Determinations of hydrogen in ferrous materials by vacuum extraction at 800 degrees C and by vacuum fusion

Abstract

Determinations of hydrogen in a variety of ferrous materials were made by vacuum extraction at 800 0 C and by vacuum fu sion. The warm extraction method has the advantages of rapid operation and relative freedom of the evolved hydrogen from association with other gases. A high hydrogen content produced by h eating in hydrogen at high temperature, or by electrolysis, is unstable at room temperature, but t he hyd rogen contents of commercial steels, after hot working and storage, were low and stable, and without segregation. Steels with high chromium contents dissolve more hydrogen and retain it more tenaciously than do plain carbon or low-alloy steels.