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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.
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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.
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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%.
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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%.
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A complete liner package of Hardox® 550 for a bucket in a copper mine increased service life by 25%, compared to an AR500 steel.
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Clinker screens in Hardox® 550 in a cement plant increased service life by 40%, compared to an AR450 steel.
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.
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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.
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.
You can purchase Hardox® 550 wear steel when and where you need it, thanks to local availability on a worldwide scale. The most common Hardox® grades and dimensions can be delivered to you directly from an SSAB mill or from nearby SSAB stocks in less than 48 hours. A worldwide source for wear parts in Hardox® 550 and other Hardox® grades is Hardox® Wearparts, our network of more than 550 wear service centers.
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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 surface hardness.
The steel is grain refined. *) Intentional alloying elements.
Tolerances according to Hardox® Thickness Guarantees.
Hardox® Guarantees meet the requirements of EN 10029 Class A, but offer more narrow tolerances.
According to SSAB’s dimension program.
Tolerances according to SSAB´s mill edge standards or tolerances that conform to EN 10029.
Tolerances according to EN 10029.
Tolerances according to Hardox® Flatness Guarantees Class E, which are more restrictive than EN 10029 class N.
According to EN 10163-2 Class A, Subclass 1.
The delivery condition is Q or QT (Quenched or Quenched and Tempered). The plates are delivered with sheared or thermally cut edges. Untrimmed mill edges available by agreement.
Welding, bending and machining
Recommendations can be found in SSABs brochures at www.hardox.com or consult Tech Support.
Hardox® wear plate is not intended for further heat treatment. It has obtained its mechanical properties by quenching and when necessary by means of subsequent tempering. The properties of the delivery condition cannot be retained after exposure to temperatures in excess of 250ºC .
Appropriate health and safety precautions must be taken when welding, cutting, grinding or otherwise working on this product. Grinding, especially of primer coated plates, may produce dust with a high particle concentration.
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