Technical guide by ZhenAn International Co., Limited - metallurgical raw material supplier · Updated 2026-08-10
Cored wire feeding is a controlled method of introducing alloying or treatment materials into molten steel. The wire is fed through a wire feeder and guide system into the ladle, where the steel sheath melts and releases the core material below the slag layer. Compared with adding bulk alloy from the top of the ladle, this allows the addition to take place deeper in the molten steel and gives the operator better control over the amount of material introduced.
A typical feeding system controls two basic values: how much wire is fed and how fast it enters the ladle. Modern systems may use an HMI or other control system to display and control feeding length and speed.
The actual feeding condition is not determined by speed alone. Wire diameter, molten steel temperature, ladle conditions and the required alloy addition all affect how the operation should be set up. These variables need to be considered together when establishing a stable cored wire feeding operation.
How Does Cored Wire Feeding Work?
The feeding process begins with a coil of cored wire for steelmaking connected to a wire feeder. Drive wheels pull the wire from the coil and push it through guide tubes toward the ladle. The operator or control system determines the feeding speed and the required wire length before the treatment begins.
After the wire enters the molten steel, the outer steel sheath heats and melts, allowing the material inside the wire to be released into the bath.
One of the main advantages of this method is that the alloy is introduced below the slag layer rather than being placed directly on top of it. This allows a more controlled alloy addition and is one reason cored wire feeding is used when steel chemistry needs to be adjusted more precisely.
Different cored wires can carry different alloying or treatment materials, but the basic operating principle remains the same: the feeder controls the wire entering the ladle, while the wire specification and process conditions determine how much material is introduced and where it is released.
Cored Wire Feeding Speed and Feed Length
Feeding speed is one of the most important parameters in a cored wire feeding operation.
Commercial wire feeders use variable-speed control because different wire diameters and process requirements do not use exactly the same feeding conditions. The suitable setting has to match the wire specification, molten steel condition and treatment requirement.
The role of feeding speed is closely connected with what happens after the wire enters the molten steel. The wire needs to penetrate far enough into the bath before the sheath is completely consumed and the core material is released.
If operating conditions change, the same feeding speed may no longer produce the same result. A change in wire diameter, treatment temperature or ladle condition can alter the way the wire behaves after entering the bath.
For this reason, feeding speed should be treated as a process parameter rather than a fixed value that can be applied to every cored wire.
Feed length is equally important because it determines the total amount of alloy introduced. When the amount of core material per metre is known, the required alloy addition can be converted into the corresponding wire length.
This also means that two wires with the same diameter do not necessarily require the same feeding length if their core weight or alloy content per metre is different.
How Molten Steel Temperature Affects Feeding Conditions
Molten steel temperature is another important factor in cored wire feeding.
The outer steel sheath begins heating as soon as the wire enters the bath. A change in steel temperature changes the thermal conditions around the wire and can therefore affect how quickly the sheath heats and releases the core material.
This is why feeding speed and treatment temperature should not be considered separately.
A feeding setting that performs consistently under one temperature condition should not automatically be expected to behave in exactly the same way when the molten steel temperature changes significantly.
If treatment conditions change, both the steel temperature and feeding parameters should be reviewed together rather than adjusting the wire dosage alone.
Wire Diameter and Cored Wire Specification
Wire diameter affects both equipment compatibility and the amount of material that can be delivered during feeding.
Different wire feeders are designed for particular diameter ranges, so the selected cored wire must first be compatible with the existing feeding equipment.
Diameter also affects the amount of core material that can be contained in each metre of wire. A larger wire may carry more alloy per metre, which changes the total feeding length required for the same treatment target.
For this reason, the useful specification is not simply the nominal wire diameter. We also need to know the core material, alloy content and core weight per metre.
When changing from one cored wire specification to another, the previous feeding length and operating settings should therefore be reviewed instead of being copied automatically.
Feeding Depth and Ladle Conditions
One of the main reasons for using cored wire is that the alloying or treatment material can be introduced below the slag layer instead of being added directly at the surface.
The relationship between feeding speed, wire behavior and ladle depth therefore matters to the operation.
The wire needs to remain intact long enough to carry the core material into the intended part of the molten steel before complete release takes place. The actual behavior depends on the feeding condition, treatment temperature, wire construction and the depth of the molten steel.
This is why feeding depth should not be treated as an isolated parameter.
It is closely connected with feeding speed and temperature. A change in one of these conditions can change where the wire releases its core even when the cored wire itself has not changed.
The ladle and feeding system should also provide a stable path for the wire to enter the molten steel. Consistent wire entry helps make the feeding operation more repeatable from one heat to another.
How the Wire Feeder Controls the Operation
The wire feeder turns the required alloy addition into a controlled mechanical operation.
A typical system uses drive wheels to move the wire through guide tubes and into the ladle. Depending on the equipment, feeding speed and feeding length can be controlled through an HMI, PLC or other control system.
The main purpose of this control is repeatability.
If the same wire specification and treatment target are used across multiple heats, the feeder should deliver the required wire length under consistent feeding conditions.
Automated systems may also record feeding speed, wire length and other treatment data. This makes it easier to compare actual operating conditions between heats and identify whether changes in treatment results are associated with the wire or with the feeding process.
The feeder is therefore not simply a device for pushing wire into the ladle. Its accuracy directly affects how consistently the planned alloy addition can be carried out.
Alloy Addition and Recovery
The purpose of cored wire feeding is not simply to consume a certain number of metres of wire. The process needs to introduce the required amount of alloy or treatment material into the molten steel with acceptable consistency.
This is why alloy recovery or treatment yield is an important part of evaluating a cored wire feeding operation.
To understand the result, several values need to be considered together: the cored wire specification, the amount of alloy contained per metre, the total feeding length, the process conditions and the final steel chemistry.
In simple terms, the relationship can be viewed as:
Wire Specification → Alloy per Metre → Feeding Length → Process Conditions → Final Chemistry
If the same wire length produces noticeably different final results from one heat to another, the difference may not necessarily come from the nominal chemistry of the cored wire. Treatment temperature, feeding conditions and other process variables can also influence the effective alloy addition.
For this reason, recovery is more meaningful when several comparable heats are evaluated together rather than judging the cored wire from a single treatment result.
What Information Is Needed to Set a Cored Wire Feeding Operation?
There is no single set of feeding parameters that can be applied to every cored wire and every steelmaking process.
The operating condition needs to match the wire itself and the actual treatment environment.
When we discuss a cored wire application with a steel producer, the first information we need is usually the wire type and diameter, because these determine what material is being introduced and how much alloy can be supplied per metre.
The ladle weight and molten steel temperature provide the process context, while the existing feeding speed and total wire length show how the material is currently being added.
The required alloy addition or final chemistry target is also important because it determines how much core material the treatment needs to deliver.
With these values, a new wire specification can be compared with the existing feeding practice more accurately than by looking at wire diameter or feeding speed alone.
Cored Wire for Steelmaking
A stable cored wire feeding operation starts with a wire specification that matches your metallurgical requirement and existing feeding equipment.
Send us your wire type, diameter, steel grade, ladle weight and current feeding parameters. We can help confirm a suitable cored wire specification for your process.
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