Jaw Plates or Jaw Dies are the most frequently replaced wear parts of the jaw crusher, so the quality of the jaw die is one of the most important factors that determine the crushing efficiency and operating time.
A set of jaw plates are composed of the movable (swing jaw) and fixed jaw plate (stationary jaw). Compression of material undergoing crushing in a jaw crusher is achieved when the movable jaw die presses the feed against the fixed jaw die. The rock remains in the jaw of the crushing machine until it is small enough to pass through the gap towards the bottom of the jaws.
| Material | Chemical Composition (%) | Machanical Property | ||||
| Mn | Cr | C | Si | Ak/cm | HB | |
| Mn13Cr2 | 12-15 | 1.7-2.2 | 1.15-1.25 | 0.3-0.8 | ＞140 | ≤220 |
| Mn18Cr2 | 17-19 | 1.8-2.2 | 1.15-1.3 | 0.3-0.8 | ＞140 | ≤230 |
| Mn22Cr2 | 21-23 | 1.8-2.2 | 1.1-1.4 | 0.3-0.8 | ＞140 | ≤240 |