What Is NM400 Steel Plate?

NM400 steel plate is a high-strength wear-resistant steel plate, where “NM” stands for “Nai Mo” (wear-resistant in Chinese) and “400” represents its Brinell hardness grade. The typical hardness range of NM400 is approximately 370-430 HBW. It is manufactured through alloy composition optimization and quenching & tempering heat treatment processes, giving it excellent wear resistance, high strength, and good impact toughness.

Compared with ordinary carbon steel plates, NM400 steel plates can withstand continuous abrasion caused by hard materials such as ores, rocks, coal, and sand. Therefore, they are widely used in mining equipment, construction machinery, transportation vehicles, and heavy industrial applications.

The main advantage of NM400 steel plate is that it can extend equipment service life, reduce maintenance frequency, and lower long-term operating costs while maintaining sufficient structural strength. For components exposed to severe abrasion, impact, and heavy loads, NM400 is an economical and reliable material choice.

NM400 Steel Plate Specifications

NM400 steel plates are generally manufactured according to the Chinese standard GB/T 24186. Customized wear-resistant steel solutions can also be supplied according to customer requirements.

Common thicknesses include:

• 6 mm
• 8 mm
• 10 mm
• 12 mm
• 16 mm
• 20 mm
• 25 mm
• 30 mm
• 40 mm
• 50 mm

Different thicknesses can be selected according to application requirements. For example, light-duty wear-resistant components usually use 6-12 mm plates, while large mining equipment liners often require plates above 20 mm.

Chemical Composition of NM400 Steel Plate

NM400 achieves high hardness and excellent wear resistance through optimized alloying elements. The typical chemical composition is shown below:

The role of alloying elements:

• Carbon (C) improves hardness and wear resistance.
• Manganese (Mn) enhances strength and hardenability.
• Chromium (Cr) improves abrasion resistance and durability.
• Nickel (Ni) and Molybdenum (Mo) improve toughness and ensure stable performance under impact and low-temperature conditions.

Through balanced alloy design, NM400 achieves a good combination of hardness, strength, and toughness, reducing the risk of cracking during heavy-duty operation.

Mechanical and Physical Properties of NM400 Steel Plate

NM400 provides not only high hardness but also excellent comprehensive mechanical properties.

Compared with ordinary Q235 carbon steel plates (yield strength approximately 235 MPa), NM400 offers much higher strength levels. This allows manufacturers to use thinner plates while maintaining the required structural performance, helping reduce equipment weight and improve operational efficiency.

For example, in mining truck body manufacturing, replacing conventional steel plates with NM400 can significantly reduce wear damage, extend service intervals, and improve transportation efficiency.

Applications of NM400 Steel Plate

1. Mining Machinery and Equipment

Mining environments are among the most demanding applications for wear-resistant steel.

During mining operations, equipment is continuously exposed to hard ores and abrasive materials, causing severe surface wear. NM400 is commonly used for:

• Crusher liners
• Vibrating screen plates
• Ore chutes
• Hoppers
• Wear-resistant components for loading equipment

Its high hardness effectively resists impact and abrasion, improving equipment reliability and service life.

2. Construction Machinery

Construction machinery operates under harsh conditions involving soil, gravel, and heavy impact loads.

NM400 steel plates are widely used in:

• Excavator buckets
• Loader buckets
• Bulldozer cutting edges
• Concrete mixing equipment liners
• Heavy-duty vehicle components

Compared with ordinary steel, NM400 reduces wear on working surfaces and improves the durability of machinery components.

3. Coal, Cement and Metallurgical Industries

Industries such as coal processing, cement production, and steel manufacturing involve continuous transportation of abrasive materials.

NM400 can be used for:

• Coal bunker liners
• Conveyor wear plates
• Cement mill liners
• Blast furnace feeding equipment
• Steel plant transportation equipment

By using NM400 wear-resistant steel plates, companies can reduce replacement frequency and improve production efficiency.

When Should You Choose NM400 Steel Plate?

Customers usually choose NM400 steel plates in the following situations:

1. Equipment Faces Continuous Wear

If equipment operates in environments containing abrasive materials such as rocks, minerals, coal, or sand, and ordinary steel plates wear out quickly, NM400 provides a longer-lasting solution.

2. Lower Maintenance Costs Are Required

Although NM400 has a higher initial purchase cost than standard carbon steel, its extended service life helps reduce downtime, replacement costs, and maintenance expenses.

3. Both Wear Resistance and Impact Strength Are Needed

Some applications require resistance to both abrasion and heavy impact, such as mining trucks and crushing equipment. NM400 provides a better balance between hardness and toughness.

4. Lightweight Equipment Design Is Required

Due to its high strength, NM400 can replace thicker conventional steel plates, helping reduce overall equipment weight while maintaining performance.

NM400 Steel Plate Supply and Services We Provide

As a professional steel supplier, we provide not only NM400 steel plates but also customized solutions based on customer project requirements.

Multi-Size Supply

We can supply NM400 steel plates in various thicknesses, widths, and lengths to meet different requirements in mining equipment, construction machinery, and industrial applications.

Customized Cutting and Processing

According to customer drawings, we provide:

• CNC flame cutting
• Laser cutting
• CNC cutting
• Drilling
• Welding fabrication

These services help customers reduce processing time and improve production efficiency.

Quality Inspection and Certification

Each batch of NM400 steel plates can be supplied with:

• Chemical composition inspection reports
• Mechanical property testing
• Hardness testing
• Ultrasonic testing
• Mill Test Certificate (MTC)

These inspections ensure that the steel plates meet project quality requirements.

Global Shipping Solutions

We provide export-standard packaging, rust protection, and transportation solutions to ensure NM400 steel plates arrive safely at the project site.

NM400 steel plate has become an important material in mining, construction machinery, transportation equipment, and heavy industries due to its 370-430 HBW hardness, ≥1000 MPa yield strength, excellent wear resistance, and strong impact toughness.

For projects requiring long-term resistance to abrasion, impact, and heavy loads, NM400 provides an effective solution to extend equipment lifespan and reduce operating costs. With professional supply capabilities, customized processing services, and strict quality control, we can provide customers with complete NM400 steel plate solutions from raw material supply to finished components.