Development of an Apparatus for Determination of Diffusible Hydrogen in Steel
1984 Volume 70 Issue 2 Pages 277-284
Details
1984 Volume 70 Issue 2 Pages 277-284
A new apparatus for the determination of diffusible hydrogen in steel has been developed by using a gaschromatograph, thermal conductivity detector, and sequencer.
The characteristics of the apparatus are as follows :
1) The lower limit of detection is 10-5ml (N.T.P.), that is 5 × 10-4ppm for 2g specimen.
2) The minimum cycle time of measurement is 3min.
3) Fifteen samples can be measured in parallel when the measurement is carried out every one hour.
4) The measurement shown above is automatically carried out by a programed sequencer.
5) The coefficient of variance of results (approximately 4ml/100g) is about 1%.
The apparatus is useful not only for determination of diffusible hydrogen in weld metal but also for determination of diffusivity of hydrogen in iron, alloy-steel and thin foil of amorphous iron and for measurement of permeability of hydrogen through steel.
It was also revealed that for low hydrogen content specimens the glycerine volumetric method gave much lower results than those obtained by the present method.
