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A theoretico-experimental method for investigation of hydrogen-temperaturefracture of bimetallic structural elements, operating in hydrogen-containing environmentshas been proposed. It was shown that fracture proceeds by coalescence of pores into acrack with its subsequent growth due to filling it with a gas that forms a high internalpressure. Using the theoretical investigation results a temporal dependence of the crackarea formation and growth at the fusion boundary of 2.25Cr-1Mo steel with an austenitesurfacing. A correctness of the theoretical ideas of the developed method for evaluation ofhydrogen-temperature fracture of bimetals has been proved experimentally. For thispurpose the methods of acoustic emission, ultrasonic testing and metallographic analysishave been used.