Industry-Verified Manufacturing Data (2026)

Hearth Bottom

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Hearth Bottom used in the Basic Metal Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Hearth Bottom is characterized by the integration of Refractory Lining and Steel Shell/Plate. In industrial production environments, manufacturers listed on CNFX commonly emphasize Refractory Brick construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The bottom structural component of a hearth that supports materials during heating processes.

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Product Specifications

Technical details and manufacturing context for Hearth Bottom

Definition
The hearth bottom is the foundational structural element of a hearth, typically forming the base upon which materials are placed for heating, melting, or processing. It is designed to withstand high temperatures, thermal cycling, and mechanical loads from the materials above, while often providing containment and facilitating heat transfer or drainage.
Working Principle
The hearth bottom functions by providing a stable, heat-resistant platform. It supports the charge (material being processed), contains it within the hearth structure, and often plays a role in heat distribution or the removal of molten materials (slag or metal) through designed slopes, drains, or tapholes. Its construction must manage thermal expansion and resist chemical attack from the process materials.
Common Materials
Refractory Brick, Castable Refractory, High-Temperature Steel
Technical Parameters
  • Thickness of the hearth bottom lining, critical for thermal insulation and structural integrity. (mm) Per Request
Components / BOM
  • Refractory Lining
    Provides thermal insulation and resistance to high temperatures and chemical corrosion from the process.
    Material: Refractory Ceramic
  • Steel Shell/Plate
    Provides structural support and containment for the refractory lining and the overall hearth load.
    Material: Carbon Steel or Alloy Steel
  • Cooling System (if applicable)
    Manages heat extraction to protect the steel structure from excessive temperatures, often using water or air channels.
    Material: Copper, Steel
Engineering Reasoning
0-1200°C, 0-5 MPa compressive load
Thermal stress exceeding 250 MPa at 1300°C, compressive yield strength drop below 150 MPa at 1250°C
Design Rationale: Thermal fatigue from cyclic heating/cooling (coefficient of thermal expansion mismatch: 12×10⁻⁶/°C for refractory vs 23×10⁻⁶/°C for steel support), creep deformation above 0.4×melting temperature (Tm≈1800°C)
Risk Mitigation (FMEA)
Trigger Thermal gradient exceeding 800°C across 100 mm thickness
Mode: Cracking propagation through refractory lining (crack growth rate >0.1 mm/cycle)
Strategy: Graded refractory design with intermediate expansion layers (ZrO₂ buffer at 8×10⁻⁶/°C)
Trigger Localized overheating to 1400°C for >2 hours
Mode: Refractory spalling due to phase transformation (β→α cristobalite at 270°C with 3.4% volume change)
Strategy: Embedded thermocouple array with PID-controlled cooling jets (response time <5 seconds)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hearth Bottom.

hearth bottom refractory lining basic metal manufacturing hearth bottom high-temperature steel hearth bottom hearth bottom cooling system design castable refractory hearth bottom

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hearth
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Static load capacity up to 500 kPa (72.5 psi), dynamic load capacity up to 200 kPa (29 psi)
other spec: Thermal shock resistance: ΔT ≤ 300°C/min, corrosion resistance to basic slags up to pH 12
temperature: Up to 1600°C (2912°F) continuous, 1800°C (3272°F) peak
Media Compatibility
✓ Molten metals (e.g., steel, copper alloys) ✓ Ceramic batch materials (e.g., alumina, silica) ✓ High-temperature refractory aggregates
Unsuitable: Highly acidic environments (pH < 4) with halogen compounds
Sizing Data Required
  • Maximum operating temperature profile (°C/°F)
  • Total static and dynamic load (kg/m² or lb/ft²)
  • Hearth area dimensions and support structure configuration (m² or ft²)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Cyclic heating and cooling from furnace operations causes expansion/contraction stresses, leading to crack initiation and propagation in refractory materials or metal components.
Refractory erosion/spalling
Cause: Chemical attack from slag/metal contact, thermal shock, or mechanical abrasion from material flow degrades refractory lining, reducing structural integrity.
Maintenance Indicators
  • Visible cracks, gaps, or bulging in refractory lining during inspection
  • Abnormal temperature readings or hot spots on external surfaces indicating refractory failure
Engineering Tips
  • Implement regular thermal imaging surveys to detect early-stage refractory degradation and schedule repairs during planned outages
  • Use graded refractory materials with proper expansion joints and install sacrificial wear layers in high-erosion zones to protect structural components

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality management systems ASTM E136 - Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C CE Marking - EU conformity for construction products
Manufacturing Precision
  • Flatness: +/- 0.5mm per meter
  • Thermal expansion tolerance: +/- 2% of specified coefficient
Quality Inspection
  • Dimensional verification with coordinate measuring machine (CMM)
  • Thermal cycling test to verify heat resistance and structural integrity

Factories Producing Hearth Bottom

Verified manufacturers with capability to produce this product in China

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✓ 95% Supplier Capability Match Found

P Procurement Specialist from Brazil Jan 31, 2026
★★★★★
"Standard OEM quality for Basic Metal Manufacturing applications. The Hearth Bottom arrived with full certification."
Technical Specifications Verified
T Technical Director from Canada Jan 28, 2026
★★★★★
"Great transparency on the Hearth Bottom components. Essential for our Basic Metal Manufacturing supply chain."
Technical Specifications Verified
P Project Engineer from United States Jan 25, 2026
★★★★★
"The Hearth Bottom we sourced perfectly fits our Basic Metal Manufacturing production line requirements."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

7 sourcing managers are analyzing this specification now. Last inquiry for Hearth Bottom from Thailand (23m ago).

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Frequently Asked Questions

What materials are used in hearth bottom construction?

Hearth bottoms are constructed using refractory brick, castable refractory materials, and high-temperature steel components to withstand extreme thermal conditions in metal manufacturing processes.

How does a hearth bottom support materials during heating?

The hearth bottom serves as the structural foundation that holds and supports raw materials or molten metal during heating processes, providing thermal insulation and mechanical stability while withstanding temperatures up to 1600°C.

What maintenance is required for hearth bottoms?

Regular inspection of refractory lining wear, monitoring of cooling system efficiency (if applicable), and periodic replacement of damaged refractory components are essential for maintaining hearth bottom performance and preventing operational downtime.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Basic Metal Manufacturing sector.

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