NM450 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.
NM450
Wear-Resistant Plate
NM450 sits between NM400 and NM500 in the GB/T 24186 family: a 450 HBW class plate for severe sliding abrasion that still keeps usable bendability, where NM500 would already demand generous forming radii.
Standards: DIN — (cf. XAR450 class) · AISI AR450 class · GB NM450 (GB/T 24186)
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 | NM450 | NM400 |
|---|---|---|
| C | ≤0.25 | ≤0.25 |
| Si | ≤0.70 | ≤0.70 |
| Mn | ≤1.60 | ≤1.60 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.010 | ≤0.010 |
| Cr | ≤1.50 | ≤1.50 |
| Ni | ≤1.00 | — |
| Mo | ≤0.60 | ≤0.60 |
| B | ≤0.004 | ≤0.004 |
Properties compared
| Property | NM450 | NM400 |
|---|---|---|
| Hardness | 420–480 HBW | 370–430 HBW |
| Tensile strength | ≥1250 MPa (typ.) | ≥1200 MPa (typ.) |
| Impact | ≥24 J at −20 °C (typ. spec) | ≥24 J at −20 °C (typ. spec) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
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: NM450 · NM400. Substitution decisions for certified parts stay with the design authority.