Home / Business / Duroxite® chromium carbide overlay (CCO) products safeguard equipment against wear in severe abrasive environments.

Duroxite® chromium carbide overlay (CCO) products safeguard equipment against wear in severe abrasive environments.

The harder the abrasive material, the more Duroxite® is the solution. Duroxite® overlay products are made by welding a carbide-rich steel alloy on top of a steel plate. This compound material has very high resistance to wear, for example in sliding wear environments where small and hard materials are processed such as rocks or coal with high quartz content.

Wear protection the Duroxite® way

Duroxite® overlay products can add weeks, months, even years of trouble free operations to your most extreme wear situations. The outstanding performance of Duroxite® is the result of hard facing a metal by welding different types of chromium or complex carbides on top of the base material. By carefully composing the hard facing material, each Duroxite® product is optimized for different wear situations and abrasive materials.

Duroxite® 100 made to order

Duroxite® 100 overlay plate is available to SSAB’s customers in Sub-Saharan Africa as full-size or cut-to-order plates.

Guaranteed wear performance

Duroxite® has guarantees which are unique for the overlay market. Duroxite® plates are delivered with a carbide layer thickness guaranteed within ±10%. This is consistent throughout the plate and from plate to plate.

The high wear resistance is more than skin deep. The wear properties are guaranteed throughout the plate down to 75% of the carbide layer thickness as opposed to just the surface of the layer. The remaining 25% is the transition layer necessary to maintain good bonding to the base plate.

Applications where Duroxite® improves service life and reduces maintenance

Duroxite® products are used in all types of wear-challenged industries, ensuring high productivity and uptime. These are some examples of common applications:

  • Chutes and hoppers, liners for truck beds, dozer blades, shovel buckets, dragline buckets and excavators in quarrying and mining operations
  • Guide vanes, hoppers, discharge cones for clinker storage bins, chutes and outlet ducts for clinker grinding mills in cement production
  • Fan blades and housings and coke vibrating screen plates in the steel industry
  • Coal handling chutes, coal feeder liners, crusher screen plates, classifier cones, journal liners and silo bunkers in power plants.

The way of welding overlay products

The hard facing layer is welded on a steel base plate. The base plate in Duroxite® overlays is either mild steel or Hardox® wear plate for additional strength and durability. Duroxite® 101 and Duroxite® 201 both have Hardox® as base plate.

The staggered cracking pattern

When the welds cool, a pattern of fine cracks perpendicular to the welding direction is created. These cracks are intended and don’t affect the plates wear resistance. They allow the plate to be roll formed into a curved shape, usually with the hard facing layer on the inside, although it can also be on the outside. Overlay plates should not be bent parallel to the welding strands.

Chromium or complex carbides can also be deposited with specially formulated welding wires and stick electrodes. This is commonly used for repair and maintenance, or for producing wear parts such as recycling hammers and teeth for excavator buckets.

Contact SSAB South Africa on: info.za@ssab.com

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