Ar Wear Plate
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AR series and Chinese NM series are functionally equivalent in terms of hardness, wear resistance, and industrial applications.
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NM series provides a cost-effective alternative for industrial users while maintaining comparable chemical composition and mechanical properties.
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Selecting the right grade depends on application requirements, thickness, and availability, but either series can meet high-abrasion industrial needs.
- Description
AR (Abrasion Resistant) wear plates are high-hardness steels designed to withstand extreme wear and impact.
In China, the equivalent series is the NM (耐磨) series, which includes NM400, NM450, NM500, NM550, and NM600.
While both series serve similar purposes, there are differences in chemical composition, hardness, and mechanical performance.
1. Chemical Composition Comparison
| Grade | C (%) | Mn (%) | Cr (%) | Mo (%) | Others |
|---|---|---|---|---|---|
| AR400 | 0.2–0.25 | 1.2–1.5 | 0.8–1.2 | 0.2–0.3 | Ni ~0.3 |
| AR450 | 0.25–0.3 | 1.4–1.7 | 0.8–1.3 | 0.2–0.3 | Ni ~0.3 |
| AR500 | 0.3–0.4 | 1.4–1.8 | 0.9–1.5 | 0.2–0.4 | Ni ~0.3 |
| NM400 | 0.18–0.22 | 1.2–1.5 | 0.8–1.1 | 0.15–0.25 | — |
| NM450 | 0.22–0.26 | 1.3–1.6 | 0.8–1.2 | 0.2–0.3 | — |
| NM500 | 0.25–0.32 | 1.4–1.7 | 0.9–1.3 | 0.2–0.35 | — |
Observations:
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Both AR and NM series contain carbon, manganese, and chromium as key alloying elements.
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AR series may include nickel and slightly higher alloy contents for imported quality control.
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Chinese NM series is produced to GB/T 24186 standards, ensuring comparable hardness and wear resistance.
2. Mechanical Performance Comparison
| Grade | Hardness (HB) | Tensile Strength (MPa) | Yield Strength (MPa) | Impact Toughness (J) |
|---|---|---|---|---|
| AR400 | 400 ± 20 | 850–950 | 550–700 | 25–35 |
| AR450 | 445–475 | 900–1000 | 600–750 | 25–40 |
| AR500 | 500 ± 20 | 950–1100 | 650–800 | 20–35 |
| NM400 | 400 ± 20 | 850–950 | 550–700 | 25–35 |
| NM450 | 440–460 | 900–1000 | 600–750 | 25–40 |
| NM500 | 480–520 | 950–1100 | 650–800 | 20–35 |
Key Takeaways:
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Hardness and tensile properties are very similar between AR and NM grades.
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Both series are suitable for heavy wear applications.
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Slight differences may exist due to raw material sources and heat treatment processes.
3. Applications
| Industry | AR Series | NM Series |
|---|---|---|
| Mining | Crusher liners, bucket liners, hoppers | Same applications |
| Cement & Construction | Mixer blades, feed chutes, conveyors | Same applications |
| Metallurgy | Furnace hoppers, chutes, liners | Same applications |
| Heavy Equipment | Excavator buckets, dump truck beds | Same applications |
