Seamless pipe ASTM A106GrB A53GrB A179,API5IGrB ST42,ST37 ... S: 1.5 - 8mm2) Application: furnace tube for petroleum refining factory, heat exchanger and forpipeline3) Material: 10#, 20#, 35#, 45#, ... , CT test.Our products'brief Instruction:Cold draw seamless steel tube/pipe ASTM/ASME: A106, A53, A179, A192, A213 ... ST45/ST52) DIN17200( 40Cr/34CrMo4/CK45) API: Line Pipe( GR.B/X42/X46/X52/X60) Tubing( J55/ ...