ISO 15211:2012

Continuous hot-dip zinc-coated twin-roll cast steel sheet of structural quality and high strength steel

This International Standard specifies the characteristics of continuous hot-dip zinc-coated twin-roll cast steel sheet products of structural quality and high strength steel. The product is intended for applications where resistance to corrosion is of prime importance. The steel sheet is produced in a number of grades, coating mass, ordering conditions and surface treatments.

Tôles coulées entre cylindres et galvanisées en continu par immersion à chaud, de qualité destinée à la construction et en acier à haute résistance

General Information

• Status: Withdrawn
• Publication Date: 08-Mar-2012
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Drafting Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 28-Feb-2022

Relations

• Revised: ISO 15211:2022 - Steel sheet, twin-roll cast, zinc-coated by the continuous hot-dip process, of structural quality and high strength
• Effective Date: 11-Nov-2017

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15211
First edition
2012-03-15
Continuous hot-dip zinc-coated twin-roll
cast steel sheet of structural quality and
high strength steel
Tôles coulées entre cylindres et galvanisées en continu par immersion à
chaud, de qualité destinée à la construction et en acier à haute résistance
Reference number
ISO 15211:2012(E)
©
ISO 2012

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ISO 15211:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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Published in Switzerland
ii © ISO 2012 – All rights reserved

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ISO 15211:2012(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 . 4
6 Coating . 5
6.1 Coating mass . 5
6.2 Coating adherence . 6
6.3 Weldability . 7
6.4 Painting . 7
7 Surface treatment . 7
7.1 Mill passivation . 7
7.2 Mill phosphating . 7
7.3 Oiling . 7
8 Dimensional and shape tolerances . 8
9 Sampling . 8
9.1 Chemical composition . 8
9.2 Tensile test . 8
9.3 Coating tests . 8
9.4 Retest . 8
10 Test methods . 9
10.1 Tensile test . 9
10.2 Coating properties . 9
11 Designation system . 9
11.1 General . 9
11.2 Coating type . 9
11.3 Coating mass . 9
11.4 Coating conditions . 9
11.5 Surface treatment .10
11.6 Structural grades .10
11.7 Example of designation .10
11.8 Resubmission .10
12 Workmanship .10
13 Inspection and acceptance . 11
14 Marking . 11
15 Information to be supplied by the purchaser . 11
Annex A (normative) Orders requiring base-metal thickness .13
Bibliography .14
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ISO 15211:2012(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 15211 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat
rolled products.
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INTERNATIONAL STANDARD ISO 15211:2012(E)
Continuous hot-dip zinc-coated twin-roll cast steel sheet of
structural quality and high strength steel
1 Scope
This International Standard specifies the characteristics of continuous hot-dip zinc-coated twin-roll cast steel
sheet products of structural quality and high strength steel.
The product is intended for applications where resistance to corrosion is of prime importance.
The steel sheet is produced in a number of grades, coating mass, ordering conditions and surface treatments.
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 descaled sheet coils on a
continuous zinc-coating line
3.2
normal coating
layer formed as a result of unrestricted growth of zinc or zinc alloy crystals during normal solidification
NOTE Normal coating 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 11.4); however, it can 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 or zinc alloy
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 15211:2012(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 structural quality and high strength twin-roll cast steel sheet is produced in thicknesses of up
to 2,0 mm after zinc coating, and in widths of up to 2 000 mm in coils and cut lengths.
4.2 Zinc-coated 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 will 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, 2 and 3. Upon request,
a report of the heat analysis shall be made to the purchaser.
A verification analysis (product analysis) may be carried out by the purchaser to verify the specified analysis of
the semi-finished or finished steel. The product analysis tolerances are shown in Table 4.
The processes used in making the steel and in manufacturing the zinc-coated sheet of structural quality are
left to the discretion of the manufacturer. If requested, the purchaser shall be informed of the steel-making
process being used.
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ISO 15211:2012(E)
Table 1 — Chemical composition — Heat analysis
Mass fractions in per cent maximum
Base-metal
a
C Mn P S Si
quality
Structural — All
0,25 1,35 0,035 0,040 –
grades
a
In this table, “–” indicates that there is no requirement, but the analysis shall be reported.
a
Table 2 — Chemical requirements — Heat analysis— High strength steel
Mass fractions in per cent maximum
a a
Designation C Mn P S Si V Ti Nb N
min. min. min.
c
Grade
b
HSS 310 Class 1 0,22 1,35 0,04 0,04 – 0,008 0,008 0,008 –
HSS 310 Class 2 0,15 1,35 0,04 0,04 – 0,008 0,008 0,008 –
b
HSS 340 Class 1 0,23 1,35 0,04 0,04 – 0,008 0,008 0,008 –
HSS 340 Class 2 0,15 1,35 0,04 0,04 – 0,008 0,008 0,008 –
b
HSS 380 Class 1 0.25 1,35 0,04 0,04 – 0,008 0,008 0,008 –
HSS 380 Class 2 0,15 1,35 0,04 0,04 – 0,008 0,008 0,00 –
HSS 410 Class 1 0,26 1,50 0,04 0,04 – 0,008 0,008 0,008 –
HSS 410 Class 2 0,15 1,50 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 450 Class 1 0,26 1,50 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 450 Class 2 0,15 1,50 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 480 Class 1 0,26 1,65 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 480 Class 2 0,15 1,65 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 550 Class 1 0,26 1,65 0,04 0,04 – 0,008 0,008 0,008 –
c
HSS 550 Class2 0,15 1,65 0,04 0,04 – 0,008 0,008 0,008 –
a
In this table, “–” indicates that there is no requirement for Si and N, but the analysis shall be reported.
b
For each reduction of 0,01 % below the specified carbon maximum, an increase of 0,06 % manganese above the specified
maximum shall be permitted up to a maximum of 1,50 %.
c
The purchaser has the option of restricting the nitrogen content. It should be noted that, depending on the microalloying scheme
(for example use of vanadium) of the producer, nitrogen is permitted as a deliberate addition. Consideration should be given to the use
of nitrogen-binding elements (for example vanadium and titanium).
a
Table 3 — Limits on additional chemical elements for structural steel
Mass fractions in per cent
Cu Ni Cr Mo Nb V Ti
Element
max
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 the 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 %.
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ISO 15211:2012(E)
Table 4 — Product analysis tolerances
Mass fractions in per cent
Element Maximum of specified element Tolerance over the maximum specified
Carbon ≤ 0,26 0,04
Manganese ≤ 01,65 0,05
Phosphorus ≤ 0,04 0,01
Sulfur ≤ 0,04 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
Structural quality and high strength grades shall satisfy the mechanical properties shown in Tables 5 and 6. On
request, a report of the mechanical properties shall be made to the purchaser.
Table 5 — Mechanical properties of structural quality twin-roll cast steel sheet
b
A, min.
a
R min. R min.
e m
Grade
e ≤ 2 mm
MPa MPa
L = 50 mm L = 80 mm
o o
HR275 275 380 15 14
HR340 340 340 9 8
HR380 380 380 8 7
HR410 410 410 7 6
HR480 480 480 6 5
HR550 550 550 5 4
R = lower yield strength
e
R = tensile strength
m
A = percentage elongation after fracture
L = gauge length on test piece
o
e = thickness of steel sheet, in millimetres
2
1 MPa = 1 N/mm
a
The yield stress specified in this table shall be the lower yield stress, R . The values
...