ISO 11951:2026

International
Standard
ISO 11951
Third edition
Cold-reduced tinmill products —
2026-04
Blackplate
Aciers pour emballage laminés à froid — Fer noir
Reference number
© ISO 2026
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Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General technical delivery condition . 3
5 Classification . 3
6 Information to be supplied by the purchaser . 3
6.1 Designation .3
6.2 Mandatory information .4
6.3 Options.4
7 Manufacturing features . 5
7.1 Manufacture.5
7.2 Annealing .5
7.3 Finish .5
7.4 Oiling .5
7.5 Imperfections .6
8 Mechanical properties . 6
8.1 General .6
8.2 Hardness requirement . .6
8.3 Tensile property requirement .6
9 Tolerances on dimensions and shape . 6
9.1 General .6
9.2 Thickness and feather edge .7
9.2.1 Coil thickness.7
9.2.2 Feather edge .7
9.3 Coil width .7
9.4 Coil length .7
9.5 Edge camber of trimmed coils .7
9.6 Flatness .8
9.6.1 Edge wave .8
9.6.2 Longitudinal and transverse bow .8
9.6.3 Centre fullness.8
10 Joint within a coil . 8
10.1 General .8
10.2 Number of joints .8
10.3 Location of joints .9
10.4 Dimension of joints .9
10.4.1 Thickness .9
10.4.2 Overlap .9
11 Sampling . 9
12 Test method . 10
12.1 Hardness test .10
12.1.1 Test piece .10
12.1.2 Test method .10
12.2 Tensile test .11
12.2.1 Test piece .11
12.2.2 Test method .11
12.3 Flatness test .11
12.3.1 General .11
12.3.2 Edge wave .11

iii
12.3.3 Longitudinal or transverse bow . 12
12.3.4 Centre fullness. 12
13 Retests .13
14 Inspection document . 14
15 Dispatch and packaging . 14
15.1 Coil orientation . .14
15.2 Labelling .14
Annex A (normative) Hardness requirements for blackplate .15
Annex B (normative) Tensile property requirements for blackplate .16
Annex C (informative) Steel types .18
Annex D (informative) Springback test for routine determination of R or R for blackplate . 19
p0,2 eL
Annex E (normative) Rockwell HR15Tm values and their HR30Tm equivalents .20
Bibliography .21

iv
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,
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
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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 17, Steel, Subcommittee SC 9, Tinplate and
blackplate.
This third edition cancels and replaces the second edition (ISO 11951:2016), which has been technically
revised.
The main changes are as follows:
— the Scope has been modified to clarify that blackplate is also used in other applications (beside electrolytic
tinplate and ECCS) (see Clause 1);
— the maximum nominal thickness for double cold-reduce tinplate has been changed to 0,390 mm, instead
of 0,360 mm (see Clause 1);
— several steel grades have been added (see Tables A.1, A.2 and B.1);
— the lower yield strength, R has specified for CA (see 8.3, 12.2.2, Annex B, Annex D).
eL
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.

v
International Standard ISO 11951:2026(en)
Cold-reduced tinmill products — Blackplate
1 Scope
This document specifies requirements for single and double cold-reduced blackplate in the form of coils
which are generally intended for manufacturing electrolytic tinplate or electrolytic chromium/chromium
[1] [2]
oxide-coated steel (ECCS) according to ISO 11949 or ISO 11950 .
This document applies to:
— single cold-reduced blackplate which is generally specified in nominal thicknesses that are multiples of
0,005 mm from 0,150 mm up to and including 0,600 mm;
— double cold-reduced blackplate which is generally specified in nominal thicknesses that are multiples of
0,005 mm, from 0,100 mm up to and including 0,390 mm.
1)
This document applies to coils in nominal minimum rolling widths of 600 mm with either trimmed or
untrimmed edges.
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 404, Steel and steel products — General technical delivery requirements
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 10474, Steel and steel products — Inspection documents
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
blackplate
cold-reduced low-carbon mild steel, normally oiled, for the production of electrolytic tinplate or ECCS in
accordance with ISO 11949 or ISO 11950
3.2
single cold-reduced
description of product in which the blackplate has been reduced to the desired thickness in a cold-reduction
mill and subsequently annealed and temper rolled
1) Nominal minimum rolling widths of 500 mm may be applied by agreement between the purchaser and the
manufacturer.
3.3
double cold-reduced
description of product in which the blackplate has had a second major reduction after annealing
3.4
batch annealing
box annealing
BA
process in which the cold-reduced strip is annealed in coil form, within a protective atmosphere, for a
predetermined time-temperature cycle
3.5
continuously annealing
CA
process in which cold-reduced coils are unwound and annealed in strip form within a protective atmosphere
3.6
finish
appearance of the surface of blackplate resulting from controlled preparation of the work rolls used for the
final stages of rolling
3.6.1
smooth finish
appearance resulting from the use of temper-mill work rolls that have been ground to a low roughness
Note 1 to entry: This finish is used for the production of bright finish tinplate or bright finish ECCS.
3.6.2
fine stone finish
appearance characterized by a directional pattern, resulting from the use of final mill work rolls that have
been ground to a lower level of roughness than those used for stone finish
3.6.3
stone finish
appearance characterized by a directional pattern, resulting from the use of final-mill work rolls that have
been ground to a higher level of roughness than those used for the smooth finish
3.6.4
matt finish
appearance resulting from the use of temper-mill work rolls with dull surface textured by shot blast, electro
discharge texturing (EDT), electron beam texturing (EBT) or another suitable method
3.7
coil
rolled flat strip product that is wound into regularly superimposed laps so as to form a coil with almost flat
sides
3.8
longitudinal bow
line bow
residual curvature in the strip remaining along the direction of rolling
3.9
transverse bow
cross bow
mode of curvature in the strip such that the distance between its edges parallel to the direction of rolling is
less than the strip width
3.10
centre fullness
centre buckle
full centre
intermittent vertical displacement or wave in the strip occurring other than at the edges
Note 1 to entry: See Figure 6.
3.11
edge wave
intermittent vertical displacement occurring at the strip edge when the strip is laid on a flat surface
Note 1 to entry: This parameter is only applicable to material supplied with trimmed edges.
3.12
feather edge
transverse thickness profile
variation in thickness characterized by a reduction in thickness close to the edges at right angles to the
direction of rolling
Note 1 to entry: This parameter is only applicable to material supplied with trimmed edges.
3.13
edge camber
deviation of edge of coil/sheet from a straight line forming its chord
3.14
rolling width
width of the rolled strip perpendicular to the direction of rolling
3.15
consignment
quantity of material of the same specification made available for dispatch at the same time
4 General technical delivery condition
In cases where the technical delivery condition is not specified in this document, then ISO 404 shall apply.
5 Classification
Steel grades for this document are generally classified as non-alloy quality steels.
6 Information to be supplied by the purchaser
6.1 Designation
For the purposes of this document, blackplate is designated in terms of a steel grade classification based
either on the Rockwell HR30Tm hardness values or on the tensile properties. For the hardness requirements,
the steel grade designations shall be in accordance with Annex A; specifically, steel grade designations are
given in Table A.1 for single cold-reduced blackplate and in Table A.2 for double cold-reduced blackplate. For
the tensile properties requirements, the steel grade designations shall be in accordance with Table B.1 of
Annex B.
Blackplate covered by this document shall be designated by the following characteristics in the given
sequence:
a) a reference to this document, i.e. ISO 11951;
b) the steel grade designation in accordance with Table A.1, Table A.2 or Table B.1;

c) the type of annealing used by the manufacturer (see 7.2);
d) the type of finish (see 7.3);
e) the dimensions of the thickness and width, in millimetres;
f) whether mill-edge or trimmed.
EXAMPLE
Single cold-reduced blackplate coil, in accordance with this document, steel grade T61, continuously annealing (CA),
stone finish, with a thickness of 0,220 mm and a width of 800 mm after trimmed, is designated:
ISO 11951 - T61CA - stone - 0,220 × 800 trimmed
Double cold-reduced blackplate coil, in accordance with this document, steel grade T75, continuously annealing (CA),
stone finish, with a thickness of 0,180 mm and a mill-edge width of 750 mm, is designated:
ISO 11951-T75CA - stone - 0,180 × 750 mill-edge
Blackplate coil, in accordance with this document, steel grade TH415, continuously annealing (CA), stone finish (ST),
with a thickness of 0,200 mm and a mill-edge width of 750 mm, is designated:
ISO 11951- TH415 CA - ST - 0,200 × 750 mill-edge
Blackplate coil, in accordance with this document, steel grade TS520, batch annealing (BA), stone finish, with a
thickness of 0,140 mm and a width of 844 mm after trimmed, is designated:
ISO 11951- TS520 BA - stone - 0,140 × 844 trimmed
6.2 Mandatory information
The following information shall be given in the enquiry and order to assist the manufacturer in supplying
the correct material:
a) the designation as given in 6.1;
b) the quantity, expressed on a mass basis, e.g. 50 000 kg of sheets, 100 000 kg of coils;
c) the minimum and the maximum coil weight, the minimum and the maximum coil outer diameter, the
coil internal diameter, the core vertical or horizontal, and the direction of winding (see 15.1);
d) whether or not the coil shall be supplied with the edges trimmed;
e) whether or not the coil shall be coated with a suitable oil.
f) other inspection documents than that specified by the manufacturer (see Clause 14);
NOTE Information on appropriate steel grade is suitable for shaping operations such as stamping, drawing,
folding, beading and bending, and assembly work such as joint forming and welding. The end use is important when
the steel grade is selected.
6.3 Options
When ordering, the purchaser shall supply all the necessary information concerning the following:
a) the production facilities which is anticipated to be appropriate to the ordered blackplate;
b) the intended end use.
7 Manufacturing features
7.1 Manufacture
Continuously cast, fully-killed steel shall be applied, except when otherwise specified. The examples of the
steel types of blackplate are shown in Annex C.
The steel type of blackplate shall be designed to secure food safety when blackplate is applied for food
application. The purchasers should be aware of existing national regulations which can impose limitations
on some elements.
The methods of man
...