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About product and suppliers:
        Alibaba.com offers 2,997 portal frame steel structure products. About 56% of these are steel structures, 12% are warehouses, and 4% are metal building materials. 

A wide variety of portal frame steel structure options are available to you, such as aisi, gb, and astm. You can also choose from free samples, paid samples. 

There are 2,919 portal frame steel structure suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Turkey, and Singapore, which supply 99%, 1%, and 1% of portal frame steel structure respectively. 

Portal frame steel structure products are most popular in Africa, Oceania, and South America. 

You can ensure product safety by selecting from certified suppliers, including 1,063 with ISO9001, 591 with Other, and 304 with OHSAS18001 certification.