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焊接钢管、镀锌钢管内外径、壁厚尺寸(国标)序号型号规格(寸)外径()内径()壁厚()加厚钢管()1SC155/821.2515.752.752SC203/426.7521.252.753SC25133.50273.2544SC325/442.2535.753.2545SC403/248413.254.256SC50260533.54.57SC705/275.50683.54.58SC80388.5080.5044.759SC10041141064510SC15061651564.55.5