As a leading supplier of NM400 wear plate in China, we understand that choosing the right abrasion-resistant steel is critical for improving equipment life and reducing maintenance costs. Among all wear-resistant grades, NM400 and NM500 are the most commonly used.
NM400 wear plate
Mechanical Properties of NM400 vs NM500
| Grade | Hardness Range (HBW) | Key Feature |
|---|---|---|
| NM400 | 360–440 | Balanced wear resistance + toughness |
| NM500 | 480–550 | Higher hardness, stronger wear resistance |
NM400 provides an excellent balance between wear resistance and impact toughness. NM500 offers higher hardness but tends to be more brittle
NM400 performs better under combined wear and impact conditions.
Chemical Composition of NM400 vs NM500
Both grades are alloyed to ensure strong metallurgical bonding between the wear-resistant layer and base steel. The chemical composition affects weldability, toughness, and wear resistance.
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| NM400 | 0.12 | 1.00 | 0.30 | ≤0.025 | ≤0.015 | 0.30 | 0.30 | 0.15 |
| NM500 | 0.18 | 1.20 | 0.30 | ≤0.025 | ≤0.015 | 0.50 | 0.30 | 0.20 |
Insight: NM400's lower carbon content improves weldability and reduces cracking risk during fabrication, making it ideal for complex structures.
NM400 wear plate is typically supplied in hot-rolled plates ranging from 6 mm to 120 mm thickness, with widths up to 2500 mm. It can be cut, welded, and machined with standard equipment, while NM500, due to its higher hardness, requires stricter heat control and specialized welding procedures.
This makes NM400 more suitable for applications requiring ease of fabrication, on-site welding, or multi-layer composite wear plates.
Industrial Applications of NM400 vs NM500
NM400 is widely applied across industries where equipment faces abrasive and impact wear:
- Power Plants: Coal mill liners, fan housings, dust collector ducts, ash handling systems.
- Mining & Minerals: Crusher liners, chutes, hoppers, ball mill liners, dump truck floors.
- Cement Industry: Cyclone separators, screw conveyors, recycle hoppers, conveyor tank liners.
- Construction Machinery: Excavator buckets, bulldozer blades, loader plates, concrete mixer liners.
- Metallurgical Equipment: Iron ore sintering machine liners, scraper plates, elbow liners.
NM500 is typically reserved for extreme abrasion situations with minimal impact, such as heavy slurry pipelines or ultra-high-wear liners.
Why Choose NM400 Wear Plate
While NM500 offers higher hardness, NM400 provides the best combination of performance, weldability, and cost-effectiveness for most industrial applications. Its balance of toughness and abrasion resistance ensures longer service life, reduced maintenance, and lower overall project costs.
If you are looking for high-quality NM400 wear plates in China, contact us today for competitive pricing and reliable supply. Protect your equipment and reduce maintenance costs with the right wear-resistant steel.
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What is NM400 steel?
NM400 Steel 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 is important, such as in the construction and mining sectors.
What is the difference between Hardox 400 and NM400?
Hardox 400 generally contains a higher chromium (Cr) and nickel (Ni) content, which contributes to better hardness and toughness, while NM400 maintains a balance between cost and performance.
What is the difference between AR 400 and NM400?
NM400 offers cost-effectiveness and low-temperature toughness, making it ideal for budget-conscious projects in moderate wear environments. AR400, with its superior impact resistance and formability, excels in high-impact applications requiring complex fabrication.
Can NM400 be reheated or heat-treated during processing?
This is one of the most critical warnings for first-time users.
NM400 steel plate must not undergo secondary high-temperature heat treatment. The material achieves its wear resistance through a quenched and tempered (Q+T) process. If reheated to high temperatures-such as flame heating for easier bending-the internal microstructure will be altered, resulting in a permanent loss of hardness and wear resistance.
Additionally, the recommended service temperature for NM400 is generally below 250°C–300°C. Exceeding this range may reduce its mechanical properties unless specially alloyed grades (with elements like Mo or V) are used.