A sheet of expanded metal produced by slitting a sheet of metal, and
stretching along a stretching direction, which sheet of expanded metal
forms a grid of openings having a first repetition length in the
stretching direction and a second repetition length in the direction
perpendicular to the stretching direction, wherein the first and second
repetition lengths are substantially equal. A sheet of expanded metal
having a stretching angle larger than 90 degrees. Use of a sheet of
expanded metal according to the invention for supporting a bundle of
parallel tubes. A method of manufacturing expanded metal from
pre-expanded metal, wherein expansion force is applied at a plurality of
points perpendicular to the stretching direction, wherein the expansion
force is applied using a plurality of force transmitters co-operating
with the plurality of points, and wherein the force transmitters are
arranged so that they can move towards each other in the second direction
while applying extension force.