AR400 Compared to Hardox 400
AR400 and Hardox 400 are often discussed as if they are the same material. That is understandable: both sit in the 400 HB hardness class and both are used for abrasion-resistant steel plate applications.
But for purchasing, fabrication, and equipment reliability, the better answer is more careful:
Hardox 400 is a branded wear plate from SSAB with published guarantees and controlled properties. AR400 is a generic abrasion-resistant steel category, and its exact performance depends on the mill, specification, heat treatment, thickness, chemistry, and test certificate.
So the real question is not only AR400 or Hardox 400? It is:
Do you need a generic 400 HB wear plate, or do you need the consistency, documentation, and brand-specific guarantees of Hardox 400?
Quick Comparison
This table gives the practical first-pass comparison. It should not replace checking the mill test certificate, thickness range, bendability requirement, welding procedure, and actual wear mechanism.
| Factor | Generic AR400 | Hardox 400 | Buyer Meaning |
|---|---|---|---|
| Material identity | Generic abrasion-resistant 400 HB class steel | Branded SSAB wear plate | AR400 varies by supplier; Hardox 400 has brand-controlled data |
| Typical hardness target | Usually around 360-440 HBW depending on supplier | SSAB publishes 370-430 HBW | Both are in the same hardness class, but check actual MTC |
| Traceability | Depends on mill and supplier documentation | Strong branded traceability and published product data | Important for OEMs and repeat production |
| Bendability and flatness | Supplier-dependent | Published guarantees from SSAB | Important for formed liners and fabricated parts |
| Availability | Often broad and price-driven | Depends on Hardox distribution and stock | Lead time may decide the practical choice |
| Best fit | Cost-sensitive wear parts where certified generic AR400 is acceptable | Applications needing consistent properties and premium documentation | The best choice depends on risk, budget, and duty |
The table shows the central difference. AR400 describes a hardness class. Hardox 400 is a specific branded product within that performance range. Two plates can have similar hardness but different consistency, toughness, bendability, weldability support, and documentation.
What AR400 Means
AR400 usually means abrasion-resistant steel plate with a nominal hardness around 400 Brinell. It is commonly used in buckets, dump truck liners, hoppers, chutes, guards, and material-handling equipment.
The challenge is that AR400 is a generic market term. One supplier’s AR400 may not be identical to another supplier’s AR400. Buyers should check the actual mill test certificate, hardness range, chemistry, impact toughness if needed, thickness tolerance, flatness, and recommended forming or welding practice.
HALDEN’s AR plate page is a useful internal reference for abrasion-resistant plate applications and procurement discussion.
What Hardox 400 Means
Hardox 400 is SSAB’s branded 400 HB wear plate. SSAB publishes a hardness range of 370-430 HBW and product information covering thickness range, mechanical properties, tolerances, and workshop recommendations.
This matters because Hardox is not just a hardness number. Buyers often choose it for repeatability, global recognition, documented properties, and confidence in fabrication behavior.
Hardness Is Important, But Not Enough
Hardness is often the first number buyers compare, but it is not the full performance story. Brinell hardness testing is standardized under methods such as ASTM E10, but two plates with similar HBW readings can still behave differently in forming, welding, cracking risk, and impact service.
| Property | Why It Matters | Risk If Ignored |
|---|---|---|
| Hardness | Improves resistance to sliding abrasion | Plate may wear too fast if hardness is low |
| Toughness | Helps resist cracking under impact | Hard plate may crack in impact zones |
| Through-thickness consistency | Supports predictable wear life | Surface hardness may not represent whole plate behavior |
| Bendability | Important for formed liners, buckets, and curved parts | Cracking during fabrication |
| Weldability | Controls preheat, filler, hydrogen cracking risk | Field failure around welds |
| Flatness and tolerance | Important for fitted liners and OEM parts | Poor fit-up and installation delays |
This is why a serious comparison should not stop at the phrase 400 HB. The buyer should compare the complete material package and the risk of the application.
Application Selection Matrix
The following matrix shows how to choose between generic AR400 and Hardox 400 in practical wear applications. It is a decision guide, not a universal rule.
| Application Situation | Generic AR400 May Be Enough | Hardox 400 May Be Better |
|---|---|---|
| Simple flat liner plates | Yes, if MTC and hardness meet requirement | Useful when repeat orders need consistent performance |
| OEM fabricated parts | Possible if supplier quality is stable | Often preferred for documentation and predictable forming |
| Curved or bent wear parts | Only if bend data is confirmed | Stronger choice when bendability guarantee matters |
| High-impact zones | Needs toughness confirmation | Still needs engineering review; hardness alone is not enough |
| Cost-sensitive replacement liners | Often attractive | May be over-specified if duty is low-risk |
| Critical uptime equipment | Only with strong supplier history | Often worth evaluating for consistency and lower failure risk |
The table makes the procurement logic clear: generic AR400 can be a good choice when the application is simple, the supplier is reliable, and the certificate is acceptable. Hardox 400 becomes more attractive when repeatability, forming quality, documented guarantees, and brand-backed data reduce the buyer’s risk.
Cost Comparison: Invoice Price vs Risk Cost
Hardox 400 may cost more than some generic AR400 offers, but price alone can mislead the decision. A cheaper plate that cracks during forming, wears faster, arrives with inconsistent hardness, or causes field fit-up delays can become more expensive over the maintenance cycle.
The following example is illustrative. Replace the numbers with real supplier quotations and plant data.
| Cost Factor | Generic AR400 Route | Hardox 400 Route |
|---|---|---|
| Plate purchase price | ,000 | ,280 |
| Fabrication and installation | ||
| Expected service life | 9 months | 12 months |
| Change-out downtime cost | ,500 | ,500 |
| Total route cost per cycle | ,100 | ,380 |
| Estimated monthly cost | /month | /month |
In this example, the premium plate has a higher invoice price but a lower monthly cost because it lasts longer. If the service life is the same, the generic AR400 route may be more economical. This is why actual wear-life data matters more than assumptions.
When Neither AR400 Nor Hardox 400 Is Enough
Both AR400 and Hardox 400 are wear-resistant steels, but they are not magic materials. In severe sliding abrasion, especially in cement, mining, quarrying, and bulk material transfer, a 400 HB plate may still wear too fast.
| Wear Condition | Problem with 400 HB Plate | Possible Upgrade |
|---|---|---|
| Severe sliding abrasion | Hardness may still be insufficient | Chromium carbide overlay plate |
| Repeated chute liner failure | Material flow may attack one path | Custom wear liner package |
| Localized edge or surface wear | Full plate replacement may waste material | Hardfacing repair or reinforcement |
| Impact plus gouging | Harder plate may crack if toughness is insufficient | Engineered liner with support and impact design |
| Corrosion plus abrasion | AR steel may not address corrosion | Corrosion-resistant liner or coating plus wear design |
This table is important for heavy industry buyers. Sometimes the real decision is not AR400 versus Hardox 400. It is whether a 400 HB wear plate is the right category at all.
Procurement Checklist
- Is the requirement truly AR400, or does the drawing specify Hardox 400 by brand?
- What hardness range is required, and where is hardness measured?
- Does the supplier provide a mill test certificate?
- Is thickness, flatness, and tolerance important for fit-up?
- Will the plate be bent, rolled, welded, drilled, or machined?
- Is impact toughness required for the application?
- What is the current plate’s actual service life?
- Is the wear mechanism sliding abrasion, gouging, impact, erosion, or corrosion?
- Would CCO plate or a custom wear liner reduce cost per ton better than a 400 HB plate?
- Is the decision driven by lowest purchase price or lowest lifecycle cost?
Conclusion
AR400 and Hardox 400 are similar in the sense that both are 400 HB-class abrasion-resistant steel plates. But they should not be treated as automatically identical.
Generic AR400 can be a practical and economical choice for many wear parts when the supplier is reliable and the certificate meets the requirement. Hardox 400 is often preferred when the buyer needs brand-backed consistency, documentation, bendability data, and repeatable performance.
The practical rule is:
Use generic AR400 when certified 400 HB wear plate is enough. Choose Hardox 400 when consistency, forming behavior, traceability, and risk reduction justify the premium. Consider CCO plate or engineered wear liners when 400 HB steel is not enough for the wear mechanism.
Planning a wear or welding project? Review HALDEN’s custom bucket wear plates, or send your drawing and operating conditions for a practical recommendation.
