(a) The tensile strength and percentage elongation shall
be determined from test pieces of gauge lengths preferably
equal to Lo=5.6(Ao)1/2 (see
regulation 16). Alternatively, other gauge lengths
may be used, provided the elongation is expressed as the equivalent
value on a gauge length of 5.65(Ao)1/2.
(b) In arbitration cases, a test piece of gauge length equal
to 5.65(Ao)1/2 for rectangular test piece or 5
do for round
test pieces shall be used. For plate thickness exceeding 60mm,
test pieces shall be taken from the exterior third of the
plate cross section. Wherever practicable, the rolled surface
shall be retained on two opposite sides of the test piece.