Window Liner: Load Capacity Up to 15,000 kN

Component Specifications

Definition

A window liner is a critical structural component installed within the window openings of rolling mill stand housings. It serves as an interface between the housing and the roll assembly, providing precise alignment surfaces for roll chocks and bearings while protecting the housing from wear, deformation, and stress concentrations during high-load rolling operations. The component ensures dimensional stability and maintains proper clearances under extreme mechanical and thermal conditions.

Working Principle

The window liner functions by distributing rolling forces evenly across the housing structure, preventing localized stress concentrations that could lead to fatigue failure. It maintains precise geometric tolerances for roll positioning, ensuring consistent product quality. During operation, it absorbs vibration and minimizes friction between moving parts, while its replaceable nature allows for maintenance without compromising the integrity of the main housing structure.

Materials

Typically manufactured from high-strength alloy steels (e.g., 42CrMo4, 34CrNiMo6) or specialized wear-resistant materials. Common specifications include: forged or cast steel with hardness 280-350 HB, surface treatments like nitriding or hard chrome plating for enhanced wear resistance, and dimensional tolerances per ISO 2768-m.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	280-350 HB
Dimensions	Customized to mill housing window size
Load Capacity	Up to 15,000 kN
Surface Finish	Ra 1.6-3.2 μm
Flatness Tolerance	0.05 mm per 1000 mm
Operating Temperature	-20°C to 200°C
Parallelism Tolerance	0.02 mm per 1000 mm

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 286-2, DIN 8606, ISO 2768-m

Parent Products

This component is used in the following industrial products

Rolling Mill Stand Housing

The structural frame that supports and contains the rolls, bearings, and adjustment mechanisms of a rolling mill stand.

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Engineering Analysis

Risks & Mitigation

Wear and dimensional degradation over time
Improper installation causing misalignment
Material fatigue under cyclic loading
Thermal expansion mismatch with housing
Corrosion in humid environments

FMEA Triads

Trigger: Excessive wear from abrasive particles
Failure: Loss of dimensional accuracy leading to roll misalignment
Mitigation: Regular inspection, use of wear-resistant materials, proper sealing to prevent contamination

Trigger: Improper installation or mounting
Failure: Uneven load distribution causing housing damage
Mitigation: Precision installation procedures, torque verification, alignment checks

Trigger: Material fatigue from cyclic loading
Failure: Crack formation and potential catastrophic failure
Mitigation: Proper material selection, stress analysis during design, regular non-destructive testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2, surface finish per ISO 1302

Test Method

Dimensional verification with CMM, hardness testing per ISO 6506, ultrasonic testing for internal defects per ISO 17640, surface inspection per visual standards

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 Window Liner

Manufacturer profiles associated with Window Liner.

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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

What is the primary function of a window liner in rolling mills?

The primary function is to protect the housing window from wear and deformation while providing precise alignment surfaces for roll chocks and bearings, ensuring consistent rolling performance.

How often should window liners be inspected or replaced?

Inspection should occur during scheduled maintenance (typically every 6-12 months), with replacement needed when wear exceeds 0.5mm or when surface damage affects roll alignment.

Can window liners be customized for different rolling mill types?

Yes, they are typically custom-engineered for specific mill designs, considering factors like housing dimensions, rolling forces, material being processed, and operating conditions.

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.

Window Liner