Hardox® HiAce for high temperatures
Hardox® HiAce is a corrosion-resistant, high-heat grade of Hardox® wear plate. It provides a cost-efficient solution for wear resistance at high temperatures up to at least 400 °C (752 °F) with a nominal hardness of 450 HBW. When traditional quenched and tempered wear-resistant steels lose hardness at higher temperatures, Hardox® HiAce steel maintains its hardness and high wear resistance.
A high-temp metal that resists abrasion and corrosion
Many industrial applications combine three major challenges: abrasive materials, elevated temperatures and corrosive environments. Hardox® HiAce steel is specifically designed to handle this demanding combination.
If you need to build heavy equipment that has to resist wear while operating at high temperatures, Hardox® HiAce provides a durable solution. While traditional quenched and tempered steels experience significant hardness loss at temperatures of 300-500 °C (about 570-930 °F), this high temp metal maintains its strength and hardness to help extend the service life of costly equipment.
At the same time, Hardox® HiAce offers corrosion resistance that helps protect components exposed to aggressive process environments. This makes it ideal for applications where hot materials, wear and chemical attack occur at the same time.
The outstanding performance of this heat-resistant steel is achieved through high-quality raw materials combined with a carefully controlled manufacturing process. And in your workshop, Hardox® HiAce can be cut, welded, machined and cold formed using the same equipment as other Hardox® grades and conventional AR steel.
A heat resistant steel for a wide variety of uses
Abrasive and hot materials – such as asphalt, foundry sand and cement clinker – place extreme demands on industrial equipment and truck bodies. In truck bodies that handle hot bulk materials, Hardox® HiAce allows for thinner plates in the floor and sides, which increases payload capacity while maintaining durability. Plus, the reduced weight also lowers the overall weight of the truck when travelling empty.
In coking plant equipment, Hardox® HiAce provides a cost-effective, long-lasting steel solution in:
- Coke ramps
- Quenching wagons
- Cooling beds
- Tippers
- Furnace inlet scrapers
- Other heat-affected equipment in process industries.
In short, Hardox® HiAce makes a strong choice wherever high wear resistance and structural strength are needed in high-temperature environments.
Get free technical adviceHardox® HiAce reduces maintenance intervals from months to years at coke plant
When red-hot coke from furnaces is discharged onto sliding ramps, the ramp liners face extremely demanding conditions. In addition to high temperatures and heavy abrasion, coke can also be mildly to moderately corrosive.
By replacing thick ceramic tiles – which are expensive and prone to cracking – with steel plates made from Hardox® HiAce, SSAB’s plant in Sweden was able to drastically reduce maintenance requirements while improving operational safety.
The result: lower maintenance costs, fewer shutdowns and a safer working environment.
The high-temp steel for demanding industrial applications
Hardox® HiAce is well suited for applications involving moderate abrasive wear, high temperatures and corrosive conditions, especially in industries like steel, cement, asphalt, power generation and recycling.
Typical applications for this high temp steel include:
- Dryer drums and lifter plates inside dryers in asphalt plants
- Clinker cooler plates and other liner plates in cement plants
- Blast furnace components and slag buckets in steel plants
- Rotary seal valves in coke plants
- Ash handling equipment and chain conveyers in power plants
- Scrapers, screeners and liner plates in foundries
- Liner plates, crusher hammers for gypsum and clinker
Heat-resistant ceramics vs. our high-temperature steel
In some high-temperature environments, materials like ceramics or mild steel are used to resist wear. But these solutions often come with limitations.
For example, coke ramps made in thick basalt ceramic tiles can be incredibly expensive and are prone to cracking. This leads to frequent maintenance stops and money-wasting downtime.
Hardox® HiAce offers a durable alternative. It provides high wear resistance, good structural strength and lower weight, while also being easier to fabricate and install. Because of its workshop-friendly properties, you can cut, weld and form it using conventional equipment, making installation faster and more efficient than many ceramic solutions.
Benefits of Hardox® HiAce heat-resistant steel
- Corrosion-resistance helps extend service life in aggressive environments and reduce maintenance requirements
- High toughness makes it suitable for rapid temperatures changes or freezing conditions without cracking
- Resists deformation, buckling and cracking at elevated temperatures
- Allows thinner plates for lower equipment weight, higher payload capacity and prolonged service life
- Easily cold formed using conventional methods
- Helps reduce maintenance, downtime and operating costs while improving safety
- Can be cut, welded and machined using the same equipment as other Hardox® grades and conventional AR steel.
Made for predictable workshop performance
Welding
Hardox® wear plate combines exceptional performance with excellent weldability. Conventional welding methods can be used to weld to other weldable steels. Our welding recommendations cover heat input, preheating, input, preheating, consumables and procedures for reliable welds and optimal steel performance.
Welding recommendations for Hardox® HiAce
Drilling and machining
Hardox® wear plate can be machined using high-speed steel (HSS) or cemented carbide (CC) tools. Our machining guide provides recommended tooling, cutting data (feeds and speeds) and practical tips to help you achieve efficient machining and good tool life.
Drilling and machining guidelines for Hardox® HiAce
Bending
Hardox® wear plate combines high strength with reliable formability. Our bending guide includes practical recommendations for achieving the best results when bending, including on plate thickness, steel grade, and bending direction relative to the rolling direction. This helps ensure consistent press-brake performance.
Bending recommendations for Hardox® HiAce
Cutting
Hardox® wear plate can be cut using both thermal methods (plasma, laser, oxy-fuel) and cold-cutting methods (abrasive waterjet, sawing). Our cutting recommendations help you select the right cutting method and parameters to achieve clean cut edges and stable production.
Cutting Hardox® HiAce
Hardox® guarantees
Hardox® guarantees include tight thickness tolerances, tight flatness tolerances, and tight bending guarantees. These guarantees complement the Hardox® datasheets and reinforce our commitment to predictable workshop performance.
Review the Hardox® Guarantees
Tech support
Hardox® steel is more than a wear plate – it comes with the technical expertise to help you get the most out of it. Our specialists provide practical guidance on welding, bending, drilling and machining so you can fabricate with confidence from workshop to final application.
Contact technical support
Did you know?
Hardox® HiAce is also the best steel against corrosive wear
Discover moreDimension Range
Hardox® HiAce plate is available in thicknesses of 4.0 - 100.0 mm, and Hardox® HiAce sheet in thicknesses of 3.0 - 4.0 mm. Hardox® HiAce plate is available in widths up to 3350 mm and lengths up to 14630 mm. Hardox® HiAce sheet is available in widths up to 1600 mm and lengths up to 16000 mm. More detailed information on dimensions is provided in the dimension program.
Mechanical Properties
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1) Brinell hardness, HBW, according to EN ISO 6506-1, on a milled surface 0.5 – 3 mm below surface. At least one test specimen per heat and 40 tons. The nominal thickness of supplied plates will not deviate more than +/- 15 mm from the thickness of the test specimen used for hardness testing. For sheet the Brinell hardness test is according to EN ISO 6506-1 on each heat treatment individual/coil. Hardness is measured on a milled surface 0.3 - 2 mm below surface.
Hardox® wear plate is through-hardened. Minimum core hardness is 90 % of the guaranteed minimum hardness.
Impact Properties
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Charpy V 10x10 mm test specimen 1)
1) Impact testing is performed on thicknesses ≥ 6 mm for plate and ≥ 3 mm for sheet. For thicknesses between 3 and 11.9 mm, sub-size Charpy V-specimens are used. The specified minimum value is proportional to the cross-sectional area of the test specimen, compared to a full-size specimen (10 x 10 mm). Impact testing according to ISO EN 148 per heat and thickness group. Average of three tests.
2) Single value minimum 70% of specified average.
Chemical Composition (heat analysis)
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The steel is grain refined. *) Intentional alloying elements.
Carbon Equivalent CET(CEV)
Thickness
Tolerances according to Hardox® Thickness Guarantee.
Hardox® Guarantees meet the requirements of EN 10029 Class A for plate, but offer more narrow tolerances. For sheets the guarantees meets the requirements of 1/2 EN 10051.
Length and Width
According to SSAB’s dimension program. For plate, the tolerances are according to SSAB´s mill edge standard or tolerances that conform to EN 10029. For sheet the tolerances conform to EN 10051, tighter tolerances available on request.
Shape
Tolerances according to EN 10029 for plate and according to EN 10051 for sheet.
Flatness
For plate the tolerances are according to Hardox® Flatness Guarantees Class C, which are more restrictive than EN 10029 Class N. For sheets the tolerances are according to Hardox® flatness guarantees Class A, which are more restrictive than EN 10051.
Surface Properties
According to EN 10163-2 Class A, Subclass 1.
Delivery Conditions
The delivery condition is Quenched or Quenched and Tempered. Plates are delivered with sheared or thermally cut edges and thicknesses over 80 mm are delivered with mill edge as standard. Sheets are delivered with an as-rolled surface and mill edge as standard.
Fabrication and Other Recommendations
Welding, bending and machining
Recommendations can be found in SSABs brochures at www.hardox.com or consult Tech Support.
Bendability for plate are according to Hardox® Bending Guarantees Class E. For sheet, the bendability are according to Hardox® Bending Guarantees Class A.
Hardox® HiAce often retains ≥90% of the guaranteed minimum hardness when exposed to temperatures up to 400 °C. Please note that exposure to elevated temperatures at and below this limit may still degrade the mechanical properties over time, retention of the delivery condition is not guaranteed.
Contact SSAB for further discussion.
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.