Quiet door latch

I'm not familiar with how your latch is made but the one I have and many others on here have is the Trimark door latch. The latch itself is made from a Zinc alloy some call it pot metal which is very weak and breaks easily especially when constantly slamming the door. I have replaced or repaired mine 3 times over the years. The last repair was adding a steel plate to join the broken pieces together and it is holding up well. If the latch itself is nonmagnetic it is made from this zinc alloy and not steel.