NM400 VS NM450：wear-resistant plate
NM400 is a high-strength, Brinell hardness (HBW) wear-resistant steel plate. It is primarily used in applications requiring extremely high wear resistance, such as the mining and construction industries. This steel plate is specially designed to withstand high-intensity wear, making it ideal for applications subject to frequent high-wear and high-impact conditions.
NM450 is a high-strength wear-resistant plate. It is widely used in mining machinery, coal mining machinery, environmental protection machinery, engineering machinery, etc., and is also commonly used as high-strength structural steel with a yield strength of ≥850MPa. Mainly to provide protection in occasions or parts that require wear resistance, so as to extend the life of the equipment, reduce maintenance downtime caused by maintenance, and correspondingly reduce capital investment.
NM450
Chemical Composition Comparison
The performance differences between NM400 and NM450 are fundamentally rooted in their chemical compositions.
| Element | NM400 (wt%) | NM450 (wt%) |
|---|---|---|
| Carbon (C) | ≤0.30 | ≤0.35 |
| Silicon (Si) | ≤0.70 | ≤0.70 |
| Manganese (Mn) | ≤1.60 | ≤1.70 |
| Phosphorus (P) | ≤0.025 | ≤0.025 |
| Sulfur (S) | ≤0.010 | ≤0.010 |
| Chromium (Cr) | ≤1.00 | ≤1.10 |
| Molybdenum (Mo) | ≤0.50 | ≤0.55 |
| Carbon Equivalent (CEV) | ≤0.55 | ≤0.60 |
Comparison of hardness and wear resistance
| Parameter | NM400 | NM450 |
|---|---|---|
| Hardness Range (HBW) | 360–440 | 420–480 |
| Tensile Strength (MPa) | ≥1200 | ≥1250 |
| Yield Strength (MPa) | ≥950 | ≥1050 |
| Elongation (%) | ≥10 | ≥7 |
| Relative Wear Resistance* | Baseline (1.0×) | 1.15–1.3 times that of NM400 |
Impact toughness comparison
| Impact Property | NM400 | NM450 |
|---|---|---|
| -20℃ Impact Energy (typical) | 40–47 J | 35–42 J |
| -40℃ Impact Energy (D/E grade) | ≥21 J | ≥21 J (can reach 50–150 J) |
| Ductility Advantage | Baseline | NM400 provides approximately 40% higher ductility/elongation |
Typical Application Comparison
NM400
As the most common and widely used grade in the NM series, NM400 achieves an optimal balance between wear resistance, toughness, and machinability, making it a standard material in the general heavy machinery industry. Typical applications include:
- Mining equipment: truck bed liners, loader attachments, excavator buckets
- Construction machinery: bulldozer blades, concrete mixer blades, asphalt paver screed plates
- Material handling: chute liners, hopper walls, conveyor bottom plates
- Medium-duty crushers: jaw crusher side guards, cone crusher frame liners
NM450
As a high-performance upgrade to the NM400, the NM450 significantly improves abrasion resistance while maintaining usable impact toughness, and is designed specifically for harsh abrasion environments. Typical applications include:
- Heavy-duty crushing equipment: Impact crusher hammers, hammer crusher feed liners – especially suitable for hard ores such as granite and basalt.
- Mining equipment: Vibrating screens, grabs, heavy-duty excavator buckets, hard rock mining equipment.
- Dump truck bodies: The NM450TUF grade is specifically developed for truck bodies used in extremely cold environments, with a market share exceeding 70% in China.
- Power and cement: Coal processing systems, mill liners, classifier blades.
- High-wear components: Suitable for applications where wear is the primary cause of failure and replacement cycles must be minimized.
Machining and Forming
Machining Difficulty
NM400: Operable with standard equipment and conventional processes, requiring no complex procedures.
NM450: Requires optimized machining parameters and enhanced temperature control during machining.
Cutting
Plasma cutting is the preferred method for both, offering high cost-effectiveness. For flame cutting, NM400 requires preheating to approximately 100°C, and NM450 requires approximately 150°C. Laser cutting and waterjet cutting are available for applications requiring higher precision.
Cold Forming
NM400 can be cold-bent to a suitable minimum bending radius (3t transversely, 4t longitudinally).
NM450 is not suitable for arbitrary cold bending and requires more careful parameter control.
Machining
NM400 can use standard high-speed steel (HSS) tools.
NM450 typically requires carbide or cobalt alloy tools to achieve optimal tool life and machining quality.
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FAQ:
What is NM400 steel?
NM400 Plates is a high-strength, wear-resistant steel known for its superior durability and toughness. NM400 is a Chinese GB standard steel grade. The NM 400 material is widely used in industries where resistance to abrasion (abrasion resistant) is important, such as in the construction and mining sectors.
What is NM450 steel?
NM450 is a type of abrasion-resistant steel plate known for its exceptional hardness and strength. With a Brinell hardness value of around 450 HBW, NM450 abrasion-resistant plates are engineered to withstand severe wear while maintaining structural integrity.
What is NM400 wear plate mainly used for?
NM400 wear plate is commonly used in mining equipment, construction machinery, and material handling systems where stable abrasion resistance and good fabrication performance are required.
Is NM400 wear plate suitable for cutting and welding?
Yes. NM400 wear plate can be cut, welded, and formed using proper procedures, making it suitable for fabricated wear parts such as buckets, liners, and chutes.