标 准 号:DIN EN 755-7-1998 简体中文标题:铝和铝合金.挤压棒材、管材和型材.第7部分:无缝管材.尺寸和形状公差 繁体中文标题:铝和铝合金.挤压棒材、管材和型材.第7部分:无缝管材.尺寸和形状公差 English Name:Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 7: Seamless tubes, tolerances on dimensions and form;