ISO 3575:2025

International
Standard
ISO 3575
Sixth edition
Continuous hot-dip zinc-coated and
2025-04
zinc-iron alloy-coated carbon steel
sheet of commercial and drawing
qualities
Tôles en acier au carbone galvanisées en continu par immersion à
chaud, de qualité commerciale et pour emboutissage
Reference number
© ISO 2025
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ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 3
5 Conditions of manufacture . 3
5.1 Steelmaking .3
5.2 Chemical composition .3
5.3 Chemical analysis .3
5.3.1 Heat analysis .3
5.3.2 Product analysis .3
5.4 Mechanical properties .4
5.4.1 Ordering conditions .4
5.4.2 Fabrication qualities .5
5.4.3 Interstitial free steel .5
5.5 Coating .6
5.5.1 Coating mass .6
5.5.2 Coating adherence.7
5.6 Weldability .8
5.7 Painting .8
5.8 Surface treatment .8
5.8.1 Mill passivation .8
5.8.2 Mill phosphating .8
5.8.3 Oiling .9
5.9 Coated coil joining .9
5.10 Dimensional and shape tolerances .9
6 Sampling . 9
6.1 Tensile test .9
6.2 Coating tests .9
6.2.1 Coating mass .9
6.2.2 Triple-spot test .9
6.2.3 Single-spot test .9
6.2.4 Coating adherence.10
7 Test methods . 10
7.1 Tensile test .10
7.2 Coating properties.10
7.2.1 Coating mass .10
7.2.2 Coating adherence.10
8 Designation system . 10
8.1 General .10
8.2 Coating type .10
8.3 Coating mass .10
8.4 Coating finish condition .11
8.5 Surface treatment .11
8.6 Base-metal quality designation .11
8.7 Examples .11
9 Retests .12
9.1 Machining and flaws . . 12
9.2 Elongation . 12
9.3 Additional tests . 12
10 Resubmission.12

iii
11 Workmanship .13
12 Inspection and acceptance .13
13 Coil size .13
14 Marking . .13
15 Information to be supplied by the purchaser . 14
Annex A (normative) Orders requiring base-metal thickness .15
Bibliography . 17

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
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constitute an endorsement.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill
flat rolled products.
This sixth edition cancels and replaces the fifth edition (ISO 3575:2016), which has been technically revised.
The main changes are as follows:
— the terms and definitions have been updated;
— coating mass designations “Z080”, “Z120”, “Z140”, “Z220”, “ZF080” and “ZF120” have been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
International Standard ISO 3575:2025(en)
Continuous hot-dip zinc-coated and zinc-iron alloy-coated
carbon steel sheet of commercial and drawing qualities
1 Scope
This document specifies the requirements for steel sheet, in coils and cut lengths, metallic-coated by the
continuous hot-dip process, with zinc and zinc-iron alloy coatings.
The product is intended for applications requiring corrosion resistance, formability and paintability.
The steel sheet is produced in a number of designations, coating masses, surface treatments and coating
conditions designed to be compatible with differing application requirements.
[1]
This document does not cover steel designated as structural quality, which are covered in ISO 4998.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 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 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.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
commercial
base-metal quality intended for general fabricating purposes where sheet is used in the flat condition, or for
bending or moderate forming
3.2
drawing
base-metal quality intended for parts where drawing or severe forming may be involved

3.3
deep drawing
base-metal quality intended for parts where severe forming or severe drawing may be involved
3.4
deep drawing aluminium killed
base-metal quality intended for fabricating parts where particularly severe drawing or forming may be
involved
3.5
extra-deep drawing stabilized
base-metal quality intended for applications where maximum formability is required by applying interstitial-
free steel
3.6
interstitial-free steel
IF steel
extra-low-carbon steel in which all interstitial elements are stabilized with titanium and/or equivalent
elements
Note 1 to entry: Interstitial-free steel is sometimes referred to as stabilized steel.
3.7
zinc-coated steel sheet
product obtained by hot-dip coating of cold-reduced sheet coils or hot-rolled descaled sheet coils on a
continuous zinc-coating line
3.8
zinc-iron alloy-coated steel sheet
product obtained by heating after processing the zinc-coated steel sheet so that the coating formed on the
base metal is composed of zinc-iron alloys
Note 1 to entry: This product, designated ZF, is not spangled, is normally dull in appearance and, for some applications,
can be suitable for immediate painting without further treatment, except normal cleaning. Zinc-iron alloy coatings can
powder during severe forming.
3.9
differential coating
coating deliberately produced to have a different coating mass on each surface
3.10
breakage allowance
agreed upon level of acceptable die breakage not subject to claim
3.11
normal coating
coating formed as a result of unrestricted growth of zinc crystals during normal solidification
Note 1 to entry: This coating has a metallic lustre and is the type normally furnished for a wide variety of applications.
It can be furnished S (normal coating, with skin pass) or N (normal coating, no skin pass); however, it can be variable in
appearance and not suitable for decorative painting.
3.12
minimized spangle
finish obtained by restricting normal spangle formation during the solidification of the zinc
Note 1 to entry: This product can have some lack of uniformity in surface appearance within a coil, or from coil to coil.

3.13
skin pass
light cold-rolling of the product
Note 1 to entry: The purpose of the skin passing is one or more of the following: to minimize the appearance of coil
breaks, stretcher strains and fluting; to control the shape; and to obtain the required surface finish.
Note 2 to entry: Some increase in hardness and some loss in ductility will result from skin passing.
3.14
lot
specified quantity of steel sheet of the same designation rolled to the same thickness and coating condition
3.15
coating mass
total amount of coating on both sides of the sheet, expressed in grams per square metre (g/m ) of sheet
4 Dimensions
4.1 Zinc-coated and zinc-iron alloy-coated steel sheet is produced in thicknesses from 0,25 mm to 5 mm
inclusive after coating, and in widths of 600 mm and over in coils and cut lengths. Zinc-coated and zinc-iron
alloy-coated steel sheet less than 600 mm wide, slit from wide sheet, is considered as sheet.
4.2 The thickness of zinc-coated and zinc-iron alloy-coated steel sheet may be specified as a combination
of the base-metal and metallic coating, or as the 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 will be provided. Annex A describes
the requirements for specifying the thickness of the base-metal alone.
5 Conditions of manufacture
5.1 Steelmaking
Unless otherwise agreed by the interested parties, the processes used in making the steel and in
manufacturing zinc-coated and zinc-iron alloy-coated steel sheet are left to the discretion of the
manufacturer. On request, the purchaser shall be informed of the steelmaking process being used.
5.2 Chemical composition
The chemical composition (heat analysis) shall conform to the requirements given in Tables 1 and 2.
5.3 Chemical analysis
5.3.1 Heat analysis
An analysis of each heat shall be made by the manufacturer in order to determine compliance with the
requirements given in Tables 1 and 2. On request, a report of the heat analysis shall be made available to the
purchaser or the purchaser’s representative. Each of the elements listed in Tables 1 and 2 shall be included
in the report of the heat analysis. When the amount of copper, nickel, chromium or molybdenum present is
less than 0,02 %, the analysis may be reported as “<0,02 %”.
5.3.2 Product analysis
A product analysis may be made by the purchaser in order to verify the specified analysis of the product
and shall take into consideration any normal heterogeneity. The product analysis tolerances shall be in
accordance with Tables 2 and 3.

Table 1 — Chemical composition (heat analysis)
Mass fractions in percent
Base-metal quality C Mn P S Ti
Designation Name max. max. max. max. max.
01 Commercial 0,15 0,60 0,05 0,035 —
a
02 Drawing 0,10 0,50 0,04 0,035 —
a
03 Deep drawing 0,08 0,45 0,03 0,030 —
Deep drawing —
a
04 0,06 0,45 0,03 0,030
aluminium killed
Extra-deep drawing
a
05 0,02 0,25 0,02 0,020 0,15
stabilized
a Interstitial-free steel may be applied (see 5.4.3).
Table 2 — Limits on additional chemical elements
Mass fractions in percent
a a a,b a,b c c,d c
Cu Ni Cr Mo Nb V Ti
Element
max. max. max. max. max. max. max.
Heat analysis 0,20 0,20 0,15 0,06 0,008 0,008 0,008
Product
0,23 0,23 0,19 0,07 0,018 0,018 0,018
analysis
a The sum of copper, nickel, chromium and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these
elements are specified, the sum does not apply, in which case, only the individual limits on the remaining elements apply.
b The sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are
specified, the sum does not apply, in which case, only the individual limits on the remaining elements apply.
c For interstitial-free steels only, the value of 0,15 % titanium, and 0,10 %
...