ISO 20805:2017 pdf download

ISO 20805:2017 pdf download.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