BS EN 755-7:2016规定了铝和铝的尺寸和形状公差 外径（外径）为8 mm至450 mm（圆管、， 参见图1），或横截面包含在10 mm至 350 mm（圆管除外，见图2），以直线长度供应。本欧洲标准仅适用于采用无缝模具/心轴法生产的管材 挤压。本标准仅适用于一般工程应用的挤压无缝管。 本部分中使用的回火名称符合EN 515。本欧洲标准不适用于:通过分流孔/桥接法（EN 755-8）生产的挤压管、以盘管形式交付的管（EN 13957）、按长度切割的盘管（EN 13957）。交叉引用:EN 755-1:2016EN 515EN 755-8EN 13957购买本文件时可获得的所有现行修订均包含在购买本文件中。

BS EN 755-7:2016 specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded seamless tubes with an outside diameter (OD) from 8 mm to 450 mm (round tube, see Figure 1) or with a cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube, see Figure 2), supplied in straight lengths.This European Standard only applies to tube produced by the seamless die/mandrel method of extrusion. This standard applies to extruded seamless tube for general engineering applications only.The temper designations used in this part are according to EN 515.This European Standard does not apply to:extruded tubes produced by porthole/bridge method (EN 755-8),tubes delivered in coils (EN 13957),coiled tubes cut to length (EN 13957).Cross References:EN 755-1:2016EN 515EN 755-8EN 13957All current amendments available at time of purchase are included with the purchase of this document.