Two wear liners cut from the same drawing can fail months apart. The difference traces back to one number: Brinell hardness. AR400 and AR500 both resist sliding abrasion, yet they behave differently under impact, under the torch, and on the maintenance budget.
What Are AR400 Steel Plates?
AR400 steel plates carry a through-hardness near 400 BHN, which mills reach by quenching and tempering a low-alloy carbon steel. Hardness resists gouging. Abrasive material sliding across the surface removes far less metal than it strips from mild steel at 120 BHN, so sliding-wear components stretch three to four times further between change-outs. Fabricators still cut, bend and weld 400 BHN plate with standard shop equipment, which is why it dominates general wear duty. Dump truck beds, grizzly hoppers, transfer chutes and conveyor skirting all run this grade where the load slides rather than slams. Material-handling equipment builders specify it for buckets, bin liners and apron feeder pans.
What Are AR500 Steel Plates?
AR500 steel plates sit roughly 100 Brinell points above AR400, near 500 BHN, after a tighter quench and a lower tempering temperature. It has a harder surface and slower wear. Operators reach for this grade when abrasive material arrives sharp, dry, and under pressure- conditions that damage 400 BHN liners inside a single season. Mining equipment carries it on shovel lips, crusher chute walls and dragline bucket floors. Screening systems take it as deck liners and wear bars. Heavy-duty liners inside bins and material-handling components also run 500 BHN plate where replacement downtime costs more than the steel.
AR400 vs AR500 Steel Plates: Key Differences
Hardness and Abrasion Resistance
AR400 lands near 400 BHN, AR500 near 500 BHN. Higher hardness slows sliding wear in direct proportion. Actual values depend on manufacturer specifications and plate thickness.
Toughness and Impact Resistance
If the hardness rises, toughness falls. AR400 absorbs repeated impact better, while AR500 risks cracking under heavy blows. Operating conditions, not the hardness figure alone, should drive grade selection.
Welding and Fabrication
Both grades need plasma or oxyfuel cutting and low-hydrogen consumables. AR500 demands tighter preheat and interpass temperature control. Follow manufacturer-recommended fabrication procedures for each thickness and joint type.
Cost and Service Life
AR500 costs more per tonne but wears slower. Weigh plate price against wear rate, liner change frequency and the production hours lost during every replacement shutdown.
AR400 vs AR500 Steel Plates: Comparison Table
The table below sets both grades against the factors that decide a wear plate order.
| Comparison Factor | AR400 Steel Plates | AR500 Steel Plates |
| Typical hardness | Around 400 BHN | Around 500 BHN |
| Abrasion resistance | High | Generally higher |
| Toughness | Depends on grade and product specifications | Depends on grade and product specifications |
| Fabrication | Requires appropriate wear-plate procedures | Often requires more stringent fabrication controls |
| Common applications | Truck beds, chutes, hoppers, and wear liners | Mining equipment, severe-wear liners, and screening systems |
| Selection priority | General abrasion resistance with practical fabrication needs | Severe abrasion where higher hardness is beneficial |
Applications of AR400 vs AR500 Steel Plates
Where Are AR400 Plates Commonly Used?
Construction machinery takes AR400 across bucket wear strips, blade liners and bolster plates. Truck beds, chutes and hoppers follow close behind, along with general-purpose wear liners across aggregate and cement plants. Moderate abrasion paired with frequent impact suits this grade, and shop fabrication stays simple at 400 BHN.
Where Are AR500 Plates Preferred?
Mining operations run AR500 where ore is hard and throughput stays high. Severe-wear liners, screening equipment panels, crusher side plates and chute impact zones all qualify. High-abrasion applications justify the extra cost per tonne through longer intervals between shutdowns and fewer liner replacements each year.
How to Choose Between AR400 and AR500 Steel Plates
Start with abrasion severity, then count how often the component takes impact alongside sliding contact, since a hard plate in a high-impact pocket cracks before it wears. Component design decides the next step: tight bend radii, thickness above 25 mm and welded-in corners all pull the choice toward AR400 for fabrication reasons. Check hardness specifications and manufacturer data against the drawing. Compare expected service life, maintenance frequency and total ownership cost across the equipment life.
Conclusion
AR400 and AR500 are separated by roughly 100 Brinell points, and that gap shapes wear rate, impact tolerance, cutting and welding practice, and where each plate earns its place on a machine. Match the grade to equipment requirements and operating conditions. Conquest Steel & Alloys stocks both grades at its Taloja and Kalamboli yards with plasma and oxyfuel cutting on site.
