Investigation on Hydrogen Embrittlement of Steels for Hydrogen Steel Flasks and Pressure Vessels. Final Report, November 1, 1980-November 30, 1982

摘要

Investigations were made on the hydrogen embrittlement of chrome-molybdenum alloyed pressure-vessel steels by using hollow specimens in tensile tests with constant strain rates. For comparison, tests were carried out with nitrogen, too. At first the influence of strain rate was examined in the range between 3.5 x 10 exp -6 s exp -1 and 8.3 x 10 exp -4 s exp -1 . After steel 34 CrMo 4-D has turned out to be too inhomogeneous for giving significant results, the whole testing series had to be repeated with steel 34 CrMo 4-AT which has proved to be homogeneous. Both, with hydrogen and with nitrogen the new steel gave good results showing a very slight increase in the reduction of area, Z, with increasing strain rate. No minimum in the reduction of the area was found, even after further lowering the strain rate to 4.17 x 10 exp -7 .s exp -1 . (ERA citation 08:051208)