Hardox 400 vs NM400 difference in composition & properties.
Chromium: Hardox 400 ≤2.5% against NM400 ≤1.2%.
Key differences between Hardox 400 and NM400
- Chromium: Hardox 400 ≤2.5% against NM400 ≤1.2%.
Hardox 400 vs NM400 chemical composition (weight %)
| Element | Hardox 400 | NM400 |
|---|---|---|
| C | ≤0.32 | ≤0.3 |
| Si | ≤0.7 | ≤0.7 |
| Mn | ≤1.6 | ≤1.6 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.01 | ≤0.01 |
| Cr | ≤2.5 | ≤1.2 |
| Ni | ≤1.5 | ≤0.7 |
| Mo | ≤0.6 | ≤0.5 |
| B | ≤0.004 | 0.001–0.006 |
| Ti | – | ≤0.05 |
| Al | – | ≥0.01 |
Mechanical properties, equivalents and uses
| Property | Hardox 400 | NM400 |
|---|---|---|
| Family | Abrasion-resistant steel plate | Abrasion-resistant steel plate |
| Tensile strength, MPa | – | ≥1200 |
| Yield strength, MPa | – | – |
| Elongation, % | – | ≥10 |
| Hardness | 370–430 HBW | 370–430 HBW |
| Density, g/cm³ | 7.85 | 7.85 |
| EN | Hardox® 400 (SSAB brand; no EN number) | Hardox 400 (SSAB, nearest) |
| JIS | JFE-EH400 / ABREX 400 (nearest) | – |
| IS (India) | IS 18809 ISAR 400 (nearest) · AM/NS Rockstar 400 · JSPL Rockhard 400 | IS 18809 ISAR 400 (nearest) · AM/NS Rockstar 400 · JSPL Rockhard 400 |
| AISI / ASTM | AR400 (nearest) | AR400 (nearest) |
| Typical uses | Mostly used for dumper and tipper bodies, buckets, chutes, hoppers, liners, crusher and conveyor wear parts | Mostly used for tipper bodies, buckets, liners and chutes |
Mechanical values: Hardox 400 plate 4–130 mm (sheet 2–8 mm); quenched / NM400 plate t ≤80 mm (surface; core 330–430). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between Hardox 400 and NM400?
Chromium: Hardox 400 ≤2.5% against NM400 ≤1.2%.
Where are Hardox 400 and NM400 used?
Hardox 400: Mostly used for dumper and tipper bodies, buckets, chutes, hoppers, liners, crusher and conveyor wear parts. NM400: Mostly used for tipper bodies, buckets, liners and chutes.
Can NM400 replace Hardox 400?
Only if the purchase specification allows it. Check the governing standard, chemistry limits and mechanical properties against the order, and confirm on the mill test certificate.
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Mill test certificate (EN 10204 3.1) supplied with material; third-party inspection on request.
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.