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1. standard of galvanized steel pipes: gb, din bs 1387 asme, ansi api, jis, en 2. grade of galvanized steel pipes : a53-a369, q235, q345, q195, q215 20g, a106b sphc, 08al, 08f, hg5, df08, m 3. thickness of galvanized steel pipes: 0.8 - 15 mm 4. outer diameter of galvanized steel pipes: 21.5 - 219 mm...
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