Royal Ironworks of St John, Ipanema
Royal Ironworks of St John, Ipanema — simplified overview
The Royal Ironworks of St John, Ipanema, also known as Real Fábrica de Ferro São João do Ipanema or Fundição Ipanema, was Brazil’s first ironworks to operate continuously. It sits in the Sorocaba region near Iperó, São Paulo, and today only ruins of its twin blast furnaces remain, near Fazenda Ipanema.
When it started and what happened next
- The factory was established by royal charter on December 4, 1810. It began under the Portuguese Crown and later passed to the Brazilian Imperial government after Brazil’s independence.
- It operated from 1810 to 1821 under the crown, then from 1822 to 1889 under Brazil’s imperial government. It closed in 1895, reopened in 1917 during World War I, and finally closed in 1926.
- The site is considered the birthplace of Brazil’s steel industry.
Why the location was chosen
- The builders needed wood to fuel the furnaces and water to power air-blowing equipment. It was also important to be near magnetite ore deposits.
- The ironworks was placed on the Ipanema Hill and connected to a dam on the Ipanema River, making it suitable for large-scale iron production.
People and plans behind the factory
- The project came from the Portuguese Crown and involved Swedish and German experts. A Swedish team led by Carl Gustav Hedberg originally built four smaller furnaces for the direct method.
- In 1815, Hedberg was replaced by the German Friedrich Ludwig Wilhelm Varnhagen, who was put in charge of building the larger blast furnaces. Hedberg’s foreman, Lars Hultgren, helped with construction and operation.
- The arrival of the royal family in Brazil in 1808 and the leadership of Varnhagen helped make the operation productive and profitable in its early years.
What the factory produced
- The ironworks produced thousands of tons of cast iron. Outputs included iron plates and pans for kitchens, ammunition, iron rolls for sugar mills, rails, bars, ladders, lanterns, and more. Some products even won prizes at fairs.
Later developments and decline
- In the mid-19th century, the mine was connected to the factory by a 4-kilometer railroad. The furnaces were expanded, a new refining unit using Austrian technology was added, and a rolling mill was installed. There were plans for a larger blast furnace and a Bessemer reactor, but operations were halted in 1895 due to insufficient income.
- The Ironworks is remembered as the birthplace of Brazil’s steel industry. Today, less than 20% of the original complex remains, with the twin furnaces preserved under the National Forest of Ipanema in Iperó.
Where to find historical information
- Official documents and records about the factory are kept in national and state repositories, including the National Archives, the National Library of Brazil (Rio de Janeiro), and the State Public São Paulo library.
See also
- Ipanema Hill
- Francisco Adolfo de Varnhagen
- Sorocaba
- Iperó
- List of preserved historic blast furnaces
Key facts
- Founded: 1810
- Defunct: 1926
- Location: Sorocaba region near Iperó, São Paulo, Brazil
- Owners: Portuguese Crown (1810–1821), Brazilian Imperial government (1822–1889), Brazilian Army (1865–1889), Private shareholders
- Products: Iron, pig iron, ammunition, iron plates, pans, rails, bars, ladders, lanterns, and more
The Royal Ironworks of St John, Ipanema marked the start of Brazil’s iron and steel industry and remains a symbol of Brazil’s early industrial era.
This page was last edited on 1 February 2026, at 21:42 (CET).