Superman was able to melt majority part of the I beam in less than a second.
http://www.saginawpipe.com/i-beams_jr._beams.htm
Zod should be holding a I beam 7.8" flanger width I-beam which weights about 106 lbs/ft.
So Superman should have melted 1.8 m of I beam which weights about 283.6 kg of steel which should have 3.05 x 10^27 atoms approximately.
Since Superman's heat vision is almost close to twice the temperature of the boiling point of iron (since steel has 98%of iron) it's safe to say that it should have provided energy More than bond dessociation energy of steel which is 3.96 eV = 6.345 × 10^-19 joules.
http://aip.scitation.org/doi/abs/10.1063/1.4979679?journalCode=jcp
Energy required to melt 283.6 kg of steel = 6.345*3.05*10^8 = 1935000000 joules= 1.935 gigajoules .
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