Hardox® 550
Hardox® 550, with a nominal hardness of 550 HBW, offers a unique combination of excellent abrasion resistance, crack integrity and workshop performance. Hard and tough, it helps to extend the service life of wear parts in heavy-duty and high wear applications.
Hardox® 550 steel with high hardness and toughness
Hardox® 550 is specially designed for heavy wear applications and makes a great alternative to 12% manganese steel castings, 500 Brinell wear plate or bimetals. The additional 50 Brinell you gain in hardness, when upgrading from conventional 500 HBW steels, will increase wear life, though not at the expense of crack integrity. Hardox® 550 is typically used for wear parts in industries like mining, quarrying, mineral processing, earthmoving and recycling.
Why Hardox® 550?
- Makes a great alternative to grades with a lower hardness, conventional 500 Brinell steel plate, manganese steel castings or bimetals
- Risks of cracking minimized thanks to its high toughness and excellent surface finish
- Get up to 60% longer service life than with conventional 500 HBW plate, while maintaining crack integrity
- Longer service intervals lead to lower maintenance costs and higher productivity
- Shorter delivery time compared to manganese steel castings
- Get thinner yet higher-performing wear liner packages in truck bodies for lower overall vehicle weight and higher payload
- Workshop benefits: Comes already through-hardened, is machineable and weldable, exceptionally clean steel with guaranteed properties
Hardox® 550 steel with high hardness and toughness
- Wear liners, tailgate liners, liners for apron feeders, crushers, squirt plates, transfer chutes, skip bars, grizzly bars and excavation bucket pads, cutting edges, wear bars, lip shrouds in mining, quarrying and earthmoving.
- Industrial process equipment such as crusher knives, hammers, discs, wedges, shredder rotors, chute liners and hopper liners, ball and SAG mill liners, bolt-on cutting edges, shrouds, vertical and horizontal shaft impactors and gravel washer wear parts.
- Liner plates and other wear parts and components in cement, concrete, steel and energy plants.
- Harvester guide bars in forestry.
Shredder knives and hammers in recycling
Shredder knives in 25 mm (0.984”) thick Hardox® 550 were cut with abrasive water jet cutting. When replacing AR500 steel, it typically leads to an increase in service life of 30%.
Jaw crusher cheek plates in quarries and mineral processing
Cheek plates for the jaw crusher in a granite quarry are made of Hardox® 550. They replaced 12% Mn steel and increased service life by 70%.
Liners for buckets
A complete liner package of Hardox® 550 for a bucket in a copper mine increased service life by 25%, compared to an AR500 steel.
Screens
Clinker screens in Hardox® 550 in a cement plant increased service life by 40%, compared to an AR450 steel.
Hardox® WearCalc
The Hardox® WearCalc app is an easy tool to see how much longer service life Hardox® 550 can provide. The chart shows relative wear life with Hardox® WearCalc and magnetite-based iron ore.
Hardox® 550 can give equipment an extra 60% longer service life compared to a 500 HBW AR plate, depending on the application. Not only will the equipment last longer, but the narrow hardness interval of 525-575 HBW gives a consistent wear life, enabling more precise maintenance planning.
Why Hardox® 550 outperforms parts in manganese steel
Hardox® 550 is a genuine alternative to wear parts made of manganese steel. Manganese steel rarely reaches 550 HBW. And if it does, it happens only when exposed to extreme impact wear. For sliding wear, it usually stays at a moderate hardness of 400-450 HBW. Hardox® 550 always performs at typically 550 HBW — no matter the type of wear — so your wear parts will last longer. Unlike cast manganese wear parts, you can machine and weld Hardox® 550, making it easy to produce custom wear parts in standard machines and workshop setups.
Upgrading to Hardox® 550 is simple
Users of standard 500 HBW AR plate or Hardox® 500 don’t want to give up toughness or workability for an extra 50 HBW. We developed Hardox® 550 with precisely this in mind. Upgrading to Hardox® 550 is a simple and straightforward process. You get the additional hardness, and the steel is still easy to process in the workshop thanks to its high toughness. You can do the upgrade with practically no changes to your designs or workshop routines. You can weld and machine this steel using the same machinery as for a 500 HBW steel.
Dimension Range
Hardox® 550 is supplied in plate thickness of 8.0 – 65 mm, up to 2900 mm in width and up to 14630 mm in length. More detailed information on dimensions is provided in the dimension program.
Mechanical Properties
Product | Thickness (mm) | Hardness 1) (HBW) |
|---|---|---|
Hardox® 550 plate | 8.0 – 65.0 | 525 – 575 |
1) Brinell hardness, HBW, according to EN ISO 6506-1, on a milled surface 0.5 – 3 mm below surface for plate. At least one test specimen per heat and 40 tons.
The nominal material thickness will not deviate more than ± 15 mm from that of the test specimen.
Hardox® wear plate is through-hardened. Minimum core hardness is 90 % of the guaranteed minimum hardness.
Impact Properties
1) Impact toughness measured upon agreement. Impact testing according to ISO EN 148 per heat and thickness group. Average of three test.
2) Typical value for 20 mm.
Product | Longitudinal test, typical impact energy, Charpy V 10×10 mm test specimen 1) |
|---|---|
Hardox® 550 plate | 30 J / -40 °C 2) |
Chemical Composition (heat analysis)
C *) (max %) | Si *) (max %) | Mn*) (max %) | P (max %) | S (max %) | Cr*) (max %) | Ni*) (max %) | Mo*) (max %) | B*) (max %) |
|---|---|---|---|---|---|---|---|---|
0.44 | 0.50 | 1.30 | 0.020 | 0.010 | 1.40 | 1.40 | 0.60 | 0.004 |
Carbon Equivalent CET(CEV)
Product type | Plate | Plate | Plate |
|---|---|---|---|
Thickness (mm) | 8.0 – 31.9 | 32.0 – 51.0 | 51.1 – 65.0 |
Max CET(CEV) | 0.49 (0.70) | 0.52 (0.75) | 0.61 (0.82) |
Typ CET(CEV) | 0.46 (0.67) | 0.49 (0.72) | 0.58 (0.79) |
Our Vision
To establish Sai Steel as a globally recognized, tender-ready manufacturing hub for custom fabrication, industrial components, and engineered structures. Through continuous investment in technology, export infrastructure and partnerships, we aim to lead in quality, precision and service excellence across continents.
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