Coil springs in primary water

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DP

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Would a coil spring loose tension over time (say 10 years) through abrasion from water flow across it?
 
I can imagine it might, if there were the slightest corrosion going on. I don't suppose it has reduced in metal thickness but the material may well have residual stresses in it, which would be expected to cause very small cracks over time. ("Stress corrosion cracking"). That would obviously relieve the stresses, and weaken the material.
What's the application?
 
Spring sits in a manifold acting on a spindle. When boiler idle, spindle should eject. Demand causes spindle to retract (compressing spring). At the end of the demand, the spring has to push out the spindle. It did not. Tried 'stretching' the spring. Made no difference- spring tension failed to eject spring. Fitted a new spring. Works every time.
 
Heating and cooling cycles, annealed it over time :?:
 
Steen annealing temps are several hundred C. My money's on little cracks.
 

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