I. Material Characteristics: Core Advantages of High-Chromium Alloy
High-chromium alloy is a wear-resistant material with chromium as the main alloying element, featuring the following properties:
1. Ultra-High Hardness and Wear Resistance
- Hardness reaches HRC 58-65 (Rockwell hardness), far exceeding ordinary manganese steel (approximately HRC 20-30) and low-alloy steel. It effectively resists impact wear and cutting wear during ore crushing.
- Suitable for crushing high-hardness ores such as quartzite, granite, and basalt, with a service life 2-3 times longer than ordinary materials.
2. Good Impact Toughness
- By reasonably regulating the proportions of chromium, carbon, molybdenum, nickel, and other elements, the shortcoming of traditional high-chromium cast iron being "hard and brittle" is addressed. It balances hardness and fracture resistance, making it less prone to cracking under impact loads.
3. Corrosion and High-Temperature Resistance
- The oxide film formed by chromium resists corrosion from acidic ores (such as pyrite). Meanwhile, it maintains stable performance in high-temperature environments below 300°C , suitable for complex working conditions.
II. Structural Design: Optimizing Crushing Efficiency and Reliability
1. Scientific Geometric Shape
- The head of the plate hammer adopts an arc or trapezoidal design to increase the contact area with ores and enhance impact crushing force. The tail is thickened and equipped with installation slots to ensure stability during high-speed rotation.
- The edge angle is optimized according to crusher models (such as Φ1000×700, Φ1250×1050, etc.) to match the rotor linear velocity (25-50m/s), reducing ineffective friction.
2. Precision Manufacturing Process
- Uses lost foam casting or vacuum melting technology to avoid defects such as air holes and slag inclusions, resulting in a uniform and dense internal structure with a hardness consistency error of <±2HRC.
- The surface undergoes laser quenching or carburizing treatment to further improve surface wear resistance and extend service life.
3. Convenient Installation and Replacement
- Modular design supports quick disassembly and assembly . Combined with fixing methods such as wedges and bolts, it shortens downtime for maintenance and improves equipment operation rate.
III. Working Performance: Core Performance in Crushing Scenarios
1. Efficient Crushing Capacity
- In impact crushers, high-chromium alloy plate hammers perform multi-stage "impact-counterattack-crushing" on ores through high-speed rotation (rotational speed up to 500-1500r/min), producing uniformly sized materials (up to 0-30mm), with a high proportion of fine materials and reduced over-crushing.
- Processing capacity is 15%-20% higher than ordinary plate hammers, with single-machine hourly output ranging from 50 to 300 tons (specifically depending on the machine type and ore hardness).
2. Low Loss and Economy
- Wear mainly occurs at the head edge, which can be reused through surfacing repair , reducing single replacement costs. The comprehensive cost-performance ratio is 30%-50% higher than manganese steel plate hammers.
- Reduces downtime caused by component replacement, especially suitable for large-scale continuous mining operations.
3. Adaptability and Customization
- Can customize plate hammer size, hardness, and alloy composition (such as increasing molybdenum content to enhance high-temperature performance) according to customer needs, adapting to different brands of crushers (such as , , and domestic heavy industry models).
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