NM400
Data under reviewNM400 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.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.25 |
| Si | ≤0.70 |
| Mn | ≤1.60 |
| P | ≤0.025 |
| S | ≤0.010 |
| Cr | ≤1.50 |
| Mo | ≤0.60 |
| B | ≤0.004 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness | 370–430 HBW |
| Tensile strength | ≥1200 MPa (typ.) |
| Impact | ≥24 J at −20 °C (typ. spec) |
| Density | 7.85 g/cm³ |
Heat treatment
Delivered quenched or quench-tempered — do NOT re-heat above ~250 °C in service or processing.
Equivalent grades
| Standard | Designation |
|---|---|
| din | — (cf. XAR400 class) |
| aisi | AR400 class |
| gb | NM400 (GB/T 24186) |
Compare side by side: NM400 vs NM500
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Excavator buckets, dump truck bodies, crusher liners, chutes, bulldozer blades.
Processing: Cut by plasma/laser/waterjet; bend with generous radii (≥3× thickness); weld with low-hydrogen consumables and controlled heat input.
FAQ
- NM400 vs Hardox 400?
- Same hardness class and similar chemistry philosophy; NM400 is the Chinese national-standard grade (GB/T 24186) at a lower mill price. Compare guaranteed hardness and impact values on the MTC.
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Ask for a quotationVisit NasteelSource: GB/T 24186 published ranges (mill-dependent) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.