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Welded & semit na-enweghị isi
Wedded & akara akara dị iche iche na alloy steel, carbon ígwè, cuplel, duplex, super duplex na ígwè carbon, igwe na-enweghị obere carbon. Dabere na ASTM-106, API 5 L, ASTM A53 Grade A-333, ASTM A-334, ASTM A-335, BS361, ASTM A-325, ASTM A-325, ASTM A-325, ASTM A-325, ASTMAD ) Erw, Hsaw, Hsaw Dị ka API 5L, ASTM A53 A53, ASTM A671 / 672, ASTM A-312, BS1387, DRA 24 ...
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