GB / T 5310-2017 20G, 20mng, 25mng, etc
Asme Sate 106 gr. B, gr. I
Asme Sa 210 gr. A1, gr. I
Asme Sata 213 T11, T12, T22, etc
Asme Savad 335 P11, p12, p22, etc
Semiless steel tubes mo le maualuga-mamafa bilers
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