INDUSTRY COMPONENT

Metal Sheath

High-temperature protective sheath for molten metal temperature sensor probes in industrial applications.

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Component Specifications

Definition
A metal sheath is a protective tubular component designed to encase and shield the sensitive elements of a molten metal temperature sensor probe from extreme thermal, chemical, and mechanical stresses encountered in high-temperature industrial environments such as foundries, steel mills, and metal casting operations. It ensures sensor longevity and measurement accuracy by providing a durable barrier.
Working Principle
The metal sheath operates on the principle of thermal conduction and protection. It is inserted into molten metal, where it rapidly equilibrates to the metal's temperature. The sheath transfers heat to the internal sensor element (typically a thermocouple or RTD) while shielding it from direct contact with corrosive, abrasive, or electrically conductive molten materials. Its design minimizes thermal lag and maximizes response time.
Materials
High-temperature alloys such as Inconel 600, Incoloy 800H, 310 Stainless Steel, or Molybdenum for ultra-high temperatures. Material selection depends on maximum service temperature (up to 1800°C), corrosion resistance (against molten iron, aluminum, copper, etc.), and thermal conductivity requirements.
Technical Parameters
  • Length 300mm to 1200mm
  • Outer Diameter 6mm to 25mm
  • Wall Thickness 1.5mm to 4mm
  • Connection Type Threaded (e.g., NPT, BSP), Flanged, or Weld-in
  • Immersion Depth Standard 300mm, custom available
  • Max Temperature 1200°C to 1800°C
  • Pressure Rating Atmospheric to 5 bar
Standards
ISO 13732-1, DIN 43735, ASTM E230

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metal Sheath.

metal sheath molten metal temperature sensor thermocouple protection high-temperature sheath Inconel sheath foundry sensor steel mill probe industrial temperature measurement Metal Sheath in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Molten Metal Temperature Sensor Probe

High-temperature immersion probe for continuous molten metal temperature monitoring

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Engineering Analysis

Risks & Mitigation
  • Thermal fatigue cracking
  • Chemical corrosion from slag/flux
  • Mechanical damage during insertion/removal
  • Inaccurate readings due to sheath contamination
FMEA Triads
Trigger: Repeated thermal cycling
Failure: Crack formation in sheath wall
Mitigation: Use alloys with high thermal fatigue resistance; implement controlled heating/cooling cycles.
Trigger: Chemical attack from molten metal impurities
Failure: Corrosion and wall thinning
Mitigation: Select corrosion-resistant materials; apply protective coatings if compatible.
Trigger: Improper handling or insertion
Failure: Bending or puncture of sheath
Mitigation: Train operators; use guided insertion tools; design with robust wall thickness.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5% of reading for temperature accuracy, dimensional tolerances per ISO 2768-m
Test Method
Calibration per ASTM E220, pressure testing per ISO 15848, material certification per EN 10204 3.1

Buyer Feedback

★★★★☆ 4.9 / 5.0 (17 reviews)

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"The technical documentation for this Metal Sheath is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Metal Sheath so far."

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Frequently Asked Questions

What is the primary function of a metal sheath in a molten metal temperature sensor?

To protect the internal sensor element from direct exposure to molten metal, preventing corrosion, abrasion, and electrical interference while ensuring accurate temperature measurement.

How do I select the right material for a metal sheath?

Choose based on the molten metal type (e.g., iron, aluminum), temperature range, chemical compatibility, and required service life. Common materials include Inconel for general use and Molybdenum for extreme temperatures.

Can metal sheaths be reused after exposure to molten metal?

Yes, if undamaged and cleaned properly, but lifespan depends on material degradation from thermal cycling and corrosion. Regular inspection is recommended.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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