Large diameter thick wall steel pipe 1)Standard: AISI,ASTM,GB,DIN,JIS 2) ... 0.5mm---80mm 3)Diameter 10mm-1000mm Large diameter thick wall steel pipe Seamless steel pipes 1)Standard: AISI,ASTM,GB ... .410Ni141.5637SEW680(20Mn23A1) A333-8A334-8X8Ni91.5662SEW680 large diameter thick wall steel pipe 24 inch SCH80