Cast Impact Crusher Parts: Blow Bars and Impact Plates
Wear parts for horizontal-shaft impact crushers (HSI): blow bars for impact crushers and impact plates (breaker plates), cast in our own foundry. In an impactor, material is thrown from the rotor at 25–40 m/s onto the impact plates and struck again by the blow bars — both surfaces are consumables whose grade decides how long between liner changes. See the full crusher wear parts catalog for jaw and cone crusher parts, and our metal casting capability for custom work.
Blow Bars for Impact Crushers
| Material | Hardness | Impact toughness | Best for |
|---|---|---|---|
| High-chromium white iron, 15% Cr | HRC 58–65 | 5–8 J/cm² (Cr26 class) | Limestone, medium-hard feed — best wear per cost |
| High-chromium white iron, 20–26% Cr | HRC 58–65 (Cr26 HRC 60+) | As above | Granite, high-abrasion feed |
| Martensitic alloy steel | HRC 48–55 | ≥ 15 J/cm² | High impact, large feed — resists breakage |
| Composite (Hi-Cr working face + low-alloy back) | Face HRC 58+ | Back tough | Extreme impact + abrasion |
Unlike manganese steel, high-chromium blow bars do their work at full hardness out of the box — no work-hardening needed, which is why they outlast Mn13 bars in low-to-medium impact duty, wearing at 60–70% of the manganese rate. Where feed is blocky and impact severe, martensitic alloy bars resist cracking that would chip a full-hard iron bar. Typical bar weights 15–220 kg; fits PF-1010/1210/1315/1520 and common impactor models, with length, thickness and bolt pattern cast to the machine. For the full material selection logic, see our impact crusher blow bar selection guide.
Impact Plates (Breaker Plates)
First-stage (primary) plates take the hardest hits — usually thicker sections in Mn18Cr2 (as-cast HB 180–260, work-hardening to HB 450+); second-stage plates see less impact and more abrasion, where Cr26 iron (HRC 58–62) delivers 1.5–2× the wear life of manganese. The plate-to-rotor gap sets product size and is adjustable at installation. Composite castings (Hi-Cr face, steel back) solve the “hard-but-brittle vs tough-but-soft” trade-off in severe duties. Thickness 50–120 mm typical, 30–300 kg per piece.
Manufacturing and Quality Control
Lost-foam casting for large bars, resin-sand precision casting for smaller ones; quench + temper promotes the M₇C₃ carbide morphology that carries the hardness; furnace-front temperature check plus sample-block chemistry before every pour; 100% hardness check (three points per bar); microstructure and dimensional verification; ISO 9001; material and test reports supplied.
Request a Quote
Send the machine model or the worn part — quote within 24 hours. Samples available for wear-trial validation before volume orders.
