What Is NM400 Wear Resistant Steel Plate?
NM400 is a high-strength wear-resistant steel plate. Its designation derives from the initials of the Chinese pinyin for "wear resistance". The number 400 refers to its Brinell hardness rating, with surface hardness ranging from 360 to 450 HB. Its mechanical strength is 3 to 5 times that of ordinary low-alloy steel plates, and it is supplied in quenched and tempered condition.
The service life of NM400 wear-resistant steel plate is not fixed, which mainly depends on the service environment and production process. To extend its service life, anti-corrosion treatment is carried out on both the outer surface and inner bore of NM400 wear-resistant steel plate.
Contact us now for the latest price quote for NM400.
Factors That Influence Lifespan
Material Hardness & Impact Force：
NM400 is rated at approximately 360–440 HBW (Brinell Hardness). If the material being processed is significantly harder than the plate, or subjected to extreme continuous impact, wear will accelerate. For these heavy-duty scenarios, upgrading to a harder plate like NM500 is usually required.
Fabrication and Welding：
Improper welding or cutting-such as failing to preheat the steel or using incorrect electrodes-can soften the plate's heat-affected zone (HAZ), resulting in premature failure.
Abrasion vs. Impact：
NM400 provides an excellent balance of both. However, extreme gouging impact (like direct drops of heavy rock) will degrade it faster than pure sliding abrasion (like fine sand).
What factors will affect the wear rate?
| Influencing Factor | Impact on Wear Rate |
|---|---|
| Higher hardness of abrasive materials | Faster wear rate |
| Larger impact load | Significant increase in localized wear |
| Faster material flow velocity | Aggravated abrasion |
| Larger particle size | Prone to cutting wear |
| Higher operating temperature | Potential drop in steel plate hardness |
| Presence of corrosive media | Combined corrosion and abrasion accelerates component failure |
| Improper welding or installation | Likely to cause abnormal localized wear |
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 |
NM400 Mechanical Properties
Steel NM 400 sheet or plate is renowned for its exceptional properties, including high tensile strength, superior wear resistance, and excellent durability. These properties make it an ideal material for applications where high resistance to wear and tear is crucial.
| Mechanical properties of NM 400 | |||
| Grade | Mechanical Property | ||
| NM 400 | Yield | Tensile | Elongation |
| Min Mpa | Mpa | Min % | |
| 1000 | 1200 | 10 | |
| NM400 | Thickness | Hardness (HB) |
| ≤80mm | 370~430 | |
| ＞80~120mm | 360~440 |
NM400 Plate Standard Supply Size
| Thickness (mm) | Standard Width (mm) | Standard Length (mm) | Delivery Condition | Availability |
|---|---|---|---|---|
| 3–5 | 1000 / 1250 / 1500 | 2000–6000 | Quenched & Tempered (QT) | Produced on Request |
| 6–11 | 1500 / 1800 / 2000 | 3000–12000 | Quenched & Tempered (QT) | Regular Stock |
| 12–24 | 1500 / 2000 / 2200 | 3000–12000 | Quenched & Tempered (QT) | Regular Stock |
| 25–49 | 2000 / 2200 / 2500 | 6000–12000 | Quenched & Tempered (QT) | Regular Stock |
| 50–79 | 2000 / 2200 | 6000–10000 | Quenched & Tempered (QT) | Mill Rolling |
| 80–120 | 2000 / 2200 | 6000–9000 | Quenched & Tempered (QT) | Subject to Production Schedule |
Custom cutting, flame cutting, plasma cutting and beveling services are available upon request.
NM400 Service Life Under Various Working Conditions
| Application | Typical Service Life |
|---|---|
| Excavator Bucket | 6–18 months |
| Dump Truck Liner | 1–3 years |
| Mining Chute | 8–24 months |
| Conveyor Liner | 1–5 years |
| Cement Equipment | 2–6 years |
How To Calculate NM400 Service Life?
The most commonly used calculation formula is as follows:
Service Life = Available Wear Thickness ÷ Average Wear Rate
Where：
Available Wear Thickness：The allowable wear thickness of the steel plate while ensuring safe equipment operation.
Average Wear Rate：The average worn thickness of the steel plate per unit time, generally expressed in mm/year or mm/month.
This method is widely adopted for equipment maintenance, spare parts procurement and service life prediction.
Send us your working temperature, material flow and equipment running hours, our engineers will calculate the accurate service life & recommend cost-effective NM400/NM450HiTemp plate solutions for free. Get customized quotation within 24 hours!
Contact us now for the latest price quote for NM400.
What are the advantages of NM400 wear plate?
Balanced Hardness and Fabrication Performance.
For plates up to 80 mm thick, the surface hardness of NM400 is normally controlled within the range of 370–430 HBW. It delivers reliable abrasion resistance while being far easier to weld, bend and machine compared with higher-hardness grades such as NM500.
Longer Service Life Than Conventional Structural Steel.
Under sliding abrasion conditions, the service life of NM400 wear-resistant steel plate is generally 3 to 5 times that of common structural steels such as Q235 and Q355. In heavily abrasive working conditions, its service life can reach 5 to 7 times in some applications. The actual service life depends on material type, impact load and service environment.
Reduce maintenance downtime frequency.
For wear parts, material costs usually only account for a portion of the equipment's full life-cycle cost, while expenses from production shutdowns, component replacement and maintenance labor tend to be much higher. The use of NM400 reduces the frequency of wear part replacements, which in turn cuts equipment downtime and maintenance labor costs.
Satisfy the requirements of multiple processing techniques.
NM400 is suitable for wear-resistant service conditions while maintaining favorable fabrication performance.
Available processing methods
Flame cutting
Plasma cutting
Laser cutting
Drilling
Cold bending
Welding
Material Selection Recommendations
When choosing between NM400, NM450 and NM500 wear plates, hardness should not be the sole criterion. A comprehensive evaluation based on actual working conditions is required.
General selection guidelines：
- For medium abrasion applications requiring good workability and cost performance, NM400 is the optimal option.
- For high abrasion scenarios where workability also needs to be maintained, NM450 serves as the most balanced upgrade solution.
- For extreme abrasive wear conditions with high downtime costs and minor impact loads, NM500 delivers significantly extended service life.
Share your abrasion level, impact intensity and production downtime cost with us. Our technical team will recommend the most suitable wear grade and send you a full cost-benefit analysis report free of charge.
Contact us now for the latest price quote for NM400.
Jaw Plates / Liner Plates for Large Open-Pit Mine Crushers：
Case: An iron mine replaced original high-manganese steel jaw plates with 16–20 mm NM400 wear plates. Service life extended from 3 months to 8–10 months, cutting annual maintenance costs by 40%.
Performance: Resists ore impact and abrasive grinding, reduces edge chipping and cracking, and drastically lowers downtime for part replacement.
Mining Dump Truck Body (Floor + Side Panels)：
Case: A coal mine fitted its 50-ton mining trucks with integrally welded 12–16 mm NM400 plates. Ordinary steel plates wore through in just 3 months, while NM400 lasts 1.5–2 years.
Advantages: Fewer welding seams, excellent resistance to ore impact and sliding abrasion, overall service life of truck bodies increased by over 3 times.
FAQ:
1.Is NM400 Steel suitable for heavy machinery construction?
Absolutely, its high strength and wear resistance make it ideal for such applications.
2.What is NM400 steel wear resistant steel price?
Contact Dongguan Otai Special Steel at jeremy@otaisteel.com or via WhatsApp at +8613610149979 for reliable and quality NM400 material and best price.
3.Can you supply 8mm wear resistant steel plate NM400?
Yes, we can supply nm400 plate 8mm. We are able to supply nm 400 material from 3mm to 120mm actually.
4.Are you NM400 steel plate factory?
Yes, we supply top quality NM 400 steel plate from top factories.
5.What are the applications of NM400 abrasion-resistant steel?
It is extensively used in heavy machinery, mining tools, and any equipment where high resistance to abrasion is required.
