主要用于需要焊接和中等拉伸性能的场合。当壁厚达到0.125英寸时，要求最小抗拉强度达到180000 psi（1240 MPa）时，可使用。（3 mm）且在较厚的厚度中要求相应较低的强度。自1988年4月19日起，SAE航空航天材料部已宣布本规范为“非现行”。因此，建议本规范不适用于新设计。

Primarily for use where welding and moderate tensile properties are required. May be used where minimum tensile strength up to 180,000 psi (1240 MPa) is required for wall thicknesses up to 0.125 in. (3 mm) and proportionately lower strength is required in heavier thicknesses. This specification has been declared "Noncurrent" by the Aerospace Materials Division, SAE, as of 19 April 1988. It is recommended, therefore, that this specification not be specified for new designs.