There are two types of steel structure residential. One kind is the light steel structure residential, mostly one to two layer structure, very mature abroad. There are a lot of such housing plant in Japan, North America and Australia. Another kind is high-rise steel structure residential. For more than a decade, especially in our country, some large steel structure production and processing enterprises, and some steel mills, including our scientific research personnel and teachers in Colleges and universities, are eagerly in the research of high-rise steel structure housing. http://www.andysteelstructure.com/steel-structure-factory.htm