NM450 Wear Plate: the 450 HBW Middle-Weight
NM450 is the middle grade of Baosteel's NM wear-resistant program: a 450 HBW-class quenched-and-tempered plate that adds about 50 HBW of abrasion resistance over NM400 while keeping the toughness, bendability and weldability the class is known for. If your NM400 lining is wearing out faster than your maintenance schedule, NM450 is usually the next step up. Buyers searching for AR450 steel plate or a Hardox 450 equivalent are looking for exactly this 450 HBW class. Baohui Steel supplies NM450 as an annual-agreement partner of Baosteel, with the original mill test certificate for every shipment.
International equivalents
| Mill / standard | Designation |
|---|---|
| Baosteel · GB/T 24186 | NM450 |
| SSAB (Sweden) | Hardox 450 |
| thyssenkrupp (Germany) | XAR 450 |
| JFE (Japan) | JFE-EH450 |
| Dillinger (Germany) | Dillidur 450V |
| Ruukki (Finland) | Raex 450 |
| Generic (North America) | AR450 |
Real mill certificate data (delivered to Baohui)
Guaranteed values are one thing — delivered steel is another. This is inspection certificate No. BGSAI2402270700100, issued by Baosteel's Baoshan core base on 27 February 2024 for a 10.00 × 1800 × 12000 mm NM450 plate consigned to Baohui Steel:
| Property | Certificate result | Reading |
|---|---|---|
| Brinell hardness | 449 / 451 / 457 HBW, average 452 | Dead centre of the 420–480 class |
| Yield strength ReH | 1,250 MPa | Matches the Hardox 450 typical value — as a measured result |
| Tensile strength Rm | 1,464 MPa | High strength reserve for structural wear parts |
| Elongation A | 17 % | Excellent ductility for a 450 HBW plate |
| Charpy V KV2, −20 °C | 57 / 50 / 49 J, average 52 J | Toughness most buyers do not expect at this hardness |
| Bend test | 90°, d = 6a (60 mm mandrel on 10 mm), OK | Forms cold without cracking |
| Ladle analysis | C 0.21 %, S 0.002 %, micro-alloyed Nb-Ti-B | Low-carbon clean steel — weld-friendly for its hardness |
One heat, one certificate — 452 HBW dead centre of the class, 52 J at −20 °C, and a chemistry (0.21 % C, 0.002 % S) that keeps the grade workshop-friendly. Learn to read these fields yourself in our line-by-line MTC guide.
Measured vs GB/T 24186 guaranteed values
| Property | Measured — certificate BGSAI2402270700100 | GB/T 24186 guaranteed (reference) |
|---|---|---|
| Brinell hardness | 452 HBW average | 420–480 HBW (450 ± 30 class) |
| Yield strength ReH | 1,250 MPa | ≥ 1,250 MPa |
| Elongation A | 17 % | ≥ 7 % |
| Impact KV2 | 52 J at −20 °C | ≥ 17 J at −20 °C (contract option; NM450E option: −40 °C) |
NM450 vs Hardox 450 vs XAR 450: the 450 HBW class compared
| Grade | Mill | Hardness (HBW) | Positioning |
|---|---|---|---|
| NM450 | Baosteel (GB/T 24186) | 420–480; delivered avg 452 | Best price-performance in the 450 class; FOB Shanghai 760–830 USD/MT |
| Hardox 450 | SSAB (Sweden) | 425–475 (plate ≤ 80 mm) | Reference brand; distributor network at a significant premium |
| XAR 450 | thyssenkrupp (Germany) | ~420–480 class | European mill alternative; project-specification driven |
| Raex 450 | Ruukki / SSAB Finland | ~450 class | Nordic mill alternative |
The full head-to-head with pricing: NM450 vs Hardox 450 — specs, price and real mill certificate data.
NM450E: the −40 °C cold-climate option
Need 450 HBW with guaranteed impact at −40 °C? That is NM450E — identical hardness class with a guaranteed KV2 ≥ 20 J at −40 °C, built for freezing climates from Russia and Central Asia to Northern Europe and Canada. Full E-series data (NM400E/NM450E/NM500E): −40 °C E-series wear plate.
Real stock dimension table (updated weekly)
We publish our actual stock because a stockholder can and a broker cannot. Current NM450 stock: 2,757.0 MT across 20 thicknesses from 2 to 40 mm (updated 2026-11-13; the weekly list lives on our wear plate price page).
| Thickness (mm) | Stock (MT) | Width × length (mm) |
|---|---|---|
| 2.0 mm | 18.0 MT | 1,250 × 6,000 |
| 3.0 mm | 102.2 MT | 1,500 × 6,000 |
| 4.0 mm | 149.6 MT | 1,500–1,800 × 6,000–12,000 |
| 4.2 mm | 8.2 MT | 1,500–1,600 × 6,400–7,680 |
| 5.0 mm | 180.6 MT | 1,500–2,000 × 4,000–12,000 |
| 6.0 mm | 454.2 MT | 1,500–2,080 × 6,000–12,000 |
| 7.0 mm | 58.8 MT | 1,600–2,080 × 6,000–7,000 |
| 8.0 mm | 432.2 MT | 1,500–2,500 × 5,800–12,000 |
| 10.0 mm | 302.8 MT | 1,500–2,000 × 6,000–12,000 |
| 12.0 mm | 229.8 MT | 1,500–2,000 × 2,000–12,000 |
| 14.0 mm | 81.8 MT | 2,000 × 12,000 |
| 15.0 mm | 33.9 MT | 2,000 × 12,000 |
| 16.0 mm | 197.2 MT | 2,000–2,200 × 5,800–12,000 |
| 18.0 mm | 13.6 MT | 2,000 × 12,000 |
| 20.0 mm | 140.7 MT | 2,000 × 8,000–12,000 |
| 22.0 mm | 13.7 MT | 2,200 × 12,000 |
| 25.0 mm | 88.8 MT | 2,000–2,500 × 6,000–12,000 |
| 30.0 mm | 92.4 MT | 2,000–2,200 × 6,000–12,000 |
| 35.0 mm | 39.6 MT | 2,000 × 12,000 |
| 40.0 mm | 119.0 MT | 1,850–2,200 × 5,700–12,000 |
Baosteel's thin-gauge program extends below this list — down to the 1.5 mm class — for lightweight wear parts; ask for current availability.
Applications by industry
Mining and quarrying. Crusher liners, chutes, hopper and bucket liners — where NM400 wears through too fast but NM500 would be too brittle to form.
Construction and earthmoving. Cutting edges, end bits, bulldozer blades, wear strips in high-abrasion duty.
Cement, concrete and aggregates. Mixer liners, screw conveyor flights, screen and wear components.
Agriculture and recycling. Shredder and grab wear parts, trommel screens, trailer bodies in abrasive service.
Fabrication and welding notes
NM450 still bends and welds well — the certificate above shows 90° on a 60 mm mandrel — but it is a quenched-and-tempered 450 HBW steel: use low-hydrogen consumables, respect preheat for thicker sections, and keep cutting heat input low. Baosteel's official welding procedure — preheat temperatures, filler selection and real joint data — is summarized in our Baosteel welding guide. In-house we cut to size on 60 kW fiber lasers and offer shot blasting plus primer coating (Sa 2.5, 15–50 μm) before export packing.
Sizes, stock and supply
Thickness 2.0–40 mm in standing stock (table above), widths to 2,500 mm, lengths to 12,000 mm; thin gauges to 1.5 mm via Baosteel's thin-gauge program, heavier gauges on request. Indicative FOB Shanghai: 760–830 USD/MT depending on thickness and volume — every shipment with the original Baosteel mill test certificate and ISO 14025-verified EPD. Typical HS code: 722540. SGS / BV third-party inspection available before loading. Request the current stock list and a firm quote.
FAQ
Is NM450 the same as Hardox 450 or AR450? Same hardness class and comparable properties — different mill and standard. Treat NM450 as the Hardox 450 / AR450 equivalent and verify each heat with the original mill test certificate we ship with every order.
Can NM450 be welded and bent? Yes — the certificate shows 90° at d = 6a. Use low-hydrogen consumables, control heat input, and follow preheat guidance for thicker sections; see our welding guide.
NM400, NM450 or NM500 — which one do I need? By wear mode: moderate sliding abrasion plus forming → NM400; the 50 HBW step up that typically doubles lining life → NM450; severe sliding abrasion, forming less critical → NM500.
What sizes can you ship? Standing stock covers 2.0–40 mm (table above), cut-to-size on 60 kW fiber lasers, from single trial plates to full container loads.
Which certificate do I get? The original Baosteel mill test certificate with heat number traceability, plus ISO 14025-verified EPD; EN 10204 3.1-equivalent documentation and third-party inspection (SGS / BV) on request.
Further reading
- NM400/NM450/NM500 wear plate hub (AR400 / Hardox 400/450/500 class)
- NM400 — the 400 HBW all-rounder · NM500 — the 500 HBW heavy-duty class
- NM550 wear plate (Hardox 550 class) · NM600/AR600 wear plate (Hardox 600 class) · E-series −40 °C wear plate
- NM450 vs Hardox 450: specs, price and real mill certificate data
- Baosteel welding guide: preheat, filler metal and real joint data · China's wear-resistant steel mills, ranked
