Abstract
The paper presents the results of macro and microstructure testing, hardness measurements and tensile test of submerged arc welded joints of composite pipes made of two grades of steel with X6CrNi18-10 steel flat bars intended for operation in elevated temperature. The outer part of the composite pipe is made of Sandvik 3R12 steel (grade ASME 304L/SA) and has austenitic microstructure, whereas the inner pipe – of Sandvik 4L7 steel (grade ASME SA-210A1) and has ferritic pearlitic microstructure. The results of the tests were used as a base to elaborate the Welding Procedure Specification allowing to obtain high quality joints with correct structure and high mechanical properties.
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