Aluminium and aluminium alloys. cold drawn rod bar and tube. part 8 : porthole tubes, tolerances on dimensions and form.
铝及铝合金。 冷拔棒材条材和管材。第8部分：多孔拉拔管尺寸和形状公差。
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English Name:Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 8: Porthole tubes, tolerances on dimensions and form;
简体中文标题：铝和铝合金。挤压棒材、管材和型材。第8部分：带孔管材。尺寸和形状公差。
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The ageing-stress relaxation sizing and forming processes have been successfully used to form complex skin panels to typical aircraft tolerances with many advantages compared to other methods.