... .3 4.SGS inspection 5.Mill supply 1.Commodity NameSpiral steel pipe2.StandardSY/T5037,SY/T5040,ASTMA252,EN10217,EN10219,GB/T9711 ... ,X70,X80 etc11.UsageFor linepipe in petroleum and natural gas , water and gas, mineral slurry. Also for chemical industry, building structure ... .CertificatesAPI 5L PSL1,PSL2 , API 5CT, ISO ,CE Large Size SSAW Spiral Seam Steel Pipe