RNTS	Relative Notch Tensile Strength
REL	Relative Elongation
SEM	Scanning Electron Microscopy
HE index	Hydrogen Embrittlement index
IG	Intergranular
QC	Quasi-Cleavage
$\sigma$	Stress
$\epsilon$	Strain
$F$	Applied force
$A$	Initial cross-sectional area of the specimen
$∆L$	Measured displacement
$L_0$	Initial gauge length of the specimen
$F_C$	Critical force
${\sigma }_N$	Notch strength
${∆L}_C$	Critical displacement
${\epsilon }_f$	Elongation
$\mathrm{m}, \mathrm{n}$	Fitted parameters
$i_H$	Current density
${\mathrm{Q}}_H$	Charge of diffusible hydrogen
$\mathrm{z}$	Valence number for hydrogen
$F_A$	Faraday constant
$\mathrm{V}$	Effective volume
$C_H$	Total hydrogen concentration
${\mathrm{C}}_0$	Saturation level of hydrogen concentration
${\mathrm{A}}_0$ $, R_0$	Sensitivity coefficient and exponent for hydrogen traps