ISO 9364:2017
(Main)Steel sheet, 55 % aluminium-zinc alloy-coated by the continuous hot-dip process, of commercial, drawing and structural qualities
Steel sheet, 55 % aluminium-zinc alloy-coated by the continuous hot-dip process, of commercial, drawing and structural qualities
ISO 9364:2017 is applicable to the requirements for steel sheet, in coils and cut lengths, metallic-coated by the continuous hot-dip process with 55 % aluminium-zinc alloy coating. The product is intended for applications requiring the corrosion characteristics of aluminium coupled with those of zinc, or heat resistance, or both. The steel sheet is produced in a number of quality designations and grades, coating mass, surface treatments and coating finish conditions designed to be compatible with differing application requirements.
Tôles en acier revêtues en continu par immersion à chaud d'une couche d'alliage aluminium-zinc 55 % de qualité commerciale, pour emboutissage ou destinées à la construction
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INTERNATIONAL ISO
STANDARD 9364
Fifth edition
2017-11
Steel sheet, 55 % aluminium-zinc
alloy-coated by the continuous hot-dip
process, of commercial, drawing and
structural qualities
Tôles en acier revêtues en continu par immersion à chaud d'une
couche d'alliage aluminium-zinc 55 % de qualité commerciale, pour
emboutissage ou destinées à la construction
Reference number
ISO 9364:2017(E)
©
ISO 2017
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ISO 9364:2017(E)
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© ISO 2017, Published in Switzerland
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ISO 9364:2017(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
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 Commercial and drawing quality . 4
5.4.2 Structural quality . . 5
5.5 Coating . 6
5.5.1 Coating mass. 6
5.5.2 Coating adherence . 7
5.6 Weldability . 7
5.7 Painting . 7
5.8 Coating finish condition . 7
5.9 Surface treatment . 8
5.9.1 Mill passivation . 8
5.9.2 Oiling . 8
5.10 Coated coil joining . 8
5.11 Dimensional and shape tolerances . 8
6 Sampling . 8
6.1 Tensile test . 8
6.2 Coating tests . 8
6.2.1 Coating mass. 8
6.2.2 Triple-spot test . 8
6.2.3 Single-spot test . 9
6.2.4 Coating adherence . 9
7 Test methods . 9
7.1 Tensile test . 9
7.2 Coating properties . 9
7.2.1 Coating mass. 9
7.2.2 Coating adherence . 9
8 Designation system . 9
8.1 General . 9
8.2 Coating designation . 9
8.3 Coating mass .10
8.4 Coating finish condition .10
8.5 Surface treatment .10
8.6 Base-metal quality .10
8.7 Examples .10
9 Retests .11
9.1 Machining and flaws.11
9.2 Elongation .11
9.3 Additional tests .11
10 Resubmission .11
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ISO 9364:2017(E)
11 Workmanship .12
12 Inspection and acceptance .12
13 Coil size .12
14 Marking .12
15 Information to be supplied by the purchaser.13
Annex A (normative) Orders requiring base-metal thickness .14
Bibliography .15
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ISO 9364:2017(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 voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: 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 fifth edition cancels and replaces the fourth edition (ISO 9364:2011), which has been technically
revised.
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INTERNATIONAL STANDARD ISO 9364:2017(E)
Steel sheet, 55 % aluminium-zinc alloy-coated by the
continuous hot-dip process, of commercial, drawing and
structural qualities
1 Scope
This document is applicable to the requirements for steel sheet, in coils and cut lengths, metallic-coated
by the continuous hot-dip process with 55 % aluminium-zinc alloy coating.
The product is intended for applications requiring the corrosion characteristics of aluminium coupled
with those of zinc, or heat resistance, or both.
The steel sheet is produced in a number of quality designations and grades, coating mass, surface
treatments and coating finish conditions designed to be compatible with differing application
requirements.
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:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
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
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ISO 9364:2017(E)
3.3
deep drawing
base-metal quality intended for parts where severe forming or severe drawing (3.2) may be involved
3.4
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”.
3.5
breakage allowance
agreed upon level of acceptable die breakage not subject to claim
3.6
normal spangle
coating formed as a result of unrestricted growth of aluminium-zinc alloy crystals during normal
solidification
3.7
smooth finish
smoothness produced by skin passing (3.8) the coated material in order to achieve an improved surface
condition as compared with the normal as-coated product
3.8
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.
3.9
differential coating
coating deliberately produced to have a different coating mass (3.11) on each surface
3.10
lot
up to a specified quantity of steel sheet of the same designation rolled to the same thickness and coating
condition
3.11
coating mass
total amount of coating on both sides of the sheet
Note 1 to entry: Coating mass is expressed in grams per square metre.
4 Dimensions
4.1 55 % aluminium-zinc 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. 55 % aluminium-zinc
alloy-coated steel sheet less than 600 mm wide, slit from wide sheet, is considered as sheet.
4.2 The thickness of 55 % aluminium-zinc 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
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ISO 9364:2017(E)
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 as 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 55 % aluminium-zinc 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 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
Designation Name
max. max. max. max.
01 Commercial 0,10 0,60 0,030 0,035
a
02 and 03 Drawing and deep drawing 0,06 0,50 0,020 0,025
b
220 to 550 Structural 0,25 1,15 0,05 0,035
a
Interstitial-free steel may be applied (see 5.4.1.3).
b
Grades 250 and 280: phosphorus – 0,10 % max. Grade 350: phosphorus – 0,20 % max.
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ISO 9364:2017(E)
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
0,20 0,20 0,15 0,06 0,008 0,008 0,008
analysis
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 % maximum for titanium, and 0,10 % maximum for niobium and
vanadium are acceptable to ensure that the carbon and nitrogen are fully stabilized.
d
Heat analysis greater than 0,008 % may be supplied after agreement between the manufacturer and the purchaser.
Table 3 — Product analysis tolerances for Table 1
Mass fractions in percent
Maximum of specified Tolerance over maximum
Element
element specified
0,15 0,03
C
0,25 0,04
Mn 1,15 0,05
P 0,20 0,01
S 0,035 0,01
NOTE The maximum tolerance is the allowable excess over the requirement of heat analysis shown in Table 1.
5.4 Mechanical properties
5.4.1 Commercial and drawing quality
5.4.1.1 Ordering conditions
55 % aluminium-zinc alloy-coated steel sheet of designations 02 and 03 are supplied under either of the
following two ordering conditions.
a) Ordering condition A: steel sheet mechanical properties shall, at the time the steel is made available
for shipment, satisfy the applicable requirements of Table 4, when they are determined on test
pieces obtained in accordance with the requirements in Clause 7. The values specified in Table 4 are
applicable for the periods indicated in Table 5 from the time that the steel is available for shipment.
b) Ordering condition B: steel sheet, ordered to make an identified part, shall be supplied with
a commitment for satisfactory manufacturing performance within an established breakage
allowance, which shall be previously agreed upon by the interested parties. In the agreement, the
part name, the details of fabrication, and special requirements (such as freedom from stretcher
strain or fluting) shall be specified.
In the case of ordering condition B, mechanical properties of the steel sheet may also be agreed upon
by the interested parties and such properties may not necessarily satisfy the requirements of Table 4.
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ISO 9364:2017(E)
5.4.1.2 Fabrication qualities
55 % aluminium-zinc alloy-coated steel sheet is available in three fabrication qualities as given in
3.1 to 3.3.
5.4.1.3 Interstitial-free steel
Stabilized interstitial-free (IF) steel is applicable to orders for designations 02 and 03, provided that
the purchaser is informed of the substitution and that related shipping documents reflect the actual
material shipped.
Table 4 — Mechanical properties of commercial and drawing quality grades
R R A
eL m
a b c
Base-metal quality max. max. min.
MPa MPa %
d
Designation Name L = 80 mm L = 50 mm L = 5,65 S
o o
o
o
01 Commercial — — — — —
e
02 Drawing 300 430 23 24 22
03 Deep drawing 260 410 25 26 24
R = lower yield strength
eL
R = tensile strength
m
A = percentage elongation after fracture
L = gauge length of original test piece
o
S = original cross-sectional area of gauge length
o
2
1 MPa = 1 N/mm
For products produced according to the performance criteria (ordering condition B), the typical mechanical properties
presented here are non-mandatory. For products specified according to mechanical properties (ordering condition A),
the purchaser may negotiate with the manufacturer if a specific range, or a more restrictive range, is required for the
application. When agreed to, such values may be specified.
NOTE With the exception of footnote c, these typical mechanical properties apply to the full range of steel sheet thicknesses.
The yield strength tends to increase and some of the formability aspects tend to decrease as the sheet thickness decreases.
a
The values apply to 0,2 % proof strength when a definite yield phenomenon is not present, otherwise to the lower yield
strength (R ).
eL
b
The minimum tensile strength for qualities, 02 and 03, would normally be expected to be 270 MPa. All tensile strength
values are determined to the nearest 10 MPa.
c
For material up to and including 0,6 mm in thickness, the elongation values in this table shall be reduced by 2.
d
This may be used for material over 3 mm in thickness.
e
This value applies to skin-passed products only.
Table 5 — Applicable period for values specified in Table 4
Designation Period
01 Not applicable
02 8 d
03 30 d
5.4.2 Structural quality
The mechanical properties, at the time the steel is made available for shipment, shall satisfy the
requirements of Table 6.
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ISO 9364:2017(E)
Table 6 — Mechanical properties of structural quality grades and coating bend test
A
Coated metal 180° bend
R R
eL m
mandrel diameter
a
min.
Grade
min. min.
b
mm
designation %
MPa MPa L = 80 mm L = 50 mm e < 3 e ≥ 3
o o
220 220 320 18 20 1a 2a
250 250 350 16 18 1a 2a
280 280 390 14 16 2a 3a
320 320 430 12 14 3a 3a
350 350 450 10 12 — —
c
550 550 560 — — — —
R = lower yield strength
eL
R = tensile strength
m
A = percentage elongation after fracture
L = gauge length of original test piece
o
e = thickness of steel sheet in mm
a= thickness of bend test piece in mm
2
1 MPa = 1 N/mm
NOTE 1 R is measured by 0,5 % total elongation proof strength (proof strength under load) or by 0,2 % offset when a
eL
definite yield phenomenon is not present.
NOTE 2 In determining the base-metal mechanical properties, the base-metal thickness is measured after stripping the
coating from the end of the specimen contacting the grips of the tension-testing machine before testing.
a
The elongation values in the table shall be reduced by 2 and the yield strength increased by 20 MPa for material up to
and including 0,6 mm in thickness.
b
Bend testing for coating adherence is not applicable to grade 550.
c
Grade 550 is in the unannealed condition and therefore has limited ductility. If the hardness is 85 HRB or higher, no
tension test is required.
5.5 Coating
5.5.1 Coating mass
The coating mass limits shall conform to the limits for the designations shown in Table 7. The coating
mass is the total amount of coating on both sides of the sheet, expressed in grams per square metre. The
interested parties shall agree upon the coating mass of differentially coated products. If a maximum
coating mass is required, the manufacturer shall be notified at the time of ordering.
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ISO 9364:2017(E)
Table 7 — Coating mass (total both sides)
Minimum check limit
Coating mass
Triple-spot test Single-spot test
designation
2 2
g/m g/m
a
AZ070 70 60
AZ090 90 75
AZ100 100 85
AZ120 120 102
AZ150 150 130
AZ165 165 140
AZ185 185 160
AZ200 200 170
NOTE 1 Because of the many variables and changing conditions that are characteristic of continuous aluminium-zinc
coating, the coating mass is not always evenly divided between the two surfaces of a sheet, neither is the coating evenly
distributed from edge to edge. However, it can normally be expected that no less than 40 % of the single-spot check limit
will be found on either surface.
NOTE 2 The coating thickness can be estimated from the coating mass by using the following relationship:
2
100 g/m total mass both sides ≅ 0,026 mm total thickness both sides.
a
AZ070 is available only upon agreement between the purchaser and the manufacturer.
5.5.2 Coating adherence
For commercial, drawing and deep drawing qualities, 55 % aluminium-zinc alloy-coated steel sheet
shall be capable of being bent 180° flat on itself in any direction, without flaking of the coat
...
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