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20g鋼管,GB5310,鍋爐管,高壓鍋爐管,20G高壓鍋爐管,低中壓鍋爐管,16mn低中壓鍋爐管,15CrMoG高壓鍋爐管,12CrMoG高壓鍋爐管,GB5310鍋爐管,GB5310高壓鍋爐管,GB3087低中壓鍋爐管