i would use your body heat to warm the steel up if where too cold because all steel becomes brittle if it gets cold enough.

as far as heat is concerned just dont let it get to hot.i dont think the sun under normal conditions will get it hot enough.jerry has said INFI would have to reach up to 900 degrees to ruin its temper.i'm sure SR77 & SR101 temps would be lower.

if you dropped it in boiling water it would be fine if you took it right out.if you left it in there for a while you may run into a problem.

while i'm sure there are technical answers that only someone like dan or jerry could answer some of it is common sense.