Wear Resistant Hammer For Various Hammer Crusher Models Ore Mining Spare Parts

The crusher hammer head, specifically for hammer crushers, is one of the core wear-resistant parts of hammer crushers. It is mounted on the hammer shaft of the crusher rotor. When the crusher runs at high speed, the hammer head strikes materials directly and crushes them to the required particle size.

Hammer heads available on the market are divided into cast and forged types according to manufacturing processes, with different performance characteristics. Hammer heads require excellent wear resistance on the striking end and sufficient toughness on the shank to meet crushing demands. Therefore, alloy steel, high manganese steel, and bimetallic composite materials (cast steel + high chromium cast iron) are widely adopted. They are integrally formed by forging or casting with matched heat treatment processes for good cost efficiency.

Classified by material, hammer heads mainly include high manganese steel hammer heads, bimetallic composite hammer heads, large gold-tooth hammer heads, medium chromium alloy hammer heads and cemented carbide hammer heads.

The key factor for hammer head selection is the silicon dioxide (SiO₂) content in the crushed materials. In modern crushing operations, cemented carbide hammer heads are widely popular for outstanding wear resistance. Our hammer heads feature high wear resistance and a long service life.

Adopting a dedicated fusion process, two metals with different properties are metallurgically bonded in a liquid state with a bonding ratio up to 100%. The impact toughness of the bonding surface reaches 14 J/cm² or above.

The working end is made of high chromium cast iron with directional solidification technology. It enables Cr₇C₃ carbides to be vertically distributed on the working surface, reaching a hardness of HRC 62–65 and impact toughness AK ≥ 30 J/cm². It resists cutting wear from hard phases such as Al₂O₃ and SiO₂ and delivers superior wear resistance. The shank features high strength, toughness and reliable comprehensive mechanical properties.

This material well balances high hardness and high toughness and solves the conflict between the two, adapting to various complicated and harsh working conditions.

The service life of bimetallic composite hammer heads is 2–3 times that of traditional high manganese steel hammer heads. They are especially suitable for large crusher hammer heads, blow bars and large ball mill liners, showing remarkable performance under severely abrasive conditions. They are widely used for crushing hard materials including limestone, cement clinker, iron ore, sandstone, gangue and basalt.

High manganese steel refers to high alloy steel with a manganese content above 10%. It features work-hardening performance: Greater external compressive stress or impact load accelerates the formation of a hardened layer on the surface, improving wear resistance. As the surface hardened layer wears away, new work-hardened layers continuously form under ongoing compressive stress and impact load. Hence it is ideal for wear spare parts enduring long-term high-impact abrasion, widely used in crushing and grinding equipment for metallurgy, mining, building materials, railways, electric power and coal industries.

After proper alloying and targeted processing, cast wear parts such as high chromium cast iron blow bars and hammer heads achieve a through-section hardness above HRC 58 and maintain high hardness and wear resistance during abrasion.

Directional solidification is applied on the working surface to arrange M₇C₃ carbides perpendicularly. Without sacrificing toughness, both the macro hardness of the matrix and microhardness of carbides are improved.

Suitable for wear-resistant spare parts with simple shapes and under relatively low impact loads.

It is alloy cast iron, an iron-carbon alloy produced by adding one or more alloying elements to ordinary carbon steel.

By adjusting alloy composition together with customized smelting and heat treatment processes, it can obtain special properties such as high strength, high toughness, excellent wear resistance, corrosion resistance, low-temperature resistance, high-temperature resistance and non-magnetism.

Used for wear-resistant spare parts requiring good comprehensive mechanical properties with proper strength and toughness, as well as main structural castings bearing dynamic loads.

Alloy white cast iron containing 10~30% chromium has prominent advantages:

1. When chromium content hits 12%, Cr₇C₃ carbides form with microhardness of HV 1300–1800, much higher than Fe₃C hard phases (HV 800–1100) in ordinary white cast iron, delivering excellent wear resistance.
2. Carbides present fragmented network and chrysanthemum-like structures, bringing better toughness than traditional network carbides. Besides, the matrix of high chromium cast iron can be modified via different heat treatments to obtain various microstructures (from fully austenitic to fully martensitic), expanding its application range to fit diverse working conditions.

Our hammer heads for hammer crushers are manufactured with mature high chromium cast iron technology and composite modification treatment for grain refinement and grain boundary purification. Solidification modes are precisely controlled and heat treatment processes are optimized. The finished hammer heads have high hardness, good toughness, strong impact resistance and superior wear resistance, compatible with multiple models of hammer crushers.