. Part 7 is not further

mentioned in this context.

preceding EN standard new EN standard

EN 10028-2:1992 EN 10028-2:2003-06

EN 10028-3:1992 EN 10028-3:2003-06

EN 10028-4:1994 EN 10028-4:2003-06

EN 10028-5:1996 EN 10028-5:2003-06

EN 10028-6:1996 EN 10028-6:2003-06

General delivery conditions for all parts

of the standard:

EN 10028-1:1992 ⇒ EN 10028-1:2000 EN 10028-1:2000-04+A1:2002-11

Constituent element of all parts of the new EN 10028 is annex ZA, which takes into account different

safety regulations set up by the European Commission in the Pressure Equipment Directive

97/23/EC (PED).

Since 29 May 2002 all requirements of PED have to be respected for the manufacturing of new

pressure equipment (pressure vessels, boilers, pipes, fittings) for utilisation in the EU.

As one of requirements is the minimum toughness value of 27 J for Ch-V specimen in the transverse

direction, in all parts of EN 10028 former lower values in transverse direction are increased to this

minimum of 27 J.

By annex ZA EN 10028 becomes a Harmonized European Standard.

Note 1: Contrary to the CPD, according to which all construction products covered by the new

EN 10025 have to be delivered with CE marking, flat products according to PED are not to be

delivered with CE marking, but only the pressure equipment itself as a final product.

This way, the fabricator of the final product assures the conformity with the PED.

Provided that the manufacturer of flat products according to EN 10028 applies a Quality Management

System certified in accordance with the requirements of PED, the flat products can be delivered

with a mill inspection certificate.

Note 2: EN 10207:1991 + A1:1997 “Technical delivery conditions for plate, strips and bars for simple

pressure vessels” remains unchanged for the time being. This standard is in conformity with the

European Regulation 87/404 for simple pressure vessels. This standard is not further mentioned here.

Note 3: As in all new EN standards the unit N/mm² is replaced by MPa now. This means:

1 MPa = 1 N/mm²

Note 4: The following comments are covering the basic requirements of the standard and not all

possible options.

A1


EN 10028-1:2000-04 + A1:2002-11

Flat steel products for pressure purposes

Part 1: General requirements

Main changes compared to the preceding edition:

The 2000 version of part 1 of EN 10028 was already a revision of the original EN 10028-1:1992,

which was issued at the time together with part 2 for unalloyed and alloyed steels with specified

elevated temperature properties and part 3 for fine grain steels.

In 1994 the new part 4 of EN 10028 for nickel–alloy steels with specified low temperature properties

and

in 1996 part 5 and part 6 of EN 10028 for thermomechanically rolled and quenched and tempered fine

grain steels for pressure equipment production were published.

In 2000 part 7 of EN 10028 for stainless steels was published.

With the 2000 issue of part 1 all new parts mentioned above were taken into consideration.

The current amendment A1:2002 for EN 10028-1:2000 contains certain supplements and corrections

in particular concerning the position of test pieces (especially the flat and round specimen for tensile

tests of TM and Q + T fine grain steel grades).

A2


EN 10028-2:2003-06

Flat steel products for pressure purposes

Part 2: Non-alloy and alloy steels with specified elevated temperature

properties

Main changes compared to the preceding edition:

1. For all unalloyed steel grades the range of application is brought in line with the current demand

by lowering the testing temperature for the impact test on transverse Charpy-V test pieces

from 0 to –20 °C.

2. The maximum allowable P and S contents are generally reduced.

3. As the PED prescribes the required proof strength values at elevated temperatures to be

established by statistical methods, a new standard EN 10314 with a corresponding procedure for

the “derivation of minimum proof strength values for steel at elevated temperatures” was

established in 2002. According to this procedure all 0.2 % proof strength values for all steel grades

of part 2 (and also part 3) have been calculated and redetermined .

(Exceptions where the determinations have not been established according to EN 10314 are

explicitly marked in the standard).

4. The steel grade 12CrMo9-10 replaces the former 11CrMo9-10.

5. Eight new alloy steel grades have been included in the standard:

new basis / corresponding steel grade max. thickness

18MnMo4-5 French grade 18MD4-05

ASTM grade A302 Grade B

250 mm

20MnMoNi4-5 German VdTÜV grade

ASTM grade A533 Grade B

250 mm

15NiCuMoNb5-6-4 German VdTÜV grade 15NiCuMoNb5 200 mm

13CrMoSi5-5 ASTM grade A387 Grade 11 250 mm

X12CrMo5 ASTM grade A387 Grade 5

German VdTÜV grade 12CrMo19-5

250 mm

13CrMoV9-10 ASTM gradeA542 type D 250 mm

12CrMoV12-10 ASTM grade A542 type E 250 mm

X10CrMoVNb9-1 ASTM grade A387 Grade 91 250 mm

6. For all steel grades that have been continued from the preceding standard the maximum plate

thickness is increased from 150 mm to 250 mm.

7. More precise hints for the further processing of steel grades according to this standard are given.

In particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is

defined, expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is

recommended to consult the steel producer.

8. For unalloyed steels there are recommendations for the inspection criteria to be used when a HIC

test (Hydrogen Induced Cracking) according to EN 10229 is ordered.

9. For CrMo steels recommended conditions for the Step-Cooling-Test (time-temperature

treatment) are introduced to check their tendency for embrittlement during the later operation of

the vessel.

A3


EN 10028-3:2003-06

Flat steel products for pressure purposes

Part 3: Weldable fine grain steels, normalized

Main changes compared to the preceding edition:

1. For the quality ranges N, NH and NL1 the range of application is aligned to PED and to the

current demand by changing the impact test requirements as follows:

quality former CH-V transverse values new values

N *) 27 J at 0°C 20 J at -20°C 30 J at -20°C

NH 27 J at 0°C 20 J at -20°C 30 J at -20°C

NL1 27 J at -20°C 20 J at -40°C 27 J at -40°C

NL2 27 J at -50°C 27 J at -50°C

*) In the new edition the N quality only remains for P355.

2. The maximum allowable P and S contents are generally reduced.

3. As the PED prescribes the required proof strength values at elevated temperatures to be

established by statistical methods, a new standard EN 10314 with a corresponding procedure for

the “derivation of minimum proof strength values for steel at elevated temperatures” was

established in 2002. According to this procedure all 0.2 % proof strength values for all steel grades

of part 3 (and also part 2) have been calculated and redetermined .

4. The maximum plate thickness has been increased from 150 mm to 250 mm for all grades. For

P460, however, the tensile test values above 100 mm have to be agreed prior to the order.

5. More precise hints for the further processing of steel grades according to this standard are given.

In particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is

defined, expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is

recommended to consult the steel producer.

6. For unalloyed steels there are recommendations for the inspection criteria to be used when a HIC

test (Hydrogen Induced Cracking) according to EN 10229 is ordered.

A4


EN 10028-4:2003-06

Flat steel products for pressure purposes

Part 4: Nickel-alloy steels with specified low temperature properties

Main changes compared to the preceding edition:

1. The manufacturing of the steel grades 11MnNi5-3 and 13MnNi6-3 by normalizing rolling

instead of normalizing in furnace is no longer permitted.

2. The maximum permissible deviation of the product analysis from the heat analysis concerning

S contents is generally reduced. In case of the steel grade X7Ni9 this also applies to the P value.

3. The designation of the 5%Ni-steel grade 12Ni19 has been changed to X12Ni5.

4. The 9%Ni - steel grade X8Ni9 can be delivered (like before) with a minimum tensile strength of

640 MPa or 680 MPa respectively.

In the former standard the two minimum tensile strength versions “HT640” and “HT680” were also

differing in the minimum impact values of 27 J or 50 J respectively at – 196 °C for Charpy-V

transverse test pieces. As the heat treatment was not clearly defined for the HT640 grade there was

the danger of mixing up the two versions.

In the new edition the minimum impact value is increased from 27 J to 40 J for“640”and the

delivery condition is integrated into the designation of the steel grade. There are now the following

clearly determined possibilities (X7Ni9 is shown to complete the picture):

grade delivery condition Rm (min.) Ch-V transverse at

– 196 ° C (min.)

X8Ni9 + NT640 +N plus +NT 640 MPa 40 J

X8Ni9 + QT640 +QT 640 MPa 40 J

X8Ni9 + QT680 +QT 680 MPa 50 J

X7Ni9 +QT 680 MPa 80 J

5. The maximum plate thickness for the steel grades up to 3.5 % Ni (11MnNi5-3, 13MnNi6-3,

15NiMn6 and 12 Ni14) is increased from 50 mm to 80 mm.

A5


EN 10028-5:2003-06

Flat steel products for pressure purposes

Part 5: Weldable fine grain steels, thermomechanically rolled

Main changes compared to the preceding edition:

More precise hints for the further processing of steel grades according to this standard are given. In

particular the maximum PWHT (Post Weld Heat Treatment) condition for each steel grade is defined,

expressed by a "Time-Temperature Parameter Pcrit.". Above this critical value it is recommended to

consult the steel producer.

EN 10028-6:2003-06

Flat steel products for pressure purposes

Part 6: Weldable fine grain steels, quenched and tempered

Main changes compared to the preceding edition:

The recommendations for the processing of the steel have been updated regarding the references.

Moreover the requirements for the impact test are now valid up to a thickness of 150 mm without

special agreements.

A6

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