No, this is mistaken. The large steel mills are closing across Europe because steel recycling has gotten much better - the old mills closing are generally blast furnaces, which are used for making new steel out of ore - while the mills that are now more common are arc furnances, used for recycling scrap steel, which is a more advanced process than it once was. And blast furnaces tend to be very polluting, which is a major reason why wealthy countries prefer not to have them and simply buy new steel from elsewhere.