The jaw plate is the primary wear part of a jaw crusher — the fixed and movable plates that crush stone, clinker, and raw materials by compression. LIMING manufactures high-manganese and Mn-Cr alloy jaw dies with superior work-hardening properties for maximum service life.
In a jaw crusher, material is crushed between two jaw plates: the fixed jaw plate mounted to the front frame and the movable jaw plate attached to the swing jaw. As the eccentric shaft drives the swing jaw forward, material is compressed between the corrugated tooth surfaces of the two plates and fractured. When the jaw retracts, the crushed material drops down and is re-crushed on the next cycle until it passes through the discharge opening.
Jaw plates are the highest-consumption wear part in any jaw crusher operation. The abrasive nature of cement raw materials — limestone, shale, clinker, bauxite, and quartzite — causes continuous surface wear on the tooth profiles. LIMING's jaw plates are engineered from high-manganese steel alloys that work-harden under impact, meaning the surface becomes progressively harder during operation while the interior remains tough and crack-resistant.
We produce jaw plates for all major jaw crusher models including PE series, PEX series, and equivalent designs from other manufacturers. Custom tooth profiles (straight, corrugated, sharp-tooth) and plate dimensions are manufactured to your drawings or reverse-engineered from worn samples.
Selecting the correct material grade is critical for maximizing jaw plate life. The optimal choice depends on feed material hardness, feed size, crushing ratio, and the abrasiveness of the rock being processed:
| Material Grade | Composition | Initial Hardness (HB) | Work-Hardened Hardness | Best For |
|---|---|---|---|---|
| Mn13 | Hadfield steel, ~13% Mn | 200-230 | up to 450 HB | Standard limestone, medium-abrasive feed |
| Mn13Cr2 | 13% Mn + 2% Cr | 220-250 | up to 500 HB | Abrasive limestone, granite, higher wear resistance |
| Mn18 | High Mn, ~18% Mn | 210-240 | up to 480 HB | High-impact applications, large feed size |
| Mn18Cr2 | 18% Mn + 2% Cr | 230-260 | up to 550 HB | Most abrasive and high-impact conditions |
The addition of chromium (Cr2) enhances wear resistance and delays surface cracking under heavy impact loads. For cement plants crushing hard or abrasive limestone, Mn13Cr2 provides the best balance of cost and performance. For extremely abrasive conditions — such as crushing quartzite or high-silica ores — Mn18Cr2 delivers the longest service life.
Understanding jaw plate wear patterns helps optimize crusher operation and plate selection. In a typical jaw crusher, the crushing action is not uniform across the plate surface:
Many operations extend jaw plate life by flipping the plates (rotating top-to-bottom) at 50% wear, which restores the crushing profile and distributes wear more evenly. LIMING designs plates with symmetrical tooth profiles where possible to enable flipping.
AGICO-quality wear parts with superior metallurgy and precision manufacturing.
Strict control of Mn, C, and Cr content ensures optimal work-hardening response and consistent wear life.
Every plate is water-quenched after casting to preserve the austenitic structure — essential for work-hardening.
Corrugated, sharp-tooth, or flat profiles engineered to your feed material and crushing requirements.
Common jaw plate sizes stocked for immediate shipment. Custom plates produced in 15-30 days.
| Parameter | Specification |
|---|---|
| Product Type | Fixed jaw plate / Movable jaw plate |
| Material Options | Mn13, Mn13Cr2, Mn18, Mn18Cr2 |
| Manufacturing | Sand casting → water toughening → machining |
| Dimensions | Custom per crusher model or drawings |
| Tooth Profile | Straight, corrugated, sharp-tooth, custom |
| Initial Hardness | 200-260 HB |
| Work-Hardened Hardness | 450-550 HB (under service impact) |
| Tensile Strength | ≥735 MPa |
| Elongation | ≥25% |
| Heat Treatment | Water toughening (solution treatment) at 1050-1100°C |
| Compatible Crushers | PE/PEX series and equivalents |
| Lead Time | 15-30 days (stock items ship immediately) |
Wood or metal patterns created to match the exact tooth profile and plate dimensions.
High-manganese steel melted and poured into sand molds under controlled conditions.
Solution treatment at 1050-1100°C followed by rapid water quench to retain austenite.
Drilling of mounting holes and surface cleaning. Tooth profiles left as-cast.
Hardness testing, dimensional check, and visual crack inspection before packing.