Seatpost clamp bolts

Having woken up at 5 for my morning ride, i tried to adjust my seat height and, loosening the seatpost clamp bolt, the damn thing sheared off in my hand.  I'm now sitting here, annoyed.  I'm pretty sure that I'm not overtightening them, it seems that they are corroding due to their exposed position on the bike. 

Anyone got any tips?  I guess a higher grade of steel might help - stainless perhaps rather than the monkey metal that some are made of.  And, is this just me?

Probably co-incidence, but my old bike, a Gios with a Campagnolo Italian-style clamp disintegrated on Tuesday.

 

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