Form: This specification covers an aluminium alloy in the form of rolled or forged rings. Application: Primarily for structural applications requiring material with a combination of good strength and resistance to stress-corrosion cracking@ and where good stability is required during machining. Not recommended for fusion welding. Classification: The rings covered by this specification are calssified by type of mechanical stress relief as follows: Type 1 - Stress relieved by stretching (7075-T7351) Type 2 - Stress relieved by compression (7075-T7352) Either type may be supplied@ unless a specific type is ordered.