(Bloomberg) -- Supply Lines is a daily newsletter that tracks trade and supply chains disrupted by the pandemic. Sign up here.The steel industry is booming like never before as the global economy recovers from the pandemic, and the ripple effects are being felt by everyone from home builders to appliance makers.Demand is so frenzied that U.S. mills have stopped taking orders from customers in recent weeks, according to Dan DeMare, director of sales at Heidtman Steel Products Inc. DeMare said the