VRN 600 Overlay Plate
VRN 600 is an iron-chromium-carbide alloy which has been fused onto a mild steel backing plate.  The ultra-hard chromium carbide particles are suspended in a hard, tough matrix, a combination which offers optimum abrasion resistance.  The mild steel backing material allows VRN 600 to be rolled, bent, formed and fabricated into a multitude of abrasion-resistant applications.

Appearance
During the overlay process, the stresses present due to expansion and contraction are relieved by cracking of the hard surface deposit.  Crack frequencies of more than one crack per 25 mm are desirable and indicate that here is no simultaneous cracking away of the hard layer from the mild steel base.

Wear Life
Data obtained from in-service indicate that VRN 600 overlay plate will substantially outlast conventional liner materials in high abrasion, medium impact and high temperature applications.  

TECHNICAL SPECIFICATIONS.

Minimum hardness                            550 B.H.N.
Average S.G.                                     7.9
Backing plate                                     Structural steel
Standard bead width of overlay       28 mm
Overlay thickness                               3.2 mm - 10 mm
Backing plate thickness                    5 mm - 20 mm
Maximum operating temperature     680^oC (sustained)
Plate size (Max)                                  2 900 mm x 2 200 mm

Fabricating
VRN 600 may be cut, formed and rolled to a variety of shapes and configurations.

Cutting
Plasma arc cutting is recommended.

Welding
Backing plate can be welded with standard carbon steel electrodes.  Heat treatment is not required.  Common methods of attachment are peripheral edge welds and male/female plug welds.  Alternate methods of attachment are countersunk bolts and stud welding.

Rolling
Minimum Rolling Radius (internal) 20 x material thickness
Minimum Rolling Radius (external) 50 x material thickness

Particular attention must be paid to the overlay and base plate thickness combination. The base plate should be thicker than the overlay in order to assist forming. Contact MacsteelVRN if in doubt.   

TYPICAL APPLICATIONS.

Power
Fan Blades and liners, Classifier cones, Ash removal conveyors.  Chutes.

Paper & Pulp
Fan blades and liners, Cyclone liners, Bark chutes, Chipper Hood liners, Belt Conveyor transfer bins, Screw Conveyors, Tube turns, Transmission Sections.

Dredging
Pump Shells, Impellers, Trunnion elbows, Distribution Troughs, Rock Boxes, Drag Heads, Side liners, Ball joints, Reducers, Flap Valves.

Cement
Clinker Chutes, Hopper liners, Fan Blades and liners, Dust sections, Vibration Screen Decks, Air separator wear plates, Impact crusher liners, Grinding Ring Segments.

Refinery
Inlet cones, Flapper plates, Lift Bells, Patch Plates.

Mining
Truck Bead Wear Protective Systems, Shovel and Bucket Wear Protection Systems.  Vibrating Screen Decks, Chute liners, Fan blades, Hopper liners, Trunnion liners, Wear caps, Vibrating pans, Main Frame Crusher Liners.

Steel
Chute and Hopper liners, Fan blades and liners, Main Ram support shoes, Septum valves, Small bell and bell seats, Bucket liners, Reclaimer Buckets, Skip car plates, Scroll and cheek plates, Table wear plates, Screen Deck plates, Flapper Gates, Grizzly Bars, Plow Blades, Bell-less Furnace Distribution Chutes.  

Methods of attachment
VRN 600 clad base material can be welded with a standard carbon steel electrode;  heat treatment is not required.
Common methods of welded attachment are peripheral edge welds and  plug welds.  Alternate methods of attachment include studs and countersunk bolts.