Ordinary Wear-Resistant Materials and Their Limitations

Materiali ordinari resistenti all'usura

Ordinary Wear-Resistant Materials and Their Limitations for Anchor Miners

Ordinary wear-resistant materials, acciaio tipicamente bassolegato ad alta resistenza all'usura, spesso non riescono a soddisfare le esigenze degli ancoraggi minatori. Questo tipo di acciaio presenta una microstruttura martensite temperata, fornendo elevata resistenza, buona tenacità, e resistenza all'usura.

Composition and Characteristics

Thickness and Welding Performance: The steel plates used in the loading mechanism are over 20 mm di spessore. The welding performance is assessed using the carbon equivalent (CE), calculated with the formula: $CE=C+Mn6+Si24+Ni15+Cr5+Mo4+Cu13+P2\text{CE} = C + \frac{Mn}{6} + \frac{E}{24} + \frac{In}{15} + \frac{Cr}{5} + \frac{Mo}{4} + \frac{Cu}{13} + \frac{P}{2}$ Using this formula, the carbon equivalent is 0.547%. To enhance wear resistance, wear-resistant welding rods can be used for local surfacing.
Composizione chimica (Mass Fraction %):
- C: 0.24
- E: 0.28
- Mn: 0.78
- P: 0.015
- S: 0.006
- Cu: 0.028
- In: 0.36
- Cr: 0.63
- Mo: 0.028
- V: 0.04
- B: 0.002
Proprietà meccaniche:
- Resistenza alla trazione: 1084 MPa
- Forza di snervamento: ≥800 MPa
- Elongation at Fracture: 14.93%
- Durezza: 360–420 HB

In summary, this material offers high strength, durezza, excellent anti-adhesive wear performance, strong toughness, and good welding and mechanical processing performance. Tuttavia, in practice, its average service life is less than 2 million tons.

Piastra in acciaio composito resistente all'usura

Wear-resistant composite steel plates consist of a wear-resistant composite layer welded onto the surface of ordinary steel plates. The composite layer is metallurgically bonded to the base metal, significantly enhancing surface wear resistance. High-chromium alloy welded wear-resistant composite steel plates are popular due to their superior mechanical properties and cost-effectiveness.