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About product and suppliers:
        Alibaba.com offers 38,531 40mm steel tube products. About 39% of these are steel pipes, 26% are stainless steel pipes. 

A wide variety of 40mm steel tube options are available to you, such as 10#, cr5mo, and 20#. You can also choose from astm, api, and jis. As well as from structure pipe, fluid pipe, and oil pipe. And whether 40mm steel tube is erw, cold rolled, or hot rolled. 

There are 38,492 40mm steel tube suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Japan, and India, which supply 99%, 1%, and 1% of 40mm steel tube respectively. 

0mm steel tube products are most popular in Southeast Asia, Domestic Market, and South America. 

You can ensure product safety by selecting from certified suppliers, including 12,747 with ISO9001, 5,066 with Other, and 1,418 with ISO14001 certification.