本规范涵盖了飞机质量的低合金钢板材、带材和板材。主要用于需要焊接和中等机械性能的场合。在0.125英寸以下的截面要求最小抗拉强度为160000 psi（1105 MPa）的情况下，广泛使用薄板和带材。（3.12 mm）厚，在较厚的厚度中，强度按比例降低。

This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate. Primarily for use where welding and moderate mechanical properties are required. Sheet and strip are extensively used where minimum tensile strength of 160,000 psi (1105 MPa) is required in sections up to 0.125 in. (3.12 mm) thick and proportionately lower strength in heavier thicknesses.