Wear Resistant Steel Plate Guide: AR400, AR500, NM400, NM500 — Applications and Buying Tips
Wear Resistant Steel Plate Guide: AR400, AR500, NM400, NM500 — Applications and Buying Tips
Wear resistant steel plate — often called abrasion resistant (AR) or 耐磨 steel — is engineered for one job: surviving friction, impact and abrasion that would quickly destroy ordinary structural steel.
From excavator buckets and crusher liners to dump truck bodies and conveyor chutes, wear plate extends equipment life and cuts replacement costs. But the range of grades — AR400, AR500, NM400, NM500, Hardox®, and more — can be confusing. This guide explains the differences and how to buy the right grade.
What Makes “Wear Plate” Different
Wear resistant plate is a quenched and tempered (QT) or thermomechanically processed steel with high hardness — typically 360–550 HBW — achieved through controlled heat treatment. The hardness is what gives it abrasion resistance: a harder surface wears away more slowly under friction and impact.
Compared with structural plate (A36, Q235B), wear plate:
- is much harder (roughly 2–3× the hardness of structural steel);
- is harder to cut, bend and weld (special techniques required);
- costs more per tonne — but lasts several times longer in abrasive service.
AR vs NM: Two Naming Systems
- AR grades (AR400, AR500, AR450) follow international / ASTM-style naming: “AR” = Abrasion Resistant, and the number indicates the nominal Brinell hardness in HBW. AR400 ≈ 400 HBW, AR500 ≈ 500 HBW.
- NM grades (NM360, NM400, NM450, NM500) are the Chinese GB equivalent (耐磨 = wear-resistant). NM400 ≈ 400 HBW, NM500 ≈ 500 HBW.
In practice, AR400 and NM400 are equivalent material families, as are AR500 and NM500 — supplied under different standard systems. Leading brands such as Hardox® (SSAB) and TBL (NLMK) are named differently again but fall in the same hardness ranges.
The Main Grades Compared
| Grade | Hardness (HBW) | Typical applications |
|---|---|---|
| AR400 / NM400 | ~360–440 | Excavator buckets, chutes, hoppers, conveyor components, dump truck liners |
| AR450 / NM450 | ~430–480 | Higher-impact applications, thicker liners |
| AR500 / NM500 | ~470–540 | Crusher liners, high-impact wear parts, screening and heavy abrasion |
| AR600 / NM600 | ~570–640 | Extreme abrasion — specialized, hard to form and weld |
AR400 / NM400 — the all-rounder
The most popular wear plate grade. It balances hardness, toughness, formability and weldability. Use it for general abrasion: liners, buckets, chutes, truck bodies and hoppers. It is the easiest wear grade to fabricate, so it is the default for most applications.
AR500 / NM500 — for heavy impact and extreme abrasion
Harder and more wear-resistant, but also more difficult to form and weld. Use it where impact is severe — crushers, hammers, screening equipment and thick high-wear liners. Expect higher consumable costs in fabrication and more attention to preheating and welding procedure.
Applications Across Industries
- Mining: excavator buckets, dump truck bodies, crusher liners, conveyor chutes, screen decks;
- Cement & aggregates: chutes, hoppers, mixer liners, wear plates;
- Steel mills: guide plates, transfer chutes, wear strips;
- Construction: concrete pump wear parts, screed plates, bucket teeth and edges;
- Agriculture: plow shares, grain handling equipment, silo wear liners;
- Material handling: hoppers, feeders, diverters, wear rails.
Fabricating Wear Plate: What to Know
Wear plate is not handled like structural steel. Key considerations:
- Cutting: CNC plasma or laser cutting works, but the heat-affected zone can harden the cut edge — thicker and higher-hardness plate may need edge preparation before welding. Waterjet cutting avoids heat-affected zones entirely and is preferred for finished edges.
- Bending: High hardness means lower ductility. Bending must follow minimum radius guidelines, and thicker/harder plate may require preheating.
- Welding: Use low-hydrogen consumables and controlled preheat/interpass temperatures to avoid hydrogen cracking in the hard plate. The weld filler is usually softer than the parent plate by design — the goal is a tough, crack-free joint, not matching hardness.
- Drilling and machining: Carbide tooling is required; standard HSS tools wear out quickly.
A fabricator with experience in wear plate (not just structural steel) is essential — mistakes are expensive.
How to Choose the Right Wear Plate
- Define the failure mode. Is the part failing by sliding abrasion, impact, or both? Sliding abrasion favors higher hardness; impact favors a balance of hardness and toughness.
- Match hardness to the application. Don’t buy AR500 where AR400 works — harder plate costs more and is harder to fabricate.
- Consider plate thickness. Thicker wear plate provides longer life; combine thickness and hardness to hit your target service life at the lowest total cost.
- Check weldability requirements. If the part will be heavily welded, a slightly softer grade (AR400 over AR500) may be the smarter overall choice.
- Ask for hardness and composition data. Request mill test certificates confirming hardness range, chemical composition and mechanical properties.
Buy Wear Plate with Processing Support
Wear plate is most valuable when it arrives already cut, drilled and formed to your drawing. SteelGuang supplies NM/AR series wear resistant plate (NM360 to NM600 equivalents) and operates in-house CNC plasma/laser cutting, punching and bending — with experience handling high-hardness steel.
We can deliver finished wear parts (buckets, liners, chutes) rather than raw plate, reducing the fabrication burden on your side. Request a quotation for your wear parts or browse our steel products. Tell us the application and current part life, and we will recommend the grade and processing plan.