What is the expected service life of this moving jaw plate in granite crushing?

In primary granite crushing with a feed size of 0–600 mm and a throughput of 500–800 t/h, this Mn18Cr2 moving jaw plate typically lasts 1,500–2,500 hours before reaching the wear limit (when the tooth height is reduced by 60–70%). The exact life depends on the feed gradation, moisture content, and crusher settings. For basalt, which is more abrasive, expect the lower end of this range (1,500–1,800 hours). To maximize life, maintain a consistent closed-side setting and avoid feeding material that is too fine (which reduces the work-hardening effect). Regular inspection every 250 hours is recommended to monitor wear profile and bolt torque.

Can this plate be used in a Metso C106 crusher without modification?

Yes. This moving jaw plate is designed as a direct-fit replacement for the Metso C106 jaw crusher. The bolt hole pattern, overall dimensions, and mounting surface flatness (≤0.5 mm) match the OEM specifications. No machining or adaptation of the jaw stock is required. However, always verify the wedge and bolt condition before installation: worn wedges can cause the plate to shift, leading to uneven wear or bolt failure. Torque the bolts to the OEM specification (typically 800–1,000 Nm for M24 bolts) in a crosswise pattern, and re-torque after the first 50 hours of operation.

How does Mn18Cr2 compare to Mn13Cr2 for this application?

Mn18Cr2 offers a better balance of toughness and wear resistance for primary crushing than Mn13Cr2. The higher manganese content (17–19% vs. 11–14%) stabilizes the austenitic structure, allowing more work-hardening without becoming brittle. In abrasive applications like granite, Mn18Cr2 typically provides 10–15% longer wear life than Mn13Cr2. However, Mn13Cr2 may be preferred in very high-impact applications with large tramp metal, as its lower carbon content makes it slightly more ductile. For most standard quarry operations with moderate tramp metal risk, Mn18Cr2 is the recommended grade.

What is the proper installation procedure for this moving jaw plate?

Installation should follow these steps: (1) Clean the jaw stock mounting surface and remove any burrs or debris. (2) Check the wedge and bolts for wear; replace if deformed. (3) Lift the plate into position using the lifting eye bolts (never lift by the teeth). (4) Align the bolt holes and insert bolts finger-tight. (5) Tighten bolts in a crosswise pattern to 50% of final torque, then to 100% (typically 800–1,000 Nm for M24). (6) Check the gap between the plate and jaw stock with a feeler gauge; it should not exceed 0.1 mm at any point. (7) After 50 hours of operation, re-torque all bolts to compensate for settling. Always use new self-locking nuts and hardened washers.

Moving Jaw Plate

Mn18Cr2 Moving Jaw Plate for C106/PE-600×900 Jaw Crushers – 500 HB Work-Hardened Surface

The moving jaw plate is the primary wear component in a jaw crusher, directly contacting and compressing feed material against the fixed jaw. This specific plate is cast from high-manganese steel (Mn18Cr2) with a controlled austenitic microstructure, delivering surface hardness from 220–250 HB in as-cast condition and work-hardening to approximately 500 HB under repeated impact.

Material Grade

High-Manganese Steel (Mn18Cr2)

Tensile Strength

≥ 850 MPa

Standard Jaw Crusher Models

C106, C110, PE-600×900, PE-750×1060

Service Life (Typical)

1,500–2,500 hours depending on feed material

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How Does the Mn18Cr2 Moving Jaw Plate Perform in Continuous Crushing?

The moving jaw plate described here is a heavy-duty wear part cast from Mn18Cr2 high-manganese steel, specifically dimensioned for standard jaw crushers such as the Metso C106 (feed opening 1,060 × 700 mm) and PE-600×900 (feed opening 600 × 900 mm). Its nominal thickness ranges from 80 to 120 mm at the crushing zone, with a tooth height of 25–35 mm and a tooth pitch of 60–80 mm. The as-cast hardness of 220–250 HB is intentionally lower than that of martensitic steels to allow plastic deformation under high-stress impact; during operation, the surface work-hardens to approximately 500 HB while the core retains toughness (≥120 J Charpy V-notch at 20°C). This gradient structure is what enables the plate to absorb tramp metal impacts without through-cracking, a common failure mode in harder but more brittle alloys. The mounting bolt holes are positioned to match OEM hole patterns, and the backing surface is machined to a flatness of 0.5 mm or better to ensure full contact with the jaw stock.

In typical quarry and mining operations, this moving jaw plate is deployed in primary crushing circuits where feed material ranges from 0–600 mm and compressive strength reaches 300 MPa. The optimized tooth profile—a combination of tall trapezoidal teeth and deep valleys—creates a aggressive nip angle that pulls material down efficiently while distributing wear across the entire plate surface. This is particularly beneficial when processing abrasive materials like granite or basalt, where wear is concentrated at the discharge end. Field data from aggregate plants shows that this profile extends the usable wear life by 15–20% compared to standard symmetric tooth patterns, because the taller teeth maintain a consistent crushing chamber geometry even as the plate wears. The plate is also suitable for recycling applications (concrete rubble) where occasional rebar or tramp metal is present; the high toughness prevents catastrophic fracture, though operators should still install a tramp iron release system.

Compared to other manganese steel grades such as Mn13Cr2 or Mn22Cr2, this Mn18Cr2 plate offers a balanced compromise: higher carbon content (1.7–1.9%) than Mn13 for better work-hardening response, but not as high as Mn22 which can lead to excessive brittleness in thin sections. The chromium addition (2.0–2.5%) improves hardenability and resistance to abrasive wear without compromising the austenitic matrix. When compared to the fixed jaw plate in the same crusher, the moving plate typically experiences 10–15% more wear due to its larger stroke and the sliding action against the material; therefore, this plate is designed with a slightly thicker cross-section (up to 10 mm additional) at the discharge zone to equalize replacement intervals. This attention to application-specific wear patterns is what differentiates a properly engineered wear part from a generic casting.

Verified impact toughness of ≥120 J at 20°C (Charpy V-notch, tested per ASTM E23), reducing the risk of catastrophic cracking from tramp metal.
Work-hardened surface hardness of approximately 500 HB after 100 hours of operation, providing wear resistance comparable to martensitic steels while maintaining a tough core.
Precision-machined mounting surface (flatness ≤0.5 mm) and OEM-compatible bolt hole pattern for Metso C106/C110 and PE-600×900/PE-750×1060 crushers, ensuring drop-in fit and reduced installation downtime.

Core Technical Features and Quantified Advantages

STEP 1

Mn18Cr2 Austenitic Steel with 500 HB Work-Hardened Surface

The plate is cast from high-manganese steel with a nominal composition of 1.7–1.9% C, 17–19% Mn, and 2.0–2.5% Cr. In the as-cast condition, hardness is 220–250 HB, but repeated impact during crushing work-hardens the surface to approximately 500 HB while the core remains tough (≥120 J impact toughness). This gradient structure is verified through microhardness mapping across the cross-section, ensuring a wear-resistant surface without sacrificing resistance to cracking.

STEP 2

Optimized Tooth Profile for 15–20% Longer Wear Life

The tooth geometry features a 25–35 mm tooth height and 60–80 mm pitch, creating an aggressive nip angle that improves material flow and distributes wear evenly. Field tests in granite quarries show that this profile maintains a consistent crushing chamber gap as the plate wears, extending usable life by 15–20% compared to symmetric tooth designs. The deeper valleys also allow material to pack and form a autogenous wear layer, further reducing metal loss.

STEP 3

Precision-Machined Mounting Surface (Flatness ≤0.5 mm)

The backing surface of the plate is machined to a flatness tolerance of 0.5 mm or better, ensuring full contact with the jaw stock and eliminating point loading that can cause bolt fatigue or plate cracking. Bolt holes are positioned to match OEM patterns for Metso C106/C110 and PE-600×900/PE-750×1060 crushers, allowing drop-in replacement without modification. This precision reduces installation time by up to 30% and minimizes the risk of loose bolts during operation.

STEP 4

Verified Impact Toughness ≥120 J at 20°C

Charpy V-notch impact tests per ASTM E23 confirm a toughness of at least 120 J at room temperature, which is critical for primary crushing where tramp metal may enter the chamber. This toughness allows the plate to absorb impact energy through plastic deformation rather than brittle fracture. For operators, this translates to fewer unplanned shutdowns and lower risk of damage to the jaw stock, toggle plate, and frame. The heat treatment cycle is also controlled to avoid carbide precipitation at grain boundaries, which can embrittle the steel.