ENDURA Cr (CHROMIUM CARBIDE OVERLAY)

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 of ENDURA Cr (Chromium Carbide Overlay)

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

Microstructure of ENDURA Cr (Chromium Carbide Overlay)

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 for ENDURA Cr (Chromium Carbide Overlay)

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

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

Power

Coal discharger chutes

Dimensions

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

Surface Hardness

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.

Wear Properties

Number of overlay passes	ASTM G65 – Procedure A weight loss*
Number of overlay passes	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.

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 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 chromium carbide 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

Cutting

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.

Forming

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

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
Plate thickness	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

Contact Us Today to Explore Applications for ENDURA Cr (Chromium Carbide Overlay)

Titus Steel products and solutions enable our customers to reduce downtime, increase payload and protect their employees. Let us help you overcome your steel challenges.

Fill in the form below, and our Sales Representative will be in touch.

Chromium Carbide Overlay for Severe Wear & Impact Applications