Do you make degassing lances and fluxing tubes?

Yes. We machine graphite degassing lances and stirring elements for non-ferrous metals, selecting grades for thermal resistance and shock.

Why are degassing lances made of graphite?

Because they must stay submerged in molten metal without dissolving or being wetted, while housing a machined internal bore. Graphite handles that combination and allows relatively low-cost replacement as the part is consumed.

What causes the bore to clog?

Metal or flux entering when gas flow is interrupted, and oxides being drawn toward the tip. Maintaining gas pressure during immersion and withdrawal is the usual way to prevent it.

Are rotors and diffuser tips made to size?

Yes. Body, bore, diffuser tip, thread, and equipment adapter are machined to drawing or from the used part.

Does the lance contaminate the bath?

Any contribution depends on grade purity and immersion time. When the treated metal is sensitive, a low-ash grade is specified; that value is published per grade.

Graphite degassing lances and fluxing tubes for molten aluminum

Metallurgical applications

Foundry degassing lances

Graphite lances and fluxing tubes are used in the foundry industry to inject gases into the bottom of molten material.

Request a quote

Molten bath injection element

Also known as: Graphite degassing lances · Graphite fluxing tubes · Degassing rotors · Gas injection lances

[ Technical summary ]

Lances and fluxing tubes introduce gas — or gas with flux — into the molten bath to carry hydrogen and inclusions to the surface. The part sits submerged in molten metal with gas flowing inside it, so it needs stability at temperature, chemical resistance to the bath, and an internal channel that does not clog. Graphite meets those conditions and allows the bore, the diffuser tip, and the equipment connection to be machined.

[ Problem it solves ]

Carry gas to the bottom of the bath and disperse it finely without the lance being rapidly consumed or adding contamination to the treated metal.

Operating conditions

Degassing
Gas injection
Bath treatment

When it is suitable

The bath requires degassing or inert-gas treatment
The lance stays submerged through the treatment
The equipment requires a tip or rotor of defined geometry
Lances must be replaced without depending on the equipment maker

When it may not be suitable

The contacting metal readily dissolves carbon and the alloy cannot tolerate it
The flux used chemically attacks carbon under those conditions
The lance takes bending loads or knocks during immersion

Process challenges

Lance erosion
Blockage
Contamination

Advantages

Thermal stability
Machining of internal channels
Quick replacement

Limitations

Wear from erosion and thermal shock
Possible metal contamination if the grade is unsuitable
Service life depends on cycles and metal flow

[ Critical selection variables ]

These variables define the grade and the geometry. Actual values are confirmed against the grade datasheet.

Molten metal or alloy in contactDecisive
Bath or flux chemistryDecisive
Gas flow and compositionDecisive
Operating temperatureDecisive
Geometry and tolerancesRelevant
Rotational speedRelevant
Required purity and allowable contaminationRelevant

[ Required material properties ]

Properties that guide selection. Numerical values come from each grade's datasheet.

Critical properties

Thermal shock resistance
Non-wetting by molten metal
Chemical resistance
Flexural strength

Secondary properties

Thermal stability
Machinability
Ash content

[ Related ]

[ Frequently asked questions ]

View all FAQs

Technical content reviewed by ESGRAF — Last reviewed: September 8, 2026

[ Quote ]

Need the right specification—not just material?

Tell us your application. Engineering response in under 24 hours.

Request a quote Talk to an advisor