AISI AR400 Alloy Steel | UNS GAR4000 Hot Rolled Bar Supplier

At SteelPro Group, we’ve spent over 20 years perfecting AR400 solutions. During this time, we’ve seen firsthand how this wear-resistant alloy can significantly reduce operational costs in industries like mining, construction, and material handling.

This guide simplifies the technical details to explain why AR400 is ideal for high-abrasion applications. We’ll highlight its key characteristics, such as its exceptional hardness and ability to withstand impacts. You’ll also see real-world examples, from quarry liners to heavy machinery components.

What Is AISI AR400 Steel?

AR400 steel is a high-carbon alloy formulated for durability in harsh, abrasive conditions. It achieves a surface hardness of 360-444 Brinell (BHN) through controlled heat treatment. This steel features a hardened outer layer and a tough inner core, providing an optimal balance between durability and structural integrity.

Engineered for moderate-impact sliding abrasion, AR400 outperforms structural steels like A36 in wear life, while offering greater machinability than harder AR450 grades. The AR400F variant also allows for complex cold-forming operations without sacrificing wear resistance.

AR400 Alloy Steel Key Characteristics

1. Optimized Surface Hardness

   
   

Delivers 360-444 BHN (Brinell Hardness Number) through precise quench-and-temper processing, creating a wear-resistant surface layer while maintaining core toughness.

2. Enhanced Corrosion Resistance

   
   

Features modified alloy chemistry for improved environmental durability in moderately corrosive conditions when combined with proper surface treatments.

3. Superior Abrasion-to-Weight Ratio

   
   

Provides longer service life than A36 steel in sliding abrasion environments at equivalent thickness.

4. Weld-Friendly Composition

   
   

Maintains joint integrity with common welding methods (SMAW, FCAW) and reduces preheat requirements compared to higher-grade abrasion-resistant steels.

5. Cost-Efficient Hardness Threshold

   
   

Balances wear resistance with better machinability than higher-grade AR steels.

AR400 Steel Mechanical Properties

AR400 Steel Applications

Mining & Quarrying

• Crusher liners for rock abrasion resistance
• Transfer chute liners for bulk material handling
• Dump truck bed armor systems

Construction Machinery

• Excavator bucket reinforcement components
• Bulldozer blade protection elements
• Concrete mixer wear-resistant internals

Material Handling

• Grain silo abrasion-resistant surfaces
• Conveyor system impact protection
• Industrial hopper transition components

Specialized Manufacturing

• Shot blast machine interior linings
• Recycling equipment shear blades
• Heavy transport equipment flooring

AR400 Steel Plate Sizes and Survives

SteelPro Group maintains extensive AR400 steel inventories. We offer both standard stock profiles and precision-engineered custom solutions. Our vertically integrated processing capabilities ensure rapid turnaround for critical wear component projects.

Standard Stock Availability

• Thickness range: 3/16″ to 6″ (4.7mm to 152mm)
• Plate widths up to 10ft (3m)
• Custom length cutting up to 40ft (12m)

Custom Fabrication Services
Advanced processing technologies meet exacting specifications

• Precision digital cutting (plasma/waterjet)
• Complex shape profiling
• Weld-ready edge preparation
• Surface finishing treatments

Our engineering team provides DFM (Design for Manufacturing) analysis to optimize material utilization and production efficiency. All processed materials include certified mill test reports and traceability documentation.

AR400 Steel vs Other Abrasion-Resistant Steels

While AR400 steel offers exceptional wear resistance, it’s important to compare it with other similar steels to understand its unique advantages:

AR400 steel vs AR450 Steel

AR450 has a higher hardness level (450 BHN) than AR400, but it also tends to be more brittle and less machinable. While AR450 excels in high-impact applications, AR400 offers better machinability, making it easier to cut and shape complex parts.

AR400 steel vs AR500 Steel

AR500 is harder than both AR400 and AR450 (500 BHN), which makes it suitable for extreme abrasion applications. However, the increased hardness also means reduced machinability and increased costs. AR400 is a more cost-effective choice for moderate-wear applications where machinability is crucial.

AR400 steel vs A36 Steel

A36 is a common carbon steel with lower strength and abrasion resistance than AR400. AR400’s superior hardness and wear life in sliding abrasion environments make it far more durable than A36, especially in harsh industrial settings.

AR400 Steel Benefits in High-Abrasion Environments

AR400 steel is a perfect option for sectors where machinery faces intense abrasion and damage. Its high hardness and superior resistance to abrasion make it an ideal option for parts exposed to intense friction and impact.

• Extended Equipment Lifespan: By providing excellent wear resistance, AR400 reduces the need for frequent maintenance and part replacement, resulting in cost savings over time.
• Improved Productivity: With its ability to withstand harsh conditions, AR400 reduces downtime, enabling operations to run smoothly without interruptions caused by equipment failure.
• Consistent Performance: AR400 maintains its hardness and wear resistance over extended periods, ensuring that machinery operates at peak performance for longer durations.

Explore Our AR400 Steel Inventory Today

At SteelPro Group, we transform AR400’s theoretical advantages into operational reality through:

1. Bespoke Fabrication – Laser-guided cutting for mining bucket templates
2. Certified Quality – Mill test reports with 3rd-party validation
3. Technical Partnership – Free wear pattern analysis for application optimization

Our in-house metallurgists ensure every AR400 plate exceeds ASTM specifications while maintaining weld-ready surface conditions.