涂漆和相关产品应用前钢材基材的准备——表面清洁度的视觉评估——第3部分：焊缝、切割边缘及其他表面缺陷区域的准备等级

4 Preparation grades

There are three preparation grades for making steel surfaces with imperfections suitable for the application of paints and related products:

P1 Light preparation: minimum preparation considered necessary before application of paint;

P2 Thorough preparation: most imperfections are remedied;

P3 Very thorough preparation: surface is free of significant visible imperfections.

The significance of visible imperfections shall be agreed between relevant parties, depending on the specific application.

Requirements for the preparation grades are given in Table 1.

NOTE 1 It is important that the preparation methods used to achieve these preparation grades are not deleterious to the integrity of the steel surface or welded areas. For example, strong grinding pressure can result in the formation of heat-affected areas on a steel surface, and removal of defects by grinding may leave sharp edges at the edges of the grind pattern.

Annex A gives a correlation between the preparation grades and the corrosivity category of the environment.

NOTE 2 A replica (known as NACE standard RP 0178) shows examples of weld imperfections and certain levels of preparation. It may be obtained from NACE International, P.O. Box 218340, Houston, Texas 77218-8340, USA.

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Terminology

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IEC publications prepared by the same Technical Committee

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NORME INTERNATIONALE INTERNATIONAL STANDARD МЕЖДУНАРОДНЫЙ СТАНДАРТ

50(715) © IEC:1996

CONTENTS

:current

Foreword

This document (EN 10216-3:2002) has been prepared by Technical Committee EC/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.

Other Parts of EN 10216 are:

Another European Standard series covering tubes for pressure purposes is:

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

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ISO 657-1 : 1988 (E)

Table 1 — Dimensions and sectional properties of hot-rolled equal-leg angles (concluded)

NOTES

1. Member countries may choose, to be included in their national standards, the sizes which are required to meet their demand.
2. For the angles so chosen, only thicknesses which can be rolled in their mills to meet the demand of the users may be selected from the list of thicknesses corresponding to equal angles in table 1.
3. The sectional area has been calculated using the formula

   S = [l/2 A - l) + 0,214 6 (r_root² - 2r_toe²)] × 1/100

   where
   

   S is the sectional area, in square centimetres;
   

   l is the thickness, in millimetres;
   

   r_root is the root radius, in millimetres;
   

   r_toe is the toe radius, in millimetres;
   

   A is the leg length, in millimetres.

4. Mass is calculated on the basis of density of steel of 7,85 kg/dm³.

   4