Hydrogen ppm tested by Leco
To confirm the quantity of hydrogen entrapment in interstitial lattice sites, as-received material was tested in a LECO
(Model No. DH603). Six samples were drawn from the as-received long sample (25 mm) and the amount of hydrogen (in
ppm) was measured and the results were averaged. The furnace temperature of LECO machine was 1000 8C and the liquid
nitrogen flow rate was 3 l/min. The average result measured was 1.5 ppm this is considered to be a detrimental level and will
leave the steel prone to hydrogen embrittlement.