What Are NM450 and NM450Tuf?
What is NM450 Steel?
NM450 steel is one kind of Chinese wear/abrasion resistant steel plates. It was hot rolled and then the plates were heat-treated by direct quenching and tempering and reheat quenching and tempering techniques, respectively. With high mechanical strength, NM450 is 3 times to 5 times more than common low-alloy steel plates which can significantly improve surface hardness, usually achieved 360 ~ 450HB.
What is NM450Tuf Steel?
NM450 Tuf is the newly upgraded wear-resistant steel grade of LY Steel (Hunan Valin Lianyuan Iron & Steel Co., Ltd.). It features a tensile strength of 1420–1500 MPa and Brinell hardness ranging from 435 to 465 HBW, with outstanding abrasion resistance, dent resistance, weldability and cold formability.
By optimizing trace alloy element composition and upgrading rolling processes, LY Steel's NM450Tuf plate significantly boosts impact toughness, reduces cracking risk and inhibits crack propagation.
NM450 vs NM450Tuf：Chemical Composition Comparison
NM450Tuf Chemical Composition Comparison：
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | B |
|---|---|---|---|---|---|---|---|---|---|
| Typical Value | ≤0.22 | ≤0.70 | 1.00–1.60 | ≤0.020 | ≤0.010 | 0.30–1.20 | 0.20–1.00 | 0.20–0.60 | 0.001–0.005 |
NM450 Chemical Composition Comparison：
| NM450 Chemical Compositiom | |||||||||||
| Plate | C | Si | Mn | P | S | Cr | Ni | Mo | B | CEV | CET |
| thickness mm | max % | max % | max % | max % | max % | max % | max % | max % | max % | typv | typv |
| 3-(8) | 0.19 | 0.7 | 1.6 | 0.025 | 0.01 | 0.25 | 0.25 | 0.25 | 0.004 | 0.41 | 0.30 |
| 8-20 | 0.21 | 0.7 | 1.6 | 0.025 | 0.01 | 0.50 | 0.25 | 0.25 | 0.004 | 0.47 | 0.34 |
| (20)-40 | 0.23 | 0.7 | 1.6 | 0.025 | 0.01 | 1.00 | 0.25 | 0.25 | 0.004 | 0.57 | 0.37 |
| (40)-50 | 0.23 | 0.7 | 1.6 | 0.025 | 0.01 | 1.40 | 0.25 | 0.60 | 0.004 | 0.59 | 0.36 |
| (50)-80 | 0.26 | 0.7 | 1.6 | 0.025 | 0.01 | 1.40 | 1.00 | 0.60 | 0.004 | 0.72 | 0.41 |
NM450 vs NM450Tuf：Mechanical Properties Comparison
| Property | NM450 | NM450Tuf | Quantitative Comparison |
|---|---|---|---|
| Hardness (HBW) | 420–480 | 420–480 | Same hardness range |
| Yield Strength (MPa) | ≥950 | ≥1100 | ~16% higher |
| Tensile Strength (MPa) | 1200–1600 | 1350–1650 | Lower limit +12.5%, upper limit +3% |
| Elongation (%) | ≥10 | ≥12 | 20% higher |
| Impact Toughness (Charpy V‑notch, -20°C) (J) | ≥24 | ≥100 | ~317% higher |
| Surface Hardness Retention (hardness loss after 1000 impact wear cycles, %) |
≤15% | ≤8% | Hardness loss reduced by ~47% |
| Fracture Toughness (K<sub>IC</sub>, MPa√m) (typical values) |
~40 | ~60 | 50% higher |
| Wear Resistance (pin‑on‑disc test, mass loss mg/h) |
~0.12 | ~0.10 | Wear rate reduced by ~17% |
| Cold Formability (minimum bending radius, t = plate thickness) |
3t (no cracks) | 2t (no cracks) | Tighter bend radius achievable |
| Weldability (Carbon Equivalent CEV, %) |
≤0.48 | ≤0.44 | Lower CEV, reduced cold‑cracking tendency |
Not Sure Which Grade Fits Your Application?
Choosing the right wear plate depends on much more than hardness. Abrasive material, impact level, plate thickness, welding requirements, and expected service life all affect the final selection.
Contact us now for the latest pricing on NM450 and NM450Tuf.
Tell us your application, and our engineers will recommend the most suitable wear-resistant steel grade based on your working conditions.
NM450 vs NM450Tuf：Hardness and Wear Resistance
Both NM450 and NM450Tuf are designed with a nominal hardness of 450 HBW, providing excellent resistance to abrasive wear in demanding industrial applications. Since wear resistance is primarily influenced by hardness, the two grades offer comparable performance under pure sliding abrasion.
The key difference lies in their behavior under combined abrasion and impact loading. NM450Tuf is engineered with significantly higher toughness and crack resistance, allowing it to better withstand repeated impacts without surface cracking or edge chipping. As a result, it can maintain its wear resistance for a longer period in severe operating conditions where both abrasion and impact occur simultaneously.
For applications dominated by sliding wear, standard NM450 remains a cost-effective choice. However, for heavy-duty mining equipment, excavator buckets, crusher liners, and other components exposed to continuous impact, NM450Tuf generally delivers a longer service life and lower maintenance frequency.
Why NM450Tuf Often Lasts Longer?
Although both grades have approximately the same hardness, hardness is only one factor affecting wear life. In applications involving repeated impact, fatigue, and abrasive particles, premature failure often occurs because of surface cracking, edge chipping, or fracture, rather than simple material loss.
NM450Tuf minimizes these failure modes through improved toughness and crack resistance. This allows the wear surface to remain intact for longer, resulting in a longer effective service life and reduced maintenance downtime.
NM450 vs NM450Tuf：Welding and Fabrication
Both NM450 and NM450Tuf can be welded, cut, drilled, and formed using conventional fabrication methods. However, NM450Tuf is specifically engineered to provide improved toughness and ductility, making it easier to fabricate while maintaining the same nominal hardness of 450 HBW.
Compared with standard NM450, NM450Tuf generally offers better resistance to cracking during welding and forming. Its enhanced toughness also allows tighter bending radii and improved cold-forming performance, making it suitable for manufacturing complex wear components such as excavator buckets, dump truck bodies, crusher liners, and heavy-duty chutes.
| Fabrication Process | NM450 | NM450Tuf |
|---|---|---|
| Flame Cutting | ✓ | ✓ |
| Plasma Cutting | ✓ | ✓ |
| Laser Cutting | ✓ | ✓ |
| Waterjet Cutting | ✓ | ✓ |
| Drilling | ✓ | ✓ |
| CNC Machining | ✓ | ✓ |
| Cold Bending | ✓ | ✓✓ |
| Welding | ✓ | ✓✓ |
Available processing methods
Flame cutting
Plasma cutting
Laser cutting
Drilling
Cold bending
Welding
NM450 vs NM450Tuf：Cost and Performance
| Item | NM450 | NM450Tuf |
|---|---|---|
| Initial Cost | Lower | Higher |
| Service Life | Standard | Longer |
| Downtime | More | Less |
| Total Ownership Cost | Medium | Lower |
NM450 vs NM450Tuf：How to choose?
1. Choose standard NM450 (regular grade)
Pick conventional NM450 if all below apply:
- Working environment has low to moderate impact loads; no frequent heavy striking, sharp rock collision or large scrap metal impact.
- Operating temperature stays above -10°C, no long-term exposure to frigid sub-zero weather.
- Parts only require basic wear resistance; low risk of cracking during cold bending, welding or field service.
- Cost control is a priority, and you do not need ultra-high low-temperature toughness.
- Typical applications: general cement clinker chutes, light-duty liner plates, low-impact conveyor liners, simple hoppers with minor abrasion.
2. Choose NM450Tuf (high-toughness upgraded grade)
Select NM450Tuf when any of these conditions exist:
- Heavy impact service: mines, quarries, demolition sites, scrap steel recycling, loader buckets, heavy truck cargo bodies that bear repeated violent strikes.
- Long-term service under -20°C cold conditions, such as open-pit mines in cold northern regions.
- Strict anti-cracking demand: frequent cold forming, complex bending, large-area on-site welding, thin-plate wear components prone to weld cracks.
- Longer service life expectation: need service life 85%–100% longer than standard NM450 to cut maintenance downtime and replacement frequency.
- Components face sharp hard materials: sharp rock, reinforced concrete blocks, jagged heavy scrap steel.
- Typical applications: heavy loader buckets, mine haul truck liners, demolition equipment wear parts, cold-region mining liners, thick-walled heavy-duty containers.
Why Choose GNEE GROUP?
GNEE GROUP is a professional supplier of wear-resistant steel plates with extensive export experience in global markets. We offer stable quality, flexible custom processing, fast delivery, and complete technical documentation.Our experienced team provides reliable material recommendations and responsive support to help customers reduce procurement costs and improve project efficiency.
All wear-resistant steel plates can be supplied with:
✓ EN 10204 3.1 MTC
✓ Third-party inspection
✓ Ultrasonic testing (UT)
✓ Customized dimensions
✓ Export seaworthy packing
Contact us for complete technical documentation before ordering.
Contact us now for the latest pricing on NM450 and NM450Tuf.
FAQ:
1.What is NM450 equivalent to?
NM450 is equivalent to international grades such as Hardox 450 (Sweden, SSAB), AR450 (ASTM standards), JFE-EH450 (Japan), and Dillidur 450V (Germany).
2.What is the difference between Hardox 450 and NM450?
NM450: NM450 is a wear-resistant steel grade produced by a variety of manufacturers. It does not have a specific brand name associated with it. Hardox 450: Hardox 450 is a brand of abrasion-resistant steel manufactured by SSAB, a Swedish steel company. Hardox is a well-known and widely used brand in the industry.
3.Why does NM450 steel have high wear resistance?
- Principle: Through quenching and tempering heat treatment, a martensitic + bainitic composite structure is formed, with dispersed carbides (Cr₂₃C₆, Mo₂C) distributed on the NM450 steel matrix.
- Performance: NM450 is 2.5-3 times more wear-resistant than Q345 ordinary steel plate and 15-20% more wear-resistant than NM400. Its service life is increased by 3-5 times under ore friction and material impact scenarios.
4.Can NM450 steel be welded?
Although NM450 is a high-hardness steel, reliable welding can be achieved through proper processes. The key is "temperature control + low hydrogen".
5.Why does NM450 steel crack after cold working?
Due to the high hardness of NM450 steel, if the cold bending radius is too small or the stamping deformation is too large after cold working, the internal stress will be high, which can easily lead to cracking.
Solution: Increase the bending radius (≥3 times the plate thickness), and perform stress-relieving tempering at 150-200℃ immediately after cold working.
