EN ISO 2560:2020

SLOVENSKI STANDARD
01-november-2020
Nadomešča:
SIST EN ISO 2560:2010
Dodajni in pomožni materiali za varjenje - Oplaščene elektrode za ročno obločno
varjenje nelegiranih in drobnozrnatih jekel - Razvrstitev (ISO 2560:2020)
Welding consumables - Covered electrodes for manual metal arc welding of non-alloy
and fine grain steels - Classification (ISO 2560:2020)
Schweißzusätze - Umhüllte Stabelektroden zum Lichtbogenhandschweißen von
unlegierten Stählen und Feinkornstählen - Einteilung (ISO 2560:2020)
Produits consommables pour le soudage - Électrodes enrobées pour le soudage manuel
à l'arc des aciers non alliés et des aciers à grains fins - Classification (ISO 2560:2020)
Ta slovenski standard je istoveten z: EN ISO 2560:2020
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2560
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 25.160.20 Supersedes EN ISO 2560:2009
English Version
Welding consumables - Covered electrodes for manual
metal arc welding of non-alloy and fine grain steels -
Classification (ISO 2560:2020)
Produits consommables pour le soudage - Électrodes Schweißzusätze - Umhüllte Stabelektroden zum
enrobées pour le soudage manuel à l'arc des aciers non Lichtbogenhandschweißen von unlegierten Stählen
alliés et des aciers à grains fins - Classification (ISO und Feinkornstählen - Einteilung (ISO 2560:2020)
2560:2020)
This European Standard was approved by CEN on 16 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2560:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2560:2020) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” 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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 2560:2009.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 2560:2020 has been approved by CEN as EN ISO 2560:2020 without any modification.

INTERNATIONAL ISO
STANDARD 2560
Fourth edition
2020-08
Welding consumables — Covered
electrodes for manual metal arc
welding of non-alloy and fine grain
steels — Classification
Produits consommables pour le soudage — Électrodes enrobées pour
le soudage manuel à l'arc des aciers non alliés et des aciers à grains
fins — Classification
Reference number
ISO 2560:2020(E)
©
ISO 2020
ISO 2560:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 2560:2020(E)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
5 Symbols and requirements . 3
5.1 Symbol for the product/process . 3
5.2 Symbols for strength and elongation of all-weld metal . 3
5.3 Symbol for impact properties of all-weld metal . 5
5.4 Symbol for the chemical composition of all-weld metal . 5
5.5 Symbol for type of electrode covering . 7
5.6 Symbol for condition of post-weld heat-treatment of all-weld metal . 9
5.7 Symbol for electrode efficiency and type of current .10
5.8 Symbol for welding position .10
5.9 Symbol for diffusible hydrogen content of deposited metal . .11
6 Mechanical tests .11
6.1 Preheating and interpass temperatures .12
6.2 Pass sequence .14
7 Chemical analysis .15
8 Fillet weld test .20
9 Rounding procedure .22
10 Retests .22
11 Technical delivery conditions .22
12 Examples of designation .23
Annex A (informative) Classification systems .25
Annex B (informative) Description of types of electrode covering — Classification by yield
strength and 47 J impact energy .28
Annex C (informative) Description of types of electrode covering — Classification by tensile
strength and 27 J impact energy .30
Annex D (informative) Notes on diffusible hydrogen and the avoidance of cold cracking .33
Bibliography .34
ISO 2560:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 3, Welding consumables, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 121, Welding and allied processes, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
Official interpretations of ISO/TC 44 documents, where they exist, are available from this page: https://
committee .iso .org/ sites/ tc44/ home/ interpretation .html.
This fourth edition cancels and replaces the third edition (ISO 2560:2009), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— all the references have been updated;
— throughout the document, “nominal electrode efficiency” now reads “electrode efficiency”;
— in 4B, “strength” has been clarified by changing to “tensile strength;
— in Table 3B, the “Nominal level” for Mn shown in the 1st row of the table for “No symbol, -1, -P1, or
–P2” was changed to 1,3;
— in Table 3B, a new footnote has been added regarding G classifications (similar to Table 3A);
— in Table 4B, a new footnote d to symbol “45” was added “Not including PF (vertical up)”;
— in Table 8B, the heading of the last column has been revised to read " Impact test temperature”;
— in Table 8B, NS (not specified) has been changed to NR (not required) and a new footnote c regarding
testing at lower temperatures has been added;
iv © ISO 2020 – All rights reserved

ISO 2560:2020(E)
— in Table 10B, E4918, E4918-1, E5516-3M3, E5516-N3 and E5516-N7 have been updated to match
values in AWS standards;
— in Clause 8, b has been changed to w for width in accordance with ISO 15792-1;
— in Clause 9, Rounding procedure has been updated to match current agreed wording;
— in Clause 12B, Example 1B, the %Mn was changed to 0,90 to better match the designation given in
the example;
ISO 2560:2020(E)
Introduction
This document recognizes that there are two somewhat different approaches in the global market to
classifying a given electrode, and allows for either or both to be used, to suit a particular market need.
Application of either type of classification designation (or of both, where suitable) identifies a product
as classified in accordance with this document. The classification in accordance with system A is mainly
based on EN 499:1994. The classification in accordance with system B is mainly based on standards
used around the Pacific Rim.
This document provides a classification in order to designate covered electrodes in terms of the yield
strength, tensile strength and elongation of the all-weld metal. The ratio of yield strength to tensile
strength of weld metal is generally higher than that of parent metal. Users should note that matching
weld metal yield strength to parent metal yield strength does not necessarily ensure that the weld
metal tensile strength matches that of the parent metal. Therefore, where the application requires
matching tensile strength, selection of the consumable should be made by reference to column 3 of
Table 1A or to Table 1B and Table 8B.
It should be noted that the mechanical properties of all-weld metal test specimens used to classify the
electrodes vary from those obtained in production joints because of differences in welding procedure
such as electrode size, width of weave, welding position, welding current, interpass temperature and
parent metal composition.
vi © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 2560:2020(E)
Welding consumables — Covered electrodes for manual
metal arc welding of non-alloy and fine grain steels —
Classification
1 Scope
This document specifies requirements for the classification of covered electrodes and deposited metal
in the as-welded condition and in the post-weld heat-treated condition for manual metal arc welding of
non-alloy and fine grain steels with a minimum yield strength of up to 500 MPa or a minimum tensile
strength of up to 570 MPa.
This document is a combined specification providing for classification utilizing a system based on the
yield strength and the average impact energy of 47 J of all-weld metal, or utilizing a system based on the
tensile strength and the average impact energy of 27 J of all-weld metal.
a) Clauses, subclauses and tables which carry the suffix letter “A” are applicable only to covered
electrodes classified to the system based on the yield strength and the average impact energy of
47 J of all weld metal in this document.
b) Clauses, subclauses and tables which carry the suffix letter “B” are applicable only to covered
electrodes classified to the system based on the tensile strength and the average impact energy of
27 J of all weld metal in this document.
c) Clauses, subclauses and tables which do not have either the suffix letter “A” or the suffix letter “B”
are applicable to all covered electrodes classified in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 544, Welding consumables — Technical delivery conditions for filler materials and fluxes — Type of
product, dimensions, tolerances and markings
ISO 2401, Covered electrodes — Determination of the efficiency, metal recovery and deposition coefficient
ISO 3690, Welding and allied processes — Determination of hydrogen content in arc weld metal
ISO 6847, Welding consumables — Deposition of a weld metal pad for chemical analysis
ISO 6947:2019, Welding and allied processes — Welding positions
ISO 14344, Welding consumables — Procurement of filler materials and fluxes
ISO 15792-1:2020, Welding consumables — Test methods — Part 1: Test methods for all-weld metal test
specimens in steel, nickel and nickel alloys
ISO 15792-3:2011, Welding consumables — Test methods — Part 3: Classification testing of positional
capacity and root penetration of welding consumables in a fillet weld
ISO 80000-1:2009, Quantities and units — Part 1: General. Corrected by ISO 80000-1:2009/Cor 1:2011
ISO 2560:2020(E)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Classification
Classification designations are based on two approaches to indicate the tensile properties and the
impact properties of the all-weld metal obtained with a given electrode. The two designation approaches
include additional designators for some other classification requirements, but not all. In most cases,
a given commercial product can be classified in both systems. Then, either or both classification
designations can be used for the product.
The classification includes all-weld metal properties obtained with a covered electrode as given below.
The classification is based on an electrode size of 4,0 mm, with the exception of the symbol for welding
position, which is based on ISO 15792-3. Where the defined diameter has not been manufactured, the
closest diameter to 4,0 mm shall be used for all-weld metal tests.
4A  Classification by yield strength and 47 J 4B  Classification by tensile strength and 27 J
impact energy impact energy
The classification is divided into eight parts: The classification is divided into seven parts:
1) the first part gives a symbol indicating the 1) the first part gives a symbol indicating the
product/process to be identified; product/process to be identified;
2) the second part gives a symbol indicating 2) the second part gives a symbol indicating
the strength and elongation of all-weld metal the tensile strength of all-weld metal
(see Table 1A); (see Table 1B);
3) the third part gives a symbol indicating 3) the third part gives a symbol indicating
the impact properties of all-weld metal the type of electrode covering, the type
(see Table 2A); of current, and the welding position
(see Table 4B);
4) the fourth part gives a symbol indicating
the chemical composition of all-weld metal 4) the fourth part gives a symbol indicating
(see Table 3A); the chemical composition of all-weld metal
(see Table 3B);
5) the fifth part gives a symbol indicating the
type of electrode covering (see 5.5A); 5) the fifth part gives a symbol indicating the
condition of post-weld heat treatment under
6) the sixth part gives a symbol indicating the
which the all-weld metal test was conducted
electrode efficiency and type of current
(see 5.6B);
(see Table 5A);
6) the sixth part gives a symbol indicating that
7) the seventh part gives a symbol indicating
the electrode has satisfied a requirement
the welding position (see Table 6A);
for 47 J impact energy at the temperature
normally used for the 27 J requirement;
8) the eighth part gives a symbol indicating the
diffusible hydrogen content of the deposited
7) the seventh part gives a symbol indicating
metal (see Table 7).
the diffusible hydrogen content of the
deposited metal (see Table 7).
2 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
In order to promote the use of this document, In order to promote the use of this document,
the classification is split into two sections: the classification is split into two sections:
a) Compulsory section a) Compulsory section
This section includes the symbols for the type of This section includes the symbols for the type
product, the strength and elongation, the impact of product, the strength, the type of covering,
properties, the chemical composition and the the type of current, the welding position, the
type of covering, i.e. the symbols defined in 5.1, chemical composition and the condition of heat
5.2A, 5.3A, 5.4A and 5.5A. treatment, i.e. the symbols defined in 5.1, 5.2B,
5.4B, 5.5B and 5.6B.
b) Optional section b) Optional section
This section includes the symbols for the elec- This section includes the symbol for the optional
trode efficiency, the type of current, the welding supplemental designator for 47 J impact energy,
positions for which the electrode is suitable, and i.e. the symbol defined in 5.3B; and the symbol
the symbol for diffusible hydrogen content, i.e. for diffusible hydrogen content, i.e., the symbol
the symbols defined in 5.7A, 5.8A and 5.9. defined in 5.9.
The designation (see Clause 12), compulsory section and any chosen elements of the optional section,
shall be used on packages and in the manufacturer's literature and data sheets. Figure A.1 gives
a schematic representation of the full designation of electrodes classified by yield strength and
47 J impact energy (system A). Figure A.2 gives a schematic representation of the full designation of
electrodes classified by tensile strength and 27 J impact energy (system B).
5 Symbols and requirements
5.1 Symbol for the product/process
The symbol for the covered electrode used in the manual metal arc welding process shall be the letter E
placed at the beginning of the designation.
5.2 Symbols for strength and elongation of all-weld metal
5.2A  Classification by yield strength and 47 J 5.2B  Classification by tensile strength and
impact energy 27 J impact energy
The symbols in Table 1A indicate the yield The symbols in Table 1B indicate the tensile
strength, tensile strength, and elongation of the strength of the all-weld metal in the as-welded
all-weld metal in the as-welded condition, deter- condition or in the post-weld heat-treated con-
mined in accordance with Clause 6. dition, determined in accordance with Clause 6.
The yield strength and elongation requirements
depend on the specific chemical composition,
heat treatment condition and coating type, as
well as on the tensile strength requirements, as
given for the complete classification in Table 8B.
ISO 2560:2020(E)
Table 1A — Symbol for strength and elonga- Table 1B — Symbol for strength of all-weld
tion of all-weld metal metal
(Classification by yield strength and 47 J (Classification by tensile strength and 27 J
impact energy) impact energy)
Minimum
Tensile Minimum Minimum tensile
yield
b
strength elongation strength
a
Symbol Symbol
strength
MPa MPa % MPa
35 355 440 to 570 22 43 430
38 380 470 to 600 20 49 490
42 420 500 to 640 20 55 550
46 460 530 to 680 20 57 570
50 500 560 to 720 18
a
For yield strength, the lower yield strength
(R ) shall be used when yielding occurs.
eL
Otherwise, the 0,2 % proof strength (R ) shall
p0,2
be used.
b
The gauge length is equal to five times the
specimen diameter.
4 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
5.3 Symbol for impact properties of all-weld metal
5.3A  Classification by yield strength and 5.3B  Classification by tensile strength and
47 J impact energy 27 J impact energy
The symbols in Table 2A indicate the tempera- There is no specific symbol for impact prop-
ture at which an average impact energy of 47 J is erties. The complete classification in Table 8B
achieved under the conditions given in Clause 6. determines the temperature at which an impact
Three specimens shall be tested. Only one energy of 27 J is achieved in the as-welded con-
individual value may be lower than 47 J but not dition or in the post-weld heat-treated condition
lower than 32 J. When an all-weld metal has been under the conditions given in Clause 6. Five test
classified for a certain temperature, it automati- specimens shall be tested. The lowest and highest
cally covers any higher temperature in Table 2A. values obtained shall be disregarded. Two of the
three remaining values shall be greater than the
Table 2A — Symbol for impact properties of
specified 27 J level, one of the three may be lower
all-weld metal
but shall not be less than 20 J. The average of the
(Classification by yield strength and 47 J
three remaining values shall be at least 27 J.
impact energy)
The addition of the optional symbol U, immedi-
ately after the symbol for condition of heat treat-
Temperature for minimum
ment, indicates that the supplemental require-
average impact energy of 47 J
Symbol
ment of 47 J impact energy at the normal 27 J
°C
impact test temperature has also been satisfied.
For the 47 J impact requirement, the number of
Z No requirement
specimens tested and values obtained shall meet
the requirement of 5.3A.
A +20
0 0
2 −20
3 −30
4 −40
5 −50
6 −60
5.4 Symbol for the chemical composition of all-weld metal
5.4A  Classification by yield strength and 5.4B  Classification by tensile strength and
47 J impact energy 27 J impact energy
The symbols in Table 3A indicate the chemical The symbols in Table 3B indicate the principal
composition of all-weld metal, determined in alloying elements, and sometimes the nominal
accordance with Clause 7. alloy level of the most significant alloy element,
of all-weld metal, determined in accordance
with Clause 7. The symbol for chemical compo-
sition does not immediately follow the symbol
for strength but follows the symbol for coat-
ing type. The complete classification, given in
Table 10B, determines the exact chemical com-
position requirements for a particular electrode
classification.
ISO 2560:2020(E)
Table 3A — Symbol for chemical Table 3B — Symbol for chemical
composition of all-weld metal composition of all-weld metal
(Classification by yield strength and 47 J (Classification by tensile strength and 27 J
impact energy) impact energy)
Chemical composition
Chemical composition
a,b,c
% (by mass)
Alloy Alloy
symbol symbol
Principal alloy Nominal level
Mn Mo Ni
element(s) % (by mass)
No symbol, −1,
No symbol 2,0 — — Mn 1,3
−P1 or −P2
Mo 1,4 0,3 to 0,6 — −1M3 Mo 0,5
Mn 1,5
MnMo 1,4 to 2,0 0,3 to 0,6 — −3M2
Mo 0,4
Mn 1,5
1Ni 1,4 — 0,6 to 1,2 −3M3
Mo 0,5
Mn1Ni 1,4 to 2,0 — 0,6 to 1,2 −N1 Ni 0,5
2Ni 1,4 — 1,8 to 2,6 −N2 Ni 1,0
Mn2Ni 1,4 to 2,0 — 1,2 to 2,6 −N3 Ni 1,5
Mn 1,5
3Ni 1,4 — 2,6 to 3,8 −3N3
Ni 1,5
1NiMo 1,4 0,3 to 0,6 0,6 to 1,2 −N5 Ni 2,5
c
Z Any other agreed composition −N7 Ni 3,5
a
If not specified, Mo < 0,2; Ni < 0,3; Cr < 0,2; −N13 Ni 6,5
V < 0,05; Nb < 0,05; Cu < 0,3.
Ni 1,0
−N2M3
b
Mo 0,5
Single values shown in the table mean
maximum values.
Ni 0,5
−NC
Cu 0,4
c
Consumables for which the chemical
Cr 0,5
composition is not listed in the table shall be
−CC
symbolized similarly and prefixed by the letter Cu 0,4
Z. The chemical composition ranges are not
Ni 0,2
specified and therefore two electrodes with the
−NCC Cr 0,6
same Z-classification may not be
Cu 0,5
interchangeable.
Ni 0,6
−NCC1 Cr 0,6
Cu 0,5
Ni 0,3
−NCC2 Cr 0,2
Cu 0,5
a
−G Any other agreed composition
a
The chemical composition ranges are not
specified and therefore two electrodes with the
same G-classification may not be
interchangeable.
6 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
5.5 Symbol for type of electrode covering
5.5A  Classification by yield strength and 5.5B  Classification by tensile strength and
47 J impact energy 27 J impact energy
The type of covering of a covered electrode de- The type of covering of a covered electrode de-
pends substantially on the types of slag-forming pends substantially on the types of slag-forming
components. The symbols indicating the cover- components. The type of covering also deter-
ing type shall be in accordance with Table 4A. mines the positions suitable for welding and the
type of current, in accordance with Table 4B.
ISO 2560:2020(E)
Table 4A — Symbol for type of covering Table 4B — Symbol for type of covering
(Classification by yield strength and 47 J (Classification by tensile strength and 27 J
impact energy) impact energy)
Type of Welding Type of
Symbol Type of covering Symbol
a b
covering positions current
AC and
c
A Acid covering 03 Rutile basic All
DC (±)
C Cellulosic covering 10 Cellulosic All DC (+)
AC and
R Rutile covering 11 Cellulosic All
DC (+)
AC and
c
RR Rutile thick covering 12 Rutile All
DC (−)
Rutile-cellulosic cov- AC and
c
RC 13 Rutile All
ering DC (±)
Rutile + AC and
c
RA Rutile-acid covering 14 All
iron powder DC (±)
c
RB Rutile-basic covering 15 Basic All DC (+)
AC and
c
B Basic covering 16 Basic All
DC (+)
NOTE  A description of the characteristics
Basic + iron AC and
c
of each of the types of covering is given in 18 All
powder DC (+)
Annex B.
AC and
c
19 Ilmenite All
DC (±)
AC and
20 Iron oxide PA, PB
DC (−)
Rutile + AC and
24 PA, PB
iron powder DC (±)
Iron oxide + AC and
27 PA, PB
iron powder DC (±)
Basic + iron AC and
28 PA, PB, PC
powder DC (+)
Not Manufacturer's
specified recommendations
d
45 Basic All DC (+)
AC and
48 Basic All
DC (+)
NOTE  A description of the characteristics
of each of the types of covering is given in
Annex C.
a
Positions in accordance with ISO 6947:2019.
PA = flat, PB = horizontal vertical fillet,
PC = horizontal, PG = vertical down.
b
Alternating current = AC; direct current = DC.
c
The indication “all positions” may or may not
include vertical down welding. This shall be
specified in the manufacturer's literature.
d
Not including PF (vertical up).
8 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
5.6 Symbol for condition of post-weld heat-treatment of all-weld metal
5.6A  Classification by yield strength and 5.6B Classification by tensile strength and
47 J impact energy 27 J impact energy
Classification is based on mechanical properties If the electrode has been classified in the
of the all-weld metal in the as-welded condition as-welded condition, the symbol A shall be added
only. There is no symbol for condition of post- to the classification. If the electrode has been
weld heat treatment. classified in the post-weld heat-treated condi-
tion, the symbol P shall be added to the classifi-
cation. When classified in the post-weld
heat-treated condition, the temperature of
post-weld heat treatment shall be 620 °C ± 15 °C,
except for chemical compositions N5 and N7,
where the temperature shall be 605 °C ± 15 °C,
and chemical composition N13, where the
temperature shall be 600 °C ± 15 °C. Post-weld
+15
heat treatment time shall be 60()min at
temperature. If the electrode has been classified
in both conditions, the symbol AP shall be added
to the classification.
The furnace shall be at a temperature not higher
than 300 °C when the test assembly is placed
in it. The heating rate, from that point to the
specified holding temperature, shall be 85 °C
to 275 °C/h. When the holding time has been
completed, the assembly shall be allowed to cool
in the furnace to a temperature below 300 °C at
a rate not exceeding 200 °C/h. The assembly may
be removed from the furnace at any temperature
below 300 °C and allowed to cool in still air to
room temperature.
ISO 2560:2020(E)
5.7 Symbol for electrode efficiency and type of current
5.7A  Classification by yield strength and 5.7B  Classification by tensile strength and
47 J impact energy 27 J impact energy
The symbols in Table 5A indicate electrode effi- There is no specific symbol for electrode ef-
ciency, determined in accordance with ISO 2401 ficiency and type of current. Type of current
with the type of current shown in Table 5A. is included in the symbol for type of covering
(Table 4B). Electrode efficiency is not addressed.
Table 5A — Symbol for electrode efficiency
and type of current
(Classification by yield strength and 47 J
impact energy)
Electrode Type of
Symbol
a,b
efficiency, η, % current
1 η ≤ 105 AC and DC
2 η ≤ 105 DC
3 105 < η ≤ 125 AC and DC
4 105 < η ≤ 125 DC
5 125 < η ≤ 160 AC and DC
6 125 < η ≤ 160 DC
7 η > 160 AC and DC
8 η > 160 DC
a
If an electrode is suitable for both DC and AC
operation, the electrode efficiency shall be based
on AC testing only.
b
Alternating current = AC; direct current = DC.
5.8 Symbol for welding position
5.8A  Classification by yield strength and 47 J 5.8B  Classification by tensile strength and
impact energy 27 J impact energy
The symbols in Table 6A for welding positions There is no specific symbol for welding position.
indicate the positions for which the electrode is The welding position requirements are included
tested in accordance with ISO 15792-3. For test- with the symbol for type of covering (Table 4B).
ing requirements (see Clause 8).
10 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
Table 6A — Symbol for welding position
(Classification by yield strength and 47 J
impact energy)
Welding positions in
Symbol accordance with
ISO 6947:2019
1 PA, PB, PC, PD, PE, PF, PG
2 PA, PB, PC, PD, PE, PF
3 PA, PB
4 PA
5 PA, PB, PG
5.9 Symbol for diffusible hydrogen content of deposited metal
The symbols in Table 7 indicate diffusible hydrogen content determined in deposited metal from an
electrode of size 4 mm in accordance with the method given in ISO 3690. The current used shall be
70 % to 90 % of the maximum value recommended by the manufacturer. Electrodes recommended for
use with AC and DC shall be tested using AC. Electrodes recommended for DC only shall be tested using
DC with electrode positive.
The manufacturer shall provide information on the recommended type of current and redrying
conditions for achieving the diffusible hydrogen levels.
Table 7 — Symbol for diffusible hydrogen content of deposited metal
Diffusible hydrogen content
Symbol maximum
ml/100 g of deposited weld metal
H5 5
H10 10
H15 15
Annex D provides additional information about diffusible hydrogen.
6 Mechanical tests
6A  Classification by yield strength and 47 J 6B  Classification by tensile strength and 27 J
impact energy impact energy
Tensile and impact tests and any required retests Tensile and impact tests and any required retests
shall be carried out in the as-welded condition shall be carried out in the as-welded condition
using an all-weld metal test assembly type 1.3 in and/or in the post-weld heat-treated condition,
accordance with ISO 15792-1:2020 and the weld- using an all-weld metal test assembly type 1.3 in
ing conditions described in 6.1 and 6.2. accordance with ISO 15792-1:2020 and the weld-
ing conditions described in 6.1 and 6.2.
When diffusible hydrogen removal treatment is specified by the manufacturer, it shall be carried out in
accordance with ISO 15792-1.
ISO 2560:2020(E)
6.1 Preheating and interpass temperatures
The preheating and interpass temperatures shall be measured using temperature indicator crayons,
surface thermometers or thermocouples (for example, in accordance with ISO 13916).
6.1A  Classification by yield strength and 47 J 6.1B  Classification by tensile strength and
impact energy 27 J impact energy
Preheating is not required; welding may start Preheating and interpass temperature for elec-
from room temperature. The interpass tempera- trodes with no chemical composition symbol
ture shall be in the range 90 °C to 175 °C. If, after or with the −1 symbol in Tables 3B and 8B shall
any pass, the interpass temperature is exceeded, be 100 °C to 150 °C. Preheating and interpass
the test assembly shall be cooled in air to a tem- temperatures for all other compositions shall be
perature below that limit. 90 °C to 110 °C.
To reach tensile test requirements and impact
properties at the same time, it can be necessary to
keep the interpass temperature in a small range.
Table 8B — Mechanical test requirements
(Classification by tensile strength and 27 J impact energy)
a
Elongation Impact test
a a
Tensile strength Yield strength
b,c
A temperature
Classification
MPa MPa % °C
E4303 430 330 20 0
E4310 430 330 20 −30
E4311 430 330 20 −30
E4312 430 330 16 NR
E4313 430 330 16 NR
E4316 430 330 20 −30
E4318 430 330 20 −30
E4319 430 330 20 −20
E4320 430 330 20 NR
E4324 430 330 16 NR
E4327 430 330 20 −30
E4340 430 330 20 0
E4903 490 400 20 0
E4910 490 to 650 400 20 −30
E4911 490 to 650 400 20 −30
E4912 490 400 16 NR
E4913 490 400 16 NR
E4914 490 400 16 NR
E4915 490 400 20 −30
E4916 490 400 20 −30
E4916-1 490 400 20 −45
E4918 490 400 20 −30
E4918-1 490 400 20 −45
a
Single values are minimum requirements.
b
NR = impact testing is not required.
c
Testing at a lower temperature is permitted but the requirements of 5.3B shall still be met.
12 © ISO 2020 – All rights reserved

ISO 2560:2020(E)
Table 8B (continued)
a
Elongation Impact test
a a
Tensile strength Yield strength
b,c
A temperature
Classification
MPa MPa % °C
E4919 490 400 20 −20
E4924 490 400 16 NR
E4924-1 490 400 20 −20
E4927 490 400 20 −30
E4928 490 400 20 −20
E4948 490 400 20 −30
E5716 570 490 16 −30
E5728 570 490 16 −20
E4910-P1 490 420 20 −30
E5510-P1 550 460 17 −30
E5518-P2 550 460 17 −30
E5545-P2 550 460 17 −30
E4910-1M3 490 420 20 NR
E4911-1M3 490 400 20 NR
E4915-1M3 490 400 20 NR
E4916-1M3 490 400 20 NR
E4918-1M3 490 400 20 NR
E4919-1M3 490 400 20 NR
E4920-1M3 490 400 20 NR
E4927-1M3 490 400 20 NR
E5518-3M2 550 460 17 −50
E5516-3M3 550 460 17 −50
E5518-3M3 550 460 17 −50
E4916-N1 490 390 20 −40
E4928-N1 490 390 20 −40
E5516-N1 550 460 17 −40
E5528-N1 550 460 17 −40
E4916-N2 490 390 20 −40
E4918-N2 490 390 20 −50
E5516-N2 550 470 to 550 20 −40
E5518-N2 550 470 to 550 20 −40
E4916-N3 490 390 20 −40
E5516-N3 550 460 17 −50
E5516-3N3 550 460 17 −50
E5518-N3 550 460 17 −50
E4915-N5 490 390 20 −75
E4916-N5 490 390 20 −75
E4918-N5 490 390 20 −75
E4928-N5 490 390 20 −60
a
Single values are minimum requirements.
b
NR = impact testing is not required.
c
Testing at a lower temperature is permitted but the requirements of 5.3B shall still be met.
ISO 2560:2020(E)
Table 8B (continued)
a
Elongation Impact test
a a
Tensile strength Yield strength
b,c
A temperature
Classification
MPa MPa % °C
E5516-N5 550 460 17 −60
E5518-N5 550 460 17 −60
E4915-N7 490 390 20 −100
E4916-N7 490 390 20 −100
E4918-N7 490 390 20 −100
E5516-N7 550 460 17 −75
E5518-N7 550 460 17 −75
E5516-N13 550 460 17 −100
E5518-N2M3 550 460 17 −40
E4903-NC 490 390 20 0
E4916-NC 490 390 20 0
E4928-NC 490 390 20 0
E5716-NC 570 490 16 0
E5728-NC 570 490 16 0
E4903-CC 490 390 20 0
E4916-CC 490 390 20 0
E4928-CC 490 390 20 0
E5716-CC 570 490 16 0
E5728-CC 570 490 16 0
E4903-NCC 490 390 20 0
E4916-NCC 490 390 20 0
E4928-NCC 490 390 20 0
E5716-NCC 570 490 16 0
E5728-NCC 570 490 16 0
E4903-NCC1 490 390 20 0
E4916-NCC1 490 390 20 0
E4928-NCC1 490 390 20 0
E5516-NCC1 550 460 17 −20
E5518-NCC1 550 460 17 −20
E5716-NCC1 570 490 16 0
E5728-NCC1 570 490 16 0
E4916-NCC2 490 420 20 −20
E4918-NCC2 490 420 20 −20
E49XX-G 490 400 20 NR
E55XX-G 550 460 17 NR
E57XX-G 570 490 16 NR
a
Single values are minimum requirements.
b
NR = impact testing i
...