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ChangZeng 1 inch threaded steel pipe Shanghai ChangZeng Metal Co., Ltd. aims to provide global customers with innovative and practical products, such as 1 inch threaded steel pipe. We have always attached great importance to product R&D since establishment and have poured into a tremendous investment, both time and money. We have introduced advanced technologies and equipment as well as first-class designers and technicians with which we are highly capable of creating a product that can effectively solve customers' needs. automotive steel suppliers,aluminized steel coil,stainless steel sheet specifications.