ISO 11950:2016
(Main)Cold-reduced tinmill products — Electrolytic chromium/chromium oxide-coated steel
Cold-reduced tinmill products — Electrolytic chromium/chromium oxide-coated steel
ISO 11950:2016 specifies requirements for single and double cold-reduced electrolytic chromium/chromium oxide-coated steel (ECCS) in the form of sheets or coils. Single cold-reduced ECCS 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 ECCS 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 11950:2016 applies to coils and sheets cut from coils in nominal minimum rolling widths of 600 mm[1]. [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 chromé électrolytique
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11950
Second edition
2016-03-01
Cold-reduced tinmill products —
Electrolytic chromium/chromium
oxide-coated steel
Aciers pour emballage laminés à froid — Fer chromé électrolytique
Reference number
ISO 11950:2016(E)
©
ISO 2016
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ISO 11950:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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ISO 11950:2016(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General technical delivery condition . 4
5 Classification . 4
6 Information to be supplied by the purchaser. 4
6.1 Designation . 4
6.2 Mandatory information . 5
6.3 Options . 5
7 Manufacturing features . 6
7.1 Manufacture . 6
7.2 Annealing . 6
7.3 Finish . 6
7.4 Oiling . 6
7.5 Imperfections . 7
7.5.1 Coils . 7
7.5.2 Sheets . . . 7
8 Chromium/chromium in oxide coating mass . 7
9 Mechanical properties . 7
9.1 General . 7
9.2 Hardness requirement . 8
9.3 Tensile property requirement . 8
10 Tolerances on dimensions and shape . 8
10.1 General . 8
10.2 Thickness and feather edge . 8
10.2.1 Thickness . 8
10.2.2 Feather edge . 8
10.3 Width . 8
10.4 Length . 9
10.4.1 Length of coil . 9
10.4.2 Length of sheet . 9
10.5 Edge camber . 9
10.6 Out-of-squareness of sheet .10
10.7 Flatness .11
10.7.1 Edge wave .11
10.7.2 Longitudinal and transverse bow .11
10.7.3 Centre fullness .11
11 Joint within a coil .11
11.1 General .11
11.2 Number of joint .11
11.3 Location of joint .11
11.4 Dimension of joint .11
11.4.1 Thickness .11
11.4.2 Overlap .12
12 Sampling .12
13 Test method .12
13.1 Chromium/chromium in oxide coating mass .12
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ISO 11950:2016(E)
13.1.1 Test piece .12
13.1.2 Method of determination .13
13.2 Hardness test .13
13.2.1 Test piece .13
13.2.2 Test method .13
13.3 Tensile test .14
13.3.1 Test piece .14
13.3.2 Test method .14
13.4 Flatness test .14
13.4.1 General.14
13.4.2 Edge wave .14
13.4.3 Longitudinal or transverse bow .15
13.4.4 Centre fullness .15
14 Retests .17
15 Inspection document .17
16 Dispatch and packaging .17
16.1 Coils .17
16.2 Sheets .18
16.3 Labelling .18
Annex A (normative) Hardness requirements for ECCS .19
Annex B (normative) Tensile property requirements for ECCS .20
Annex C (informative) Steel types .22
Annex D (informative) Springback test for routine determination of proof strength for ECCS .23
Annex E (normative) Methods for the determination of metallic chromium and chromium
in the oxides on the surface of electrolytic chromium/chromium oxide-coated steel .24
Annex F (normative) Rockwell HR15Tm values and their HR30Tm equivalents .30
Bibliography .31
iv © ISO 2016 – All rights reserved
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ISO 11950:2016(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 11950:1995), which has been technically
revised.
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ISO 11950:2016(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.
vi © ISO 2016 – All rights reserved
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INTERNATIONAL STANDARD ISO 11950:2016(E)
Cold-reduced tinmill products — Electrolytic chromium/
chromium oxide-coated steel
1 Scope
This International Standard specifies requirements for single and double cold-reduced electrolytic
chromium/chromium oxide-coated steel (ECCS) in the form of sheets or coils.
Single cold-reduced ECCS 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 ECCS is generally specified in
nominal thicknesses that are multiples of 0,005 mm, from 0,100 mm up to and including 0,360 mm.
This International Standard applies to coils and sheets cut from coils in nominal minimum rolling
1)
widths of 600 mm .
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
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, applied for manufacturing ECCS
[1]
Note 1 to entry: See ISO 11951.
3.2
electrolytic chromium/chromium oxide-coated steel
ECCS
cold-reduced low-carbon mild steel sheet or coil, electrolytically treated to produce on both surfaces a
duplex film of metallic chromium adjacent to the steel substrate with a top layer of hydrated chromium
oxide or hydroxide
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 11950:2016(E)
3.3
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
3.4
double cold-reduced
description of product in which the blackplate has had a second major reduction after annealing
3.5
standard grade ECCS sheet
product in sheet form which is confirmed to be suitable, under normal conditions of storage, for
established lacquering and printing over the entire sheet and is
a) free from surface imperfections which render the material unsuitable for the intended use, and
b) free from damage which render the material unsuitable for the intended use
Note 1 to entry: The standard material is compliant with the requirements as specified in this International
Standard.
3.6
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
3.7
continuously annealed
CA
annealed by the process in which cold-reduced coils are unwound and annealed in strip form within a
protective atmosphere
3.8
finish
appearance of the surface of ECCS, governed by the surface roughness, Ra, of the steel base which
results from controlled preparation of the work rolls during the final stages of rolling
3.8.1
smooth finish
finish of blackplate 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 ECCS.
3.8.2
bright finish
finish on ECCS using the smooth finish blackplate
3.8.3
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
3.8.4
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
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ISO 11950:2016(E)
3.9
coil
rolled flat strip product which is wound into regularly superimposed laps so as to form a coil with
almost flat sides
3.10
longitudinal bow
line bow
residual curvature in the strip remaining along the direction of rolling
3.11
transverse bow
cross bow
mode of curvature in the sheet such that the distance between its edges parallel to the direction of
rolling is less than the sheet width
3.12
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 8.
3.13
edge wave
intermittent vertical displacement occurring at the strip edge when the strip is laid on a flat surface
3.14
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
3.15
edge camber
deviation of edge of coil/sheet from a straight line forming its chord
3.16
burr
metal displaced beyond the plane of the surface of the strip by shearing action
3.17
rolling width
width of the rolled strip perpendicular to the direction of rolling
3.18
pallet
base platform on which a coil is placed to facilitate ready transportation
3.19
stillage platform
base platform on which sheets are stacked to facilitate packing and ready transportation
3.20
consignment
quantity of material of the same specification made available for dispatch at the same time
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ISO 11950:2016(E)
3.21
bulk package
bulk
packaging unit comprising a stillage platform, the sheets and packaging material
3.22
line inspection
final inspection of the finished product performed by instruments and/or visual examination at normal
production-line speeds
3.23
anvil effect
effect that a hard anvil can produce on the numerical hardness value obtained when a hardness test is
performed on very thin sheet 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, ECCS 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
ECCS and in Table A.2 for double cold-reduced ECCS. For the tensile properties requirements, the steel
grade designations are given in Table B.1.
ECCS 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 11950;
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, in millimetres:
— for coils, thickness × width;
— for sheets, thickness × width × length.
By agreement, the symbol “× C” after width may be designated for coils.
By agreement, the symbol “w” may be designated after the number for the width to indicate that the
number is the dimension perpendicular to the direction of rolling.
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ISO 11950:2016(E)
EXAMPLE
Single cold-reduced ECCS sheet, in accordance with this International Standard, steel grade T61, continuously
annealed (CA), stone finish, with a thickness of 0,220 mm, a width of 800 mm and a length of 900 mm shall be
designated:
ISO 11950 - T61 CA - stone - 0,220 × 800 × 900
Double cold-reduced ECCS coil, in accordance with this International Standard, steel grade T75, continuously
annealed (CA), stone finish, with a thickness of 0,180 mm and a width of 750 mm shall be designated:
ISO 11950 - T75 CA - stone - 0,180 × 750
ECCS coil, in accordance with this International Standard, steel grade TH415, continuously annealed (CA), stone
finish (ST), with a thickness of 0,200 mm, a width of 750 mm shall be designated:
ISO 11950 - TH415 CA - ST - 0,200 × 750 × C
ECCS sheet, in accordance with this International Standard, steel grade TS520, batch annealed (BA), stone finish,
with a thickness of 0,140 mm, a dimension perpendicular to the direction of rolling of 844 mm and a length of
755 mm shall be designated:
ISO 11950 - TS520 BA - stone - 0,140 × 844w × 755
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 an area or 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 16.1);
d) the maximum weight of bulk package;
e) other inspection document than that specified by the manufacturer (see Clause 15);
f) end use;
g) any further special requirements.
NOTE Appropriate steel grade is suitable for shaping operations such as stamping, drawing, folding, beading
and bending and assembly work such as joint forming, soldering and welding. The end use is important when the
steel grade is selected.
6.3 Options
In addition to the information in 6.2, the purchaser may wish to provide additional information to the
manufacturer to ensure that the order requirements are consistent with the end use of the product.
The purchaser shall inform the manufacturer of any modifications to his/her fabrication operations
that will significantly affect the way in which the ECCS is used.
NOTE When ordering cold-reduced ECCS, the purpose of manufacture for which the material is intended is
generally stated. When double cold-reduced ECCS is used for built-up can bodies, the rolling direction is around
the circumference of the can so as to minimize the hazard of flange cracking. In such cases, the d
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11950
ISO/TC 17/SC 9 Secretariat: JISC
Voting begins on: Voting terminates on:
2014-01-09 2014-04-09
Cold-reduced electrolytic chromium/chromium oxide-
coated steel
Fer chromé électrolytique laminé à froid
[Revision of first edition (ISO 11950:1995)]
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 11950:2013(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 11950:2013(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
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
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 11950:2013
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Definitions . 1
4 Classification . 4
5 Information to be supplied by the purchaser . 4
5.1 Designation . 4
5.2 Mandatory information. 5
5.3 Options . 5
6 Manufacturing features . 5
6.1 Manufacture . 5
6.2 Annealing . 5
6.3 Finish . 5
6.4 Oiling. 6
6.5 Imperfections . 6
7 Chromium/chromium in oxide coating mass . 7
8 Mechanical properties. 7
8.1 General . 7
8.2 Hardness requirement . 7
8.3 Tensile property requirement . 7
9 Tolerances on dimensions and shape . 8
9.1 General . 8
9.2 Thickness and feather edge . 8
9.3 Width . 8
9.4 Length . 8
9.5 Edge camber . 8
9.6 Out-of-squareness of sheets . 10
9.7 Flatness . 10
10 Joints within a coil . 11
10.1 General . 11
10.2 Number of joints . 11
10.3 Location of joints . 11
10.4 Dimensions of joints . 11
11 Sampling . 12
12 Test methods . 12
12.1 Chromium/chromium in oxide coating mass . 12
12.2 Hardness tests . 13
12.3 Tensile tests . 14
12.4 Flatness tests . 14
13 Retests . 17
14 Inspection document . 17
15 Dispatch and packaging . 17
15.1 Coils . 17
15.2 Sheets . 17
15.3 Labeling . 18
© ISO 2013 – All rights reserved iii
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ISO/DIS 11950:2013
Annex A (normative) Hardness requirements for ECCS . 19
Annex B (normative) Tensile property requirements for ECCS . 20
Annex C (Informative) Steel types . 21
Annex D (normative) Springback test for routine determination of proof strength for ECCS . 22
Annex E (normative) Methods for the determination of metallic chromium and chromium in the
oxides on the surface of electrolytic chromium/chromium oxide-coated steel . 23
Annex F (normative) Rockwell HR15Tm values and their HR30Tm equivalents . 29
iv © ISO 2013 – All rights reserved
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ISO/DIS 11950:2013
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 11950:2013 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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ISO/DIS 11950:2013
vi © ISO 2013 – All rights reserved
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DRAFT INTERNATIONAL STADARD ISO/DIS 11950:2013
Cold-reduced electrolytic chromium/chromium oxide-coated
steel
1 Scope
This International Standard specifies requirements for single and double cold-reduced electrolytic
chromium/chromium oxide-coated steel (ECCS) in the form of sheets or coils.
In general, single cold-reduced ECCS 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 ECCS is specified in nominal thicknesses that
are multiples of 0,005 mm, from 0,10 mm up to and including 0,36 mm.
This International Standard applies to coils and sheets cut from coils in nominal minimum rolling widths of 600
1)
mm .
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 11951, Cold-reduced blackplate in coil form for the production of electrolytic tinplate or electrolytic
chromium / chromium oxide-coated steel
3 Definitions
For the purposes of this International Standard, the following definitions apply:
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 11950:2013
3.1
blackplate
Cold-reduced low-carbon mild steel, applied for manufacturing ECCS (refer to ISO 11951)
3.2
electrolytic chromium/chromium oxide-coated steel (ECCS)
cold-reduced low-carbon mild steel sheet or coil, electrolytically treated to produce on both surfaces a duplex
film of metallic chromium adjacent to the steel substrate with a top layer of hydrated chromium oxide or
hydroxide .
3.3
single cold-reduced
term used to describe those products in which the blackplate has been reduced to the desired thickness in a
cold-reduction mill and subsequently annealed and temper rolled.
3.4
double cold-reduced
term used to describe those products in which the blackplate has had a second major reduction after
annealing.
3.5
standard grade ECCS sheet
material in sheet form which is the product of line inspection. It is suitable, under normal conditions of storage,
for established lacquering and printing over the entire sheet and 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 the intended use;
c) compliant to the requirements as specified in this International Standard.
3.6
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.
3.7
continuously annealed (CA)
annealed by the process in which cold-reduced coils are unwound and annealed in strip form within a
protective atmosphere.
3.8
finish
appearance of the surface of ECCS, governed by the surface roughness (Ra) of the steel base which result
from controlled preparation of the work rolls during the final stages of rolling.
3.8.1
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,
3.8.2
smooth finish
finish resulting from the use of temper-mill work rolls that have been ground to a low roughness.
3.8.3
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.
2 © ISO 2013 – All rights reserved
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ISO/DIS 11950:2013
3.9
coil
rolled flat strip product which is wound into regularly superimposed laps so as to form a coil with almost flat
sides.
3.10
longitudinal bow; line bow
residual curvature in the strip remaining along the direction of rolling.
3.11
transverse bow; cross bow
mode of curvature in the sheet such that the distance between its edges parallel to the direction of rolling is
less than the sheet width.
3.12
centre fullness; centre buckle, full centre
intermittent vertical displacement or wave in the strip occurring other than at the edges (see Figure 8).
3.13
edge wave
intermittent vertical displacement occurring at the strip edge when the strip is laid on a flat surface.
3.14
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.
3.15
Edge camber
deviation of edge of coil from a straight line forming its chord.
3.16
burr
metal displaced beyond the plane of the surface of the strip by shearing action.
3.17
rolling width
width of the rolled strip perpendicular to the direction of rolling.
3.18
pallet
base platform on which a coil is placed to facilitate ready transportation.
3.19
stillage platform
base platform on which sheets are stacked to facilitate packing and ready transportation.
3.20
consignment
quantity of material of the same specification made available for dispatch at the same time.
3.21
bulk package; bulk
packaging unit comprising a stillage platform, the sheets and packaging material. (See pallet.)
3.22
line inspection
final inspection of the finished product performed by instruments and/or visual examination at normal
production-line speeds.
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ISO/DIS 11950:2013
3.23
anvil effect
effect which a hard anvil can produce on the numerical hardness value obtained when a hardness test is
performed on very thin sheet 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, ECCS 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 ECCS and in Table
A.2 for double cold-reduced ECCS. For the tensile properties requirement, the steel grade designations are
given in Table B.1.
ECCS 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, in millimetres:
-for coils, thickness x width;
-for sheets, thickness x width x length.
NOTE 1 By agreement, the symbol “ x C” after width may be designated for coils.
NOTE 2 By agreement, the symbol “w” may be designated after number of width to show the rolling width.
EXAMPLE
Single cold-reduced ECCS sheet, in accordance with this International Standard, steel grade T61, continuously annealed
(CA), stone finish, with a thickness of 0,22 mm, a width of 800 mm and a length of 900 mm shall be designated:
ISO 11950 – T61 - CA - stone - 0,22 x 800 x 900
Double cold-reduced ECCS coil, in accordance with this International Standard, steel grade T75, continuously annealed
(CA), stone finish, with a thickness of 0,18 mm and a width of 750 mm shall be designated:
ISO 11950 - T75 - CA - stone - 0,18 x 750
ECCS coil, in accordance with this International Standard, steel grade TH415, continuously annealed (CA), stone finish
(ST), with a thickness of 0,20 mm, a width of 750 mm shall be designated:
ISO 11950 - TH415 - CA - ST - 0,20 x 750 x C
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ISO/DIS 11950:2013
ECCS sheet, in accordance with this International Standard, steel grade TS520, batch annealed (BA), stone finish, with a
thickness of 0,14 mm, a rolling width of 844 mm and a length of 755 mm shall be designated:
ISO11950 - TS520 - BA - stone - 0,14 x 844w x 755
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 an area or mass basis;
c) end use;
d) any further special requirements.
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
In addition to the information in 5.2, the purchaser may wish to provide further information to the manufacturer
to ensure that the order requirements are consistent with the end use of the product.
The purchaser shall inform the manufacturer of any modifications to his fabrication operations that will
significantly affect the way in which the ECCS is used.
NOTE When ordering cold-reduced ECCS, the purpose of manufacture for which the material is intended should be
stated. When double cold-reduced ECCS is used for built-up can bodies, the rolling direction should be around the
circumference of the can so as to minimize the hazard of flange cracking. In such cases, the direction of rolling should be
clearly designated on the contract.
6 Manufacturing features
6.1 Manufacture
Continuously cast, fully-killed steel is applied except when otherwise specified. The examples of the steel
types of ECCS are shown in Annex C.
The steel type of ECCS shall be designed to secure food safety if ECCS is used for food application. The
purchasers should be aware of existing national regulations which may impose limitations on some elements.
The methods of manufacture ECCS are the province of the manufacturer and are not specified in this
International Standard.
6.2 Annealing
Annealing of ECCS 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
ECCS is usually available in the finishes as indicated in Table 1.
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ISO/DIS 11950:2013
Table 1 — Typical finishes for ECCS
a)
ECCS finish Code Blackplate
b)
Surface roughness
finish
Ra
µm
Smooth Smooth ≤0,35
Fine stone FS Fine stone 0,25 – 0,45
Stone ST Stone 0,35 – 0,60
Matt MM Matt ≥ 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 Special surface finishes may be available and should be agreed upon at the time of ordering.
NOTE 2 Double cold-reduced ECCS is usually supplied with a stone finish.
NOTE 3 For guidance on the measurement of surface roughness, refer to ISO 4288.
6.4 Oiling
Under normal conditions of transport and storage, ECCS shall be suitable for surface treatments such as
established lacquering and printing operations.
ECCS coils and sheets are supplied with an oil coating. The oil shall be one that is recognized (i.e. by the
relevant national or international authority) as being suitable for food packaging. Unless otherwise agreed at
the time of ordering, the kind of oil is at discretion of the manufacturer.
NOTE For the oil, DOS (dioctyl sebacate) is usually used.
6.5 Imperfections
6.5.1 Coils
The manufacturer is expected to employ his normal quality control and line inspection procedures to ensure
that the ECCS manufactured is in accordance with the requirements of this International Standard.
However, the production of ECCS coils in continuous-strip mill operations does not afford the opportunity for
removal of all ECCS that does not comply with the requirements of this International Standard.
At the time of shearing, sheets not conforming to the standard grade shall be set aside by the purchaser or his
agent.
The quantity of sheets complying with this International Standard shall be at least 90 % of any one coil.
NOTE Items a) and b) in 3.5 cannot be verified by specific tests and should be the subject of a special agreement
between the purchaser and the manufacturer.
If, when processing ECCS coil, the purchaser (or his agent) encounters recurring imperfections which in his
opinion seem excessive, it is essential, where practicable, that he stops processing the coil and advises the
manufacturer.
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ISO/DIS 11950:2013
The purchaser is expected to have adequate handling, roller levelling and shearing equipment and inspection
facilities to segregate the sheets not conforming to the standard grade, and to take reasonable care during
these operations.
6.5.2 Sheets
Sheets shall not contain any imperfections as defined in 3.5.
7 Chromium/chromium in oxide coating mass
The minimum and maximum average values of coating mass of the samples selected in accordance with
clause 11 shall be as given in Table 2, when tested as described in 12.1.
Table 2 - Average chromium/chromium in oxide coating mass
Average coating mass
on each surface
Form of chromium
2
mg/m
Minimum Maximum
Total chromium 50 185
Chromium in oxide 5 35
8 Mechanical properties
8.1 General
For the purposes of this International Standard, ECCS 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 ECCS 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
hardness test or by the tensile test.
8.2 Hardness requirement
The hardness values for ECCS shall be as given in Table A.1 and Table A.2, when tested as described in
12.2.
8.3 Tensile property requirement
The proof strength (R ) for ECCS shall be as given in Table B.1 , when tested as described in 12.3.
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 12.3 shall be used.
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ISO/DIS 11950:2013
9 Tolerances on dimensions and shape
9.1 General
Tolerances on dimensions (i.e. thickness, width and length) and shape (i.e. edge camber, out-of-squareness
and flatness) are specified in 9.2 to 9.7, together with appropriate methods of measurement.
9.2 Thickness and feather edge
9.2.1 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 ECCS shall not deviate from the ordered nominal thickness by more than +5,-8 % at any
point except within 10 mm 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.
9.2.2 Feather edge
For both sheet and coil, 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 %
9.3 Width
The width of ECCS shall 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.
9.4 Length
9.4.1 Length of coils
The difference between the actual length and the manufacturer’s indicated length, measured on any single
coil, shall not exceed by more than ± 3 %.
9.4.2 Length of sheets
The length of sheet shall be measured to the nearest 0,5 mm. The measured length shall not deviate by more
than +3, -0 mm from the ordered length.
9.5 Edge camber
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 and Figure 2).
The edge camber, E, expressed as a percentage of the chord length, is calculated using the following
formula:
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ISO/DIS 11950:2013
D
E = x 100
L
where
D is the deviation from a straight line, in millimetres
L is the length of chord, in millimetres
For coils, the edge camber, measured over a distance (chord length) of 1 m, shall not exceed 0,1 % (i.e. 1
mm).
1m
Key
W rolling width
D deviation from a straight line
Figure 1 – Edge camber of
...
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