Continuous Casting Mold Flux

Product Specifications

Technical details and manufacturing context for Continuous Casting Mold Flux

Definition

Continuous casting mold flux is a specialized powdered material applied to the surface of molten steel in continuous casting molds. It melts to form a protective slag layer that prevents oxidation, absorbs inclusions, and provides thermal insulation. The molten flux lubricates the mold-strand interface, reducing friction and preventing sticking. It also regulates heat transfer to control solidification and improve surface quality of the cast steel strand. The flux is composed of materials such as silica (SiO2), calcium oxide (CaO), alumina (Al2O3), fluorite (CaF2), and carbon. Key parameters include a basicity index (CaO/SiO2 ratio) of 0.9–1.3, melting temperature of 1050–1200°C, viscosity at 1300°C of 0.1–0.5 Pa·s, carbon content of 2–8%, particle size distribution with 90% min passing 0.5 mm, free fluorine content ≤0.5%, moisture content ≤0.5%, bulk density of 0.6–0.9 g/cm³, melting rate of 30–60 seconds at 1300°C, break temperature of 1100–1250°C, thermal conductivity of 0.1–0.3 W/(m·K), and packaging options of 25–1000 kg bags or drums. These values are typical reference ranges and must be confirmed for the specific application. The flux is used in the iron and steel basic production industry. It is a material product type, not a device. For procurement, verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The powder is spread on the molten steel surface in the continuous casting mold. Upon contact with the hot steel, it melts to form a liquid slag layer. This layer serves multiple functions: it protects the steel from oxidation by atmospheric oxygen, absorbs non-metallic inclusions rising from the steel, and provides thermal insulation to reduce heat loss. The molten slag also flows into the gap between the mold and the solidifying strand, acting as a lubricant to reduce friction and prevent sticking. Additionally, the slag layer controls the rate of heat transfer from the strand to the mold, which is critical for uniform solidification and surface quality. The composition and properties of the flux, such as basicity, viscosity, and melting temperature, are tailored to achieve the desired performance.

Common Materials

Silica (SiO2), Calcium oxide (CaO), Alumina (Al2O3), Fluorite (CaF2), Carbon

Technical Parameters

Parameter	Typical range	Notes & selection driver
Basicity IndexRequired	0.9–1.3 ratio	CaO/SiO2 ratio affecting melting behavior and slag properties
Melting TemperatureRequired	1050–1200 °C	Temperature range at which flux becomes fully liquid
Viscosity at 1300°CRequired	0.1–0.5 Pa·s	Fluidity of molten flux at typical casting temperatures
Carbon ContentRequired	2–8 %	Percentage of carbon controlling melting rate and insulation
Particle Size DistributionRequired	≤0.5mm 90% min mesh	Granularity affecting flowability and melting characteristics
Free Fluorine Content	≤0.5 %	Fluorine percentage influencing viscosity and heat transfer
Moisture Content	≤0.5 %	High moisture causes spattering
Bulk Density	0.6–0.9 g/cm³	Affects feeding and melting behavior
Melting Rate	30–60 s	Time for complete melting at 1300°C
Break Temperature	1100–1250 °C	Temperature where viscosity changes sharply
Thermal Conductivity	0.1–0.3 W/(m·K)	Influences heat transfer from strand
Packaging	25–1000 kg	Bag or drum options

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Glass Formers Part
Create amorphous slag structure for lubrication

Material: SiO2, Al2O3
Fluxing Agents Part
Lower melting temperature and adjust viscosity

Material: CaO, CaF2, Na2O
Carbon Additives Part
Control melting rate and provide insulation

Material: Coke, graphite, carbon black
Inclusion Absorbers Optional
Capture non-metallic inclusions from steel

Material: CaO, MgO

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Continuous Casting Mold Flux.

Manufacturers of Continuous Casting Mold Flux

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.

Wanhao Refractory

Beijing, CN

Also makes: Electric Arc Furnace, Reheating Furnace, Electromagnetic Induction Heater and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the function of continuous casting mold flux?

It melts to form a protective slag layer that prevents oxidation, absorbs inclusions, provides thermal insulation, lubricates the mold-strand interface, and regulates heat transfer to improve surface quality.

What are the typical materials used in mold flux?

Typical materials include silica (SiO2), calcium oxide (CaO), alumina (Al2O3), fluorite (CaF2), and carbon.

How is the basicity index of mold flux defined?

Basicity index is the ratio of CaO to SiO2, typically ranging from 0.9 to 1.3, affecting melting behavior and slag properties.

Why is it important to verify specifications with the manufacturer?

The listed values are reference ranges; actual performance depends on the specific steel grade and casting conditions, so confirm with the supplier for your application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 0.5 bar (mold pressure)
flow rate:	0.5-2.0 kg/ton steel (typical consumption)
temperature:	1300-1600°C (melt pool), 800-1200°C (solidified layer)
slurry concentration:	Not applicable (powder form, melts in-situ)

Product Specifications

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