I am a little amused when you say there is "no heavy industry" in argentina.
Certainly, its not the Ruhr or China- but for the size of the country, there actually IS heavy industry. There is a steel industry, Siderar, with a steel mill, and several processing plants downstream capable of making pipe and sheet.
There are shipyards.
There are several automobile factories.
There are tractor and agricultural implement factories.
There are foundries.
There are machine tool manufacturers.
Certainly, Argentina is not completely self sufficient in heavy industry, but it has the infrastructure, and possibility, to build cars, trucks, construction equipment, agricultural equipment, ships, and, without too much of a stretch, it could build trains and airplanes again, as it has on a small scale in the past.
It could increase its steel making capacity, but it does have 2.7 million metric tons a year steel making capacity right now.
It has Aluar, the one of the largest Aluminum smelters in South America.
There are things missing, for sure- but overall, heavy industry in Argentina is better than in dozens of other countries of similar size.