Last spring I replaced the chainplates on our 1982 Crealock 37.Upon removal we thoroughly inspected the old plates including a dye test.The old plates looked and tested fine,no cracks and no corrosion.Since I had no further use for them I gave the old plates to my friend who is a metal shop instructor at a vocational high school
Yesterday my friend called me to tell me that he had attempted to cut one of the old chainplates with a hydraulic shear for a project. The metal crumbled like an old cookie rather that shear.He tried again with another plate and that too crumbled.
We can only think that 20 plus years of weathering and stress has led to some molecular or crystalline changes in the metal.
The lesson being that even though the plates may appear sound and strong the prudent thing to do is replace over time.Lesson learned.
Dianne and Chuck Burke S/V NiftyNickers C37 #139