Gas control system for molten metal treatment: metering nitrogen or argon to degassing rotors and ladle porous plugs
Gas flow control for molten metal treatment · Nitrogen or argon metering to aluminium degassing rotors and argon to steel ladle porous plugs, flow and timing settings, minimum flows, mixing time and leakage between panel and plug
This page covers the gas control systems that feed inert gas into molten metal: panels with regulators, flow controllers and valves that meter nitrogen or argon to the rotor of an aluminium degassing unit or to the porous plug of a steel ladle, and change flow with each process step. Ask three things first: the flow range and steps the process needs, how flow is measured and whether the reading reflects the gas actually reaching the melt, and which gases the panel must handle.
Gas flow control systems that meter nitrogen or argon to aluminium degassing rotors and to steel ladle porous plugs, including regulators, flow controllers, valves, changeover and step control. Rotary degassing and fluxing units for aluminium, with rotors, shafts and lifting, are covered on the Molten metal degassing system page, and vacuum induction degassing furnaces on the Vacuum induction degassing unit page. Porous plugs and rotors themselves, and semiconductor gas cabinets, are outside this page.
CNFX editorial research · Sources checked October 12, 2026 · 3 sources
Rinsing and degassing flow steps for an aluminium rotary degasser
A 2022 study of a foundry degassing unit (FDU) on aluminium alloy melts notes that active gases such as chlorine, freon or fluorine, or their mixtures with nitrogen or argon, have been used for rotary degassing in the past; in its plant the carrier gas was nitrogen. Its refining recipe ran in two steps, which the gas control has to switch between. [1]
Editorial calculation: 17 L/min for the 180 s degassing time is 51 L of nitrogen per treatment, and the rinsing flow of 5–7 L/min is roughly a third of the degassing flow. [1]
Give the supplier the gases (nitrogen, argon, any active-gas mix), supply pressure and purity, the number of rotors or plugs fed, the flow range and steps per recipe, required accuracy and response, signals from the degasser or ladle furnace control, and where the panel will be mounted relative to the heat.
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Argon to ladle porous plugs: adjustable range, minimum flow and leaks near the ladle
A 2025 industrial study of a ladle furnace treating heats of about 103 t states that argon injection is adjustable from 50 to 600 dm³/min, that heats group around 300, 400 and 500 dm³/min, and that about 300 dm³/min is the minimum through the main fitting to open the slag layer where alloying additions are dropped. It reports occasional readings of 600 or even above 700 dm³/min, which it says can be caused by leaks in the argon installation near the ladle where heat affects the connections, so that the actual flow through the fitting is lower than intended; flows that high, if they do reach the steel, can disrupt the slag–metal interface and throw metal and slag over the ladle edge. [2]
A 2025 Scientific Reports study of a slot-type gas-permeable module, based on a ladle furnace averaging 200 dm³/min of argon for the grades tested, with B500B as the main grade, found the best variant at about 150 dm³/min industrial equivalent with a mixing time of 90 s, against 145 s for the standard slot plug, and states that for refining stages the optimal flow is below 150 dm³/min. In industrial use, argon consumption of 0.38 kg per tonne with the existing porous plug fell by about 12% and ladle furnace treatment time by about 10%. [3]
Editorial note: because leaks between panel and plug make the panel reading overstate the gas reaching the steel, ask the supplier how the panel checks for leaks, for example by comparing flow with back-pressure at the plug line, and how alarms are set.
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Send the gases, flow steps and connection to the vessel together
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Gases: [nitrogen; argon; mixes; purity; supply pressure]
Consumers: [rotors; porous plugs; number]
Flows: [range; steps per recipe; accuracy]
Control: [signals from degasser or LF; changeover]
Line: [length to vessel; hoses; heat exposure]
Monitoring: [flow; back-pressure; leak alarms]
1 company lists this product among what they make. Company figures are quoted from each
company's own website; every card states where the relationship came from.
Fitok Group
Manufacturing site to be confirmed for the order
Lists gas control systems including pressure control panels, point-of-use panels, changeover systems and gas stick assemblies.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
What gas flow does an aluminium rotary degasser use?
One foundry study ran nitrogen at 5–7 L/min during the rinsing cycle and 15–17 L/min during the 180 s degassing cycle at 300–350 rpm. [1]
How much argon does a ladle furnace inject through the porous plug?
In a 103 t ladle furnace study, argon was adjustable from 50 to 600 dm³/min, with about 300 dm³/min needed through the main fitting to open the slag for additions. [2]
Why can a ladle argon reading be higher than the real flow?
The 103 t ladle study says readings of 600–700 dm³/min can be caused by leaks in the argon installation near the ladle, so that less gas actually passes through the fitting. [2]
Sources and what still needs a direct check
Sources checked 2026-10-12. Three peer-reviewed studies report gas settings and results from an aluminium foundry and steel ladle furnaces; Fitok lists its own gas panels.
