Sandvik CH870 Mantle 452.0845-002 | Mn18Cr2 Cone Crusher Spares

Sandvik CH870 Mantle 452.0845-002 | Mn18Cr2 | Extra Fine (EF) Chamber

The Sandvik Mantle 452.0845-002 is the dynamic wear component specifically engineered for the Extra Fine (EF) crushing chamber of the Sandvik CH870 (H7800) cone crusher. Weighing over 2 tons, this massive casting is the heart of the cone crusher bowl and mantle assembly, designed to produce fine aggregate products (typically < 10mm) in tertiary or quaternary applications.

As a leading crusher parts supplier, we manufacture this mantle using premium Mn18Cr2 (ASTM A128 Grade C) manganese steel. Unlike standard Mn13 parts, our alloy includes 2% Chromium to stabilize the grain structure, preventing the “plastic flow” or mushrooming of the mantle bottom that often plagues high-pressure Hydrocone crushers.

Core Engineering: The “EF” Chamber Advantage

Selecting the correct part number is vital. The 452.0845-002 is an EF profile.

• Application: Designed for fine crushing where the closed side setting (CSS) is tight (e.g., 6-13mm).
• Feed Size Limit: EF mantles restrict the maximum feed size to prevent bridging. Installing this mantle for coarse feed will reduce capacity by 40%.
• Matching Requirement: For optimal crushing geometry, this mantle MUST be paired with the corresponding EF Bowl Liner. Mismatched crusher spares will destroy the crushing chamber profile.

Performance Comparison: Mn18Cr2 vs. Mn13Cr2

In high-abrasion silica environments, material choice dictates your ROI. Our Mn18Cr2 mantles offer superior work-hardening capabilities.

Engineer’s Maintenance Tips (Information Gain)

How to determine if your Mantle 452.0845-002 is worn out?
Do not rely solely on hours. Use these physical indicators:

1. The “25mm” Rule: Generally, when the liner thickness at the wear zone is reduced to approx. 20-25mm, the risk of cracking increases exponentially due to the loss of structural section.
2. Production Drop: If you notice a 15% drop in tons/hour while drawing the same amps, the mantle profile has likely lost its “nip angle.” The rock is slipping rather than crushing.
3. Installation Tip: When installing the 452.0845-002, always replace the Burning Ring (Torch Ring). The Main Shaft Head Nut relies on the mantle acting as a locking washer. If the mantle seats poorly, the Head Nut can loosen, causing catastrophic shaft damage.