1990s

During this decade, the group's business continued to diversify, with the creation of several service companies, most of them to support the work of other companies within the group.

The purchase of the state company Somisa, one of the main steel factories in Argentina, takes place. The company changed its name from Somisa to Siderar (located in Ramallo "Ramallo (Buenos Aires)"), Province of Buenos Aires) when it was privatized, during the government of Carlos Menem. The Argentine economy ministers intervened in its liquidation, who followed a World Bank roadmap, which included thousands of layoffs of metalworkers.

Furthermore, at this stage, the agreement signed with CEAMSE stands out, which initially established that in remuneration for waste disposal, SYUSA would receive "as total and only remuneration the rates and one third of the recovered lands", according to the first clause of the document. However, during the 90s, shortly after the concession ended, some points were modified: the Argentine Government allowed SYUSA to begin accumulating waste vertically, which generated the polluting “garbage mountains.” At the same time, all of the contractor's costly obligations relating to the provision of road, recreational and sports infrastructure over hundreds of filled hectares were eliminated. The payment method was also changed. In principle, for each hectare filled, the Techint company would keep a third of that land. But CEAMSE changed the rules again to benefit internal trade: now, SYUSA would receive more hectares as compensation, because the mountain-shaped accumulation of garbage allowed a greater amount of waste in the same space. The agreement signed during the government years requested that the Techint company could keep only the filled lands. However, with the change brought about by Menemism, SYUSA managed to appropriate 232 coastal hectares, along the river, which were never affected by the disposal of waste. That is, an immense piece of land covered by a beautiful marginal jungle declared an Ecological Reserve, where there is no waste and the lands have a very high economic value, where today Techint plans to create its own “Puerto Madero”. The sale of the land alone will ensure Techint income of up to 300 thousand dollars per hectare, that is, a total of more than US$ 100 million.

According to the existing documentation in the Cadastre Directorate and in the Legislature of the Autonomous City of Buenos Aires, these lands of the Ecological Reserve are landfills resulting from the accumulation of debris produced by the demolition of buildings during the construction of the urban highways of Buenos Aires, and in the southern area what was the Boca Juniors Sports City project in the sixties. Land that for many years was totally forgotten and abandoned. With river flooding, floods, the arrival of dragged material and animals that found a favorable ecosystem on the site, they transformed this enormous open-air garbage dump into a green lung where today, and thanks to the legislation of the Autonomous City of Buenos Aires, they are a special use area not suitable for any real estate business. The documentation rejects any use that could change the destination and owner, this not being the Techint group.

In the '90s, the growth of oil operations in Latin American countries also stands out: Venezuela, Bolivia, Brazil, Ecuador, Mexico and Peru.

2000s

In April 2008, the group's companies in Venezuelan territory were nationalized, generating a commercial controversy, with a respective request for remuneration from the state to the company.

In 2008, its profits reached 1,750 million pesos in the first three quarters of the year, which constitutes a record in the 18 years after its disposal.

During 2009, it incorporated SPIJ, a steel plant in Indonesia.[2]​.

Since 2013, Techint has promoted the Roberto Rocca Network of Technical Schools", made up of three high school institutions in Argentina, Mexico and Brazil, which offer a system of partial or total scholarships to their students.[10]​[11]​.

In 2016, Techint exceeded 45,000 employees, spread across the group's more than 100 companies.[12]​.

1980s

During this decade the company arrived in China, [7]​ Techint was part of the preparations for the coup of March 24, 1976 but had its greatest commitment to the dictatorship on the night of September 22, 1976, known as “the night of the tubes” where navy task groups carried out repressive operations that ended with 75 missing. They were workers from several of the steel plants. Subsequent investigations proved that the Roccas gave up land to set up a clandestine center, next to one of the main Techint factories, and had their private port to embark detainees and Techint's Catalinas building to hold meetings with the military.

In 1976 the group had 30 companies and in 1983, thanks to its connections with the dictatorship, there were 46. In 1981, the company's former intern Domingo Cavallo nationalized Techint's private debt for 352 million pesos, transferring its liabilities to the Argentine state[8]​.

Projects begin to appear such as the 1,400 km Neuquén-Buenos Aires gas pipeline in Argentina, a drinking water system called the Papallacta Integrated System[9]​ They began to work with industrial plants in the treatment of waste from thermoelectric plants and steel plants.

1990s

During this decade, the group's business continued to diversify, with the creation of several service companies, most of them to support the work of other companies within the group.

The purchase of the state company Somisa, one of the main steel factories in Argentina, takes place. The company changed its name from Somisa to Siderar (located in Ramallo "Ramallo (Buenos Aires)"), Province of Buenos Aires) when it was privatized, during the government of Carlos Menem. The Argentine economy ministers intervened in its liquidation, who followed a World Bank roadmap, which included thousands of layoffs of metalworkers.

Furthermore, at this stage, the agreement signed with CEAMSE stands out, which initially established that in remuneration for waste disposal, SYUSA would receive "as total and only remuneration the rates and one third of the recovered lands", according to the first clause of the document. However, during the 90s, shortly after the concession ended, some points were modified: the Argentine Government allowed SYUSA to begin accumulating waste vertically, which generated the polluting “garbage mountains.” At the same time, all of the contractor's costly obligations relating to the provision of road, recreational and sports infrastructure over hundreds of filled hectares were eliminated. The payment method was also changed. In principle, for each hectare filled, the Techint company would keep a third of that land. But CEAMSE changed the rules again to benefit internal trade: now, SYUSA would receive more hectares as compensation, because the mountain-shaped accumulation of garbage allowed a greater amount of waste in the same space. The agreement signed during the government years requested that the Techint company could keep only the filled lands. However, with the change brought about by Menemism, SYUSA managed to appropriate 232 coastal hectares, along the river, which were never affected by the disposal of waste. That is, an immense piece of land covered by a beautiful marginal jungle declared an Ecological Reserve, where there is no waste and the lands have a very high economic value, where today Techint plans to create its own “Puerto Madero”. The sale of the land alone will ensure Techint income of up to 300 thousand dollars per hectare, that is, a total of more than US$ 100 million.

According to the existing documentation in the Cadastre Directorate and in the Legislature of the Autonomous City of Buenos Aires, these lands of the Ecological Reserve are landfills resulting from the accumulation of debris produced by the demolition of buildings during the construction of the urban highways of Buenos Aires, and in the southern area what was the Boca Juniors Sports City project in the sixties. Land that for many years was totally forgotten and abandoned. With river flooding, floods, the arrival of dragged material and animals that found a favorable ecosystem on the site, they transformed this enormous open-air garbage dump into a green lung where today, and thanks to the legislation of the Autonomous City of Buenos Aires, they are a special use area not suitable for any real estate business. The documentation rejects any use that could change the destination and owner, this not being the Techint group.

In the '90s, the growth of oil operations in Latin American countries also stands out: Venezuela, Bolivia, Brazil, Ecuador, Mexico and Peru.

2000s

In April 2008, the group's companies in Venezuelan territory were nationalized, generating a commercial controversy, with a respective request for remuneration from the state to the company.

In 2008, its profits reached 1,750 million pesos in the first three quarters of the year, which constitutes a record in the 18 years after its disposal.

During 2009, it incorporated SPIJ, a steel plant in Indonesia.[2]​.

Since 2013, Techint has promoted the Roberto Rocca Network of Technical Schools", made up of three high school institutions in Argentina, Mexico and Brazil, which offer a system of partial or total scholarships to their students.[10]​[11]​.

In 2016, Techint exceeded 45,000 employees, spread across the group's more than 100 companies.[12]​.