Seamless tubes GRADE: TP304, TP304L, TP316L, TP321, TP310S W. T: SCH5S, SCH10S, SCH40S, SCH80S. We are the manufactory of stainless steel seamless pipes, specialized ... test, Direct-reading Spectrum Instrument, Inter-granular corrosion testing lab, Hydraulic testing machine, ect.certificatesISO 9001, Manufacture License of Special Equipment ...