本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。本规范规定了通常未规定但可能在锻造镍、钴和铁合金产品中出现微量元素的最大允许限值。本规范提供的控制通常用于高度- 应力旋转部件，如涡轮盘，需要控制微量元素以维持高温拉伸、应力断裂、蠕变和低周疲劳性能，但使用不限于此类应用。本规范仅适用于图纸、采购订单或补充材料规范或材料规范的其他文件规定的选定应用。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.This specification establishes maximum permissible limits for elements not normally specified but which may occur in trace amounts in wrought nickel, cobalt, and iron alloy products.Control provided by this specification has been used typically for highly-stressed rotating parts, such as turbine discs, where control of trace elements is required to maitain elevated-temperature tensile, stress-rupture, creep, and low-cycle fatigue properties, but usage is not limited to such applications.It is intended that this specification be invoked only for selected applications by stipulation on drawings, purchase orders, or other documentation supplementing the material specification, or in material specifications.