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ASTM A815 WP31803 / WPS32750 / S32760 Con. Giảm mông hàn phù hợp BW B16.92020-06-02 17:33:16 |
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ASTM A860 WPHY 60 Mối nối hàn, Bình đẳng Tee 1 "SCH40 BW B16.92020-06-02 17:33:16 |