seamless steel tube pass the API 5CT/API 5L/ISO9001 quality management system certification.Obtain qualifications,use API emblem Technical standard:1) ASTM A532) ASTM A1063) API 5L4)API 5CT5) EN 102106) GB/T8163-19997)ISO 9001Grades:1)J55,K55,N80,P110,L802)ASTM A106 GR.A ,A106 Gr.B,A53 Gr.A,A53 Gr.B,ASTM ,A179-C,A214-C,A192,A226,A315-B,A178-C,A210-A-13)STFA410,STB340,STB410,STPG370STPG38, ...
