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About product and suppliers:
        Alibaba.com offers 14,950,524 us standard products. About 1% of these are steel pipes, 1% are flanges. 

A wide variety of us standard options are available to you, such as api, astm, and gb. You can also choose from 10#, 20#, and a53(a,b). As well as from erw, hot rolled, and cold rolled. And whether us standard is round, or square. 

There are 14,950,524 us standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of us standard respectively. 

Us standard products are most popular in Mid East, North America, and South America. 

You can ensure product safety by selecting from certified suppliers, including 3,197,338 with ISO9001, 1,928,563 with Other, and 477,216 with ISO/TS16949 certification.