Official Answer
Answer
Stress Corrosion Cracking (SCC) is the sudden failure of a ductile material when subjected to a tensile stress in a corrosive environment (like seawater). For 302/304 stainless steel spiral rings, chloride ions penetrate the passive layer, and the residual stresses from the coiling process provide the energy for crack propagation. The ring may literally 'snap' while sitting idle in the groove. Troubleshooting involves looking for 'branching' cracks under a microscope. To prevent SCC, engineers should specify 316 Stainless Steel (for its Molybdenum content) or, for even higher risk environments, nickel-based alloys like Inconel 625, and ensure the rings are properly passivated per AMS 2700.
