Comparative Analysis: AR500 vs. NM500 Steel Plates
1. Standards & Origin
AR500:
Generic term for abrasion-resistant steel with ~500 HB hardness.
Primarily follows ASTM/AISI standards (e.g., ASTM A514) or military specs (MIL-DTL-46177).
Commonly produced in North America.
NM500:
Standardized grade under China's GB/T 24186-2009.
"NM" denotes Nai Mo (wear-resistant).
2. Chemical Composition
| Element | AR500 Range | NM500 Requirement (GB/T) |
|---|---|---|
| Carbon (C) | 0.30–0.50% | 0.20–0.30% Max |
| Manganese (Mn) | 0.60–1.50% | ≤1.60% |
| Silicon (Si) | 0.15–0.65% | ≤0.70% |
| Key Difference: AR500 permits higher carbon content for hardness; NM500 prioritizes weldability with stricter carbon control. | ||
3. Mechanical Properties
| Property | AR500 | NM500 (GB/T 24186) |
|---|---|---|
| Hardness | 477–534 HBW (Typical) | 470–530 HBW |
| Tensile Strength | ≥1,600 MPa | ≥1,550 MPa |
| Impact Toughness | -40°C: ≥20 J (Military) | Ambient: ≥24 J |
|
Notable Gap: AR500 emphasizes ultra-low-temperature impact resistance (military use); NM500 focuses on room-temperature toughness.
For technical specifications, always reference the governing standards: AR500: ASTM A514 / MIL-DTL-46177 NM500: GB/T 24186-2009 |
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