Piastra di usura 400
Piastra di usura 400 (AR400 / NM400) provides an ideal balance of hardness, tenacità, and fabrication performance.
It is internationally recognized with equivalents such as Hardox 400 (EU), XAR 400 (Germania), e AR400 (USA), making it a reliable choice for minerario, costruzione, cemento, e industrie di movimentazione dei materiali.
- Descrizione
Piastra di usura 400 si riferisce a abrasion resistant steel with a Brinell hardness of approximately 400 HBW.
It is widely used in minerario, costruzione, cemento, e industrie di movimentazione dei materiali, offerta Eccellente resistenza all'usura pur mantenendo good toughness and fabrication performance.
The exact chemical composition and grade designation vary between countries, but all share similar hardness and mechanical properties.
Common International Grades Equivalent to AR400 / NM400
| Region / Standard | Grade Equivalent | Durezza (HBW) | Forza di snervamento (MPa) | Resistenza alla trazione (MPa) | Resistenza all'impatto (J, -40°C) |
|---|---|---|---|---|---|
| USA / ASTM | AR400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
| Europa / IN | Hardox 400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
| Germania / DA | XAR 400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
| Cina / GB | NM400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
| Giappone / LUI | NM400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
| Australia / AS | AR400 | 360–440 | 1000–1250 | 1200–1400 | ≥27 |
Nota: Durezza, forza, and impact values are approximate averages; exact values depend on plate thickness and manufacturer heat treatment.
Proprietà meccaniche
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Durezza: 360–440 HBW ensures elevata resistenza all'usura for sliding and light impact abrasion.
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Forza di snervamento: 1000–1250 MPa allows the plate to withstand heavy loads without permanent deformation.
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Resistenza alla trazione: 1200–1400 MPa ensures the plate can resist stretching under stress.
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Resistenza all'impatto: ≥27 J at -40°C provides sufficient resistance to cracking during moderate impact.
Applicazioni tipiche
| Application Area | Esempi | Reason for Use |
|---|---|---|
| Estrazione | Truck liners, tramogge, feeder plates | Resistant to sliding abrasion from ore and rock |
| Costruzione | Benne per escavatori, lame del bulldozer | Balances wear resistance and formability |
| Cemento & Concrete | Mixers, cade, trasportatori | Protects against sand and gravel wear |
| Gestione del materiale | Conveyor plates, cade | Extends service life under abrasive materials |
| Light Impact Areas | Storage bins, fodere | Sufficient toughness for moderate impact |
Key Selection Notes
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AR400 / NM400 is a versatile grade suitable for medium abrasion + moderate impact conditions.
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Per una maggiore resistenza all'usura, choose AR450 or AR500, but fabrication becomes more challenging.
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For impact-heavy applications, considerare Mn13 (acciaio ad alto contenuto di manganese), che indurisce il lavoro sotto impatti ripetuti.
