The process of hydrogen cracking is the result of one or more of the micro-mechanisms such as: (a) cleavage, (b)
intergranular decohesion and (c) microvoids coalescence. Microstructure of eutectoid patented steel is primarily pearlitic
with a very few ferrite grains. Steels are having the same microstructure, when it is tested in hydrogen atmosphere, leads to
surface cracking. In parallel, microvoids are generated in the centre of the specimen followed by residual ductile shear
fracture of the remaining cross section. Fracture in air is characterized by very fine dimples, whereas, fracture in presence of
hydrogen appear much rougher fracture surface [2]. Here we will discuss a particular case of failure of cold drawn wire due to
the hydrogen embrittlement.