热镀锌钢 - 特征

附录 A
（标准）
钢等级对镀锌表面的影响

A.1 镀层厚度

对于 I II 等级的钢，它的厚度很难超过 NF A91-121 标准中最小的中等厚度。

对于第 III 等级的钢，在镀锌处理情况下，它的厚度在 120 到 200um 之间。对于某些形状复杂或质量较大的型号，需要更长时间热浸的，厚度可以超过 200um。

A.2 表面

对于第 I 等级的钢，表面是光滑闪亮的。

对于第 II 等级的钢，当硅和磷接近最大极限值时，可能会出现无抗腐蚀性的大理岩毛糙表面。

对于第 III 等级的钢，表面一般很均匀，但是开端比第 I、II 等级的钢要稍微粗糙一些。可能会出现无抗腐蚀性的大理岩纹毛糙灰色区域。

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SOMMAIRE

TABLE DES MATIÈRES

: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of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.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.

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