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About product and suppliers:
        Alibaba.com offers 19,096 ad standard products. About 1% of these are flanges, 1% are steel pipes. 

A wide variety of ad standard options are available to you, such as astm, din, and bs. You can also choose from erw, hot rolled, and cold rolled. As well as from free samples, paid samples. 

There are 19,096 ad standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of ad standard respectively. 

Ad standard products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 3,932 with ISO9001, 3,553 with Other, and 309 with ISO14001 certification.