AR400 vs NM400
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
AR400
Wear-Resistant Plate
AR400 is the North American trade designation for 400-class abrasion-resistant plate — a hardness class (roughly 360–440 HBW), not a single ASTM grade. Chemistry is set by each mill to hit the hardness, so the composition shown is typical published mill chemistry, not a standard-controlled range; always order to guaranteed hardness and check the MTC.
Standards: DIN — (cf. XAR400 class) · AISI AR400 class · GB NM400 (GB/T 24186, comparable class)
NM400
Wear-Resistant Plate
NM400 is China’s 400 HBW class abrasion-resistant plate (GB/T 24186), the workhorse for mining and earthmoving wear parts at a lower price point than European AR brands.
Standards: DIN — (cf. XAR400 class) · AISI AR400 class · GB NM400 (GB/T 24186)
Chemical composition compared (%)
| Element | AR400 | NM400 |
|---|---|---|
| C | ≤0.30 | ≤0.25 |
| Si | ≤0.70 | ≤0.70 |
| Mn | ≤1.60 | ≤1.60 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.015 | ≤0.010 |
| Cr | ≤1.00 | ≤1.50 |
| Mo | ≤0.50 | ≤0.60 |
| B | ≤0.004 | ≤0.004 |
Properties compared
| Property | AR400 | NM400 |
|---|---|---|
| Hardness | 360–440 HBW | 370–430 HBW |
| Tensile strength | ≥1200 MPa (typ.) | ≥1200 MPa (typ.) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Impact | — | ≥24 J at −20 °C (typ. spec) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: AR400 · NM400. Substitution decisions for certified parts stay with the design authority.