... stainless steel tube GRADE: TP304, TP304L, TP316L, TP321, TP310S W. T: SCH5S, SCH10S, SCH40S, SCH80S. We are the manufactory of stainless steel ... preparation machines, ect.Testing machinesUltrasonic testing machine, Eddy current testing machine, Mechanics test, Direct-reading Spectrum ... Inter-granular corrosion testing lab, Hydraulic testing machine, ect.certificatesISO 9001, Manufacture License of ...