本采购规范涵盖具有均匀矩形横截面的螺旋缠绕式扣环，扣环由耐腐蚀和耐热时效硬化铁基合金制成，其类型在统一编号系统UNS S66286下确定，工作强化，并在室温下热处理至185至240 ksi的抗拉强度。

This procurement specification covers retaining rings of the spiral wound type with uniform rectangular cross-section, made of a corrosion and heat resistant age hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286, work strengthened and heat treated to a tensile strength of 185 to 240 ksi at room temperature.