... to 400mm*400mm, thickness 0.6mm - 12mm 3) Rectangular steel pipe:Size from 10mm*20mm to 200mm*400mm,thickness 0.6mm-12mm4 ... ) spiral steel pipe: Size from 219mm to 1620mm, thickness from 4.5mm to 12mm5) seamless steel pipe: Size from 21mm to 820mm,thickness ... from 2.5mm to 30mm6) Angle steel: Size from 2# to 20#, thickness ...