NM400 vs NM500: The Ultimate Guide to Wear-Resistant Steel Liners in Sand & Gravel Production Lines

In the sand and gravel aggregate industry, equipment wear is the leading cause of unplanned downtime and rising operational costs. From primary crushers to final discharge chutes, every component is subjected to intense impact and abrasion. Traditional casting solutions, such as High Manganese Steel, are increasingly being replaced by advanced Wear-Resistant Steel Plates.

As a leading global supplier, GNEE Steel provides high-performance NM plates (NM400, NM450, NM500, NM500H) designed to withstand the harshest quarrying environments.

Wear-resistant steel is not just a raw material; it is a precision-engineered component. GNEE Steel utilizes state-of-the-art manufacturing processes to transform steel plates into custom liners:

• Precision Cutting: Utilizing laser, plasma, or waterjet cutting to ensure liners fit perfectly into equipment housings.
• Rolling & Deformation: Shaping plates to meet the geometric requirements of cone crusher guards or curved chutes.
• Drilling & Milling: Creating precise bolt holes and threaded teeth for secure installation and easy replacement.

Many operators still use high manganese castings like Mn13 or Mn18. However, modern wear-resistant steel plates offer two decisive advantages:

Superior Performance in Low-to-Medium Impact

High manganese castings rely on "Work Hardening." They only reach maximum hardness when subjected to extreme impact. In many parts of a sand production line-such as feeders and hoppers-the impact is insufficient to trigger this hardening. Consequently, the material wears away prematurely.
 

GNEE's NM-series steel is delivered in a quenched and tempered state, meaning it possesses high hardness from day one, regardless of impact levels.

Uniform Structure & Anti-Fracture Reliability

In high-stress environments, high-manganese castings can develop internal brittleness, leading to surface spalling or sudden catastrophic failure.
 

NM Wear-Resistant Steel is a quenched and tempered (Q&T) alloy with a highly uniform grain structure. It maintains consistent toughness and hardness from the surface to the core, eliminating the risk of brittle fracture even as the liner thins.

Selecting the right grade depends on the crushing principle and material size. Below is GNEE Steel's recommendation matrix for aggregate production lines:

 

 

 

Understanding NM-Series Performance

 

• NM400 / NM450: The cost-effective standard for general-purpose wear protection. Excellent weldability and cold-bending properties.
• NM500 / NM500H: High-hardness grades for extreme wear zones. Significantly reduces the frequency of liner replacements.
• NM450SP / NM500SP: Optimized for specialized processing, offering a superior balance between extreme surface hardness and manufacturing workability.

In the sand and gravel industry, profitability is measured by Cost Per Ton. By upgrading your wear parts from traditional castings to GNEE Steel's NM-series plates, you achieve:

• Extended Service Life: 30% to 50% increase in liner longevity.
• Operational Safety: Eliminated risk of brittle liner failure.
• Lower Maintenance Costs: Reduced labor and downtime for part swaps.

Consult with GNEE Steel Experts Today

Not sure which grade is right for your crusher or hopper? Contact our technical consultants. We provide not only high-quality NM400/500 plates but also one-stop solutions from technical drawings to finished, ready-to-install liners.

Contact us for a quote: [alloy@gneesteelgroup.com]

What are the properties of NM450 material?

Here are the standout features of NM450 steel properties that set it apart: High Hardness and Abrasion Resistance: At 450 HBW, NM450 provides excellent protection against wear. This hardness level ensures it can handle abrasive conditions better than softer steels, making it suitable for high-impact environments.

What is NM400 steel?

NM400 is a type of wear-resistant steel plate, with a Brinell hardness value of HB. The hardness value of NM400 is broad, ranging from 360 to 420

What is the difference between NM450 and Hardox 450?

NM450: NM450 is a wear-resistant steel grade produced by a variety of manufacturers. It does not have a specific brand name associated with it. Hardox 450: Hardox 450 is a brand of abrasion-resistant steel manufactured by GNEE, a Swedish steel company. Hardox is a well-known and widely used brand in the industry.

What is the difference between Hardox 400 and NM400?

Choose NM400 if you need a cost-effective solution for high-wear applications in construction and mining where budget is a primary concern. Choose Hardox 400 for applications requiring higher impact resistance and durability, especially in colder environments or where structural consistency is key

What is the difference between AR500 and NM500?

NM500and AR500 are both high-hardness (approx. 500 HBW) abrasion-resistant steel plates designed for extreme wear environments, such as mining and heavy machinery. While they share similar wear resistance, AR500 is often a proprietary Western standard used for armored targets, whereas NM500 is a Chinese standard often viewed as an equivalent

Which is harder, AR400 or AR500?

Frequently Asked Questions About AR400 and AR500 Steel
AR 500 is harder (at 500 Brinell) and has better abrasion resistance, while AR 400 (400 Brinell) is easier to machine and weld.

Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.

GNEE STEEL  PROCESSING

CTL&SL

Grinding Polishing

Cutting

Beveling

Forming

Maching

Auto Welding

Heat treatment

Painting

Engineering Services

1.CTL & SL SERVICE (141 SETS)

Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.

CTL FACILITIES
Max Length:16500mm

Max Width:2200mm

Max Thickness:25.4mm

Max Yield Strength:1500Mpa
SL FACILITIES

Max Width:2200mm

Max Thickness:18mm

Max slit Quantity:31

Max Yield Strength:1200Mpa

2.CUTTING SERVICE

GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.

Laser Cutting Machine

Max Cutting Length:40,000mm

Max Width:4,600mm
Max Thickness:100mm

Flame Cutting Machine

Max Cutting Length:40,000mm

Max Width:8,000mm
Max Thickness:500mm

Plasmas Cutting Machine

Max Cutting Length:30,000mm

Max Width:5,000mm
Max Thickness:100mm

Water-jet Cutting

Max Cutting Length:12,000mm

Max Width:4,010mm
Max Thickness:250mm

3.FORMING SERVICE

Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm

Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm

Expert in Bending High-Strength & Wear-Resistant Steels

Punching Machine

Max Width:3,070mm
Max Thickness:8mm

Max Pressure:250t

BEVELING SERVICE

GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.

Milling：
Max Cutting Length:18,000mm

Max Width:4500mm
Max Thickness:120mm

Beveling:
Max Length:16,000mm

Max Thickness:80mm

MACHINING SERVICE

GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.

Gantry Type Boring & Milling Maching Center

Max Length:48000mm

Max Width:12500mm
Max Height:8000mm

Max Diameter:10500mm

Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm

MMulti-hole Drilling Equipment

Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm

Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m

Vertical Lathe

Max Height:6,000mm

Max Diametar:φ22,00mm

Automated Edge Milling Machine

The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.

It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.

Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.

Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons

This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.

• Processing Accuracy

Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;

Width accuracy: ±1mm;

Diagonal accuracy: ±2mm;

Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.

• Processing Efficiency

The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.

HEAT TREATMENT

Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t

Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head

GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.

One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.

Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production

Project Materials and Technical Requirements

The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.

Key technical specifications include:

• Material grades: P355NL2 and P275NL2 (Normalized)
• Yield strength: Standard minimum / Maximum limited to 390 MPa
• Hardness: ≤ 225 HBW in base material
• Impact testing: Charpy-V notch test at -50°C, minimum 27J
• Certification: EN 10204 3.1 certificate, with optional 3.2 certification

These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.

Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.

Project Plate Quantities and Thickness Distribution

The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:

P355NL2 – Inner & Outer Tank Shell Plates

• Lower shell courses: 50 mm thickness – approx. 2,000 tons
• Middle shell courses: 25 mm thickness – approx. 1,400 tons
• Upper shell courses: 10 mm thickness – approx. 500 tons

P275NL2 – Tank Bottom Plates

• Thickness: 10–15 mm – approx. 750 tons

P275NL2 – Suspended Roof Structure

• Thickness: 5–8 mm – approx. 180 tons

S275JR – Outer Roof (Ambient Structure)

• Thickness: 10 mm – approx. 450 tons

To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.

Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.

GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.

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Stainless Steel Material and Surface Specifications

Special Steel / Nickel Base Alloy