Company Hammer Product Introduction
The hammer is a wear part for crushers and ball mills. KmTBCr15Mo high chromium cast iron is an abrasion-resistant white cast iron material specifically designed for secondary and tertiary fine crushing applications in mining, cement, aggregate, and coal processing industries. Our fine crusher hammer achieves excellent wear resistance while maintaining adequate impact toughness through the combined addition of high chromium and molybdenum, making it suitable for various complex impact crushing environments.
KmTBCr15Mo belongs to the chromium-molybdenum series of abrasion-resistant cast iron, with its material designation following the GB/T 8263 standard. In this designation, "KmT" stands for abrasion-resistant cast iron, "Cr15" indicates a chromium content of approximately 15% for improved wear and corrosion resistance, and "Mo" represents the addition of molybdenum to enhance hardenability and red hardness at elevated temperatures. This high chromium cast iron is widely recognized as one of the most effective wear-resistant materials for components subjected to high impact and severe abrasive wear, including fine crusher hammers, mill liners, and slurry pump wear parts.
Key Features at a Glance
- Material Grade: KmTBCr15Mo High Chromium White Cast Iron (GB/T 8263)
- Hardness (After Heat Treatment): ≥58 HRC / ≥650 HBW
- Chromium Content: 11.0% – 18.0%
- Molybdenum Content: ≤3.0% (for hardenability)
- Heat Treatment Process: Quenching + Tempering (per GB/T 8263)
- Applicable Equipment: Hammer crushers, fine crushers, impact crushers, reversible fine crushers
Chemical Composition (Mass Fraction wt.%)
| Element | C | Cr | Mo | Mn | Si | Ni | Cu | P | S |
| Range (%) | 2.0 – 3.3 | 11.0 – 18.0 | ≤ 3.0 | ≤ 2.0 | ≤ 1.2 | ≤ 2.5 | ≤ 1.2 | ≤ 0.10 | ≤ 0.06 |
Mechanical Properties
| Property | Value |
| Hardness (As-Cast / Stress-Relieved) | ≥46 HRC / ≥450 HBW |
| Hardness (Hardened / QT) | ≥58 HRC / ≥650 HBW |
| Hardness (Soft-Annealed) | ≤41 HRC / ≤400 HBW |
| Impact Toughness | ≥6–10 J/cm² (Charpy V-notch) |
Heat Treatment Process
All KmTBCr15Mo fine crusher hammers undergo strict heat treatment in accordance with GB/T 8263 specifications:
- Soft Annealing (for machining): 920–960°C soak 1–8h, slow cool to 700–750°C hold 4–8h, then air cool or furnace cool below 600°C
- Hardening Treatment: 920–980°C soak 2–6h, air cool
- Stress Relief (Tempering): 200–300°C soak 2–8h, air cool or furnace cool
The quenching and tempering process transforms the microstructure to martensite matrix with uniformly distributed M₇C₃ carbide particles, achieving the optimum balance of hardness and impact resistance.
Performance Advantages
Exceptional Abrasion Resistance
The high chromium content in KmTBCr15Mo forms M₇C₃ carbides (HV 1500–1800) within a martensitic matrix. This structure delivers 3–5 times greater wear resistance than high manganese steel and 2–3 times that of low alloy wear-resistant steel, making it ideal for continuous high-wear fine crushing.
01
Optimized Toughness for Impact Loading
Unlike traditional "hard but brittle" high chromium irons, KmTBCr15Mo achieves a balance of ≥58 HRC surface hardness and 6–10 J/cm² impact toughness through molybdenum refinement and controlled carbon content, reducing crack or chip risks when processing tramp metal or oversize particles.
02
Elevated Temperature Performance
Molybdenum addition provides red hardness retention above 80% at operating temperatures up to 600°C, preventing friction-induced wear acceleration common in high-duty crushing.
03
Corrosion Resistance
The chromium content forms a Cr₂O₃ passive film, offering effective protection in acidic, alkaline, or wet conditions-critical for wet crushing, slag processing, or corrosive feed materials.
04
Consistent Dimensional Stability
With low casting shrinkage (1.2–1.5%) and minimal residual stress after heat treatment, KmTBCr15Mo hammers maintain dimensional accuracy throughout service life, ensuring rotor balance and preventing loosening or deformation.
05
Applications
KmTBCr15Mo fine crusher hammers are used for secondary/tertiary fine crushing in:
- Mining: Iron, copper, gold, phosphate ores
- Cement: Limestone, clinker, gypsum, raw meal
- Aggregate: Granite, basalt, diabase, river pebbles
- Coal: Crushers, breakers, preparation plants
- Metallurgy: Slag, ferrosilicon, coke
- Power: Coal pulverizers, limestone desulfurization
- Construction: Concrete, brick, glass recycling
Ideal for hammer crushers, reversible fine crushers, impact crushers, and VSIs in medium-to-high abrasion environments where manganese steel wears too fast and ultra-high chromium is overkill.
Why Choose Our KmTBCr15Mo Fine Crusher Hammer?
Casting
Resin sand & lost foam casting. 1450±30°C pouring, controlled cooling (8–12h). Lost foam achieves CT8–CT10 accuracy, Ra6.3–12.5μm finish – no flash or burrs.
Heat Treatment
Full GB/T 8263 cycle in computer-controlled furnaces. Consistent hardness across entire hammer. Rockwell/Brinell tested per batch.
Quality
Traceable raw materials, spectrometer inspection, 100% hardness test, NDT (MPI), CMM dimensional check.
Custom Manufacturing
Made to your drawings or reverse-engineered for any crusher model. Tooling and patterns developed in-house.
Our Service Commitment
- Responsive Quotations: Drawing-based quotes within 24–48 hours
- Flexible Order Quantities: From sample quantities to full container loads
- On-Time Delivery: Reliable shipping with tracking and customs documentation support
- Technical Support: Application engineering assistance for material selection and wear optimization
- After-Sales Service: Quality issue resolution and continuous improvement collaboration
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