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Steam Machine
The Steam Machine is a small-form-factor gaming PC made by Valve that runs SteamOS, with a first generation from third-party makers in 2015 and a 2026 second generation.
Steam railcar
A steam railcar, or steam-powered railcar, is a self-propelled passenger coach carrying its own steam engine and boiler, an ancestor of the diesel multiple unit used on branch lines from around 1900.
Steam reforming
Steam reforming, also known as steam methane reforming, is an industrial catalytic process in which methane reacts with high-temperature steam to produce hydrogen and carbon monoxide.
Steam trap
A steam trap is an automatic valve that drains condensate from steam lines and equipment while blocking live steam and venting air, using thermostatic, mechanical, or thermodynamic designs.
Steam turbine
A steam turbine, also called the Parsons turbine, converts thermal energy of pressurized steam into rotational mechanical energy; Charles Parsons built the first modern multi-stage design in 1884.
Steam turbine locomotive
A steam turbine locomotive converts boiler steam into traction through a rotary turbine rather than cylinders, experimented with from 1918 through the 1950s in Sweden, Germany, Britain, and the United States.
Steam-assisted gravity drainage
Steam-assisted gravity drainage (SAGD) is an enhanced oil recovery method that uses two horizontal wells to recover heavy oil and bitumen, widely used in Alberta's oil sands.
Steam-generating heavy water reactor
The steam-generating heavy water reactor (SGHWR) is a nuclear reactor design in which pressure tubes of enriched uranium fuel and boiling light water coolant pass through a heavy water moderator.
Steam–diesel hybrid locomotives
A steam–diesel hybrid locomotive combines a steam plant and an internal-combustion engine in one machine. The best known is the Kitson–Still, tested by the LNER from 1928.
Steamboat
A steamboat is a boat propelled by a steam engine, usually with paddle wheels; it dominated river transport in North America and Britain in the nineteenth century.
SteamOS
SteamOS is a Linux-based operating system developed by Valve that runs the Steam gaming platform on dedicated gaming hardware, most prominently the Steam Deck handheld, released in 2022.
Steamship
A steamship is a ship propelled by a steam engine or turbine rather than sails, displacing sail in commercial shipping almost entirely by the early twentieth century.
Stechkin automatic pistol
The Stechkin automatic pistol (APS, Avtomaticheskiy Pistolet Stechkina) is a Soviet machine pistol designed by Igor Stechkin, adopted in 1951, and issued to tank and artillery crews.
Stede Bonnet
Stede Bonnet, known as the Gentleman Pirate, was a Barbadian planter who turned pirate in 1717, sailed with Blackbeard, and was hanged at Charleston in 1718.
Stedin
Stedin is a Dutch distribution system operator that owns and runs the regional electricity and gas grids for about 5.6 million people in South Holland, Utrecht, and Zeeland.
Steel
Steel is an alloy of iron and carbon, with the boundary to cast iron at about 2.14% carbon. It is the most used metallic material in the world.
Steel Authority of India
Steel Authority of India Limited (SAIL) is an Indian public sector steel company headquartered in New Delhi, set up in 1973 and owned mostly by the government.
Steel casting
Steel casting is a manufacturing process in which molten steel, melted at about 1,600 °C, is poured into a mold and solidified into a near-final shape.
Steel dam
A steel dam is a fixed wall built as a steel deck supported by inclined steel struts. Only three were constructed in the United States between 1897 and 1910.
Steel Dome
Steel Dome (Turkish: Çelik Kubbe) is Türkiye's national integrated air and missile defense architecture, a layered system of systems announced in 2024, with first deliveries of 47 vehicles in August 2025.
Steel Dynamics
Steel Dynamics, Inc. is an American electric arc furnace steelmaker and metals recycler headquartered in Fort Wayne, Indiana. Founded in 1993, it also produces flat rolled aluminum.
Steel frame
A steel frame, also called skeleton frame construction, is a building structure of vertical steel columns and horizontal beams carrying the entire load, so walls need not bear weight.
Steel grades
Steel grades, also known as steel grading, are standardized variants of steel, an iron-carbon alloy with under 2% carbon, with over 3,500 grades each designed for a specific application.
Steel mill
A steel mill, also known as a steel works or steel factory, is an industrial plant that turns iron ore and recycled scrap into finished steel through ironmaking, steelmaking, casting, and rolling.
Steel Pier (Atlantic City)
Steel Pier is an amusement pier on the Boardwalk in Atlantic City, New Jersey, opened in 1898 and once billed as the Showplace of the Nation.
Steel Wool Studios
Steel Wool Studios, also known as Steel Wool Games, is an American video game studio founded in 2012 by five Pixar veterans, best known for Five Nights at Freddy's.
Steelcase
Steelcase is an American office furniture manufacturer founded in Grand Rapids, Michigan in 1912, known for ergonomic seating such as the Leap and Gesture chairs.
Steelmaking
Steelmaking, also known as steel production, is the set of industrial processes converting pig iron, direct reduced iron, and recycled scrap into crude steel via basic oxygen and electric arc furnaces.
Steer-by-wire
Steer-by-wire (SbW) is a vehicle steering technology with no mechanical connection between the steering wheel and road wheels; electronic signals drive actuators that turn the wheels.
Steering
Steering is the system by which a vehicle's driver controls its direction, converting rotation of a wheel into angled motion of the road wheels, often with power assistance.