Federal regulators are telling state transportation agencies that the kind of steel used in the Sherman-Minton Bridge at Louisville may be prone to cracks in welds, according to the Engineering News Record. The steel is known as T1 and hasn't ben used in bridged in decades, but the feds are advising inspectors to pay particular attention to cracks in certain areas.
I'm not versed on types of steel or particular types of welding, but I still found the article interesting. Check it out.
One of the bridges at Cincinnati got such an inspection this week because of the use of T1 steel.
Cincinnati is the latest city hoping improvements to the Panama Canal lead to more cargo moving by river into and out of its area.