Metso HP300 Mantle N55308265 | Mn18Cr2 Cone Crusher Liner

Technical Specifications: HP300 Mantle N55308265

The N55308265 Mantle is the primary moving wear part for the Metso HP300 cone crusher. Engineered from modified High Manganese Steel, this liner is designed to handle the most abrasive aggregate materials. Unlike standard castings, our cone crusher liner undergoes a specialized water-toughening treatment to ensure the optimal balance between impact toughness and surface hardness.

Material Grade Selection Guide

Choosing the correct alloy is critical for minimizing cost-per-ton. We offer varied material grades tailored to specific geology.

*Service life estimates are based on typical operating conditions and feed material hardness.

Core Advantages: Metallurgy and Design

Our aftermarket crusher spares are engineered to address the common failure points of standard liners. By optimizing the Carbon-to-Manganese ratio, we achieve superior results:

• Work Hardening Capability: The austenitic structure of our Mn18Cr2 steel rapidly hardens upon impact. While the core remains ductile (tough) to prevent cracking, the surface layer reaches 550+ HB, providing a self-renewing wear-resistant skin.
• Precise Fitment: The internal mating surface is CNC machined to strictly control the contact area with the head ball. This prevents the mantle from spinning, a catastrophic failure mode that can destroy the main shaft.
• THOR Technology: For our premium range, we introduce Titanium and Vanadium micro-alloys. This refines the grain structure, retarding crack propagation under high-stress crushing events.

Performance Comparison

Data collected from iron ore mines utilizing our Mn22Cr2-THOR liners indicates measurable efficiency gains compared to standard OEM-equivalent parts:

• Wear Rate: 15-20% reduction in material loss per hour due to faster work-hardening activation.
• Profile Retention: Maintains the crushing cavity profile longer, ensuring consistent product gradation throughout 80% of the liner’s life.
• Changeout Efficiency: Lifting hooks are redesigned for safer and faster rigging, reducing maintenance downtime by approximately 30 minutes per changeout.

Field Diagnosis: When to Replace Your Mantle

As experienced crusher part suppliers, we recommend monitoring the following wear patterns to determine the optimal replacement time:

1. Throughput Drop: If production capacity drops by >10% while power draw remains high, the liner profile is likely distorted (cupping), reducing crushing efficiency.
2. Liner Thickness: Measure the mantle thickness at the bottom 100mm. If it is less than 20-25mm, replace immediately. A thin mantle can crack, causing the backing compound to disintegrate and the liner to spin.
3. “Haystacking”: If you notice oversized material passing through, the “Closed Side Setting” (CSS) may no longer be maintainable due to uneven wear grooves in the mantle.

Workshops And Warehouses

Cross-Brand Compatible

Our aftermarket spare parts are engineered to be fully interchangeable with OEM components across major brands, ensuring identical fit and function.

Frequently Asked Questions (FAQ)

Q1: What backing compound should I use for the N55308265 Mantle?
We recommend a high-impact epoxy backing compound. Ensure the head is clean and dry. Standard consumption for an HP300 mantle is approximately 25-30kg, but always have extra on hand.

Q2: Can I mix an Mn18 Mantle with an Mn22 Bowl Liner?
Technically yes, but it is not recommended. For uniform wear profiles, we advise matching the metallurgy of the fixed and moving liners. Uneven wear rates can cause cavity distortion and poor product shape.

Q3: Does this mantle come with the torch ring?
Standard shipments include the mantle only. The torch ring (locking nut cover) is a separate wear item but can be included in the “Wear Kit” package upon request.

Expert Tip regarding Installation: When installing the HP300 Mantle, ensure the Locking Nut is tightened according to the specific torque procedure. Crucially, after pouring the backing compound, allow it to cure fully (typically 8-12 hours depending on ambient temperature) before restarting the crusher. Premature startup leads to backing fragmentation and liner loosening.

*All manufacturer names, part numbers and descriptions are used for reference only. They belong to their respective OEMs. NEWREG supplies aftermarket replacement parts – independently manufactured and warranted, not OEM-originated. No affiliation with OEMs is claimed or implied.