Duroxite® 300

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    General Product Description

    Duroxite® 300 is an iron-based steel alloy overlay deposited on a mild steel backing plate. It is designed for extremely severe sliding wear for both dry and wet (slurry) abrasive environments. It works well at ambient or elevated temperatures up to 1100°F (600°C). The product is available in single and double layers.

    Duroxite® 300 consists of specially formulated abrasive materials employing a uniform glass-forming melt chemistry that allows high undercooling to be achieved. The overlay contains a unique high volume of ultra-fine tungsten-niobium-molybdenum-rich complex borocarbides with a grain size refined down to 500 nm. The borocarbides are completely wetted in a ductile matrix preventing premature pull-out delamination, crack nucleation and bridging. This results in a product with significantly improved service life that maintains high toughness in severe sliding wear applications. Duroxite® 300 is an excellent alternative to tungsten carbide overlay.

    Key Benefits

    • Extreme wear resistance in dry and wet abrasive environments with a high degree of toughness.
    • Cost effective alternative to tungsten carbide with equivalent service life and better impact resistance.
    • Overlay thickness is reduced compared to traditional overlays resulting in a lighter weight product while increasing service life.
    • Absorbs 25% more impact energy than the traditional chromium overlay plate as measured by the continuous high impact lab test.
    • Has uniform through-thickness hardness of 67 to 70 HRC for single and multiple-layer overlay. Maintains a high hardness of approximately 60 HRC after exposure to high temperatures up to 1100°F (600°C).
    • Maintains a consistent wear resistance from surface down to 75% of the overlay.

    Typical Applications

    Duroxite® 300 is suitable for use in the mining, cement, oil sands, steel production, power generation, agriculture, oil and gas and construction. Below are some typical applications:

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      Mining Screen plates, loader bucket liners, feeding systems for ball mills, loader bucket liners, bucket lip shrouds, bucket side shrouds, chutes, liner plates and skip liners
      Cement Cement furnace components, sinter plant parts, fan blades, mixer blades, crews, gyratory mantles, coal and cement pulverizer rolls, raw material crushing components, molding panels
      Oil sands Surge bins, Feed chutes, Slurry pipes, Slurry pumps
      Steel Ore chutes
      Power Screw augers, Wear liner plates, Ash handling equipment liners
      Agriculture Grain shredding hammers, Sugar mill knives, Row crop sweeps
      Oil and Gas Fracking blender pumps
      Construction Snow plow shoes, Demolition tools
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        Mining
        Screen plates, loader bucket liners, feeding systems for ball mills, loader bucket liners, bucket lip shrouds, bucket side shrouds, chutes, liner plates and skip liners
        Cement
        Cement furnace components, sinter plant parts, fan blades, mixer blades, crews, gyratory mantles, coal and cement pulverizer rolls, raw material crushing components, molding panels
        Oil sands
        Surge bins, Feed chutes, Slurry pipes, Slurry pumps
        Steel
        Ore chutes
        Power
        Screw augers, Wear liner plates, Ash handling equipment liners
        Agriculture
        Grain shredding hammers, Sugar mill knives, Row crop sweeps
        Oil and Gas
        Fracking blender pumps
        Construction
        Snow plow shoes, Demolition tools

        For more information on applications see the Duroxite® Product brochure.

        Available Dimensions

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          Standard overlay thicknesses
          Single pass
          Double passes
          Metric unit Metric unit
          3 mm on 6 mm 6 mm on 6 mm
          6 mm on 8 mm
          6 mm on 10 mm
          6 mm on 12 mm
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            Standard overlay thicknesses

            Single pass

            Metric unit
            3 mm on 6 mm
            Standard overlay thicknesses

            Double passes

            Metric unit
            6 mm on 6 mm
            Standard overlay thicknesses

            Single pass

            Metric unit
            Standard overlay thicknesses

            Double passes

            Metric unit
            6 mm on 8 mm
            Standard overlay thicknesses

            Single pass

            Metric unit
            Standard overlay thicknesses

            Double passes

            Metric unit
            6 mm on 10 mm
            Standard overlay thicknesses

            Single pass

            Metric unit
            Standard overlay thicknesses

            Double passes

            Metric unit
            6 mm on 12 mm

            Other plate sizes and custom thicknesses can be produced upon request.

            Standard plate sizes

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              Metric unit Imperial unit
              1.2 m x 2.4 m 4" x 8"
              1.5 m x 3.0 m 5" x 10"
              1.8 m x 3.0 m 6" x 10"
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                Metric unit
                1.2 m x 2.4 m
                Imperial unit
                4" x 8"
                Metric unit
                1.5 m x 3.0 m
                Imperial unit
                5" x 10"
                Metric unit
                1.8 m x 3.0 m
                Imperial unit
                6" x 10"

                Other plate sizes and custom thicknesses can be produced upon request.

                Mechanical Properties

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                  Wear properties
                  ASTM G65 – Procedure A weight loss 2)
                  Number of overlay passes Typical surface hardness1)

                  (HRC)
                  Typical surface hardness1)

                  (HV)
                  Surface
                  (g max)
                  75 % depth of overlay 3)
                  (g max)
                  Single pass 67 - 70 925 - 1075 0.10 0.10
                  Double passes 67 - 70 925 - 1075 0.07 0.07
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                    1) Surface hardness is measured on machined flat surface just below overlay surface.

                    2) ASTM G65 - Procedure A weight loss, is a standard test measuring sliding abrasion resistance using a dry sand/rubber wheel apparatus. ASTM G65-Procedure A is the most severe test method.

                    3) ASTM G65 - Procedure A weight loss, wear test is conducted at 75% depth of the overlay materials to ensure consistently good wear resistance from the top surface through to the depth of 75% of the overlay.

                    Microstructure

                    Duroxite® 300 overlay contains an ultra-fine complex borocarbide phase down to approximately 500 nm in a ductile matrix. The typical volume fraction of borocarbides is maintained between 60 to 70% to form a uniform hard matrix. The SEM (Scanning Electron Microscopy) / EDS (Energy Dispersive Spectrometry) analysis of the Duroxite® 300 overlay confirms that the refined borocarbides are tungsten-niobium-molybdenum-rich borocarbides, and chromium-rich borocarbides dispersed in an iron- based matrix. The ultra-fine borocarbides are approximately 200 times finer than the traditional chromium carbides.

                    Tolerances

                    Thickness

                    Overall and overlay thickness tolerances can be guaranteed within ±10% of specified thickness.

                    Flatness

                    Plate flatness tolerance can be guaranteed within ±3 mm (±1/8”) over 1.5 m (5’) plate length for plate dimensions equal to or less than 1.5 m (5’) x 3.0 m (10’). For plates greater than 1.5 m (5’) wide by 3.0 m (10’) long, the plate flatness tolerance can be guaranteed within ±25 mm (±1”).

                    Delivery Conditions

                    Duroxite® 300 is supplied in an as-welded condition.

                    Fabrication and Other Recommendations

                    Welding, cutting, forming and machining

                    Recommendations can be found in the Duroxite® Products brochure, or consult your local technical support representative.

                    Safety precautions

                    When welding or cutting Duroxite® products, smoke is produced containing harmful fumes and gases that are chemically highly complex and difficult to easily classify. The major toxic component in the fumes and gases produced in the process is hexavalent chromium. The proper exhaust ventilation equipment and fume-extraction torches are recommended, as well as suitable protective clothing and respiratory protection for operators.