ISO 15208:2012
(Main)Continuous hot-dip zinc-coated twin-roll cast steel sheet of commercial quality
Continuous hot-dip zinc-coated twin-roll cast steel sheet of commercial quality
This International Standard specifies the characteristics of continuous hot-dip zinc-coated twin-roll cast steel sheet of commercial quality manufactured using the twin-roll cast steel-making process. The product is intended for applications where resistance to corrosion is of prime importance. The steel sheet is produced in a number of coating mass, surface treatments and ordering conditions.
Tôles coulées entre cylindres et galvanisées en continu par immersion à chaud, en acier de qualité commerciale
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INTERNATIONAL ISO
STANDARD 15208
First edition
2012-03-15
Continuous hot-dip zinc-coated twin-roll
cast steel sheet of commercial quality
Tôles coulées entre cylindres et galvanisées en continu par immersion
à chaud, en acier de qualité commerciale
Reference number
ISO 15208:2012(E)
©
ISO 2012
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ISO 15208:2012(E)
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© ISO 2012
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ii © ISO 2012 – All rights reserved
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ISO 15208:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Thickness . 2
5 Conditions of manufacture . 2
5.1 Chemical composition . 2
5.2 Mechanical properties . 3
5.3 Coating . 3
5.4 Weldability . 4
5.5 Painting . 4
5.6 Surface treatment . 5
5.7 Coated coil joining . 5
5.8 Dimensional and shape tolerances . 5
6 Sampling . 5
6.1 Chemical composition . 5
6.2 Tensile test . 5
6.3 Coating tests . 5
6.4 Retest . 6
7 Test methods . 6
7.1 Tensile test . 6
7.2 Coating properties . 6
8 Designation system . 6
8.1 Coating type . 7
8.2 Coating mass . 7
8.3 Coating finish type . 7
8.4 Surface treatment . 7
8.5 Example of designation . 7
9 Resubmission . 8
10 Workmanship . 8
10.1 Inspection and acceptance . 8
11 Marking . 8
12 Information to be supplied by the purchaser . 9
Annex A (normative) Orders requiring base-metal thickness .10
Bibliography . 11
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ISO 15208:2012(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.
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 15208 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat
rolled products.
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INTERNATIONAL STANDARD ISO 15208:2012(E)
Continuous hot-dip zinc-coated twin-roll cast steel sheet of
commercial quality
1 Scope
This International Standard specifies the characteristics of continuous hot-dip zinc-coated twin-roll cast steel
sheet of commercial quality manufactured using the twin-roll cast steel-making process.
The product is intended for applications where resistance to corrosion is of prime importance.
The steel sheet is produced in a number of coating mass, surface treatments and ordering conditions.
2 Normative references
The following referenced documents are indispensable for the application 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 1460, Metallic coatings — Hot dip galvanized coatings on ferrous materials — Gravimetric determination
of the mass per unit area
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method
ISO 3497, Metallic coatings — Measurement of coating thickness — X-ray spectrometric methods
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7438, Metallic materials — Bend test
ISO 16160, Hot-rolled steel sheet products — Dimensional and shape tolerances
ISO 16162, Cold-rolled steel sheet products — Dimensional and shape tolerances
ISO 16163, Continuously hot-dipped coated steel sheet products — Dimensional and shape tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1
continuous hot-dip zinc-coated steel sheet
product obtained by hot-dip coating of cold-reduced sheet coils or hot-rolled sheet coils on a continuous
zinc-coating line
3.2
normal spangle
coating formed as a result of unrestricted growth of zinc or zinc iron crystals during normal solidification
NOTE Normal spangle has a metallic lustre and is the type normally furnished for a wide variety of applications. It
may be furnished as coating conditions S or N (see 8.4); however, it may be variable in appearance and is not suitable for
decorative painting.
3.3
minimized spangle coating
finish obtained by restricting normal spangle formation during the solidification of the zinc crystals
NOTE This product may have some lack of uniformity in surface appearance within a coil or from coil to coil.
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ISO 15208:2012(E)
3.4
smooth finish
surface produced by skin-passing the coated material in order to achieve an improved smooth surface condition
as compared with the normal as-coated product
3.5
differential coating
layer having a specified coating-mass designation on one surface and a different coating-mass designation on
the other surface
3.6
skin pass
light cold rolling of the zinc-coated steel sheet
NOTE The purpose of the skin pass is to produce a higher degree of surface smoothness and, thereby, improve the
surface appearance. The skin pass also temporarily minimizes the occurrence of a surface condition known as stretcher
strain (Luder’s Lines) or fluting during the fabrication of finished parts. The skin pass also controls and improves flatness.
Some increase in hardness and loss of ductility can result from skin passing.
3.7
twin-roll cast steel sheet
steel sheet produced by casting to near final thickness directly from the liquid metal with minimal hot rolling to
achieve the final thickness
4 Thickness
4.1 Zinc-coated commercial quality twin-roll cast sheet is produced in thicknesses up to 2,0 mm, inclusive,
after zinc coating, and in widths up to 2 000 mm in coils and cut lengths.
4.2 Zinc-coated twin-roll cast sheets less than 600 mm wide may be slit from wide sheets and may be
considered sheets.
4.3 The thickness of zinc-coated twin-roll cast sheet steel may be specified as a combination of the base
metal and metallic coating or base metal alone. The purchaser shall indicate on the order which method of
specifying thickness is required. In the event that the purchaser does not indicate any preference, the thickness
as a combination of the base metal and coating shall be provided. Annex A describes the requirements for
specifying the thickness as base metal alone.
5 Conditions of manufacture
5.1 Chemical composition
The chemical composition (heat analysis) shall not exceed the values given in Tables 1 and 2. On request, a
report of the heat analysis shall be made to the purchaser.
A verification analysis (product analysis) may be made by the purchaser to verify the specified analysis of
the semi-finished or finished steel, and shall take into consideration any normal heterogeneity. Non-killed
steels, such as rimmed or capped are not technologically suited for verification analysis. The product analysis
tolerances are shown in Table 3.
The processes used in making the steel and in manufacturing zinc-coated sheets of structural quality are
left to the discretion of the manufacturer. Upon request, the purchaser shall be informed of the steel-making
process being used.
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ISO 15208:2012(E)
Table 1 — Chemical composition — Heat analysis
Mass fractions in per cent maximum
Designation Quality C Mn P S Si
HRA Commercial 0,15 0,70 0,045 0,035 –
NOTE In this table, “–” indicates that there is no requirement, but the analysis shall be reported.
Table 2 — Limits on additional chemical elements
Mass fractions in per cent maximum
Element Cu Ni Cr Mo Nb V Ti
Heat analysis 0,50 0,30 0,30 0,15 0,008 0,008 0,008
Product analysis 0,53 0,33 0,34 0,16 0,018 0,018 0,018
NOTE Each of these elements listed in this table shall be included in the report of the heat analysis. Where the amount of
copper, nickel, chromium or molybdenum present is less than 0,02 %, the analysis shall be reported as < 0,02 %.
Table 3 — Product analysis tolerances
Maximum of specified element Tolerance over the maximum specified
Element
% %
Carbon ≤ 0,15 0,03
Manganese ≤ 0,70 0,05
Phosphorus ≤ 0,045 0,01
Sulfur ≤ 0,035 0,01
NOTE The maximum tolerance in this table is the allowable excess over the specified requirement and not the heat.
5.2 Mechanical properties
Commercial quality zinc-coated twin-roll cast sheet steels do not have any specified minimum mechanical
properties; however, the minimum tensile strength for commercial quality is normally expected to be 270 MPa.
Where the minimum tensile strength is required, the value of 270 MPa may be specified. All tensile strength
values are determined to the nearest 10 MPa.
5.3 Coating
5.3.1 Coating mass
The coating mass shall conform to the limits for the coating designations shown in Table 4. The coating mass
2
is the total amount of zinc on both surfaces of the sheet, expressed in grams per square metre (g/m ) of sheet.
The coating mass of differentially coated material shall be agreed upon between the interested parties. If a
maximum coating mass is required, the manufacturer shall be notified at the time of ordering.
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