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Welded steel pipe

2018-06-12View Original

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Does anyone know how ASTM-welded steel pipes are made?
Reply #22018-06-13
It is made in accordance with Chinese standards. . . . Then a different mark was sprayed on, and the standards for writing the warranty note were different. . .
Reply #32018-06-14
Thank you; relevant descriptions can be found in the national standard GB50235

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