Bimetallic Liner Tube: Inner Diameter 25-300 mm

Component Specifications

Definition

A specialized cylindrical component installed inside polymer extrusion barrels, constructed from two metallurgically bonded layers: an inner wear-resistant alloy (typically cobalt/nickel-based) and an outer structural steel layer. This dual-material design optimizes performance by combining abrasion resistance with structural integrity and efficient heat transfer.

Working Principle

Operates by creating a durable, low-friction inner surface that withstands continuous polymer flow while maintaining precise temperature control through the conductive outer layer. The metallurgical bond ensures thermal expansion compatibility and prevents delamination under operational stresses.

Materials

Inner layer: Cobalt-based alloy (Stellite 6/12) or Nickel-based alloy (Colmonoy); Outer layer: Carbon steel (AISI 4140/4340) or Alloy steel; Bonding method: Centrifugal casting or powder metallurgy fusion.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	500-4000 mm
Inner Diameter	25-300 mm
Wall Thickness	5-40 mm
Pressure Rating	Up to 100 MPa
Surface Roughness	Ra 0.2-0.8 μm
Operating Temperature	Up to 400°C
Hardness (Inner Layer)	HRC 55-65

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 9001, DIN 8580, ASTM A532

Parent Products

This component is used in the following industrial products

Polymer Extrusion Barrel Liner

A precision-machined cylindrical liner that fits inside extrusion barrels to protect against polymer abrasion and corrosion.

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Engineering Analysis

Risks & Mitigation

Thermal fatigue cracking
Delamination of layers
Abrasive wear from filled polymers
Corrosion from processing additives
Improper installation causing stress concentrations

FMEA Triads

Trigger: Excessive thermal cycling
Failure: Thermal fatigue cracks in inner layer
Mitigation: Implement controlled heating/cooling cycles; use temperature monitoring systems

Trigger: High abrasive polymer compounds
Failure: Premature wear of inner surface
Mitigation: Select appropriate alloy grade; implement polymer filtration; optimize processing parameters

Trigger: Improper installation
Failure: Delamination or poor thermal transfer
Mitigation: Follow manufacturer installation procedures; use proper tooling; verify interference fit

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ID tolerance: ±0.05 mm; OD tolerance: ±0.1 mm; Straightness: 0.1 mm/m

Test Method

Ultrasonic testing for bond integrity, hardness testing (Rockwell C), dimensional verification, pressure testing

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Bimetallic Liner Tube

Manufacturer profiles associated with Bimetallic Liner Tube.

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Frequently Asked Questions

What are the main advantages of bimetallic liners over single-material liners?

Bimetallic liners combine the wear resistance of hard alloys with the structural strength and thermal conductivity of steel, offering longer service life, better temperature control, and reduced maintenance compared to single-material alternatives.

How are bimetallic liner tubes installed in extrusion barrels?

They are typically shrink-fitted or hydraulically pressed into the barrel housing, creating an interference fit that ensures thermal contact and prevents rotation during operation.

What maintenance is required for bimetallic liner tubes?

Regular inspection for wear patterns, cleaning to prevent polymer degradation buildup, and monitoring of temperature profiles. Replacement is needed when wear exceeds manufacturer specifications.

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.

Bimetallic Liner Tube