... long service life light steel structure house Products specification:1.Construction Area: 17000 M2 2. Main frame: welded H ... :Purlin (secondary frame):Main frame:Qingdao Baoduo Steel Structure Co., LTD. produce light and heavy steel structure buildings for ... warehouses, workshops, high rise steel buildings, storages,garages, hangares, stairs, welded steel parts, steel frame of cement buildings, chicken ...