Molten Steel

Molten Steel is the high-temperature liquid form of Steel produced when Steel reaches extreme temperatures. Steel melts into Molten Steel at 2429.85°C (reported as melting point +3°C) but Molten Steel does not solidify until it cools to 1080.85°C (reported as freezing point -3°C). This large temperature hysteresis makes Molten Steel an excellent working fluid for very high-temperature processes and heat transfer chains; it can be reheated in a Metal Refinery and used in industrial loops that operate far above the temperatures practical for most other liquids. In the DLC environment, Molten Steel is comparable to other extreme-temperature liquids such as Liquid Uranium for specialized applications.

Molten Steel has several practical uses and interactions that make it a powerful tool in late-game engineering and thermal management:

• Molten Steel can be used to melt Regolith into Magma, generating very large amounts of excess heat useful for power generation or for driving other high-temperature reactions.
• Molten Steel melts natural Metal Tile deposits, which lets you recover metal without suffering the usual 50% mass loss from excavation of those tiles.
• Molten Steel converts Sand into Glass. This process is about four times as efficient as a Glass Forge (and effectively eight times more mass-efficient when accounting for the mass lost by digging), while also requiring less labor and electrical power than repeated Glass Forge usage.
• In vacuum setups, a Steel Thermo Aquatuner used to cool water will dump enough heat as it overheats to melt the Thermo Aquatuner itself; a single run can produce around 1,200 kg of Molten Steel from that destruction. This behavior can be exploited to generate Molten Steel intentionally, but it involves destroying equipment.
• A Steel Liquid Pump provides useful mechanical interactions: it can utilize the pump’s extended draw range, be used to repair or replace overheat-damaged pumps, or be repeatedly deconstructed and rebuilt to force liquids into piping systems when direct pumping is otherwise difficult.

Operational notes and cautions:

• Because Molten Steel remains liquid down to a very high temperature, it requires insulation and materials that tolerate extreme heat in order to contain and transport it safely. Use high-temperature tiles and piping where possible.
• Reheating and refining Molten Steel is done in a Metal Refinery; plan for significant energy inputs and suitable heat dissipation.
• Many of the most efficient workflows involving Molten Steel rely on destructive or single-use methods (for example intentionally overheating equipment). Factor replacement costs and material availability into designs that use those methods.
• When using Molten Steel for glass-making or melting tiles, account for how resource mass and energy flows change compared with conventional production chains (e.g., the stated efficiency multipliers versus the Glass Forge and excavation mass penalties).

Molten Steel is therefore a specialized but potent resource for endgame engineering, high-temperature heat management, and resource conversion when the infrastructure exists to handle its extreme temperatures.