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Abrasion Resistant Steel Grades
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Abrasion resistant steel grades are designed to resist surface wear caused by abrasion, impact, and sliding friction in heavy industrial environments. These grades are mainly classified by hardness level (HBW) and are widely used in mining, construction, cement, steel plants, and bulk material handling systems.
Different grading systems exist globally, including NM series (China) and AR series (international standard equivalent), along with some high-hardness extended grades.
1. NM Series Wear Resistant Steel Grades (China Standard)
| Grade | Hardness (HBW) | Performance Level | Typical Applications |
|---|---|---|---|
| NM360 | 330–390 | Basic wear resistance | Light machinery, general structural wear parts |
| NM400 | 380–460 | Standard industrial grade | Excavators, dump trucks, cement liners |
| NM450 | 430–500 | High wear resistance | Heavy mining equipment, high-impact areas |
| NM500 | 470–550 | Very high wear resistance | Crushers, ore handling, severe abrasion systems |
| NM550 | 520–600 | Extreme wear resistance | Mining crushers, high-abrasion zones |
| NM600 | 570–650 | Maximum hardness level | Extreme industrial wear environments |
2. AR Series Wear Resistant Steel Grades (International System)
| Grade | Hardness (HBW) | Performance Level | Typical Applications |
|---|---|---|---|
| AR400 | ~360–440 | Medium wear resistance | Construction machinery, mining equipment |
| AR450 | ~430–480 | High wear resistance | Heavy-duty liners, industrial equipment |
| AR500 | ~470–540 | Very high wear resistance | Mining, crushers, bulk material systems |
| AR550 | ~520–600 | Ultra high hardness | Severe abrasion environments |
| AR600 | ~570–650 | Extreme wear resistance | Special high-impact industrial systems |
3. Other Common Wear Resistant Steel Types
Hardfaced (Overlay) Wear Plates
- Base steel + chromium carbide coating
- Extremely high surface hardness (up to 600–700 HB equivalent)
- Used in extreme wear environments such as cement and mining systems
Bimetal Wear Plates
- Combination of mild steel base + wear resistant alloy layer
- High cost-performance ratio
- Used in hoppers, chutes, and conveyor systems
4. Wear Resistant Steel Grade Classification Logic
Wear resistant steel grades are mainly defined by:
- Hardness level (HBW)
- Alloy composition (carbon, chromium, manganese, boron)
- Heat treatment process (quenching and tempering)
- Application severity (light, medium, heavy, extreme wear)
5. Performance Trend Across Grades
- Higher grade = higher hardness = better wear resistance
- Higher hardness = slightly reduced toughness and formability
- Lower grade = better weldability and impact resistance
- Selection depends on working environment, not only hardness
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