Chromium Carbide Overlay for Severe Wear & Impact Applications

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.

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

Overlay Thickness

Plate Sizes

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.