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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() 1SC155/821.2515.752.75 2SC203/426.7521.252.75 3SC25133.50273.254 4SC325/442.2535.753.254 5SC403/248413.254.25 6SC50260533.54.5 7SC705/275.50683.54.5 8SC80388.5080.5044.75 9SC100411410645 10SC15061651564.55.5