DOMITE^{® __} LAMINATED WEAR PLATE ^___from: Domite Wear Technology Inc.

Specifications

Domite^® Laminated Wear Plate is a unique material combining the wear resistant capability of a chromium/molybdenum white iron with the ductility, toughness and weldability of mild steel. This is achieved by metallurgically bonding the white iron to a mild steel backing plate. The cast white iron conforms to ASTM A 532 Class II Type B. This material is hard, exhibiting very little ductility, so tensile and impact tests are not included in this specification. This material is normally specified to a hardness criteria. It responds to heat treatment and can be through hardened to a minimum 656 HB or softened to 400 HB for machining and then rehardened.
The as cast, heat treated microstructure is uniform throughout with discrete vs. interconnected carbides. It is magnetic.

What you need to know to order Domite^® Laminated Wear Plates

^{- The thickness of the wear material. Typically this will be at least 3/8"( 9.5 mm) and up to 2" (50 mm). This can be a function of the service life desired.}

^{- The "rule of thumb" for the ratio of wear material thickness to backing plate thickness is 3:1.}

^{- Backing plate thickness can be from 1/8" (3 mm) and up. Where a thicker backing plate is needed to allow say, tapped holes
  or a cast backing is required to permit fastening of liner plates to existing rails, a detailed sketch is required.}

^{- You need to decide on the overall dimensions for each tile and whether they include an extended backing plate on one or more edges to facilitate welding.
  This weld lip is usually a 3/16" (5 mm) extension. The overall dimensions are governed by casting thickness because of the need to feed the white iron section.}

^{- For thickness under 1/2" consult your foundry representative. For 3/4" or more a good ecomomical size is 11 " (280 mm) x 12" ( 300 mm) including the weld lip   extension. Maximum size is approximately 12" or (300 mm) x 17" (430 mm) and this is dictated by the physical dimensions of the controlled atmosphere furnace   and the constraints of achieving a proper bond.}

^{* Note: - Refer to the pages on versatility and flexibility for examples of shapes and methods of fastening. Domite is usually cast to shape to fit any angles and edges.
             In order to achieve the metallurgical bond, the joining faces of the Domite® and backing plate or casting must be in a flat plane.}

Charpy Impact Tests (room temperature) Using standard un-notched charpy impact specimen 0.707" square.

Cast and heat treated white iron 11 ft. lbs.
Tests done on Domite^® Laminated Wear Plate,
White Iron laminated to mild steel ( 3 to 1 thickness ratio ) 91 ft. lbs.
White Iron laminated to mild steel ( 5 to 1 thickness ratio ) 42 ft. lbs.

Flatness
  In practice, Domite^® Laminated Wear Plate is pulled flush with chute or hopper walls when it is installed by welding the mild steel backing plate to the walls. This can result in fine hairline cracks in the cast white iron wear surface which is normal. Cracks will also occur in service due to impact and because the white iron does not separate from the backing plate, the integrity of the Domite^® wear surface is maintained.
  Domite^® Laminated Wear Plate is composed of two materials with different thermal conductivity, thermal heat transfer coefficient and phase transformation properties so there is thermal stress introduced into the composite during manufacture. Heating and cooling must be closely controlled to achieve a sound metallurgical bond.
At the processing temperatures, the strength of both materials is low and some bending may occur. When received, Domite^® may have a small convex curvature on the backing plate side. This can be straightened without affecting service life.

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