... 5L/ISO9001 manufacture of Seamless low and medium pressure boiler pipes Seamless low and medium pressure boiler pipes Technical standard:1) ASTM ... >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,STPG410STPG42,STPT370,STPT410,STS38,STB30 ...