Expanded metals

WAREHOUSE/DELIVERY/PRODUCTION PROGRAMME

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Expanded metal, also known as expanded grate, is defined by openings in the surface, so-called meshes that are the result of staggered cuts and simultaneous expanding deformation. They are generally diamond-shaped, round or square and neither plaited nor welded. Stretching (“cold drawing”) causes the material to exhibit significant strength and surface stability, as metals generally become brittle and become more resistant to bending. There are various types of mesh in the grates consisting of sheets or strips: diamond mesh, long-bond mesh, hexagonal mesh, round mesh and square mesh. Generally, expanded metal grates have ribbed, plastically structured surfaces, however, flat rolling of the grate is also possible. Expanded metal can achieve free cross sections between 4 and 90 percent; in contract to perforated metal sheets, however, there is no waste during production (cut punching).

SPECIFICATION EXPANDED METAL

  1. Expanded metal
  2. Width of the expanded metal: measured in the direction of the mesh’s long diagonal
  3. Length of the expanded metal: measured in the direction of the mesh’s short diagonal
  4. Mesh: Element of the expanded metal, consisting of bridges and the diamond-shaped opening enclosed by them. The size of the mesh depends on the length and width of the mesh.
  5. Mesh length: Distance from centre of the node to centre of the node in the direction of the long diagonal
  6. Mesh width: Distance from centre of the node to centre of the node in the direction of the short diagonal
  7. Mesh opening: Opening between four bridges perpendicular to the expanded metal area
  8. Bridge width: Width between the openings of the remaining material
  9. Bridge thickness: Thickness of the used material
  10. Node: Intersection between four neighbouring bridges
  11. Node length: Distance between two long diagonals
  12. Node width: Approximately twice the bridge width
  13. Expanded metal thickness: Total thickness of the expanded metal

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Expanded metal production programme

MATERIAL DESIGN

  • Steel
  • Aluminium
  • Stainless steel
  • Copper
  • Zinc
  • all punchable metals

OTHER SPECIFICATIONS

  • Formats: up to a material width of 3,200 mm
  • Mesh width: from 0.5 to 800 mm
  • Delivery deadlines: depending on the quantity, 1 – 4 weeks

EXPANDED MATERIALS STANDARDS & TOLERANCES

Standards

The term “expanded metal” (expanded grating) is defined in the standard DIN 791, BS 405, and BS 4592 part 2. Expanded metal is available in standard or flat-rolled design.

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Tolerances

MESH TOLERANCES

  • Mesh width +/- 5%
  • Bridge width +/-5%
  • Bridge thickness +/- 10%

TOLERANCES OF THE STANDARD SHEETS

  • Width tolerance +/- 5%
  • Length tolerance +/- 10%

TOLERANCES CUTTINGS

Group 1

  • Width tolerance +/- 5%
  • Length tolerance +/- 10%

Group 2 (< 2 mm thickness)

  • up to 600 mm width/length +/- 1 mm
  • up to 1000 mm width/length +/- 1.5 mm
  • above 1000 mm width/length +/- 2 mm

Group 2 (>2 mm thickness)

  • up to 600 mm width/length +/- 2 mm
  • up to 1000 mm width/length +/- 3 mm
  • above 1000 mm width/length +/- 5 mm

EVENNESS

Expanded metal is considered flat, if, when placed on an even area with the curvature facing upwards, the distance between the metal sheet and the area does not exceed 20mm (heat-resistant metal sheets 40mm).

EDGE BOWS

Expanded metal is considered even above the longitudinal edge, if the centre of the curvature does not deviate from the straight line by more than 1.5 % of the length at a sheet thickness of 3 mm, and not more than 2 % of the length at a sheet thickness of more than 3 mm.

CUTTING TYPES

The type of cut of the expanded metal (open / closed mesh per metal sheet side to be specified) must be discussed and defined in relation to the order.

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