ISO 7778:2014 鉄鋼製品の厚さ方向の特性 | ページ 2

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.

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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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.

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.

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.

Bibliography