Chrome Carbide Overlay with ENDURA (550 BHN) Backing Plate

ENDURA Cr has been developed for unique and severe wear and impact applications. The chromium carbide overlay (CCO) has a surface hardness of 700-850 BHN depending on the number of passes. As the “overlay” surface is worn away, the ENDURA backer plate “Work Hardens” to 540-560, providing extra service life.

Key Benefits

  • ENDURA backing plate with 550 BHN, leads to extra service life
  • ENDURA Cr withstands deformation better than regular chromium carbide overlay (CCO) plate due to ENDURA’s homogeneous micro structure and TRIP effect (transformation induced by plasticity)
  • ENDURA’s high yield (195 ksi) and tensile strength (240 ksi) leads to less cracking
  • Outstanding performance at elevated temperatures of 350°C (660°F)
  • Can be formed, welded and machined


The microstructure of ENDURA Cr contains primary chromium-rich carbides and refined multiple-alloy complex carbides with a typical hardness of 2500 to 3000 HK4) dispersed evenly in a ductile eutectic austenite matrix. The typical volume fraction of primary chromium-rich carbides is maintained between 30 to 40% with 7 to 10% of multi-alloy complex carbides.

Typical Applications

ENDURA Cr is widely used in many industries including mining, cement and power generation. Some specific applications include:

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 furnace components, sinter plant parts, fan blades, mixer blades, crews, gyratory mantles, coal and cement pulverizer rolls, raw material crushing components, molding panels

Coal discharger chutes


Overlay Thickness

Metric Unit Imperial Unit
6 mm on 6 mm 1/4″ on 1/4″
10 mm on 10 mm 3/8″ on 3/8″
6 mm on 20 mm 1/4″ on 3/4″
6 mm on 25 mm 1/4″ on 1″
6 mm on 32 mm 1/4″ on 1-1/4″

Plate Sizes

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′

Mechanical Properties

Number of overlay passes Typical surface hardness*
Multiple passes 60 to 65 HRC (700 to 850 HV)

* Surface hardness is measured on machined flat surface just below overlay surface.

Number of overlay passes ASTM G65 – Procedure A weight loss*
Surface 75% depth of overlay**
Multiple passes 0.12 g maximum 0.12 g maximum

* ASTM G65 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.
** ASTM G65 wear test is conducted at 75% depth of the overlay materials to ensure consistently good wear resistance from top surface through to the depth of 75% of the overlay.


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

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 following flatness guarantees apply.

Standard overlay thickness Flatness tolerance
Metric unit Imperial unit Metric unit Imperial unit
6 mm on 6 mm 1/4″ on 1/4″ 25 mm 1″
10 mm on 10 mm 3/8″ on 3/8″ 12 mm 1/2″
12 mm on 12 mm 1/2″ on 1/2″ 6 mm 1/4″
6 mm on 20 mm 1/4″ on 3/4″ 6 mm 1/4″
6 mm on 25 mm 1/4″ on 1″ 6 mm 1/4″
6 mm on 32 mm 1/4″ on 1-1/4″ 6 mm 1/4″

Installing ENDURA Cr

No special equipment is needed to install ENDURA Cr products. Welding and bolting are the common methods for installing ENDURA Cr overlay plate or wear parts onto your equipment.

When joining base metal, use 480 MPa (70 ksi) or 560 MPa (80 ksi) consumables. Any surface exposed to severe wear should be protected with hard-surfacing consumables.

Welding and Bolting to Your Substrate


ENDURA Cr can be cut by plasma, laser, water jet, arc gouge, and abrasive saw cutting. It cannot be cut by oxy-fuel flame cutting. ENDURA Cr should be cut from the base metal side only to avoid carbon contamination.

When beveling, ENDURA Cr overlay plate can be burned from the hard side. Cutting speeds need to be reduced when cutting carbides.


ENDURA Cr is typically formed with overlay to the inside but can be roll formed with overlay to the outside. Avoid bending plate parallel to the welding bead direction.

The staggered cracking pattern on the overlay surface ensures good formability when bending. For bending radius recommendations, see chart below.


Machining ENDURA Cr with conventional methods is not recommended. It can be finished by grinding.

Countersunk holes can be precisely produced by EDM (Electrical Discharge Machining). Pre-machined mild steel inserts can be used if extra machining is required.

Recommended Cutting Speed at Different Plasma Currents and Thickness

Plate thickness Carbon steel
130 amps 200 amps 260 amps 400 amps 360 amps
6 mm on 3 mm
1/8″ on 1/4″
1920 mm/min
75 inches/min
2655 mm/min
105 inches/min
3080 mm/min
120 inches/min
3540 mm/min
140 inches/min
4200 mm/min
165 inches/min
6 mm on 6 mm
1/4″ on 1/4″
1920 mm/min
75 inches/min
2655 mm/min
105 inches/min
3080 mm/min
120 inches/min
3540 mm/min
140 inches/min
4200 mm/min
165 inches/min
10 mm on 10 mm
3/8″ on 3/8″
1010 mm/min
40 inches/min
1265 mm/min
50 inches/min
1735 mm/min
65 inches/min
2440 mm/min
95 inches/min
4200 mm/min
165 inches/min
12 mm on 12 mm
1/2″ on 1/2″
552 mm/min
20 inches/min
1225 mm/min
45 inches/min
1465 mm/min
55 inches/min
1800 mm/min
70 inches/min
4200 mm/min
165 inches/min

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