Raw Material Crusher Hammer
Cement Plant Raw Material Crusher Hammer / Limestone Hammer — Single-Hole Suspension Type — Mn13Cr2 / Mn18Cr2 / Cr20 / Hardfaced Composite — For Limestone / Clay / Marl
Raw Material Crusher Hammer
Material Specifications & Selection Guide
| Grade | Material | As-Cast HB | Work-Hardened | Impact | Application |
|---|---|---|---|---|---|
| Mn13 | Hadfield Steel (Mn12-14%) | 200-220 | 450-550 HB | Excellent | Limestone, soft rock |
| Mn13Cr2 | High Mn + Cr2% | 210-230 | 500-600 HB | Excellent | Standard raw material |
| Mn18Cr2 | High Mn + Cr2% (Mn17-19%) | 220-240 | 550-650 HB | Superior | Hard rock, large feed |
| Mn22Cr2 | High Mn + Cr2% (Mn20-22%) | 230-250 | 600-700 HB | Superior | Extreme impact, SAG pre |
| Mn13Mo | High Mn + Mo0.5-1.0% | 210-230 | 480-580 HB | Excellent | High temp, sticky material |
| Grade | Material | Hardness | Carbide | Life Factor | Application |
|---|---|---|---|---|---|
| Cr15 | Medium Cr White Iron | 56-60 HRC | 22-30% | 2.0-2.5x | Abrasive, low impact |
| Cr20 | High Cr White Iron | 58-62 HRC | 25-33% | 2.5-3.0x | Sand, silica material |
| Cr26 | Ultra High Cr | 58-63 HRC | 28-38% | 3.0-3.5x | Extreme abrasion |
| Mn13+Cr Insert | Mn base + Cr carbide | 58-62 HRC tip | High | 2.5-3.0x | Balanced impact + wear |
| TiC Composite | Mn + TiC reinforcement | 60-65 HRC | TiC particles | 3.5-4.0x | Maximum wear resistance |
| Crusher Type | Model/Size | Hammer Weight (kg) | Qty/Set | Material | Rec. Grade |
|---|---|---|---|---|---|
| Hammer Crusher | PC400x300 to PC1000x800 | 10-35 | 24-72 | High Mn / High Cr | Mn13Cr2 / Cr20 |
| Hammer Crusher | PC1200x1000 to PC1600x1600 | 40-120 | 48-96 | High Mn Steel | Mn18Cr2 / Mn22Cr2 |
| Impact Crusher | PF1007 to PF1820 | 15-80 | 6-16 | High Cr / High Mn | Cr20 / Mn13Cr2 |
| Reversible Crusher | PCK series | 20-60 | 40-80 | High Mn Steel | Mn18Cr2 / Mn22Cr2 |
| Ring Hammer | PCH series | 8-25 | 36-72 | High Mn Steel | Mn13Cr2 |
| Single Stage | DPC series | 30-100 | 32-64 | High Mn / Composite | Mn18Cr2+Cr Insert |
| Heavy Duty | DHD series | 80-200 | 24-48 | High Mn Steel | Mn22Cr2 / TiC |
| Shredder | Metal/Scrap | 50-150 | 20-40 | High Cr / Alloy | Cr26 / Mn18Cr2 |
Selection Quick Reference
- Limestone, soft raw material (standard duty): Mn13Cr2 hammer — work-hardens to 500-600 HB under impact, excellent for cement plant raw material crushing, service life 2-4 months depending on silica content
- Hard rock, large feed size (>300 mm): Mn18Cr2 or Mn22Cr2 — higher Mn content provides superior toughness for large boulders and hard limestone, reduces catastrophic failure risk
- Sandstone, silica abrasive material: Cr20 or Cr26 high chrome hammer — maximum carbide content resists silica abrasion, suitable for low-impact high-wear applications
- Composite solution (balanced impact + wear): Mn13 base with Cr carbide insert — combines toughness of manganese with wear resistance of high chrome, extends life 2.5-3.0x vs standard Mn13
- Extreme wear with moderate impact: TiC (titanium carbide) reinforced Mn steel — TiC particles provide 3.5-4.0x life for severely abrasive materials like quartz or high-silica ore
- High-temperature or sticky material: Mn13Mo — Mo addition improves high-temperature strength and reduces sticking of clay-rich materials, maintains performance up to 350 C
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Engineering Review
Material recommendation, casting process design, DFM analysis — free quotation within 24 hours
Sampling & Test
Prototype production with full inspection: hardness test, spectrometer, dimensional check
Production & Ship
ISO 9001 certified. 15-25 days standard lead time. Global shipping with full documentation
Frequently Asked Questions
Quick answers to common questions about our crusher hammers
Hammer material selection depends on impact vs. abrasion balance. The wrong choice leads to premature failure:
- High manganese (Mn13/Mn18): Requires continuous impact to work-harden (200 HB → 500-600 HB). Use when feed exceeds 80 mm and hammer speed above 20 m/s. Without impact, wear is rapid.
- High chrome (Cr20/Cr26): Hard from the start (58-63 HRC as-cast). Best for fine, abrasive materials (0-80 mm) and low-impact applications. Cr26 resists silica abrasion 3x better than Mn13.
- Composite solution (Mn13+Cr Insert): Mn body absorbs impact while Cr carbide inserts resist abrasion — extending life 2.5-3.0x in mixed conditions.
Decision rule: Impact sound + sparks → use Mn steel. Silent, smooth wear → use Cr white iron. When in doubt, trial 2 hammers of each in the same rotor — compare wear within 200 hours.
Reversible crushers allow bi-directional rotation for even wear on both hammer edges:
- Non-reversible: Single wear surface, flipped 180 after one edge wears. Typically high manganese (Mn18Cr2). Use 50-60% of hammer weight before replacement.
- Reversible: Symmetrical design with two identical edges. Direction reverses periodically. Use Cr20 or Mn13+Cr composite since alternating prevents Mn work-hardening. Uses 60-80% of weight.
- Result: Reversible hammers achieve 1.5-2x longer life even with 15-25% higher cost — net 20-35% lower cost per ton.
Limitation: Not for materials with embedded tramp metal. Sudden reversal under load can seize the rotor. Use with metal detector + magnetic separator upstream.
Improper installation is the #1 cause of premature failure in hammer crushers:
- Weight matching: Hammers on opposite rotor arms must match within 0.3 kg. A 1 kg imbalance at 1000 RPM generates ~11 kN centrifugal force — enough to destroy bearings in hours.
- Install sequence: Heaviest hammers on centre discs, lighter on edges. Follow rotation marking — reversing a Mn hammer prevents work-hardening.
- Gap control: 10-25 mm hammer-to-screen. <5 mm causes metal-on-metal wear; >30 mm allows bypass. Re-check after 24 hours as new hammers settle.
- Maintenance schedule: Re-torque after 4 hours initial; daily visual inspection; replace by full rows or quadrants — never replace a single hammer.
Safety critical: Lock the rotor with a mechanical pin before entry + LOTO electrical. Rotor momentum can rotate even with power disconnected. Crushing fatalities are the most common accident in hammer crusher maintenance.
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