Official Answer
Answer
Inconel X-750 (UNS N07750) is a nickel-chromium alloy made precipitation-hardenable by additions of Al and Ti. In subsea environments, it provides exceptional resistance to chloride-ion stress corrosion cracking (SCC) and hydrogen embrittlement. For spiral rings, it is typically heat-treated to the No. 1 Temper or Spring Temper followed by aging. The aging process creates $\gamma'$ ($Ni_3(Al, Ti)$) precipitates which pin dislocations, providing a high shear strength $\tau_{shear} \approx 550-700$ MPa even at cryogenic or elevated temperatures ($700^\circ C$). This stability is vital for preventing 'ring-out' failures in high-pressure blowout preventers (BOPs).
