The world’s largest stainless steel roof is being built at the New Doha International Airport in Qatar. Shaped in a billowing, it symbolizes the Gulf emirate’s aspiration to be a gateway to the world. The roof of the passenger terminal is made of a Moly grade lean duplex stainless steel. When finished, the New Doha International Airport NDIA will be about two thirds the size of Doha and 12 times larger than the current Doha international airport. It is expected that the new airport will generate additional commercial activity. Contrarian Metal Resources turned to Pennsylvania, US-based ATI Allegheny Ludlum to supply the material. The company’s AL 2003 lean duplex stainless steel (1.8% Mo, 21.5% Cr, 0.17% N, 3.7% Ni) turned out to have the right properties for the task in hand. AL 2003 is the only lean duplex grade that contains moly in significant amounts. In this grade, moly is an indispensable ingredient in combating corrosion. This is vital in a region notorious for its hot, humid and saline atmosphere- especially as the airport site is virtually surrounded by sea.