1.Seamless Steel Fluid Pipe 2.certificate: GB API JIS ASTM 3.thickness:2-60mm 4.OD:20-667mm 5.material:15-45 ... 20mm - 677mm(1/2”~28”) with thickness of 2~60mm(4) Standard ; a.ASTM A106 GR B , ASTM A53 GR B ... .DIN ST 45-8, DIN ST 42-2, st 45-4, st52.4 (5) Usage: boiler use, water transport, building, machinery, traffic ...