NM400 steel is a high-strength wear-resistant steel under the Chinese GB/T 24186 standard. Known for its excellent hardness, durability, and toughness, NM400 material is widely used in industries where abrasion and impact resistance are essential, especially in mining, construction, cement production, and heavy equipment manufacturing.
This abrasion-resistant grade is typically supplied in quenched and tempered (Q+T) condition, offering stable performance and long service life in harsh working environments.
1. What Is NM400 Steel?
NM400 steel plate is a wear-resistant steel with a nominal hardness of 400 HBW. It combines high hardness with good toughness, making it ideal for components subjected to high levels of abrasion and impact.
Key features include:
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High impact resistance – withstands material dropping or striking during conveying.
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Good heat resistance – performs well below 600°C; with added alloying elements (V, Mo), it can work stably below 800°C.
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Corrosion resistance – contains Cr, enhancing corrosion resistance in various environments.
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Cost-effectiveness – although priced 3–4 times higher than normal steel, its service life is 10+ times longer.
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Excellent processability – strong weldability and bendability allow easy fabrication into various shapes.
2. Supply Range of NM400 Steel Plate & Sheet
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Thickness: 3–120 mm
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Width: 1500–2300 mm
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Length: customizable
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Surface: Black surface
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Condition: QT (quenched & tempered, pre-hardened)
3. NM400 Steel Specifications & Equivalent Grades
| Standard | Grade |
|---|---|
| GB/T 24186 | NM400 |
| JFE | JFE-EH400 |
| SUMITOMO | K400 |
| DILLIDUR | 400V |
| SSAB | Hardox 400 |
These grades are commonly used interchangeably depending on regional standards and availability.
4. NM400 Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo | Ti | B | Als |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NM400 | ≤0.30 | ≤0.70 | ≤1.60 | ≤0.025 | ≤0.010 | ≤1.20 | ≤0.70 | ≤0.50 | ≤0.50 | 0.0005–0.006 | ≥0.01 |
5. NM400 Mechanical Properties
Strength Properties
| Grade | Yield Strength (Min MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| NM400 | 1000 | 1200 | ≥10 |
Hardness
| Thickness | Hardness (HBW) |
|---|---|
| ≤80 mm | 370–430 |
| >80–120 mm | 360–440 |
These properties ensure superior resistance to wear, impact, and deformation.
6. Forging of NM400 Steel
Forging requires heating the material to the correct temperature before forming. Proper forging improves toughness and enhances mechanical properties. However, because NM400 is usually supplied in Q+T condition, excessive heating may affect hardness and should be controlled.
7. Heat Treatment of NM400 Wear-Resistant Steel
Typical heat treatment includes:
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Annealing
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Normalizing
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Quenching
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Tempering
Commercially supplied NM400 plates are generally delivered in Q+T (quenched & tempered) condition to ensure stable hardness and abrasion resistance.
8. Applications of NM400 Wear Plate
NM400 is designed for areas requiring high wear and impact resistance. Typical applications include:
Wear Parts for Heavy Machinery
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Cement machinery components (powder separator wear parts)
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Mixer blades
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Mill liners and rollers
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Fan blades
Wear-Resistant Pipelines
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Powder conveying pipes
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Blast furnace slag handling systems
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Propeller blades
Mining & Construction Components
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Buckets and large loader attachments
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Chutes, hoppers, silos
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Dredger bucket liners
Fabrication & On-site Welding
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Customized wear plates for equipment repair
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Structural protection plates
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Chute liners and impact plates
NM400 steel is widely chosen for its long service life, reduced maintenance, and durability in demanding environments.
FAQs
1. Is NM400 suitable for heavy machinery construction?
Yes. Its high strength and wear resistance make it ideal for mining, construction, and material-handling machinery.
2. Do you supply 8mm NM400 plates?
Yes. NM400 plates are available from 3mm to 120mm.
3. Are you a factory supplier of NM400 steel plate?
Yes. We supply top-quality NM400 wear plates from reputable mills.
4. What is the price of NM400 wear-resistant steel?
Pricing depends on thickness and quantity. Contact us for a competitive quote.
