This paper describes a continuation of previously reported cyclic heating tests of austenitic and ferritic piping and welds, representing the main steam piping installed at Sewaren Generating Station. In the current test, a section made up of these materials was subjected to thermal cycling from room temperature to 1100 F, and from atmospheric pressure to the operating pressure of 1500 psi. The heating and cooling rates were somewhat more severe than are experienced during regular starting and shutting-down conditions in the actual piping systems. The results show that 100 cycles did not produce any cracking. It is proposed to continue the test to destruction by further cycling and the addition of external bending forces.

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