When did Henry Bessemer invent the steam engine?

Henry Bessemer did not invent the steam engine; he is best known for developing the Bessemer process in the 1850s, which revolutionized steel production. The steam engine was developed earlier, with significant contributions from inventors like Thomas Newcomen in the early 18th century and James Watt in the late 18th century. Bessemer's innovations focused on Metallurgy rather than steam engine technology.