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5% stainless by weight is going to add quite a decent chunk to the costs...

I'm sure the governments buying bridges don't care, but 5% increased cost for a multiple in longevity seems like a good investment.

At least where I live the government is happy to spend a million euros every year to postpone a five million one time cost.

would more probably be around 15-20% extra price because of the relative price of stainless