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ENDURA Cr

ENDURA Cr is developed for severe wear and impact applications applying specially formulated abrasive materials on AR 450 backing plate. The overlay material is composed of primary chromium-rich carbides and refined multiple-alloy complex carbides dispersed evenly in a ductile eutectic austenite matrix. The additional multi-alloy carbides are harder and finer than the co-existing chromium-rich carbides which interlock between large primary chromium-rich carbides in a matrix.

  • 700 BHN (65 HRC)
  • Formable
  • 450 AR backing plate for added wear life
  • Elevated temperatures (660 F)

Key Benefits

  • AR 450 backing withstands plastic deformation better due to its high yield strength flexing back after impact
  • Provides stronger support due to high hardness and better bonding properties between overlay and base steel
  • Good performance for impact situations at elevated temperatures up to 350° C (660° F), best impact resistance is at room temperature.

Microstructure

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

Dimensions

Overlay Thickness

Metric UnitImperial Unit
6 mm on 6 mm1/4″ on 1/4″
10 mm on 10 mm3/8″ on 3/8″
6 mm on 20 mm1/4″ on 3/4″
6 mm on 25 mm1/4″ on 1″
6 mm on 32 mm1/4″ on 1-1/4″

Plate Sizes

Metric UnitImperial Unit
1.2 m x 2.4 m4′ x 8′
1.5 m x 3.0 m5′ x 10′
1.8 m x 3.0 m6′ x 10′

Mechanical Properties

Number of overlay passesTypical surface hardness*
Multiple passes60 to 65 HRC (700 to 850 HV)

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

Number of overlay passesASTM G65 – Procedure A weight loss*
Surface75% depth of overlay**
Multiple passes0.12 g maximum0.12 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

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 thicknessFlatness tolerance
Metric unitImperial unitMetric unitImperial unit
6 mm on 6 mm1/4″ on 1/4″25 mm1″
10 mm on 10 mm3/8″ on 3/8″12 mm1/2″
12 mm on 12 mm1/2″ on 1/2″6 mm1/4″
6 mm on 20 mm1/4″ on 3/4″6 mm1/4″
6 mm on 25 mm1/4″ on 1″6 mm1/4″
6 mm on 32 mm1/4″ on 1-1/4″6 mm1/4″

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

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 onventional 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 thicknessCarbon steel
130 amps200 amps260 amps400 amps360 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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