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7ft
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03
Built for Extreme Primary Crushing
Designed to handle demanding quarry and mining environments with stable performance under heavy impact loads.
Processes Large Feed Materials
Capable of crushing boulders up to 1.5 m in diameter, improving primary reduction efficiency in a single pass.
Premium High-Manganese Steel Casting
Manufactured from high-quality manganese steel for superior toughness, impact resistance, and long service life.
Reinforced Heavy-Section Structure
Critical wear zones feature 50 mm enhanced thickness to maintain structural stability under continuous high-pressure crushing.
Maximum Energy Transfer
Optimized liner design directs more crushing force into the material rather than component deformation.
Dynamic Work-Hardening Technology
Initial surface hardness of approximately HRC 45 gradually hardens during operation and can exceed HRC 60 under abrasive conditions.
Extended Wear Life
Adaptive hardening improves abrasion resistance and reduces liner replacement frequency.
Improves Downstream Efficiency
Produces more consistent secondary feed, reducing the load on secondary and tertiary crushing circuits.
Lower Operating Costs
Supports reduced maintenance downtime, improved energy efficiency, and higher overall plant productivity.
Specification | Detail |
|---|---|
Product Name | Symons 7FT Extra Coarse Mn22 Cone Liners |
Compatible Crusher | Symons 7FT Extra Coarse Cone Crusher |
Material | High Manganese Steel (ZGMn22Cr2 / Mn22) |
Initial Hardness | HRC 45 |
Working Hardness | > HRC 60 (Work-hardening property) |
Maximum Feed Size | Up to 1.5 meters in diameter |
Maximum Thickness | Up to 50mm (in critical stress areas) |
Cavity Profile | Extra Coarse |
Manufacturing Process | Casting |
Surface Treatment | Polishing / Spray-Paint (Customized) |
Certification & Standard | ISO 9001, ASTM, GB |
Clamping Mechanism | Heavy-duty robust clamping |
Applications | Primary crushing, large quarries, hard rock mines, major infrastructure projects |
Engineered to redefine the boundaries of primary hard rock crushing, these liners bring unparalleled mechanical advantages to your processing operation. Every contour is purposefully cast to maximize throughput while minimizing the energy expended per ton of processed aggregate, ensuring your plant operates at peak profitability.
Aggressive Reduction Ratio: The specialized extra-coarse geometry forces a highly efficient single-pass reduction, instantly turning massive boulders into manageable material and alleviating mechanical stress on downstream equipment.
Dynamic Work-Hardening: The surface actually grows tougher the more it is battered. This metallurgical evolution ensures the liners maintain their optimal crushing profile long after standard parts would have degraded.
Heavy-Duty Clamping Security: Equipped with robust, precision-machined clamping mechanisms that lock the liners firmly against the crushing forces, preventing any microscopic shifting that could lead to premature wear or catastrophic failure.
Even Wear Propagation: The cavity profile is meticulously balanced to ensure the flow of abrasive material wears the manganese steel uniformly, preserving the high reduction ratio until the very last day of its service life.
Energy Consumption Reduction: By maximizing the primary breakdown efficiency, the entire plant circuit draws less power, directly improving the operational bottom line and reducing carbon footprint.
Cast from heavy-duty high-manganese steel (ZGMn22Cr2), these liners possess an extraordinary work-hardening trait. Starting at a formidable HRC 45, the relentless impact of primary crushing drives the surface hardness beyond HRC 60. This "tougher-with-use" characteristic makes it exceptionally resilient in extreme hard rock scenarios. For operations facing hyper-abrasive conditions, we also provide advanced Titanium Carbide (TIC) inserts or ceramic composite upgrades, drastically driving down the cost per ton produced.
Precision is non-negotiable in heavy machinery. Manufactured strictly to original blueprint tolerances, these components guarantee a flawless, 100% match with the 7FT Extra Coarse crusher. They integrate seamlessly with the original eccentric and adjustment systems. The inclusion of a heavy-duty clamping mechanism ensures absolute stability under extreme primary crushing impacts, completely eliminating any installation anxiety regarding dimensional inaccuracies for procurement managers.
The extra-coarse cavity profile is a masterclass in flow dynamics, specifically optimized for primary reduction. Capable of processing colossal 1.5-meter boulders in a single, devastating pass, this design achieves the maximum possible reduction ratio. By promoting even wear across the mantle and bowl liner, it sustains its geometry, significantly lowering the mechanical burden and cumulative power draw of secondary and tertiary circuits.
Excellence is verified through rigorous, uncompromising standards. Fully compliant with ISO 9001 and ASTM international benchmarks, our closed-loop production covers everything from precise wooden pattern making and pouring to advanced heat treatment and CNC machining. Before dispatch, every casting undergoes a stringent 5-step verification process, including ultrasonic flaw detection, metallographic analysis, hardness testing, and 3D dimensional scanning, ensuring zero porosity or micro-cracks.
Time is the most critical currency in mining operations. Backed by a massive 10,000-ton annual casting capacity and an extensive inventory of ready-to-pour molds for mainstream standard parts, we guarantee rapid response and dispatch. This robust supply chain infrastructure minimizes critical equipment downtime, ensuring your large-scale infrastructure and quarry projects remain strictly on schedule.
No two quarries are identical. Beyond our premium standard components, we offer deep metallurgical customization. If your site processes rock with exceptionally high silica content, our engineers will fine-tune the alloy matrix (adjusting Carbon, Manganese, Chromium, and Molybdenum ratios). We also provide on-site measurement, reverse engineering, and bespoke cavity design services to resolve chronic issues like frequent blockages or uneven localized wear.
We stand behind our metallurgy with an ironclad Fit Guarantee and Quality Assurance. Our commitment extends far beyond the delivery dock. Should any abnormal fracturing or severe manufacturing defect occur, we provide immediate compensation or free replacements. Furthermore, we offer lifecycle technical consultations and detailed wear analysis, completely mitigating procurement risks and maximizing your operational uptime.
Selecting the right manufacturing partner for your heavy-duty crushing components dictates the rhythm and profitability of your entire operation. We do not just supply parts; we engineer reliability into the very heart of your processing plant. Our dedication to metallurgical perfection and dimensional accuracy ensures that every casting we deliver performs flawlessly under the most brutal conditions.
Unmatched Metallurgical Purity: We utilize premium raw materials and advanced degassing techniques during the smelting process to ensure a clean, inclusion-free manganese steel matrix.
End-to-End Manufacturing Control: From the initial 3D mold design to the final precision machining, every step is executed in-house, guaranteeing strict quality oversight.
Global Logistics Expertise: As a seasoned international supplier, we navigate complex shipping and customs requirements to deliver heavy-tonnage parts securely to remote mine sites worldwide.
Continuous Innovation: Our R&D team constantly analyzes field wear data to refine our alloy recipes and cavity profiles, keeping you at the forefront of crushing efficiency.
Dedicated Technical Support: Our engineers are always on standby to assist with installation guidance, operational troubleshooting, and wear life optimization strategies.
Q1: How does the Mn22Cr2 alloy compare to standard Mn18 for primary crushing?
A1: The Mn22Cr2 (ZGMn22Cr2) alloy contains a higher percentage of manganese and chromium, which significantly enhances its work-hardening capacity. While Mn18 is suitable for standard applications, the Mn22 variant is engineered specifically for extreme, high-impact primary crushing. It achieves a higher working hardness (over HRC 60) faster, making it vastly superior for abrasive hard rock like granite or quartzite.
Q2: Can these liners really handle 1.5-meter boulders without cracking?
A2: Yes. The extra-coarse cavity is volumetrically designed to accept boulders up to 1.5 meters. Furthermore, the heavy-section casting (up to 50mm in critical stress areas) provides the immense structural strength required to absorb the kinetic shock of primary reduction without suffering structural fatigue or catastrophic cracking.
Q3: What happens if the liners do not fit our existing 7FT Extra Coarse crusher?
A3: We manufacture these components strictly according to the original equipment blueprints and tolerances. We provide a 100% OEM Fit Guarantee. In the highly unlikely event of a dimensional discrepancy preventing installation, our warranty covers immediate replacement or compensation, ensuring zero risk on your end.
Q4: Do you offer solutions for highly abrasive ores that wear down manganese too quickly?
A4: Absolutely. For extreme wear environments, we offer customized upgrades, including Titanium Carbide (TIC) insertions or ceramic matrix composites embedded within the high-manganese steel. These hybrid solutions drastically improve wear resistance and can extend the service life by 2 to 3 times compared to standard manganese steel, lowering your overall cost per ton.
Q5: How do you ensure the internal integrity of such thick steel castings?
A5: Every heavy-section casting undergoes rigorous non-destructive testing (NDT) before it leaves our facility. We utilize advanced ultrasonic flaw detection to scan deep within the 50mm cross-sections, ensuring there are no hidden shrinkage cavities, gas porosity, or internal micro-cracks that could compromise performance under heavy impact.
