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About product and suppliers:
        Alibaba.com offers 6,415 30mm diameter steel pipe products. About 70% of these are steel pipes, 23% are stainless steel pipes, and 1% are steel channels. 

A wide variety of 30mm diameter steel pipe options are available to you, such as 10cr9mo1vnb, 10#, and a53(a,b). You can also choose from astm, api, and jis. As well as from ce, bsi, and ul. And whether 30mm diameter steel pipe is fluid pipe, structure pipe, or boiler pipe. 

There are 6,353 30mm diameter steel pipe suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Australia, and India, which supply 99%, 1%, and 1% of 30mm diameter steel pipe respectively. 

0mm diameter steel pipe products are most popular in Southeast Asia, Mid East, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 2,126 with ISO9001, 624 with Other, and 126 with ISO14001 certification.