Silica Base: Bulk_density 0.8-1.2 g/cm³, SiO₂_content 95-98%

Q: What is the primary function of silica base in mold powders?

The silica base serves as the main fluxing component that melts to form the lubricating slag layer, controlling viscosity and heat transfer during continuous casting.

Q: How does particle size affect silica base performance?

Controlled particle size distribution ensures consistent melting behavior, proper powder flow characteristics, and uniform slag layer formation in the mold.

Q: What purity level is required for silica base in steel casting?

High purity (SiO₂ ≥ 95%) is essential to minimize contamination and maintain consistent chemical and thermal properties in the mold slag.

Component Specifications

Definition

Silica Base is a fundamental material component in continuous casting mold powders, consisting primarily of silicon dioxide (SiO₂) with controlled particle size distribution and chemical purity. It serves as the main fluxing agent and viscosity modifier in the powder system, forming the glassy slag layer that lubricates the steel strand and controls heat transfer during solidification in the continuous casting process.

Working Principle

The silica base material melts at casting temperatures to form a viscous slag layer between the mold wall and solidifying steel shell. This layer provides lubrication to prevent sticking, controls heat extraction through thermal resistance, absorbs non-metallic inclusions from the steel, and protects the molten steel from oxidation. The viscosity-temperature relationship of the silica-based slag is critical for maintaining proper mold lubrication and heat transfer characteristics.

Materials

High-purity silicon dioxide (SiO₂ ≥ 95%), with controlled levels of alumina (Al₂O₃ < 2%), iron oxide (Fe₂O₃ < 0.5%), and alkaline earth oxides. Particle size distribution: 80% between 45-150 microns. May include minor additives for viscosity adjustment.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bulk Density	0.8-1.2 g/cm³
Melting Point	1700-1750°C
Particle Size	45-150 μm (80% passing)
SiO₂ Content	95-98%
Moisture Content	≤0.5%
Al₂O₃ Content	0.5-2.0%
Fe₂O₃ Content	≤0.5%

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

Standards

ISO 10081-1, DIN 51001, ASTM C146

Parent Products

This component is used in the following industrial products

Continuous Casting Mold Powder

Continuous casting mold powder is a specialized granular flux material applied to the molten steel surface in continuous casting molds.

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Engineering Analysis

Risks & Mitigation

Inconsistent viscosity control
Variable melting behavior
Contamination from impurities
Particle segregation during handling

FMEA Triads

Trigger: Inconsistent SiO₂ content or impurity levels
Failure: Unstable slag viscosity leading to poor lubrication or uneven heat transfer
Mitigation: Implement strict raw material quality control and batch testing

Trigger: Improper particle size distribution
Failure: Uneven melting and powder flow issues in the mold
Mitigation: Regular particle size analysis and adjustment of grinding parameters

Trigger: Moisture absorption during storage
Failure: Powder agglomeration and inconsistent feeding to mold
Mitigation: Proper storage in sealed containers with desiccants

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Chemical composition ±1.5%, Particle size distribution ±10% of specified range

Test Method

XRF for chemical analysis, Laser diffraction for particle size, Hot-stage microscopy for melting behavior

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Silica Base

Manufacturer profiles associated with Silica Base.

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Frequently Asked Questions

What is the primary function of silica base in mold powders?