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About product and suppliers:
        Alibaba.com offers 218,889 standard used products. About 1% of these are steel pipes, 1% are steel sheets, and 1% are valves. 

A wide variety of standard used options are available to you, such as 10#, 20#, and a53(a,b). You can also choose from structure pipe, fluid pipe, and oil pipe. As well as from api, astm, and bs. And whether standard used is erw, hot rolled, or cold drawn. 

There are 218,889 standard used suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of standard used respectively. 

Standard used products are most popular in Mid East, South America, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 48,832 with ISO9001, 24,405 with Other, and 7,014 with ISO14001 certification.