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About product and suppliers:
        Alibaba.com offers 288,563 black steel pipe products. About 29% of these are steel pipes, 1% are pipe fittings, and 1% are plastic tubes. 

A wide variety of black steel pipe options are available to you, such as q235, 10#, and 20#. You can also choose from api, jis, and gb. As well as from structure pipe, fluid pipe, and oil pipe. And whether black steel pipe is ce, bsi, or ul. 

There are 288,500 black steel pipe suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Singapore, and Pakistan, which supply 99%, 1%, and 1% of black steel pipe respectively. 

Black steel pipe products are most popular in South America, Southeast Asia, and North America. 

You can ensure product safety by selecting from certified suppliers, including 64,730 with ISO9001, 39,383 with Other, and 12,318 with ISO14001 certification.