Flat products made of steels for pressure purposes – Part 6: Weldable fine grain steels, quenched and tempered
(Supersedes EN 10028-6:2009)
Contents
1 Scope 4 2 Normative references 4 3 Terms and definitions 4 4 Tolerances on dimensions 4 5 Calculation of mass 4 6 Classification and designation 4 6.1 Classification 4 6.2 Designation 5 7 Information to be supplied by the purchaser 5 7.1 Mandatory information 5 7.2 Options 5 7.3 Example for ordering 5 8 Requirements 5 8.1 Steelmaking process 5 8.2 Delivery condition 5 8.3 Chemical composition 6 8.4 Mechanical properties 6 8.5 Surface condition 6 8.6 Internal soundness 6 9 Inspection 6 9.1 Types of inspections and inspections documents 6 9.2 Tests to be carried out 6 9.3 Retests, sorting and reprocessing 6 10 Sampling 6 11 Test methods 6 12 Marking 6 Annex A (informative) Information on weldability 11 Annex B (informative) Changes to the previous version EN 10028-6:2009 12 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of Directive 2014/68/EU aimed to be covered 13
European foreword
This document (EN 10028-6:2017) has been prepared by Technical Committee ECISS/TC 107 "Steels for pressure purposes", the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2018 and conflicting national standards shall be withdrawn at the latest by January 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 10028-6:2009.
This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of Directive 2014/68/EU.
For relationship with Directive 2014/68/EU, see informative Annex ZA, which is an integral part of this document.
A list of changes between this document and the previous version can be found in Annex B.
According to the CEN‑CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
1 Scope
This European Standard specifies the requirements for flat products for pressure equipment made of weldable fine grain steels, quenched and tempered, as specified in Table 1. The requirements in EN 10028-1:2017 also apply.
NOTE Once this European Standard is published in the EU Official Journal (OJEU) under Directive 2014/68/EU, presumption of conformity to the Essential Safety Requirements (ESRs) of Directive 2014/68/EU is limited to technical data of materials in this European Standard (Part 1 and the other relevant part of the series) and does not presume adequacy of the material to a specific item of equipment. Consequently, the assessment of the technical data stated in this material standard against the design requirements of this specific item of equipment to verify that the ESRs of Directive 2014/68/EU are satisfied, needs to be done.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
- EN 1011-1:2009, Welding — Recommendations for welding of metallic materials — Part 1: General guidance for arc welding
- EN 1011-2:2001, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of ferritic steels
- EN 10020:2000, Definition and classification of grades of steel
- EN 10028-1:2017, Flat products made of steels for pressure purposes — Part 1: General requirements
- EN 10204:2004, Metallic products — Types of inspection documents
3 Terms and definitions
For the purposes of this document the terms and definitions given in EN 10028-1:2017 apply.
4 Tolerances on dimensions
See EN 10028-1:2017.
5 Calculation of mass
See EN 10028-1:2017.
6 Classification and designation
6.1 Classification
6.1.1 This document covers the steel grades given in Table 1 in four qualities:
- a) the basic series (P...Q);
- b) series with elevated temperature properties (P...QH);
- c) series with low temperature properties down to –40°C (P...QL1);
- d) series with low temperature properties down to –60°C (P...QL2).
6.1.2 In accordance with EN 10020:2000 all the steels specified in this document are alloy special steels.
6.2 Designation
See EN 10028-1:2017.
7 Information to be supplied by the purchaser
7.1 Mandatory information
See EN 10028-1:2017.
7.2 Options
A number of options is specified in this document and listed below. Additionally the relevant options of EN 10028-1:2017 apply. If the purchaser does not indicate a wish to implement any of these options at the time of enquiry and order, the products shall be supplied in accordance with the basic specification (see also EN 10028-1:2017).
- 1) providing data on suitable welding conditions (see 8.2.2);
- 2) mid thickness test pieces for the impact test (see Clause 10);
- 3) limitation of copper and/or tin content (see Table 1, footnote c);
- 4) no option, intentionally left blank;
- 5) specification of a minimum impact energy of 40 J (see 8.4 and Table 4, footnote a);
- 6) applicability of elevated temperature values for QL grades (see Table 5, footnote a).
7.3 Example for ordering
10 plates with nominal dimensions, thickness = 50 mm, width = 2000 mm, length = 10000 mm, made of a steel grade with the name P355QL2 and the number 1.8869 as specified in EN 10028-6, inspection certificate 3.1 as specified in EN 10204:
10 plates – 50 x 2 000 x 10 000 – EN 10028‑6 – P355QL2 – Inspection certificate 3.1
or
10 plates – 50 x 2 000 x 10 000 – EN 10028‑6 – 1.8869 – Inspection certificate 3.1.
8 Requirements
8.1 Steelmaking process
See EN 10028-1:2017.
8.2 Delivery condition
8.2.1 The products covered by this European Standard shall be supplied in the quenched and tempered condition.
8.2.2 Information on weldability are given in Annex A of this standard.
8.3 Chemical composition
8.3.1 The requirements of Table 1 apply for the chemical composition according to the cast analysis.
8.3.2 The product analysis may deviate from the specified values of the cast analysis given in Table 1 by the values given in Table 2.
| Steel grade | Maximum contents, % by mass | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steel name | Steel number | C | Si | Mn | P | S | N | B | Cr | Mo | Cu c | Nb d | Ni | Ti d | V d | Zr d |
| P355Q | 1.8866 | 0,16 | 0,40 | 1,50 | 0,025 | 0,010 | 0,015 | 0,005 | 0,30 | 0,25 | 0,30 | 0,05 | 0,50 | 0,03 | 0,06 | 0,05 |
| P355QH | 1.8867 | 0,025 | 0,010 | |||||||||||||
| P355QL1 | 1.8868 | 0,020 | 0,008 | |||||||||||||
| P355QL2 | 1.8869 | 0,020 | 0,005 | |||||||||||||
| P460Q | 1.8870 | 0,18 | 0,50 | 1,70 | 0,025 | 0,010 | 0,015 | 0,005 | 0,50 | 0,50 | 0,30 | 0,05 | 1,00 | 0,03 | 0,08 | 0,05 |
| P460QH | 1.8871 | 0,025 | 0,010 | |||||||||||||
| P460QL1 | 1.8872 | 0,020 | 0,008 | |||||||||||||
| P460QL2 | 1.8864 | 0,020 | 0,005 | |||||||||||||
| P500Q | 1.8873 | 0,18 | 0,60 | 1,70 | 0,025 | 0,010 | 0,015 | 0,005 | 1,00 | 0,70 | 0,30 | 0,05 | 1,50 | 0,05 | 0,08 | 0,15 |
| P500QH | 1.8874 | 0,025 | 0,010 | |||||||||||||
| P500QL1 | 1.8875 | 0,020 | 0,008 | |||||||||||||
| P500QL2 | 1.8865 | 0,020 | 0,005 | |||||||||||||
| P690Q | 1.8879 | 0,20 | 0,80 | 1,70 | 0,025 | 0,010 | 0,015 | 0,005 | 1,50 | 0,70 | 0,30 | 0,06 | 2,50 | 0,05 | 0,12 | 0,15 |
| P690QH | 1.8880 | 0,025 | 0,010 | |||||||||||||
| P690QL1 | 1.8881 | 0,020 | 0,008 | |||||||||||||
| P690QL2 | 1.8888 | 0,020 | 0,005 | |||||||||||||
|
a Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate measures shall be taken to prevent the addition from scrap and other materials used in steelmaking of these elements which may adversely affect the mechanical properties and usability. b The manufacturer may add one or several alloying element(s) up to the maximum values specified in the order as a function of the product thickness and the steelmaking conditions in order to attain the specified properties. c A lower maximum copper content and/or a maximum sum of copper and tin content, e.g. Cu + 6 Sn ≤ 0,33 %, may be agreed upon at the time of enquiry and order, e.g. with regard to hot formability. d The percentage of grain refining elements shall be at least 0,015 %. Aluminium is also included in these elements. The minimum content of 0,015 % applies here to dissolved aluminium. This value is regarded as attained if the total aluminium content is at least 0,018 %; in cases of dispute, the dissolved aluminium content is to be determined. |
||||||||||||||||
| Element | Specified value in the cast analysis according to Table 1 % by mass | Permissible deviation a of the product analysis % by mass |
|---|---|---|
| C | ≤ 0,20 | + 0,02 |
| Si | ≤ 0,80 | + 0,05 |
| Mn | ≤ 1,70 | + 0,10 |
| P | ≤ 0,025 | + 0,005 |
| S | ≤ 0,010 | + 0,003 |
| Altotal | ≥ 0,018 | - 0,005 |
| N | ≤ 0,015 | + 0,002 |
| B | ≤ 0,005 | + 0,0005 |
| Cr | ≤ 1,50 | + 0,10 |
| Mo | ≤ 0,70 | + 0,04 |
| Cu | ≤ 0,30 | + 0,05 |
| Ni | ≤ 2,50 | + 0,10 |
| Nb | ≤ 0,06 | + 0,01 |
| Ti | ≤ 0,05 | + 0,01 |
| V | ≤ 0,12 | + 0,01 |
| Zr | ≤ 0,15 | + 0,01 |
| a If several product analysis are carried out on one cast, and then 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 value or fall short of the permissible minimum value, but not both for one cast. | ||
8.4 Mechanical properties
The values given in Tables 3 to 5 apply (see also EN 10028-1:2017 and Clause 10).
Optionally, a minimum impact energy value of 40 J may be specified for temperatures where lower minimum values are specified (see Table 4, footnote a).
| Steel grade | Yield strength a ReH for nominal thickness t in mm MPa min. |
Tensile strength Rm for nominal thickness t in mm MPa |
Elongation after fracture A % min. |
||||
|---|---|---|---|---|---|---|---|
| Steel name | Steel number | t ≤ 50 | 50 < t ≤ 100 | 100 < t ≤ 200 | t ≤ 100 | 100 < t ≤ 200 | |
| P355Q | 1.8866 | 355 | 335 | 315 | 490 to 630 |
450 to 590 |
22 |
| P355QH | 1.8867 | ||||||
| P355QL1 | 1.8868 | ||||||
| P355QL2 | 1.8869 | ||||||
| P460Q | 1.8870 | 460 | 440 | 400 | 550 to 720 |
500 to 670 |
19 |
| P460QH | 1.8871 | ||||||
| P460QL1 | 1.8872 | ||||||
| P460QL2 | 1.8864 | ||||||
| P500Q | 1.8873 | 500 | 480 | 440 | 590 to 770 |
540 to 720 |
17 |
| P500QH | 1.8874 | ||||||
| P500QL1 | 1.8875 | ||||||
| P500QL2 | 1.8865 | ||||||
| P690Q | 1.8879 | 690 | 670 | 630 | 770 to 940 |
720 to 900 |
14 |
| P690QH | 1.8880 | ||||||
| P690QL1 | 1.8881 | ||||||
| P690QL2 | 1.8888 | ||||||
| a The yield strength to be determined shall be the upper yield strength ReH or, if this is not pronounced, the 0,2 % proof strength Rp0,2. | |||||||
| Steel grade | Nominal thickness mm | Impact energy KV2 / J at a temperature in °C of | ||||
|---|---|---|---|---|---|---|
| -60 | -40 | -20 | 0 | +20 | ||
| P...Q P...QH | ≤ 200 | – | – | 27 a | 40 | 60 |
| P...QL1 | ≤ 200 | – | 27 a | 40 | 60 | – |
| P...QL2 | ≤ 200 | 27 a | 40 | 60 | 80 | – |
| a A minimum impact energy value of 40 J may be agreed at the time of enquiry and order. | ||||||
| Steel grade a | Minimum 0,2 % proof strength Rp0,2 values b in MPa at a temperature in °C of | ||||||
|---|---|---|---|---|---|---|---|
| Steel name | Steel number | 50 | 100 | 150 | 200 | 250 | 300 |
| P355QH | 1.8867 | 340 | 310 | 285 | 260 | 235 | 215 |
| P460QH | 1.8871 | 440 | 425 | 405 | 380 | 360 | 340 |
| P500QH | 1.8874 | 490 | 470 | 450 | 420 | 400 | 380 |
| P690QH | 1.8880 | 670 | 645 | 615 | 595 | 575 | 570 |
|
a If agreed at the time of enquiry and order, these values also apply to the grades P...QL with specified low temperature properties. b These values are valid for nominal thicknesses t ≤ 50 mm. For larger nominal thicknesses, the minimum 0,2 % proof strength values are reduced by: 20 MPa for 50 mm < t ≤ 100 mm and by 60 MPa for t > 100 mm. | |||||||
8.5 Surface condition
See EN 10028-1:2017.
8.6 Internal soundness
See EN 10028-1:2017.
9 Inspection
9.1 Types of inspections and inspections documents
See EN 10028-1:2017.
9.2 Tests to be carried out
See EN 10028-1:2017.
9.3 Retests, sorting and reprocessing
See EN 10028-1:2017.
10 Sampling
See EN 10028-1:2017.
For the impact test, deviating from EN 10028-1:2017, Table 4, footnote g, the preparation of test pieces taken from the mid thickness may be agreed at the time of enquiry and order. In this case, test temperatures and minimum impact energy values shall also be agreed.
11 Test methods
See EN 10028-1:2017.
12 Marking
See EN 10028-1:2017.
Annex A (informative) Information on weldability
The steels specified in this European Standard shall be suitable for welding processes in current use. Information on welding is given in EN 1011‑1 and EN 1011‑2.
The manufacturer shall, if requested, provide the purchaser with data on suitable welding conditions determined on the basis of weld procedure tests.
Excessive post weld heat‑treatment (PWHT) conditions can decrease the mechanical properties. Where in stress relieving the intended time temperature parameter
P = Ts (20 + lg t) · 10−3
where
Ts is the stress relieving temperature in K, and t is holding time in hours,
exceeds the critical value of Pcrit = 17,3 the purchaser should in his enquiry and order inform the manufacturer accordingly and, where appropriate, tests on simulated post weld heat treated samples can be agreed to check whether after such a treatment the properties specified in this European Standard can still be regarded as valid in accordance with the essential safety requirements of the PED.
Annex B (informative) Changes to the previous version EN 10028-6:2009
- the normative references have been revised;
- EN 1011-1 and EN 1011-2 have been considered as normative references;
- the marking of text passages with one or two dots has been deleted;
- correlation in Annex ZA between the clause of this European Standard and the essential requirements of the Directive 2014/68/EU have been updated;
- clarification on various technical requirements.
Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of Directive 2014/68/EU aimed to be covered
This European Standard has been prepared under a Commission's standardization request M/071 to provide one voluntary means of conforming to Essential Requirements of Directive 2014/68/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive, compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of Directive 2014/68/EU, and associated EFTA regulations.
| Requirements of Directive 2014/68/EU | Clause(s)/subclause(s) of this EN | Remarks/Notes |
|---|---|---|
| 4.1a | 8.4, Tables 3 and 4 | Appropriate material properties |
| 4.1d | 8.2 and 8.5 | Suitable for the processing procedures |
| 4.3 | 9.1 | Inspection documentation |
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European Standard is maintained in the list published in the Official Journal of the European Union. Users of this standard should consult frequently the latest list published in the Official Journal of the European Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of this standard.
