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About product and suppliers:
        Alibaba.com offers 212,189 standard used products. About 1% of these are valves, 1% are steel pipes, and 1% are electrical wires. 

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 gb. And whether standard used is erw, hot rolled, or cold drawn. 

There are 212,189 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, Domestic Market, and North America. 

You can ensure product safety by selecting from certified suppliers, including 50,274 with ISO9001, 24,912 with Other, and 6,946 with ISO14001 certification.