Introduction
NM500 steel (designated under China’s GB/T 24186 standard) has emerged as a premier abrasion-resistant material for extreme-wear environments. With a Brinell hardness of 470–530 HBW and optimized chemistry, it outperforms conventional steels in mining, construction, and heavy machinery sectors.
Key Properties
Superior Hardness-Toughness Balance
Surface hardness: 470–530 HBW (equivalent to 50–55 HRC)
Core toughness: ≥8% elongation to prevent brittle fracture under impact
Tensile strength: ≥1550 MPa
Enhanced Chemistry
Alloy backbone: C (0.30–0.37%), Mn (1.60%), Si (0.70%)
Critical additives: Nickel (0.5–1.0%) for toughness + Molybdenum (0.2–0.4%) for hardenability
Low impurities (P≤0.020%, S≤0.010%) to resist cracking
Microstructural Advantage
Tempered martensite matrix with secondary carbide dispersion
Hardness penetration depth: 30–50 mm after quenching
Industrial Applications
| Sector | Components | Performance Gain |
|---|---|---|
| Mining | Excavator buckets, crusher liners | 4–6× lifespan vs. AR450 steel |
| Construction | Bulldozer blades, rock truck bed liners | 30% reduction in downtime costs |
| Cement | Ball mill separators, conveyor screws | Resists silica abrasion @ 30 m/s |
| Energy | Coal pulverizers, wind turbine shaft collars | Survives 20+ years salt spray |
Advantages Over Alternatives
vs. AR500: Higher toughness (Ni/Mo) + better weldability due to controlled carbon
Fabrication Notes
Welding: Preheat to 150–200°C (302–392°F), use AWS E11018-M electrodes
Machining: Carbide-tipped tools at 80–100 m/min surface speed
Cutting: Waterjet > plasma > laser (oxy-fuel not recommended)
Conclusion
NM500 redefines cost-efficient durability for abrasion-intensive industries. Its GB/T 24186-certified chemistry and microstructure deliver unmatched wear resistance where impact, corrosion, and cyclic loading coexist. While lacking AR500’s ballistic focus, NM500 dominates in earth-moving, mineral processing, and heavy equipment – turning material expenses into long-term ROI.
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
