مقدمة
ايزو (المنظمة الدولية للمقاييس) هو تحالف عالمي لهيئات المعايير الوطنية (الهيئات الأعضاء في منظمة الأيزو). عادة ما يتم تطوير المعايير الدولية من خلال اللجان الفنية ISO. يحق لكل مؤسسة عضو مهتمة بموضوع تم تشكيل لجنة فنية له أن تكون ممثلة في تلك اللجنة. وتشارك أيضًا في هذا العمل المنظمات الحكومية الدولية وغير الحكومية المتعاونة مع ISO. تعمل ISO بشكل وثيق مع اللجنة الكهروتقنية الدولية (اللجنة الانتخابية المستقلة) في جميع المسائل المتعلقة بالتوحيد الكهربائي.

يتم وصف الإجراءات المستخدمة لتطوير هذه الوثيقة وتلك المستخدمة لمزيد من الصيانة في الجزء 1 لتوجيهات ISO/IEC. بخاصة, وينبغي إيلاء الاهتمام لمعايير الموافقة المختلفة المطلوبة لأنواع مختلفة من وثائق ISO. تمت صياغة هذه الوثيقة وفقًا لقواعد التحرير الخاصة بجزء توجيه ISO/IEC 2 (راجع iso.org/directives).

يرجى ملاحظة أن بعض عناصر هذه الوثيقة قد تكون خاضعة لحقوق براءات الاختراع. ISO ليست مسؤولة عن تحديد أي أو كل براءات الاختراع هذه. 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 (راجع iso.org/patents).

ايزو 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.

للحصول على وصف لمعنى مصطلحات وتعابير ISO المحددة المتعلقة بتقييم المطابقة, and for information on ISO’s compliance with WTO principles in Technical Barriers to Trade (TBT), please see the following URL: مقدمة – Supplementary information

اللجنة المسؤولة عن هذه الوثيقة هي ISO/TC 17, Steel, اللجنة الفرعية SC 12, Flat Rolled Products for Continuous rolling mills.

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

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

1 يتراوح
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 المراجع المعيارية
All or part of the following documents are referred to normatively in this document and are required for their application. للمراجع المؤرخة, تنطبق النسخة المذكورة فقط. للمراجع غير المؤرخة, نسخة جديدة من المرجع (بما في ذلك أي مراجعات) ينطبق.

ايزو 2178, Non-magnetic coatings on magnetic substrates – قياس سمك الطلاء – Magnetic methods

ايزو 3497, metallic coatings – قياس سمك الطلاء – X-ray spectroscopy

ايزو 6892-1, Metallic materials – Tensile testing – جزء 1: Test methods at room temperature

ايزو 7438, Metallic materials – اختبار الانحناء

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

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

3 المصطلحات والتعاريف
لأغراض هذه الوثيقة, تنطبق المصطلحات والتعاريف التالية.

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

ملحوظة 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; لكن, 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

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

ايزو 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

ملحوظة 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

ايزو 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

ملحوظة 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

قسم المعلومات القياسية فقط هو العام. لرؤية المحتوى كاملا, تحتاج إلى شراء المعيار من خلال القنوات الرسمية.