ISO 11951:2016
(Main)Cold-reduced tinmill products — Blackplate
Cold-reduced tinmill products — Blackplate
ISO 11951:2016 specifies requirements for single and double cold-reduced blackplate in the form of coils which are intended for manufacturing electrolytic tinplate or electrolytic chromium/chromium oxide-coated steel (ECCS) in accordance with ISO 11949 or ISO 11950. Single cold-reduced blackplate 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 is generally specified in nominal thicknesses that are multiples of 0,005 mm, from 0,100 mm up to and including 0,360 mm. ISO 11951:2016 applies to coils in nominal minimum rolling widths of 600 mm[1] with either trimmed or untrimmed edges. [1] Nominal minimum rolling widths of 500 mm may be applied by agreement between the purchaser and the manufacturer.
Aciers pour emballage laminés à froid — Fer noir
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11951
Second edition
2016-03-01
Cold-reduced tinmill products —
Blackplate
Aciers pour emballage laminés à froid — Fer noir
Reference number
ISO 11951:2016(E)
©
ISO 2016
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ISO 11951:2016(E)
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© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved
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ISO 11951:2016(E)
Contents Page
Foreword .v
Introduction .vi
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 . 5
7 Manufacturing features . 5
7.1 Manufacture . 5
7.2 Annealing . 5
7.3 Finish . 5
7.4 Oiling . 6
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 . 7
9.1 General . 7
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 joint . 8
10.3 Location of joint . 9
10.4 Dimension of joint . 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
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ISO 11951:2016(E)
12.3.1 General.11
12.3.2 Edge wave .11
12.3.3 Longitudinal or transverse bow .11
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 proof strength
for blackplate .19
Annex E (normative) Rockwell HR15Tm values and their HR30Tm equivalents .20
Bibliography .21
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ISO 11951:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 9, Tinplate and
blackplate.
This second edition cancels and replaces the first edition (ISO 11951:1995), which has been technically
revised.
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ISO 11951:2016(E)
Introduction
Selling of packaging steels is today a worldwide business. Therefore, revision of this International
Standard was expected earlier since the last edition dated from 1995. Because of the long period
between revisions, harmonization became difficult. In some regions, the properties of the packaging
steels are determined by the hardness test whereas in other regions, a decade ago, the hardness
test was replaced by the tensile test. Since the latest available techniques should be reflected in this
International Standard, the possibility of using the tensile test as the reference test for determining the
mechanical properties should be considered during the next revision of this International Standard.
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INTERNATIONAL STANDARD ISO 11951:2016(E)
Cold-reduced tinmill products — Blackplate
1 Scope
This International Standard specifies requirements for single and double cold-reduced blackplate
in the form of coils which are intended for manufacturing electrolytic tinplate or electrolytic
chromium/chromium oxide-coated steel (ECCS) in accordance with ISO 11949 or ISO 11950.
Single cold-reduced blackplate 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 is generally
specified in nominal thicknesses that are multiples of 0,005 mm, from 0,100 mm up to and including
0,360 mm.
1)
This International Standard applies to coils in nominal minimum rolling widths of 600 mm with either
trimmed or untrimmed edges.
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.
ISO 404, Steel and steel products — General technical delivery requirements
ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
2)
ISO 6892-1:— , Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 10474, Steel and steel products — Inspection documents
ISO 11949, Cold-reduced tinmill products — Electrolytic tinplate
ISO 11950, Cold-reduced tinmill products — Electrolytic chromium/chromium oxide-coated steel
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
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.
2) To be published (Revision of ISO 6892-1:2009)
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ISO 11951:2016(E)
3.3
double cold-reduced
description of product in which the blackplate has had a second major reduction after annealing
3.4
batch annealed
box annealed
BA
annealed by the 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 annealed
CA
annealed by the 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
finish 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
stone finish
finish 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
3.6.3
matt finish
finish 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.
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ISO 11951:2016(E)
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
burr
metal displaced beyond the plane of the surface of the strip by shearing action
3.15
rolling width
width of the rolled strip perpendicular to the direction of rolling
3.16
consignment
quantity of material of the same specification made available for dispatch at the same time
3.17
pallet
base platform on which a coil is placed to facilitate ready transportation
3.18
anvil effect
effect that a hard anvil can produce on the numerical hardness value obtained when a hardness test is
performed on very thin material supported on such an anvil
4 General technical delivery condition
In cases where the technical delivery condition is not specified in this International Standard, then
ISO 404 shall apply.
5 Classification
Steel grades for this International Standard are generally classified as non-alloy quality steels.
6 Information to be supplied by the purchaser
6.1 Designation
For the purposes of this International Standard, 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 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 are given in Table B.1.
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ISO 11951:2016(E)
Blackplate covered by this International Standard shall be designated by the following characteristics
in the given sequence:
a) a reference to this International Standard, 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 International Standard, steel grade T61, continuously
annealed (CA), stone finish, with a thickness of 0,220 mm and a width of 800 mm after trimmed, shall be
designated.
ISO 11951 - T61 CA - stone - 0,220 × 800 trimmed
Double cold-reduced blackplate coil, in accordance with this International Standard, steel grade T75, continuously
annealed (CA), stone finish, with a thickness of 0,180 mm and a mill-edge width of 750 mm, shall be designated.
ISO 11951 - T75 CA - stone - 0,180 × 750 mill-edge
Blackplate coil, in accordance with this International Standard, steel grade TH415, continuously annealed (CA),
stone finish (ST), with a thickness of 0,200 mm and a mill-edge width of 750 mm, shall be designated.
ISO 11951 - TH415 CA - ST - 0,200 × 750 mill-edge
Blackplate coil, in accordance with this International Standard, steel grade TS520, batch annealed (BA), stone
finish, with a thickness of 0,140 mm and a width of 844 mm after trimmed, shall be 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 tons of sheets, 100 tons 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 document than that specified by the manufacturer (see Clause 14);
NOTE 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.
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ISO 11951:2016(E)
6.3 Options
When ordering, the purchaser shall supply all the necessary information concerning the following:
a) the production facilities which he/she anticipates will 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 may impose
limitations on some elements.
The methods of manufacture of blackplate are the province of the manufacturer and are not specified
in this International Standard.
NOTE It is recommended that the manufacturer supplies to the purchaser such details of the manufacturing
process so as to assist the purchaser in his/her efficient use of the blackplate.
7.2 Annealing
Annealing of blackplate shall be either batch annealing (BA) or continuous annealing (CA) and shall be
specified by the purchaser at the time of enquiry and order.
7.3 Finish
Blackplate is usually available in the finishes as indicated in Table 1. The type of finish is designated
either by the blackplate finish or the code shown in Table 1.
Table 1 — Typical finishes for blackplate
b, c
Surface roughness
a
Finish Code Ra
µm
Smooth BT ≤0,35
Fine stone FS 0,25 – 0,45
Stone ST 0,35 – 0,60
Matt MM ≥0,90
NOTE Double cold-reduced blackplate is usually supplied
with a stone finish.
a
By agreement between the purchaser and the
manufacturer, another code system may be applied.
b
Values of surface roughness in this table are not mandatory.
The values are given for reference in order to classify the
finishes.
c
The measurement of surface roughness is in accordance
with ISO 4288.
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ISO 11951:2016(E)
7.4 Oiling
To avoid corrosion, blackplate shall normally be supplied with a sufficient layer of a suitable, non-
mineral, protective oil. The oil shall be removed by an adequate inline cleaning process before any
subsequent coating.
When blackplate is required without an oil coating, this shall be indicated at the time of ordering.
NOTE When unoiled blackplate is supplied, there is an increased risk of surface corrosion.
7.5 Imperfections
The production of blackplate coils in continuous-strip mill operations does not afford the opportunity
for removal of all blackplate that does not comply with the requirements of this International Standard.
However, the manufacturer has to ensure that in coils complying with this International Standard, at
least 90 % of the coil can be used for producing electrolytic tinplate or chromium/chromium oxide
coated steel sheet which is
a) free from surface imperfections which render the material unsuitable for the intended use,
b) free from damage which render the material unsuitable for intended use, and
c) compliant with the requirements as specified in this International Standard.
The purchaser is expected to have adequate handling and roller levelling equipment and inspection
facilities and to take reasonable care during these operations.
8 Mechanical properties
8.1 General
For the purposes of this International Standard, blackplates are classified into steel grades based
on either Rockwell HR30Tm hardness values or tensile properties. The purchaser shall indicate the
specification either by hardness requirement or by tensile properties requirement, but not for both
when ordering the material.
When ordering the material for
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11951
ISO/TC 17/SC 9 Secretariat: JISC
Voting begins on: Voting terminates on:
2014-01-09 2014-04-09
Cold-reduced blackplate in coil form for the production of
tinplate or electrolytic chromium/chromium oxide-coated
steel
Fer noir laminé à froid en bobines destiné à la fabrication de fer-blanc ou de fer chromé électrolytique
[Revision of first edition (ISO 11951:1995)]
ICS: 77.140.50
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11951:2013(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2013
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ISO/DIS 11951:2013(E)
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
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Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved
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ISO/DIS 11951:2013
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Definitions . 2
4 Classification . 3
5 Information to be supplied by the purchaser . 3
5.1 Designation . 3
5.2 Mandatory information. 4
5.3 Options . 4
6 Manufacturing features . 5
6.1 Manufacture . 5
6.2 Annealing . 5
6.3 Finish . 5
6.4 Oiling. 5
6.5 Imperfections . 6
7 Mechanical properties. 6
7.1 General . 6
7.2 Hardness requirement . 6
7.3 Tensile property requirement . 6
8 Tolerances on dimensions and shape . 6
8.1 General . 6
8.2 Thickness and feather edge . 7
8.3 Coil width . 7
8.4 Coil length . 7
8.5 Edge camber of trimmed coils . 7
8.6 Flatness . 8
9 Joints within a coil . 9
9.1 General . 9
9.2 Number of joints . 9
9.3 Location of joints . 9
9.4 Dimensions of joints . 9
10 Sampling . 10
11 Test methods . 10
11.1 Hardness tests . 10
11.2 Tensile tests . 11
11.3 Flatness tests . 11
12 Retests . 14
13 Inspection document . 14
14 Dispatch and packaging . 14
14.1 Coil orientation . 14
14.2 Labeling . 15
Annex A (normative) Hardness requirements for blackplate . 16
Annex B (normative) Tensile property requirements for blackplate . 17
Annex C (Informative) Steel types . 18
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ISO/DIS 11951:2013
Annex D (normative) Springback test for routine determination of proof strength for blackplate . 19
Annex E (normative) Rockwell HR15Tm values and their HR30Tm equivalents . 20
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ISO/DIS 11951:2013
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO/DIS 11951:2013 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 9, Tinplate
and blackplate.
© ISO 2013 – All rights reserved v
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DRAFT INTERNATIONAL STADARD ISO/DIS 11951:2013
Cold-reduced blackplate in coil form for the production of
electrolytic tinplate or electrolytic chromium/chromium oxide-
coated steel
1 Scope
This International Standard specifies requirements for single and double cold-reduced blackplate in the form
of coils which are intended for manufacturing electrolytic tinplate or electrolytic chromium/chromium oxide-
coated steel (ECCS) in accordance with ISO 11949 or ISO 11950.
In general, single cold-reduced blackplate is specified in nominal thicknesses that are multiples of 0,005 mm,
from 0,15 mm up to and including 0,60 mm. Double cold-reduced blackplate is specified in nominal
thicknesses that are multiples of 0,005 mm, from 0,10 mm up to and including 0,36 mm.
1)
This International Standard applies to coils in nominal minimum rolling widths of 600 mm , with either trimmed
or untrimmed edges.
In addition, the general technical delivery requirements of ISO 404 are applicable.
2 Normative references
The following referenced documents are indispensable for the application of this International Standard. 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 condition
ISO 4288, Geometrical Product Specifications (GPS) – Surface texture : Profile method – Rule and
procedures for the assessment of surface texture
ISO 6508-1:2005, Metallic materials –Rockwell hardness test – Part 1:Test method (scales A, B, C, D, E, F, G,
H, K, N, T).
ISO 6892-1:2009, Metallic materials -Tensile testing – Part 1:Method of test at room temperature.
ISO/TR 9769, Steel and iron – Review of available methods of analysis
ISO 10474, Steel and steel products – Inspection documents
ISO 11949, Cold-reduced electrolytic tinplate.
ISO 11950, Cold-reduced electrolytic chromium/chromium oxide-coated steel.
1) Nominal minimum rolling widths of 500 mm may be applied by agreement between the purchaser and the
manufacturer.
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ISO/DIS 11951:2013
3 Definitions
For the purposes of this International Standard, the following definitions apply.
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:
term used to describe blackplate which has been reduced to the desired thickness in a cold-reduction mill and
subsequently annealed and temper rolled.
3.3
double cold-reduced
term used to describe blackplate which has had a second major reduction after annealing.
3.4
batch annealed; box annealed (BA)
annealed by the 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 annealed (CA)
annealed by the 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
matt finish
finish resulting from the use of temper-mill work rolls with dull surface textured by Shot Blast, EDT(Electro
Discharge Texturing), EBT (Electron Beam Texturing) and so on,
3.6.2
smooth finish
finish resulting from the use of temper-mill work rolls that have been ground to a low roughness. This finish is
used for the production of bright finish tinplate or smooth finish ECCS.
3.6.3
stone finish
finish 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.
3.7
coil
rolled flat strip product which 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.
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ISO/DIS 11951:2013
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 (see Figure 6).
3.11
edge wave
intermittent vertical displacement occurring at the strip edge when the strip is laid on a flat surface. 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. This parameter is only applicable to material supplied with trimmed edges.
3.14
Edge camber
deviation of edge of coil from a straight line forming its chord.
3.15
burr
metal displaced beyond the plane of the surface of the strip by shearing action.
3.16
rolling width
width of the rolled strip perpendicular to the direction of rolling.
3.17
consignment
quantity of material of the same specification made available for dispatch at the same time.
3.18
pallet
base platform on which a coil is placed to facilitate ready transportation.
3.19
anvil effect
effect which a hard anvil can produce on the numerical hardness value obtained when a hardness test is
performed on very thin material supported on such an anvil.
4 Classification
Steel grades for this International Standard are generally classified as non-alloy quality steels.
5 Information to be supplied by the purchaser
5.1 Designation
For the purposes of this International Standard, 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 requirement, the steel grade designations are given in Table A.1 for single cold-reduced blackplate
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ISO/DIS 11951:2013
and in Table A.2 for double cold-reduced blackplate. For the tensile properties requirement, the steel grade
designations are given in Table B.1.
Blackplate covered by this International Standard shall be designated by the following characteristics in the
given sequence:
a) the number of this International Standard;
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 6.2);
d) the type of finish (see 6.3);
e) the dimensions of the thickness and width, in millimetres;
f) whether mill-edge or trimmed.
EXAMPLE
ISO 11951 - T61 - CA - stone - 0,22 x 800 trimmed
ISO 11951 - T75 - CA - stone - 0,18 x 750 mill-edge
ISO 11951 - TH415 - CA - ST - 0,20 x 750 mill-edge
ISO 11951 - TS520 - BA - stone - 0,14 x 844 trimmed
5.2 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 5.1
b) the quantity, expressed on a mass basis;
c) the orientation of the coils on delivery, i.e. with the cores vertical or horizontal (see 14.1);
d) whether the coil shall be supplied with the edges trimmed or not.
e) whether the coil shall be coated with a suitable oil or not.
NOTE Appropriate classifications are suitable for shaping operations such as stamping, drawing, folding, beading
and bending, and assembly work such as joint forming and welding. The end use should be borne in mind when the
classification is selected.
5.3 Options
When ordering, the purchaser shall supply all the necessary information concerning
a) his production facilities which he anticipates will be appropriate to the ordered blackplate;
b) the intended end use.
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ISO/DIS 11951:2013
6 Manufacturing features
6.1 Manufacture
Continuously cast, fully-killed steel is 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 if blackplate is applied for food application.
The purchasers should be aware of existing national regulations which may impose limitations on some
elements.
The methods of manufacture of blackplate are the province of the manufacturer and are not specified in this
International Standard.
NOTE It is recommended that the manufacturer supplies to the purchaser such details of the manufacturing process
as may assist the purchaser in his efficient use of the blackplate.
6.2 Annealing
Annealing of blackplate shall be either batch annealing (BA) or continuous annealing(CA), and shall be
specified by the purchaser at the time of enquiry and order.
6.3 Finish
Blackplate is usually available in the finishes as indicated in Table 1.
Table 1 — Typical finishes for blackplate
a) b)
Finish Code Surface roughness
Ra µm
Smooth ≤0,35
Fine stone FS 0,25 – 0,45
Stone ST
0,35 – 0,60
Matt MM ≥ 0,90
a)
By agreement between the purchaser and the
manufacture, another code system may be applied.
b)
Values of surface roughness in this table are not
normative. The values are reference to classify the finishes.
NOTE 1 Double cold-reduced blackplate is usually supplied with a stone finish.
NOTE 2 For guidance on the measurement of surface roughness, refer to ISO 4288.
6.4 Oiling
To avoid corrosion, blackplate shall normally be supplied with a sufficient layer of a suitable, non-mineral,
protective oil. The oil shall be removed by an adequate inline cleaning process before any subsequent coating.
If blackplate is required without an oil coating, this shall be indicated at the time of ordering.
NOTE If unoiled blackplate is supplied, there is an increased risk of surface corrosion.
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ISO/DIS 11951:2013
6.5 Imperfections
The production of blackplate coils in continuous-strip mill operations does not afford the opportunity for
removal of all blackplate that does not comply with the requirements of this International Standard.
However the manufacturer has to ensure that in coils complying to this International Standard at least 90% of
the coil can be used for producing electrolytic tinplate or chromium / chromium oxide coated steel sheets
which is :
a) free from surface imperfections which render the material unsuitable for the intended use
b) free from damage which render the material unsuitable for intended use
c) compliant to the requirements as specified in this International Standard
The purchaser is expected to have adequate handling and roller levelling equipment and inspection facilities,
and to take reasonable care during these operations.
7 Mechanical properties
7.1 General
For the purposes of this International Standard, blackplates are classified into steel grades based on either
Rockwell HR30Tm hardness values or tensile properties. The purchaser shall indicate the specification either
by hardness requirement or by tensile properties requirement, but not for both, when ordering the material.
Other mechanical properties may significantly influence the performance of blackplate in processing, and the
subsequent intended end use may vary depending on the steel type and the methods of casting, annealing
and temper rolling employed.
At the time of enquiry and order it shall be agreed that properties of steel grade are to be verified either by the
tensile test or by the hardness test.
7.2 Hardness requirement
The hardness values for blackplate shall be as given in Table A.1 and Table A.2, when tested as described in
11.1.
7.3 Tensile property requirement
The proof strength (R ) for blackplate shall be as given in Table B.1 , when tested as described in 11.2.
p0,2
For routine testing, the proof strength may be determined using the springback test as described in Annex D.
However, in cases of dispute, the method described in 11.2 shall be used.
8 Tolerances on dimensions and shape
8.1 General
Tolerances on dimensions (i.e. thickness, width and length) and shape (i.e. edge camber and flatness) are
specified in 8.2 to 8.6, together with appropriate methods of measurement.
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ISO/DIS 11951:2013
8.2 Thickness and feather edge
8.2.1 Coil thickness
Nominal thickness shall be a multiple of 0,005 mm. Nominal thickness other than multiple of 0,005 mm may
be specified by agreement between the purchaser and the manufacturer. Thickness out of the nominal
thickness range may be specified by agreement between the purchaser and the manufacturer.
The thickness of blackplate shall not deviate from the ordered nominal thickness by more than +5,-8% at any
point except within 10mm from the edge.
The thickness shall be measured using a hand-operated, spring-loaded micrometer to an accuracy of 0,001
mm.
NOTE It is recommended that the micrometer should have a ball-ended shank and a curved-surface base anvil.
8.2.2 Feather edge
The thickness when measured at a distance of 10 mm from the mill trimmed edge shall not deviate from the
actual centre thickness by more than -6 %
8.3 Coil width
The width of the coil shalI be measured to the nearest 0,5 mm, at right angles to the direction of rolling.
For trimmed-edge product, the measured width shall not deviate from the ordered width by more than +3, -0
mm. For mill-edge product, the measured width shall not deviate from the ordered width by more than +10, -0
mm.
8.4 Coil length
The difference between the actual length and the manufacturer’s indicated length, measured on any single
coil, shall not exceed by more than ± 3 %.
8.5 Edge camber of trimmed coils
Edge camber is the maximum deviation (in the plane of the sheet) of an edge from a straight line forming a
chord to its extremities (see Figure 1).
The edge camber, E, expressed as a percentage of the chord length, is calculated using the following
formula:
D
E = x 100
L
where
D is the deviation from a straight line, in millimetres
L is the length of chord, in millimetres
The edge camber, measured over a distance (chord length) of 1 m, shall not exceed 0,1 % (i.e. 1 mm).
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ISO/DIS 11951:2013
1m
Key
W rolling width
D deviation from a straight line
Figure 1 – Edge camber
8.6 Flatness
8.6.1 Edge wave
The height of edge wave (h ) at any point shall not exceed 2,5 mm, when tested as described in 11.3.2. No
ew
more than six waves in excess of 1,5 mm shall be present over a cut length of 1 m for coil.
8.6.2 Longitudinal and transverse bow
Bow may be either convex or concave face uppermost on the bulk package. The normal convention is to
express convex bow uppermost as a positive (+) value and concave bow as a negative (-) value.
The individual values of both longitudinal and transverse bow in levelled condition shall not exceed 30 mm,
when tested as described in 11.3.3. Where both convex and concave bow are present in the same coil, the
sum of the maximum values of each, ignoring the sign (+/-), shall not exceed 30 mm. In case of unlevelled
sheet from coil before cutting, the requirement of bow may be agreed between the purchaser and the
manufacturer.
8.6.3 Centre fullness
Centre fullness shall be determined by either the direct method as described in 11.3.4.1 or the indirect method
as described in 11.3.4.2. The selection of the method is at discretion of the manufacturer. In case of the direct
method, the height of centre fullness (h ) shall not exceed 5 mm when tested as described in 11.3.4.1. In case
cf
of the indirect method, the height of centre fullness (h) shall not exceed 9 mm when tested as described in
11.3.4.2.
NOTE Centre fullness is not clearly visible in a coil but usually becomes apparent during either printing or slitting.
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ISO/DIS 11951:2013
9 Joints within a coil
9.1 General
The manufacturer shall ensure continuity of the coils within the limits of the lengths ordered, if necessary by
means of electrically welded joints made after cold reduction. Requirements relating to the numbers, locations
and dimensions of the joints permitted within a coil are given in 9.2 to 9.4.
9.2 Number of joints
The number of joints in a coil shall not exceed three in lengths of 10 000 m.
9.3 Location of joints
The location of each joint in a coil shall be indicated clearly.
NOTE The location of each joint may be indicated, for example by the insertion of a piece of non-rigid material and
punched holes. However, alternative methods may be agreed between the purchaser and the manufacturer at the time of
enquiry and order.
9.4 Dimensions of joints
9.4.1 Thickness
The total thickness of any joint shall not exceed three times the nominal thickness of the material forming the
joint.
9.4.2 Overlap
In any lap joint, the total length of overlap shall not exceed 10 mm. The free overlap shall not exceed 5 mm
(see Figure 2).
KEY
a total length of overlap
b free overlap
Figure 2 – Joint overlap
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ISO/DIS 11951:2013
10 Sampling
For certifying the quality of product, the manufacturer shall take samples according to Figure 3 and carry out
test. One sheet for test specimen shall be taken for every 30 tons or less and remainder thereof of the same
properties, ie. steel grade and dimensions.
Key
Y test pieces for hardness
Z test pieces for tensile or springback tests
Figure 3 – Location of test pieces
11 Test methods
11.1 Hardness tests
11.1.1 Test pieces
From each of the sample sheets obtained in accordance with clause 10, take two test pieces from the
positions marked Y in Figure 3.
Before carrying out the hardness tests in accordance with11.1.2, artificially age the test pieces at 200 ℃ for 20
min. The artificial aging may not be necessary for non-aging materials.
When necessary, the surface shall be finished with fine emery paper.
11.1.2 Test method
Determine the Rockwell HR30Tm indentation hardness either
a) directly, in accordance with ISO 6508-1; or
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ISO/DIS 11951:2013
b) indirectly, on relatively thin sheets (e.g. 0,22 mm and thinner), by determining
...
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