ISO 20805:2017

INTERNATIONAL ISO
STANDARD 20805
Third edition
2017-11
Hot-rolled steel sheet in coils of
higher yield strength with improved
formability and heavy thickness for
cold forming
Tôles fortes en acier laminées à chaud à limite d'élasticité et aptitude
au formage accrues, en bobines, pour formage à froid
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Conditions of manufacture . 2
5.1 Steelmaking . 2
5.2 Chemical composition . 2
5.3 Chemical analysis . 3
5.3.1 Heat analysis . . 3
5.3.2 Product analysis . 3
5.4 Mechanical properties . 3
5.5 Application . 4
5.6 Weldability . 4
5.7 Surface condition . 5
5.8 Oiling . 5
6 Dimensional and shape tolerances . 5
7 Sampling — Tensile test . 6
8 Mechanical property tests . 6
8.1 Tensile test . 6
8.2 Impact test . 6
9 Retests . 6
9.1 Machining and flaws. 6
9.2 Elongation . 7
9.3 Additional tests . 7
10 Resubmission . 7
11 Workmanship . 7
12 Inspection and acceptance . 7
13 Coil size . 7
14 Marking . 8
15 Information to be supplied by the purchaser. 8
Bibliography . 9
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
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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).
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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 third edition cancels and replaces the second edition (ISO 20805:2011), which has been technically
revised.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 20805:2017(E)
Hot-rolled steel sheet in coils of higher yield strength with
improved formability and heavy thickness for cold forming
1 Scope
This document is applicable to continuous hot-rolled steel sheet in coils of higher yield strength with
improved formability and heavy thickness for cold forming. The steel can be treated to achieve inclusion
control. It is generally used in the as-delivered condition.
As a result of the combination of higher strength and improved formability, it is possible to obtain
savings in mass along with better weldability.
The product is intended for applications where parts are to be fabricated requiring better formability
than is provided by normal high-yield-strength steel sheet.
The steel sheet is produced in a number of grade designations designed to be compatible with differing
application requirements.
This document does not apply to
— steels intended for boilers or pressure vessels,
— steels designated as commercial quality, drawing quality or structural quality,
— steels rolled to cold-reduced products,
— steels designated as weathering steels, having increased atmospheric corrosion resistance, or
— those products rolled on a plate mill.
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
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
microalloying elements
elements, such as niobium, vanadium, titanium, etc., added singly or in combination to obtain higher
strength levels combined with better formability, weldability and toughness as compared with non-
alloyed steel produced to equivalent strength levels
3.2
hot-rolled steel sheet in coils
steel sheet in coil form manufactured through hot-rolling process, where the material was heated
before rolling to achieve the required sheet thickness and tolerances
Note 1 to entry: The product has a surface covered with oxide or scale resulting from the hot-rolling operation.
3.3
hot-rolled descaled steel sheet in coils
hot-rolled steel sheet in coils (3.2), from the surface of which oxide or scale has been removed, commonly
by pickling in an acid solution
Note 1 to entry: This product is normally supplied oiled.
Note 2 to entry: Descaling may also be performed by mechanical methods such as grit blasting.
3.4
mill edge
normal edge without any definite contour produced in hot-rolling
Note 1 to entry: Mill edges may contain some irregularities such as cracked or torn edges or thin (feathered) edges.
3.5
sheared edge
normal edge obtained by shearing, slitting or trimming a mill-edge product
Note 1 to entry: Normal processing does not necessarily provide a definite positioning of the slitting burr.
3.6
lot
up to a specified quantity of steel sheet of the same grade rolled to the same thickness and condition
3.7
edge camber
greatest deviation of a side from a straight line, the measurement being taken on the concave side with
a straight edge
4 Dimensions
The product is commonly produced in the range of thicknesses greater than 6 mm to 25 mm, and widths
of 600 mm and over, in coils. Hot-rolled sheet less than 600 mm wide can be slit from wide sheet and
will be considered as sheet.
5 Conditions of manufacture
5.1 Steelmaking
Unless otherwise agreed upon by the interested parties, the processes used in making the steel and in
manufacturing hot-rolled 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
5.2.1 The chemi
...