AS U21-1956
[ Withdrawn ]
75 ton, 2 1/2 per cent nickel-chromium-molybdenum steel (high-carbon) (limiting ruling section 6 in.)
standard by Standards Australia, 01/01/1956
AS U24-1956
[ Withdrawn ]
100 ton, 2 1/2 per cent nickel-chromium-molybdenum steel (oil-hardening) (limiting ruling section 2 1/2 in.)
standard by Standards Australia, 01/01/1956