Bore Liner Insert: Length 100-500 mm, Wall Thickness 10-25 mm

Component Specifications

Definition

A cylindrical bore liner insert is a critical wear component installed within heavy-duty molten aluminum pouring nozzles. It creates a smooth, thermally stable flow channel that minimizes turbulence, prevents metal adhesion, and protects the nozzle's structural body from direct contact with high-temperature molten aluminum (typically 660-750°C). The insert ensures consistent flow rates, reduces oxidation, and extends nozzle service life in continuous casting or foundry applications.

Working Principle

The bore liner insert operates by providing a sacrificial, high-temperature-resistant barrier between the molten aluminum stream and the nozzle housing. Its low thermal conductivity and high thermal shock resistance maintain structural integrity during rapid heating cycles. The smooth internal bore reduces fluid friction and minimizes turbulence, promoting laminar flow. During operation, it absorbs thermal stress and chemical erosion, gradually wearing in a controlled manner while protecting the more expensive nozzle assembly.

Materials

High-purity alumina ceramic (Al2O3 ≥99.5%), silicon carbide (SiC), or advanced refractory composites. Typical specifications include: density ≥3.8 g/cm³, porosity ≤5%, thermal shock resistance ΔT ≥400°C, maximum service temperature 1600°C, hardness ≥9 Mohs, and corrosion resistance to molten aluminum.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	100-500 mm
Inner Diameter	20-150 mm (customizable)
Surface Finish	Ra ≤1.6 μm
Wall Thickness	10-25 mm
Compressive Strength	≥2000 MPa
Thermal Conductivity	≤30 W/m·K
Operating Temperature Range	600-1600°C

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 5019, DIN 1089-3, ASTM C71

Parent Products

This component is used in the following industrial products

Heavy-Duty Molten Aluminum Pouring Nozzle

High-temperature refractory nozzle for controlled pouring of molten aluminum in casting operations

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal cracking from rapid temperature changes
Chemical erosion from alloy impurities
Mechanical fracture due to improper installation
Flow restriction from alumina buildup

FMEA Triads

Trigger: Thermal stress exceeding material limits
Failure: Radial cracking and catastrophic fracture
Mitigation: Implement controlled preheating protocols (max 200°C/hour) and use inserts with higher thermal shock resistance grades

Trigger: Chemical reaction with molten aluminum alloys
Failure: Progressive erosion and bore diameter enlargement
Mitigation: Select silicon carbide or zirconia-toughened alumina compositions for aggressive alloys

Trigger: Mechanical impact during maintenance
Failure: Chipping or breakage at flange connections
Mitigation: Use installation tools with proper alignment guides and torque-controlled fastening

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ID tolerance: ±0.2 mm, OD tolerance: ±0.3 mm, concentricity: ≤0.1 mm TIR

Test Method

Dimensional verification per ISO 8015, thermal shock testing per ASTM C1171, chemical analysis per XRF, and pressure testing at 2x operating pressure

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

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Bore Liner Insert

Manufacturer profiles associated with Bore Liner Insert.

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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

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Frequently Asked Questions

How often should bore liner inserts be replaced?

Replacement intervals depend on operating conditions, typically 2-6 months of continuous use. Monitor for increased flow turbulence, visible wear, or dimensional changes beyond 5% of original specifications.

Can bore liner inserts be used with other molten metals?

Specific formulations are optimized for aluminum. Using with copper, zinc, or ferrous metals may require different material compositions due to varying chemical reactivity and temperature ranges.

What causes premature failure of bore liner inserts?

Common causes include thermal cycling beyond design limits, mechanical impact during installation, chemical contamination of molten aluminum, and improper preheating procedures.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Bore Liner Insert