In reply to roblo:
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> buy the petzl ones for a bit more, be safe and not waste your money
That’s a very easy thing to say in hindsight the karabiners were presumably bought from a normal gear shop and they are certainly a reputable make, other than a personal recommendation or warning (which the o.p. is giving here) you often have to just trust that gear is up to the job
If they had been bought in the UK I would take them back for a refund
To richpaulcol
Are you sure that they are not just “gritted up” ? the Dolomites can be a very dry dusty place, give them a good clean and a light oil see if that helps