Abrasion-resistant steel plates are used in equipment that deals with constant wear, impact, and friction. Maintenance costs and downtime increase due to wear without the right plate. Industries like mining, construction, cement processing, and recycling depend on these materials to keep equipment running longer.
Hardox® 400 Plate is one of the most used grades. The Hardox® range by SSAB covers multiple hardness levels, each suited to different conditions for different requirements. Hardox® 400 and Hardox® 450 are the two most compared grades. Both are reliable, but serve different needs and are not interchangeable.
What is Hardox® 400 Plate?
Hardox® 400 has a hardness range of about 370 to 430 HBW. Hardox® 400 plate for construction machinery parts resists wear and increases toughness with easy processing, since standard welding, bending and machining methods can be used in production or for on-site changes.
It also has strong impact resistance. The plate absorbs shock without cracking, so it is a practical choice for construction machinery parts, agricultural equipment, and structural components that must withstand both abrasion and repeated impact while still allowing forming.
What is Hardox® 450 Plate?
Hardox® 450 sits higher in hardness, at approximately 425 to 475 HBW. This additional hardness slows down surface wear in abrasive environments, and it lasts noticeably longer than the 400 grade.
Workability is where it compromises. Bending is more limited, and welding requires additional care. It is less forgiving during fabrication. For high‑abrasion applications such as mining or bulk material handling, the extended service life generally justifies these limitations.
Key Differences Between Hardox® 400 Plate and Hardox® 450 Plate
Both grades are built for wear resistance, but perform differently depending on the application. Hardness, strength, impact tolerance, workability, and service life all vary between them.
Hardness and Wear Resistance
Hardox® 400 runs at 370 to 430 HBW. Hardox® 450 sits higher at 425 to 475 HBW. That gap in hardness means the 450 grade wears slowly under abrasive contact, which matters in continuous high-abrasion conditions.
Strength and Durability
Hardox® 450 has higher tensile and yield strength compared to the 400 grade. It holds up better under constant load or structural stress. Hardox® 400 is durable but performs more reliably in moderate load conditions than in heavy-duty stress.
Impact Resistance
Hardox® 400 handles sudden impact better. It absorbs shock without fracturing, which the 450 grade is less suited for. Where equipment takes repeated hits or drop loads, the 400 grade is safer for avoiding cracks or premature failure.
Fabrication and Workability
Hardox® 400 is easier to cut, weld, and bend with standard methods. Hardox® 450 needs stricter bending and welding controls, so Hardox® 400 is more practical for formed or on-site modified parts.
Service Life
In high-abrasion environments, Hardox® 450 lasts longer. In mixed conditions involving both wear and impact, Hardox® 400 outlasts the 450 grade because it handles combined stress without cracking or fatigue.
Applications of Hardox® 400 Plate
Hardox® 400 suits equipment that faces a mix of wear, impact, and fabrication needs.
- Dump truck bodies: Truck beds take constant abrasion from material and impact while loading. Hardox® 400 resists both and can be formed to suit different body designs.
- Agricultural machinery: Ploughs, tillers, and soil tools wear steadily in field conditions. Hardox® 400 offers solid wear resistance and is easy to fabricate.
- Loader buckets: Buckets face heavy impact and abrasion during digging and loading. The toughness of Hardox® 400 performs well under these combined conditions.
- Structural components: Formed parts that still need wear resistance are often better made from Hardox® 400 than from harder grades.
Applications of Hardox® 450 Plate
Hardox® 450 is used where abrasion is the primary concern and wear resistance takes priority.
- Mining equipment: Rock and ore create severe abrasion on working surfaces. Hardox® 450 significantly increases the service life of buckets, chutes, and wear liners.
- Crushers and screens: Internal parts see continuous heavy abrasion. Hardox® 450 cuts down how often these components need replacement.
- Conveyor systems: Pans, troughs, and side walls that carry abrasive materials wear fast. Hardox® 450 liners last longer and have lower maintenance demands.
- Heavy-duty liners and wear parts: In hoppers, slag pots, and chute liners, wear is the main cause of failure. Hardox® 450 extends service intervals in these applications.
How to Choose Between Hardox® 400 and 450
Choose Hardox® 400 Plate When:
Impact matters as much as abrasion, fabrication is required, or the application sees mixed wear conditions. Hardox® 400 absorbs stress without cracking and is practical to fabricate.
Choose Hardox® 450 Plate When:
Abrasion is a major concern; the equipment runs continuously in harsh conditions, and lowering maintenance frequency is important. The higher hardness slows wear and reduces replacement costs over time.
Benefits of Selecting the Right Hardox® Grade
Choosing the correct Hardox® grade matters more than simply selecting the harder plate. Using Hardox® 450 where Hardox® 400 is sufficient increases cost unnecessarily, while using Hardox® 400 for high‑abrasion areas where Hardox® 450 is needed shortens service life.
When the grade matches the application, parts last longer, fewer replacements, and the equipment runs reliably. Overall cost depends on more than plate price; labour, downtime and replacement parts also matter. A well‑matched grade controls all these costs.
Conclusion
Hardox® 400 is suited to applications with mixed wear, impact, and fabrication needs. Hardox® 450 is better for severe abrasion where long service life and low maintenance are priorities.
For the right choice, consult a trusted Hardox® Plate supplier to review your requirements, certifications, and availability.
