ISO 15179:2022

INTERNATIONAL ISO
STANDARD 15179
Second edition
2022-02
Hot-rolled twin-roll cast steel sheet of
structural quality and high strength
steel
Tôles en acier de construction et en acier à haute résistance laminées
à chaud par coulée entre cylindres
Reference number
© ISO 2022
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ii
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 . 2
5.3.1 Heat analysis . 2
5.3.2 Product analysis . 3
5.4 Mechanical properties . 4
5.5 Application . 5
5.6 Weldability . 5
5.7 Surface condition . 5
5.8 Oiling . 6
5.9 Skin passing . 6
6 Dimensional and shape tolerances. 6
7 Tensile test sampling . 6
8 Tensile test . 6
9 Retests . 6
9.1 Machining and flaws . . 6
9.2 Elongation . 6
9.3 Additional tests . 6
10 Resubmission. 6
11 Workmanship . 7
12 Inspection and acceptance .7
13 Coil size . 7
14 Marking . . 7
15 Information supplied by the purchaser . 8
Bibliography . 9
iii
Foreword
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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 second edition cancels and replaces the first edition (ISO 15179:2012), which has been technically
revised.
The main changes are as follows:
— update of Clause 3;
— modification of the title of Clause 4.
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.
iv
INTERNATIONAL STANDARD ISO 15179:2022(E)
Hot-rolled twin-roll cast steel sheet of structural quality
and high strength steel
1 Scope
This document specifies the requirements for hot-rolled twin-roll cast steel sheet of structural quality
and high strength steel.
The product is intended for applications where specific mechanical properties are required. It is
generally used in the delivered condition and is intended for bolted, riveted or welded structures, and it
is produced on a wide strip mill, not a plate mill.
Structural quality twin-roll cast steel sheet is a carbon steel produced to specified mechanical
properties and is available in a number of grades.
High strength hot-rolled twin-roll cast steel sheet, strengthened by microalloys is produced to specified
mechanical properties and is available in a number of grades and classes.
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 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 16160, Hot-rolled 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 terminology 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
hot-rolled twin-roll cast steel sheet
product resulting from the twin-roll process to obtain the required sheet thickness and tolerances
3.2
hot-rolled twin-roll cast descaled steel sheet
hot-rolled steel sheet from which oxide or scale has been removed, commonly by pickling in an acid
solution
Note 1 to entry: Descaling can also be performed by mechanical methods such as grit blasting. Some change in
properties can result from descaling.
3.3
mill edge
normal side edge without any definite contour produced in hot-rolling
Note 1 to entry: Mill edges can contain some irregularities, such as cracked or torn edges or thin (feathered)
edges.
3.4
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 position of the slitting burr.
3.5
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
3.6
skin passing
light cold rolling of the product
Note 1 to entry: The purpose of skin passing is one or more of the following: to minimize the appearance of coil
breaks, stretcher strains and fluting; to control the shape; or to obtain the required surface finish.
Note 2 to entry: Some increase in hardness and some loss in ductility will result from skin passing.
3.7
lot
up to a specified quantity of steel sheet of the same designation rolled to the same thickness and surface
condition
4 Dimensions
4.1 Hot-rolled twin-roll cast steel sheet is commonly produced in thicknesses from 0,7 mm to 2,0 mm
inclusive and in widths of up to 2 000 mm maximum in coils and cut lengths.
4.2 Hot-rolled twin-roll cast steel sheet less than 600 mm wide, slit from wide sheet, is considered as
sheet.
5 Conditions of manufacture
5.1 Steelmaking
Unless otherwise agreed by the interested part
...