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About product and suppliers:
        Alibaba.com offers 13,061 si standard products. About 1% of these are steel pipes. 

A wide variety of si standard options are available to you, such as 10#, 16mn, and 20#. You can also choose from api, astm, and din. As well as from ce, ul. And whether si standard is erw, hot rolled, or cold drawn. 

There are 13,061 si standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of si standard respectively. 

Si standard products are most popular in North America, Mid East, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 3,760 with ISO9001, 1,361 with Other, and 746 with ISO14001 certification.