1.1形式本规范涵盖标称厚度为0.250至2.000英寸（6.35至50.80毫米）、横截面积为32平方英寸（206平方厘米）（含32平方英寸）的挤压棒材、棒材和型材形式的铝合金（见8.5）。1.2应用这些挤压材料通常用于需要高拉伸财产、中等疲劳强度组合的结构应用，抗应力腐蚀性和良好的断裂韧性，但用途不限于此类应用。

1.1 FormThis specification covers an aluminum alloy in the form of extruded bars, rods, and profiles 0.250 to 2.000.inches (6.35 to 50.80 mm) in nominal thickness and up to 32 in2 (206 cm2), inclusive, in cross-sectional area (see 8.5).1.2 ApplicationThese extrusions have been used typically for structural applications requiring a combination of high tensile properties, moderate fatigue strength, stress-corrosion resistance, and good fracture toughness, but usage is not limited to such applications.