API 5CT/API 5L/ISO9001 manufacture of Seamless steel pipes forautomotive axle housing[ASTM 1345,ASTM 5140,41Gr4] API 5CT/API 5L/ISO9001 manufacture of Seamless low and medium pressure boiler pipesSeamless low and medium pressure boiler pipes Technical standard:1) ASTM A3352) ASTM 2133) API 5L4)API 5CT5) EN 102106) GB/T8163-19997)ISO 9001 Grades:1>J55,K55,N80,P110,L802>ASTM A106 GR.A ,A106 Gr.B, ...