introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

The procedures used to develop this document and those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (see iso.org/directives).

Please note that certain elements of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

ISO 4998-2014 “Continuous hot-dip galvanized and zinc-ferro-coated carbon steel plates for Structural quality”

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

For a description of the meaning of specific ISO terms and expressions related to conformity assessment, and for information on ISO’s compliance with WTO principles in Technical Barriers to Trade (TBT), please see the following URL: Foreword – Supplementary information

The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 12, Flat Rolled Products for Continuous rolling mills.

The sixth edition cancels and replaces the technically revised fifth edition (ISO 4998:2011).

ISO 4998-2014 “Continuous hot-dip galvanized and zinc-ferro-coated carbon steel plates for Structural quality”

1 Range
1.1 This international standard specifies the structural quality of continuous hot-dip galvanized and zinc-iron alloy coated carbon steel plates.

1.2 The product is suitable for applications where the importance of corrosion resistance cannot be overstated.

1.3 Steel plates are available in a variety of grades, coating quality, ordering conditions and surface treatment.

1.4 This International standard does not include steels classified as commercial or tensile quality by ISO 3575[2].

2 Normative references
All or part of the following documents are referred to normatively in this document and are required for their application. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 2178, Non-magnetic coatings on magnetic substrates – Measurement of coating thickness – Magnetic methods

ISO 3497, metallic coatings – Measurement of coating thickness – X-ray spectroscopy

ISO 6892-1, Metallic materials – Tensile testing – Part 1: Test methods at room temperature

ISO 7438, Metallic materials – Bending test

ISO 16163:2012, Continuous hot-dip coated steel plate products. Size and shape tolerances

ISO 4998-2014 “Continuous hot-dip galvanized and zinc-ferro-coated carbon steel plates for Structural quality”

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Continuous hot dip galvanized steel plate

Product obtained by hot dip coating of cold reduced sheet coil or hot rolled descaling sheet coil on a continuous galvanizing line

3.2 Common Coating

A coating formed as a result of the unrestricted growth of zinc crystals during normal solidification

Note 1: This coating has a metallic luster and is of the type commonly used for a variety of applications. It can be supplied as S or N; However, its appearance can be varied and not suitable for decorative painting.

3.3 Minimal glitter coating

A coating obtained by limiting normal flash formation during zinc solidification

Note 1: The surface appearance of the product may lack uniformity within or between coils.

ISO 4998-2014 “Continuous hot-dip galvanized and zinc-ferro-coated carbon steel plates for Structural quality”

3.4 Smooth surface treatment

Smooth coating produced by skin treatment of coating materials to achieve improved surface conditions compared to ordinary coated products

3.5 Zinc-iron alloy coating

A coating produced by machining galvanized steel plates so that the coating formed on the base material consists of a zinc-iron alloy

Note 1: The product is named ZF, has no glitter, is usually dull in appearance, and for some applications can be painted immediately without further treatment in addition to normal cleaning. Zinc-iron alloy coatings are powdery during heavy molding.

3.6 Differentiated Coatings

A coating that has a specified coating quality name on one surface and a different coating quality name on another surface

ISO 4998-2014 “Continuous hot-dip galvanized and zinc-ferro-coated carbon steel plates for Structural quality”

3.7 Skin Pass

Light cold rolling of galvanized steel sheet

Note 1: The purpose of the skin channel is to produce a higher degree of surface smoothness, thereby improving the appearance of the surface. Skin channels can also temporarily reduce surface conditions called Luder’s Lines or grooves that occur during the manufacturing of finished parts. Skin channels can also control and improve flatness. Skin passing results in increased hardness and loss of ductility.

3.8 A lot

Plates of the same grade under 50 tons are rolled to the same thickness and coating conditions

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.