... enterprise,whose subordinate is Shanghai changjia caigang sandwich board Co., Ltd and Shanghai gongze steel structure Co., Ltd. We major in metal ... bus station, dock, gas station, and processing workshops, trading market, gymnasium, super market, etc.2. steel roof ... free.4.Features of corrugated roofing: 1. Excellent waterproof performance, light weight, high strength, anti-corrosive. 2. Classical ...