ISO 7778:2014
(Main)Through-thickness characteristics for steel products
Through-thickness characteristics for steel products
ISO 7778:2014 specifies the criteria for through-thickness reduction of area properties specified in the direction of thickness perpendicular to the surface. It also specifies the test conditions by which conformance to the specified criteria is evaluated. ISO 7778:2014 applies to fully killed steel with a specified minimum yield strength or proof strength ≤960 MPa and supplied as plates, wide flats, or sections of thickness from 15 mm to 400 mm.
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INTERNATIONAL ISO
STANDARD 7778
Second edition
2014-03-01
Through-thickness characteristics for
steel products
Caractéristiques garanties dans le sens de l’épaisseur pour produits
en acier
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Requirements . 1
4 Designation . 2
5 Number and selection of test pieces . 2
5.1 Test unit for flat products . 2
5.2 Test unit for sections . 2
5.3 Sampling . 2
6 Test methods . 3
6.1 Test pieces . 3
6.2 Tensile test . 3
Bibliography . 7
Foreword
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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
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The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 3, Steels for structural
purposes.
This second edition cancels and replaces the first edition (ISO 7778:1983), which has been technically
revised.
iv © ISO 2014 – All rights reserved
Introduction
Steel products as normally manufactured generally exhibit deformation properties in the direction
perpendicular to the surface of the product, which are different from those obtained in the direction
of the surface. It is, however, possible to improve these deformation properties by taking particular
precautions when the steel is manufactured. Experience has shown that measurement of the value for
reduction of area, measured by means of a tensile test piece sampled in the direction of thickness of the
product perpendicular to its surface, is the best way to characterize these properties.
However, the choice of one quality of steel exhibiting properties of this nature does not necessarily
ensure the safety of a structure of which certain components are stressed perpendicular to their
surface. Precautions should be taken both at the design and fabrication stage, and more particularly
during welding, so as to minimize stresses in the through-thickness direction.
INTERNATIONAL STANDARD ISO 7778:2014(E)
Through-thickness characteristics for steel products
1 Scope
This International Standard specifies the criteria for through-thickness reduction of area properties
specified in the direction of thickness perpendicular to the surface. This International Standard also
specifies the test conditions by which conformance to the specified criteria is evaluated.
This International Standard applies to fully killed steel with a specified minimum yield strength or proof
strength ≤960 MPa and supplied as plates, wide flats, or sections of thickness from 15 mm to 400 mm.
The application of this International Standard to products <15 mm or >400 mm or having minimum
specified yield strengths or proof strengths >960 MPa will be the subject of agreement when ordering.
The requirements of this International Standard supplement other International Standards that specify
the qualities of products (plate, wide flats, and sections).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing
ISO 404, Steel and steel products — General technical delivery requirements
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 17577:2006, Steel — Ultrasonic testing for steel flat products of thickness equal to or greater than 6
mm
3 Requirements
Table 1 gives the minimum average values and the minimum individual values for the reduction of area,
whic
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